702 results on '"Otto‐Bliesner, Bette L."'
Search Results
102. The role of meltwater-induced subsurface ocean warming in regulating the Atlantic meridional overturning in glacial climate simulations
- Author
-
Brady, Esther C. and Otto-Bliesner, Bette L.
- Published
- 2011
- Full Text
- View/download PDF
103. PALEOCLIMATE: Coherent changes of southeastern equatorial and northern African rainfall during the last deglaciation
- Author
-
Otto-Bliesner, Bette L., Russell, James M., Clark, Peter U., Liu, Zhengyu, Overpeck, Jonathan T., Konecky, Bronwen, deMenocal, Peter, Nicholson, Sharon E., He, Feng, and Lu, Zhengyao
- Published
- 2014
- Full Text
- View/download PDF
104. North Atlantic subsurface temperature response controlled by effective freshwater input in “Heinrich” events
- Author
-
He, Chengfei, Liu, Zhengyu, Zhu, Jiang, Zhang, Jiaxu, Gu, Sifan, Otto-Bliesner, Bette L., Brady, Esther, Zhu, Chenyu, Jin, Yishuai, and Sun, Jingzhe
- Published
- 2020
- Full Text
- View/download PDF
105. Simulation of early Eocene water isotopes using an Earth system model and its implication for past climate reconstruction
- Author
-
Zhu, Jiang, Poulsen, Christopher J., Otto-Bliesner, Bette L., Liu, Zhengyu, Brady, Esther C., and Noone, David C.
- Published
- 2020
- Full Text
- View/download PDF
106. A comparison of PMIP2 model simulations and the MARGO proxy reconstruction for tropical sea surface temperatures at last glacial maximum
- Author
-
Otto-Bliesner, Bette L., Schneider, Ralph, Brady, E. C., Kucera, M., Abe-Ouchi, A., Bard, E., Braconnot, P., Crucifix, M., Hewitt, C. D., Kageyama, M., Marti, O., Paul, A., Rosell-Melé, A., Waelbroeck, C., Weber, S. L., Weinelt, M., and Yu, Y.
- Published
- 2009
- Full Text
- View/download PDF
107. A multi-model CMIP6-PMIP4 study of Arctic sea ice at 127 ka: sea ice data compilation and model differences
- Author
-
Kageyama, Masa, Sime, Louise C., Sicard, Marie, Guarino, Maria-Vittoria, de Vernal, Anne, Stein, Ruediger, Schroeder, David, Malmierca-Vallet, Irene, Abe-Ouchi, Ayako, Bitz, Cecilia, Braconnot, Pascale, Brady, Esther C., Cao, Jian, Chamberlain, Matthew A., Feltham, Danny, Guo, Chuncheng, LeGrande, Allegra N., Lohmann, Gerrit, Meissner, Katrin J., Menviel, Laurie, Morozova, Polina, Nisancioglu, Kerim H., Otto-Bliesner, Bette L., O'ishi, Ryouta, Ramos Buarque, Silvana, Salas y Melia, David, Sherriff-Tadano, Sam, Stroeve, Julienne, Shi, Xiaoxu, Sun, Bo, Tomas, Robert A., Volodin, Evgeny, Yeung, Nicholas K. H., Zhang, Qiong, Zhang, Zhongshi, Zheng, Weipeng, and Ziehn, Tilo
- Abstract
The Last Interglacial period (LIG) is a period with increased summer insolation at high northern latitudes, which results in strong changes in the terrestrial and marine cryosphere. Understanding the mechanisms for this response via climate modelling and comparing the models' representation of climate reconstructions is one of the objectives set up by the Paleoclimate Modelling Intercomparison Project for its contribution to the sixth phase of the Coupled Model Intercomparison Project. Here we analyse the results from 16 climate models in terms of Arctic sea ice. The multi-model mean reduction in minimum sea ice area from the pre industrial period (PI) to the LIG reaches 50 % (multi-model mean LIG area is 3.20×106 km2, compared to 6.46×106 km2 for the PI). On the other hand, there is little change for the maximum sea ice area (which is 15–16×106 km2 for both the PI and the LIG. To evaluate the model results we synthesise LIG sea ice data from marine cores collected in the Arctic Ocean, Nordic Seas and northern North Atlantic. The reconstructions for the northern North Atlantic show year-round ice-free conditions, and most models yield results in agreement with these reconstructions. Model–data disagreement appear for the sites in the Nordic Seas close to Greenland and at the edge of the Arctic Ocean. The northernmost site with good chronology, for which a sea ice concentration larger than 75 % is reconstructed even in summer, discriminates those models which simulate too little sea ice. However, the remaining models appear to simulate too much sea ice over the two sites south of the northernmost one, for which the reconstructed sea ice cover is seasonal. Hence models either underestimate or overestimate sea ice cover for the LIG, and their bias does not appear to be related to their bias for the pre-industrial period. Drivers for the inter-model differences are different phasing of the up and down short-wave anomalies over the Arctic Ocean, which are associated with differences in model albedo; possible cloud property differences, in terms of optical depth; and LIG ocean circulation changes which occur for some, but not all, LIG simulations. Finally, we note that inter-comparisons between the LIG simulations and simulations for future climate with moderate (1 % yr−1) CO2 increase show a relationship between LIG sea ice and sea ice simulated under CO2 increase around the years of doubling CO2. The LIG may therefore yield insight into likely 21st century Arctic sea ice changes using these LIG simulations.
- Published
- 2021
108. LGM paleoclimate constraints inform cloud parameterizations and equilibrium climate sensitivity in CESM2
- Author
-
Zhu, Jiang, primary, Otto-Bliesner, Bette L, additional, Brady, Esther C., additional, Poulsen, Christopher, additional, Shaw, Jonah K, additional, and Kay, Jennifer E, additional
- Published
- 2021
- Full Text
- View/download PDF
109. Evaluating the large-scale hydrological cycle response within the PlioMIP2 ensemble
- Author
-
Han, Zixuan, primary, Zhang, Qiong, additional, Li, Qiang, additional, Feng, Ran, additional, Haywood, Alan M., additional, Tindall, Julia C., additional, Hunter, Stephen J., additional, Otto-Bliesner, Bette L., additional, Brady, Esther C., additional, Rosenbloom, Nan, additional, Zhang, Zhongshi, additional, Li, Xiangyu, additional, Guo, Chuncheng, additional, Nisancioglu, Kerim H., additional, Stepanek, Christian, additional, Lohmann, Gerrit, additional, Sohl, Linda E., additional, Chandler, Mark A., additional, Tan, Ning, additional, Ramstein, Gilles, additional, Baatsen, Michiel L. J., additional, Heydt, Anna S. von der, additional, Chandan, Deepak, additional, Peltier, W. Richard, additional, Williams, Charles J. R., additional, Lunt, Daniel J., additional, Cheng, Jianbo, additional, Wen, Qin, additional, and Burls, Natalie J., additional
- Published
- 2021
- Full Text
- View/download PDF
110. Supplementary material to "Reduced El Niño variability in the mid-Pliocene according to the PlioMIP2 ensemble"
- Author
-
Oldeman, Arthur Merlijn, primary, Baatsen, Michiel L. J., additional, von der Heydt, Anna S., additional, Dijkstra, Henk A., additional, Tindall, Julia C., additional, Abe-Ouchi, Ayako, additional, Booth, Alice R., additional, Brady, Esther C., additional, Chan, Wing-Le, additional, Chandan, Deepak, additional, Chandler, Mark A., additional, Contoux, Camille, additional, Feng, Ran, additional, Guo, Chuncheng, additional, Haywood, Alan M., additional, Hunter, Stephen J., additional, Kamae, Youichi, additional, Li, Qiang, additional, Li, Xiangyu, additional, Lohmann, Gerrit, additional, Lunt, Daniel J., additional, Nisancioglu, Kerim H., additional, Otto-Bliesner, Bette L., additional, Peltier, W. Richard, additional, Pontes, Gabriel M., additional, Ramstein, Gilles, additional, Sohl, Linda E., additional, Stepanek, Christian, additional, Tan, Ning, additional, Zhang, Qiong, additional, Zhang, Zhongshi, additional, Wainer, Ilana, additional, and Williams, Charles J. R., additional
- Published
- 2021
- Full Text
- View/download PDF
111. Reduced El Niño variability in the mid-Pliocene according to the PlioMIP2 ensemble
- Author
-
Oldeman, Arthur Merlijn, primary, Baatsen, Michiel L. J., additional, von der Heydt, Anna S., additional, Dijkstra, Henk A., additional, Tindall, Julia C., additional, Abe-Ouchi, Ayako, additional, Booth, Alice R., additional, Brady, Esther C., additional, Chan, Wing-Le, additional, Chandan, Deepak, additional, Chandler, Mark A., additional, Contoux, Camille, additional, Feng, Ran, additional, Guo, Chuncheng, additional, Haywood, Alan M., additional, Hunter, Stephen J., additional, Kamae, Youichi, additional, Li, Qiang, additional, Li, Xiangyu, additional, Lohmann, Gerrit, additional, Lunt, Daniel J., additional, Nisancioglu, Kerim H., additional, Otto-Bliesner, Bette L., additional, Peltier, W. Richard, additional, Pontes, Gabriel M., additional, Ramstein, Gilles, additional, Sohl, Linda E., additional, Stepanek, Christian, additional, Tan, Ning, additional, Zhang, Qiong, additional, Zhang, Zhongshi, additional, Wainer, Ilana, additional, and Williams, Charles J. R., additional
- Published
- 2021
- Full Text
- View/download PDF
112. Past climates inform our future
- Author
-
Tierney, Jessica E., Poulsen, Christopher J., Montanez, Isabel, Bhattacharya, Tripti, Feng, Ran, Ford, Heather, Hönisch, Bärbel, Inglis, Gordon, Petersen, Sierra, Sagoo, Navjit, Tabor, Clay, Thirumalai, Kaustubh, Zhu, Jiang, Burls, Natalie, Godderis, Yves, Foster, Gavin, Huber, Brian T., Ivany, Linda, Kirtland Turner, Sandra, Lunt, Daniel, McElwain, Jennifer, Mills, Benjamin, Otto-Bliesner, Bette L., Ridgwell, Andy, and Ge Zhang, Yi
- Abstract
As the world warms, there is a profound need to improve projections of climate change. Although the latest Earth system models offer an unprecedented number of features, fundamental uncertainties continue to cloud our view of the future. Past climates provide the only opportunity to observe how the Earth system responds to high carbon dioxide, underlining a fundamental role for paleoclimatology in constraining future climate change. Here, we review the relevancy of paleoclimate information for climate prediction and discuss the prospects for emerging methodologies to further insights gained from past climates. Advances in proxy methods and interpretations pave the way for the use of past climates for model evaluation—a practice that we argue should be widely adopted.
- Published
- 2020
113. Lessons from a high-CO2 world: An ocean view from ∼3 million years ago
- Author
-
McClymont, Erin L., Ford, Heather L., Ling Ho, Sze, Tindall, Julia C., Haywood, Alan M., Alonso-Garcia, Montserrat, Bailey, Ian, Berke, Melissa A., Littler, Kate, Patterson, Molly O., Petrick, Benjamin, Peterse, Francien, Christina Ravelo, A., Risebrobakken, Bjorg, De Schepper, Stijn, Swann, George E.A., Thirumalai, Kaustubh, Tierney, Jessica E., van der Weijst, Carolien, White, Sarah, Abe-Ouchi, Ayako, Baatsen, Michiel L.J., Brady, Esther C., Chan, Wing Le, Chandan, Deepak, Feng, Ran, Guo, Chuncheng, Von Der Heydt, Anna S., Hunter, Stephen, Li, Xiangyi, Lohmann, Gerrit, Nisancioglu, Kerim H., Otto-Bliesner, Bette L., Richard Peltier, W., Stepanek, Christian, Zhang, Zhongshi, Marine and Atmospheric Research, Organic geochemistry, Marine palynology and palaeoceanography, Sub Dynamics Meteorology, Sub Physical Oceanography, and Marine Palynology
- Subjects
Global and Planetary Change ,Stratigraphy ,Palaeontology - Abstract
A range of future climate scenarios are projected for high atmospheric CO2 concentrations, given uncertainties over future human actions as well as potential environmental and climatic feedbacks. The geological record offers an opportunity to understand climate system response to a range of forcings and feedbacks which operate over multiple temporal and spatial scales. Here, we examine a single interglacial during the late Pliocene (KM5c, ca. 3:205_0:01 Ma) when atmospheric CO2 exceeded pre-industrial concentrations, but were similar to today and to the lowest emission scenarios for this century. As orbital forcing and continental configurations were almost identical to today, we are able to focus on equilibrium climate system response to modern and near-future CO2. Using proxy data from 32 sites, we demonstrate that global mean sea-surface temperatures were warmer than pre-industrial values, by 2:3 C for the combined proxy data (foraminifera Mg=Ca and alkenones), or by 3:2 3.4 C (alkenones only). Compared to the preindustrial period, reduced meridional gradients and enhanced warming in the North Atlantic are consistently reconstructed. There is broad agreement between data and models at the global scale, with regional differences reflecting ocean circulation and/or proxy signals. An uneven distribution of proxy data in time and space does, however, add uncertainty to our anomaly calculations. The reconstructed global mean seasurface temperature anomaly for KM5c is warmer than all but three of the PlioMIP2 model outputs, and the reconstructed North Atlantic data tend to align with the warmest KM5c model values. Our results demonstrate that even under low-CO2 emission scenarios, surface ocean warming may be expected to exceed model projections and will be accentuated in the higher latitudes.
- Published
- 2020
114. Lessons from a high-CO2 world: an ocean view from ∼ 3 million years ago
- Author
-
McClymont, Erin L., Ford, Heather L., Ho, Sze Ling, Tindall, Julia C., Haywood, Alan M., Alonso-Garcia, Montserrat, Bailey, Ian, Berke, Melissa A., Littler, Kate, Patterson, Molly O., Petrick, Benjamin, Peterse, Francien, Ravelo, A. Christina, De Schepper, Stijn, Swann, George E. A., Thirumalai, Kaustubh, Tierney, Jessica E., van der Weijst, Carolien, White, Sarah, Abe-Ouchi, Ayako, Baatsen, Michiel L. J., Brady, Esther C., Chan, Wing-Le, Chandan, Deepak, Feng, Ran, Guo, Chuncheng, von der Heydt, Anna S., Hunter, Stephen, Li, Xiangyi, Lohmann, Gerrit, Nisancioglu, Kerim H., Otto-Bliesner, Bette L., Peltier, W. Richard, Stepanek, Christian, and Zhang, Zhongshi
- Subjects
Global and Planetary Change ,Stratigraphy ,Palaeontology - Abstract
A range of future climate scenarios are projected for high atmospheric CO2 concentrations, given uncertainties over future human actions as well as potential environmental and climatic feedbacks. The geological record offers an opportunity to understand climate system response to a range of forcings and feedbacks which operate over multiple temporal and spatial scales. Here, we examine a single interglacial during the late Pliocene (KM5c, ca. 3.205±0.01 Ma) when atmospheric CO2 exceeded pre-industrial concentrations, but were similar to today and to the lowest emission scenarios for this century. As orbital forcing and continental configurations were almost identical to today, we are able to focus on equilibrium climate system response to modern and near-future CO2. Using proxy data from 32 sites, we demonstrate that global mean sea-surface temperatures were warmer than pre-industrial values, by ∼2.3 ∘C for the combined proxy data (foraminifera Mg∕Ca and alkenones), or by ∼3.2–3.4 ∘C (alkenones only). Compared to the pre-industrial period, reduced meridional gradients and enhanced warming in the North Atlantic are consistently reconstructed. There is broad agreement between data and models at the global scale, with regional differences reflecting ocean circulation and/or proxy signals. An uneven distribution of proxy data in time and space does, however, add uncertainty to our anomaly calculations. The reconstructed global mean sea-surface temperature anomaly for KM5c is warmer than all but three of the PlioMIP2 model outputs, and the reconstructed North Atlantic data tend to align with the warmest KM5c model values. Our results demonstrate that even under low-CO2 emission scenarios, surface ocean warming may be expected to exceed model projections and will be accentuated in the higher latitudes.
- Published
- 2020
115. Evaluating the large-scale hydrological cycle response within the Pliocene Model Intercomparison Project Phase 2 (PlioMIP2) ensemble
- Author
-
Han, Zixuan, Zhang, Qiong, Li, Qiang, Feng, Ran, Haywood, Alan M., Tindall, Julia C., Hunter, Stephen J., Otto-Bliesner, Bette L., Brady, Esther C., Rosenbloom, Nan, Zhang, Zhongshi, Li, Xiangyu, Guo, Chuncheng, Nisancioglu, Kerim H., Stepanek, Christian, Lohmann, Gerrit, Sohl, Linda E., Chandler, Mark A., Tan, Ning, Ramstein, Gilles, Baatsen, Michiel L.J., Von Der Heydt, Anna S., Chandan, Deepak, Peltier, W. Richard, Williams, Charles J.R., Lunt, Daniel J., Cheng, Jianbo, Wen, Qin, Burls, Natalie J., Han, Zixuan, Zhang, Qiong, Li, Qiang, Feng, Ran, Haywood, Alan M., Tindall, Julia C., Hunter, Stephen J., Otto-Bliesner, Bette L., Brady, Esther C., Rosenbloom, Nan, Zhang, Zhongshi, Li, Xiangyu, Guo, Chuncheng, Nisancioglu, Kerim H., Stepanek, Christian, Lohmann, Gerrit, Sohl, Linda E., Chandler, Mark A., Tan, Ning, Ramstein, Gilles, Baatsen, Michiel L.J., Von Der Heydt, Anna S., Chandan, Deepak, Peltier, W. Richard, Williams, Charles J.R., Lunt, Daniel J., Cheng, Jianbo, Wen, Qin, and Burls, Natalie J.
- Abstract
The mid-Pliocene (g1/43 Ma) is one of the most recent warm periods with high CO2 concentrations in the atmosphere and resulting high temperatures, and it is often cited as an analog for near-term future climate change. Here, we apply a moisture budget analysis to investigate the response of the large-scale hydrological cycle at low latitudes within a 13-model ensemble from the Pliocene Model Intercomparison Project Phase 2 (PlioMIP2). The results show that increased atmospheric moisture content within the mid-Pliocene ensemble (due to the thermodynamic effect) results in wetter conditions over the deep tropics, i.e., the Pacific intertropical convergence zone (ITCZ) and the Maritime Continent, and drier conditions over the subtropics. Note that the dynamic effect plays a more important role than the thermodynamic effect in regional precipitation minus evaporation (PmE) changes (i.e., northward ITCZ shift and wetter northern Indian Ocean). The thermodynamic effect is offset to some extent by a dynamic effect involving a northward shift of the Hadley circulation that dries the deep tropics and moistens the subtropics in the Northern Hemisphere (i.e., the subtropical Pacific). From the perspective of Earth's energy budget, the enhanced southward cross-equatorial atmospheric transport (0.22 PW), induced by the hemispheric asymmetries of the atmospheric energy, favors an approximately 1g? northward shift of the ITCZ. The shift of the ITCZ reorganizes atmospheric circulation, favoring a northward shift of the Hadley circulation. In addition, the Walker circulation consistently shifts westward within PlioMIP2 models, leading to wetter conditions over the northern Indian Ocean. The PlioMIP2 ensemble highlights that an imbalance of interhemispheric atmospheric energy during the mid-Pliocene could have led to changes in the dynamic effect, offsetting the thermodynamic effect and, hence, altering mid-Pliocene hydroclimate.
- Published
- 2021
116. Reduced El Niño variability in the mid-Pliocene according to the PlioMIP2 ensemble
- Author
-
Oldeman, Arthur M., Baatsen, Michiel L. J., von der Heydt, Anna S., Dijkstra, Henk A., Tindall, Julia C., Abe-Ouchi, Ayako, Booth, Alice R., Brady, Esther C., Chan, Wing-Le, Chandan, Deepak, Chandler, Mark A., Contoux, Camille, Feng, Ran, Guo, Chuncheng, Haywood, Alan M., Hunter, Stephen J., Kamae, Youichi, Li, Qiang, Li, Xiangyu, Lohmann, Gerrit, Lunt, Daniel J., Nisancioglu, Kerim H., Otto-Bliesner, Bette L., Peltier, W. Richard, Pontes, Gabriel M., Ramstein, Gilles, Sohl, Linda E., Stepanek, Christian, Tan, Ning, Zhang, Qiong, Zhang, Zhongshi, Wainer, Ilana, Williams, Charles J. R., Oldeman, Arthur M., Baatsen, Michiel L. J., von der Heydt, Anna S., Dijkstra, Henk A., Tindall, Julia C., Abe-Ouchi, Ayako, Booth, Alice R., Brady, Esther C., Chan, Wing-Le, Chandan, Deepak, Chandler, Mark A., Contoux, Camille, Feng, Ran, Guo, Chuncheng, Haywood, Alan M., Hunter, Stephen J., Kamae, Youichi, Li, Qiang, Li, Xiangyu, Lohmann, Gerrit, Lunt, Daniel J., Nisancioglu, Kerim H., Otto-Bliesner, Bette L., Peltier, W. Richard, Pontes, Gabriel M., Ramstein, Gilles, Sohl, Linda E., Stepanek, Christian, Tan, Ning, Zhang, Qiong, Zhang, Zhongshi, Wainer, Ilana, and Williams, Charles J. R.
- Abstract
The mid-Pliocene warm period (3.264–3.025 Ma) is the most recent geological period during which atmospheric CO2 levels were similar to recent historical values (∼400 ppm). Several proxy reconstructions for the mid-Pliocene show highly reduced zonal sea surface temperature (SST) gradients in the tropical Pacific Ocean, indicating an El Niño-like mean state. However, past modelling studies do not show these highly reduced gradients. Efforts to understand mid-Pliocene climate dynamics have led to the Pliocene Model Intercomparison Project (PlioMIP). Results from the first phase (PlioMIP1) showed clear El Niño variability (albeit significantly reduced) and did not show the greatly reduced time-mean zonal SST gradient suggested by some of the proxies. In this work, we study El Niño–Southern Oscillation (ENSO) variability in the PlioMIP2 ensemble, which consists of additional global coupled climate models and updated boundary conditions compared to PlioMIP1. We quantify ENSO amplitude, period, spatial structure and “flavour”, as well as the tropical Pacific annual mean state in mid-Pliocene and pre-industrial simulations. Results show a reduced ENSO amplitude in the model-ensemble mean (−24 %) with respect to the pre-industrial, with 15 out of 17 individual models showing such a reduction. Furthermore, the spectral power of this variability considerably decreases in the 3–4-year band. The spatial structure of the dominant empirical orthogonal function shows no particular change in the patterns of tropical Pacific variability in the model-ensemble mean, compared to the pre-industrial. Although the time-mean zonal SST gradient in the equatorial Pacific decreases for 14 out of 17 models (0.2 ∘C reduction in the ensemble mean), there does not seem to be a correlation with the decrease in ENSO amplitude. The models showing the most “El Niño-like” mean state changes show a similar ENSO amplitude to that in the pre-industrial reference, while models showing more “La Niña-like” m
- Published
- 2021
117. Mid-Pliocene West African Monsoon rainfall as simulated in the PlioMIP2 ensemble
- Author
-
Sub Dynamics Meteorology, Sub Physical Oceanography, Marine and Atmospheric Research, Berntell, Ellen, Zhang, Qiong, Li, Qiang, Haywood, Alan M., Tindall, Julia C., Hunter, Stephen J., Zhang, Zhongshi, Li, Xiangyu, Guo, Chuncheng, Nisancioglu, Kerim H., Stepanek, Christian, Lohmann, Gerrit, Sohl, Linda E., Chandler, Mark A., Tan, Ning, Contoux, Camille, Ramstein, Gilles, Baatsen, Michiel L.J., Von Der Heydt, Anna S., Chandan, Deepak, Peltier, William Richard, Abe-Ouchi, Ayako, Chan, Wing Le, Kamae, Youichi, Williams, Charles J.R., Lunt, Daniel J., Feng, Ran, Otto-Bliesner, Bette L., Brady, Esther C., Sub Dynamics Meteorology, Sub Physical Oceanography, Marine and Atmospheric Research, Berntell, Ellen, Zhang, Qiong, Li, Qiang, Haywood, Alan M., Tindall, Julia C., Hunter, Stephen J., Zhang, Zhongshi, Li, Xiangyu, Guo, Chuncheng, Nisancioglu, Kerim H., Stepanek, Christian, Lohmann, Gerrit, Sohl, Linda E., Chandler, Mark A., Tan, Ning, Contoux, Camille, Ramstein, Gilles, Baatsen, Michiel L.J., Von Der Heydt, Anna S., Chandan, Deepak, Peltier, William Richard, Abe-Ouchi, Ayako, Chan, Wing Le, Kamae, Youichi, Williams, Charles J.R., Lunt, Daniel J., Feng, Ran, Otto-Bliesner, Bette L., and Brady, Esther C.
- Published
- 2021
118. Evaluating the large-scale hydrological cycle response within the Pliocene Model Intercomparison Project Phase 2 (PlioMIP2) ensemble
- Author
-
Sub Dynamics Meteorology, Sub Physical Oceanography, Marine and Atmospheric Research, Han, Zixuan, Zhang, Qiong, Li, Qiang, Feng, Ran, Haywood, Alan M., Tindall, Julia C., Hunter, Stephen J., Otto-Bliesner, Bette L., Brady, Esther C., Rosenbloom, Nan, Zhang, Zhongshi, Li, Xiangyu, Guo, Chuncheng, Nisancioglu, Kerim H., Stepanek, Christian, Lohmann, Gerrit, Sohl, Linda E., Chandler, Mark A., Tan, Ning, Ramstein, Gilles, Baatsen, Michiel L.J., Von Der Heydt, Anna S., Chandan, Deepak, Peltier, W. Richard, Williams, Charles J.R., Lunt, Daniel J., Cheng, Jianbo, Wen, Qin, Burls, Natalie J., Sub Dynamics Meteorology, Sub Physical Oceanography, Marine and Atmospheric Research, Han, Zixuan, Zhang, Qiong, Li, Qiang, Feng, Ran, Haywood, Alan M., Tindall, Julia C., Hunter, Stephen J., Otto-Bliesner, Bette L., Brady, Esther C., Rosenbloom, Nan, Zhang, Zhongshi, Li, Xiangyu, Guo, Chuncheng, Nisancioglu, Kerim H., Stepanek, Christian, Lohmann, Gerrit, Sohl, Linda E., Chandler, Mark A., Tan, Ning, Ramstein, Gilles, Baatsen, Michiel L.J., Von Der Heydt, Anna S., Chandan, Deepak, Peltier, W. Richard, Williams, Charles J.R., Lunt, Daniel J., Cheng, Jianbo, Wen, Qin, and Burls, Natalie J.
- Published
- 2021
119. DeepMIP: Model intercomparison of early Eocene climatic optimum (EECO) large-scale climate features and comparison with proxy data
- Author
-
Lunt, Daniel J, Bragg, Fran, Chan, Wing-Le, Hutchinson, David K, Ladant, Jean-Baptiste, Morozova, Polina, Niezgodzki, Igor, Steinig, Sebastian, Zhang, Zhongshi, Zhu, Jiang, Abe-Ouchi, Ayako, Anagnostou, Eleni, de Boer, Agatha M., Coxall, Helen K., Donnadieu, Yannick, Foster, Gavin, Inglis, Gordon N., Knorr, Gregor, Langebroek, Petra M., Lear, Caroline H., Lohmann, Gerrit, Poulsen, Christopher J., Sepulchre, Pierre, Tierney, Jessica E., Valdes, Paul J., Volodin, Evgeny M., Jones, Tom Dunkley, Hollis, Christopher J., Huber, Matthew, Otto-Bliesner, Bette L., Lunt, Daniel J, Bragg, Fran, Chan, Wing-Le, Hutchinson, David K, Ladant, Jean-Baptiste, Morozova, Polina, Niezgodzki, Igor, Steinig, Sebastian, Zhang, Zhongshi, Zhu, Jiang, Abe-Ouchi, Ayako, Anagnostou, Eleni, de Boer, Agatha M., Coxall, Helen K., Donnadieu, Yannick, Foster, Gavin, Inglis, Gordon N., Knorr, Gregor, Langebroek, Petra M., Lear, Caroline H., Lohmann, Gerrit, Poulsen, Christopher J., Sepulchre, Pierre, Tierney, Jessica E., Valdes, Paul J., Volodin, Evgeny M., Jones, Tom Dunkley, Hollis, Christopher J., Huber, Matthew, and Otto-Bliesner, Bette L.
- Published
- 2021
120. Mid-Pliocene Atlantic Meridional Overturning Circulation simulated in PlioMIP2
- Author
-
Zhang, Zhongshi, Li, X., Guo, Chuncheng, Ottera, O. H., Nisancioglu, Kerim H., Tan, N., Contoux, C., Ramstein, G., Feng, Ran, Otto-Bliesner, Bette L., Brady, Esther C., Chandan, Deepak, Peltier, W. R., von der Heydt, Anna S., Weiffenbach, Julia E., Stepanek, Christian, Lohmann, Gerrit, Zhang, Q., Li, Q., Chandler, M. A., Sohl, Linda E., Haywood, A. M., Hunter, S. J., Tindall, Julia C., Williams, C., Lunt, D. J., Chan, Wing-Le, Abe-Ouchi, A., Zhang, Zhongshi, Li, X., Guo, Chuncheng, Ottera, O. H., Nisancioglu, Kerim H., Tan, N., Contoux, C., Ramstein, G., Feng, Ran, Otto-Bliesner, Bette L., Brady, Esther C., Chandan, Deepak, Peltier, W. R., von der Heydt, Anna S., Weiffenbach, Julia E., Stepanek, Christian, Lohmann, Gerrit, Zhang, Q., Li, Q., Chandler, M. A., Sohl, Linda E., Haywood, A. M., Hunter, S. J., Tindall, Julia C., Williams, C., Lunt, D. J., Chan, Wing-Le, and Abe-Ouchi, A.
- Abstract
In the Pliocene Model Intercomparison Project Phase 2 (PlioMIP2), coupled climate models have been used to simulate an interglacial climate during the mid-Piacenzian warm period (mPWP; 3.264 to 3.025 Ma). Here, we compare the Atlantic Meridional Overturning Circulation (AMOC), poleward ocean heat transport and sea surface warming in the Atlantic simulated with these models. In PlioMIP2, all models simulate an intensified mid-Pliocene AMOC. However, there is no consistent response in the simulated Atlantic ocean heat transport nor in the depth of the Atlantic overturning cell. The models show a large spread in the simulated AMOC maximum, the Atlantic ocean heat transport and the surface warming in the North Atlantic. Although a few models simulate a surface warming of ∼ 8–12 ∘C in the North Atlantic, similar to the reconstruction from Pliocene Research, Interpretation and Synoptic Mapping (PRISM) version 4, most models appear to underestimate this warming. The large model spread and model–data discrepancies in the PlioMIP2 ensemble do not support the hypothesis that an intensification of the AMOC, together with an increase in northward ocean heat transport, is the dominant mechanism for the mid-Pliocene warm climate over the North Atlantic.
- Published
- 2021
121. Large-scale features of Last Interglacial climate: results from evaluating the lig127k simulations for the Coupled Model Intercomparison Project (CMIP6)–Paleoclimate Modeling Intercomparison Project (PMIP4)
- Author
-
Otto-Bliesner, Bette L., Brady, Esther C., Zhao, Anni, Brierley, Chris M., Axford, Yarrow, Capron, Emilie, Govin, Aline, Hoffman, Jeremy S., Isaacs, Elizabeth, Kageyama, Masa, Scussolini, Paolo, Tzedakis, Polychronis C., Williams, Charles J. R., Wolff, Eric, Abe-Ouchi, Ayako, Braconnot, Pascale, Ramos Buarque, Silvana, Cao, Jian, de Vernal, Anne, Guarino, Maria Vittoria, Guo, Chuncheng, LeGrande, Allegra N., Lohmann, Gerrit, Meissner, Katrin J., Menviel, Laurie, Morozova, Polina A., Nisancioglu, Kerim H., O'ishi, Ryouta, Salas y Mélia, David, Shi, Xiaoxu, Sicard, Marie, Sime, Louise, Stepanek, Christian, Tomas, Robert, Volodin, Evgeny, Yeung, Nicholas K. H., Zhang, Qiong, Zhang, Zhongshi, Zheng, Weipeng, Otto-Bliesner, Bette L., Brady, Esther C., Zhao, Anni, Brierley, Chris M., Axford, Yarrow, Capron, Emilie, Govin, Aline, Hoffman, Jeremy S., Isaacs, Elizabeth, Kageyama, Masa, Scussolini, Paolo, Tzedakis, Polychronis C., Williams, Charles J. R., Wolff, Eric, Abe-Ouchi, Ayako, Braconnot, Pascale, Ramos Buarque, Silvana, Cao, Jian, de Vernal, Anne, Guarino, Maria Vittoria, Guo, Chuncheng, LeGrande, Allegra N., Lohmann, Gerrit, Meissner, Katrin J., Menviel, Laurie, Morozova, Polina A., Nisancioglu, Kerim H., O'ishi, Ryouta, Salas y Mélia, David, Shi, Xiaoxu, Sicard, Marie, Sime, Louise, Stepanek, Christian, Tomas, Robert, Volodin, Evgeny, Yeung, Nicholas K. H., Zhang, Qiong, Zhang, Zhongshi, and Zheng, Weipeng
- Abstract
The modeling of paleoclimate, using physically based tools, is increasingly seen as a strong out-of-sample test of the models that are used for the projection of future climate changes. New to the Coupled Model Intercomparison Project (CMIP6) is the Tier 1 Last Interglacial experiment for 127 000 years ago (lig127k), designed to address the climate responses to stronger orbital forcing than the midHolocene experiment, using the same state-of-the-art models as for the future and following a common experimental protocol. Here we present a first analysis of a multi-model ensemble of 17 climate models, all of which have completed the CMIP6 DECK (Diagnostic, Evaluation and Characterization of Klima) experiments. The equilibrium climate sensitivity (ECS) of these models varies from 1.8 to 5.6 ∘C. The seasonal character of the insolation anomalies results in strong summer warming over the Northern Hemisphere continents in the lig127k ensemble as compared to the CMIP6 piControl and much-reduced minimum sea ice in the Arctic. The multi-model results indicate enhanced summer monsoonal precipitation in the Northern Hemisphere and reductions in the Southern Hemisphere. These responses are greater in the lig127k than the CMIP6 midHolocene simulations as expected from the larger insolation anomalies at 127 than 6 ka. New synthesis for surface temperature and precipitation, targeted for 127 ka, have been developed for comparison to the multi-model ensemble. The lig127k model ensemble and data reconstructions are in good agreement for summer temperature anomalies over Canada, Scandinavia, and the North Atlantic and for precipitation over the Northern Hemisphere continents. The model–data comparisons and mismatches point to further study of the sensitivity of the simulations to uncertainties in the boundary conditions and of the uncertainties and sparse coverage in current proxy reconstructions. The CMIP6–Paleoclimate Modeling Intercomparison Project (PMIP4) lig127k simulations, in
- Published
- 2021
122. DeepMIP : model intercomparison of early Eocene climatic optimum (EECO) large-scale climate features and comparison with proxy data
- Author
-
Lunt, Daniel J., Bragg, Fran, Chan, Wing-Le, Hutchinson, David K., Ladant, Jean-Baptiste, Morozova, Polina, Niezgodzki, Igor, Steinig, Sebastian, Zhang, Zhongshi, Zhu, Jiang, Abe-Ouchi, Ayako, Anagnostou, Eleni, de Boer, Agatha M., Coxall, Helen K., Donnadieu, Yannick, Foster, Gavin, Inglis, Gordon N., Knorr, Gregor, Langebroek, Petra M., Lear, Caroline H., Lohmann, Gerrit, Poulsen, Christopher J., Sepulchre, Pierre, Tierney, Jessica E., Valdes, Paul J., Volodin, Evgeny M., Dunkley Jones, Tom, Hollis, Christopher J., Huber, Matthew, Otto-Bliesner, Bette L., Lunt, Daniel J., Bragg, Fran, Chan, Wing-Le, Hutchinson, David K., Ladant, Jean-Baptiste, Morozova, Polina, Niezgodzki, Igor, Steinig, Sebastian, Zhang, Zhongshi, Zhu, Jiang, Abe-Ouchi, Ayako, Anagnostou, Eleni, de Boer, Agatha M., Coxall, Helen K., Donnadieu, Yannick, Foster, Gavin, Inglis, Gordon N., Knorr, Gregor, Langebroek, Petra M., Lear, Caroline H., Lohmann, Gerrit, Poulsen, Christopher J., Sepulchre, Pierre, Tierney, Jessica E., Valdes, Paul J., Volodin, Evgeny M., Dunkley Jones, Tom, Hollis, Christopher J., Huber, Matthew, and Otto-Bliesner, Bette L.
- Abstract
We present results from an ensemble of eight climate models, each of which has carried out simulations of the early Eocene climate optimum (EECO, similar to 50 million years ago). These simulations have been carried out in the framework of the Deep-Time Model Intercomparison Project (DeepMIP; http://www.deepmip.org , last access: 10 January 2021); thus, all models have been configured with the same paleogeographic and vegetation boundary conditions. The results indicate that these non-CO2 boundary conditions contribute between 3 and 5 degrees C to Eocene warmth. Compared with results from previous studies, the DeepMIP simulations generally show a reduced spread of the global mean surface temperature response across the ensemble for a given atmospheric CO2 concentration as well as an increased climate sensitivity on average. An energy balance analysis of the model ensemble indicates that global mean warming in the Eocene compared with the preindustrial period mostly arises from decreases in emissivity due to the elevated CO2 concentration (and associated water vapour and long-wave cloud feedbacks), whereas the reduction in the Eocene in terms of the meridional temperature gradient is primarily due to emissivity and albedo changes owing to the non-CO2 boundary conditions (i.e. the removal of the Antarctic ice sheet and changes in vegetation). Three of the models (the Community Earth System Model, CESM; the Geophysical Fluid Dynamics Laboratory, GFDL, model; and the Norwegian Earth System Model, NorESM) show results that are consistent with the proxies in terms of the global mean temperature, meridional SST gradient, and CO2, without prescribing changes to model parameters. In addition, many of the models agree well with the first-order spatial patterns in the SST proxies. However, at a more regional scale, the models lack skill. In particular, the modelled anomalies are substantially lower than those indicated by the proxies in the southwest Pacific; here, modelled co
- Published
- 2021
- Full Text
- View/download PDF
123. Large-scale features of Last Interglacial climate:results from evaluating the lig127k simulations for the Coupled Model Intercomparison Project (CMIP6)-Paleoclimate Modeling Intercomparison Project (PMIP4)
- Author
-
Otto-Bliesner, Bette L., Brady, Esther C., Zhao, Anni, Brierley, Chris M., Axford, Yarrow, Capron, Emilie, Govin, Aline, Hoffman, Jeremy S., Isaacs, Elizabeth, Kageyama, Masa, Scussolini, Paolo, Tzedakis, Polychronis C., Williams, Charles J. R., Wolff, Eric, Abe-Ouchi, Ayako, Braconnot, Pascale, Buarque, Silvana Ramos, Cao, Jian, de Vernal, Anne, Guarino, Maria Vittoria, Guo, Chuncheng, LeGrande, Allegra N., Lohmann, Gerrit, Meissner, Katrin J., Menviel, Laurie, Morozova, Polina A., Nisancioglu, Kerim H., O'ishi, Ryouta, Melia, David Salas y, Shi, Xiaoxu, Sicard, Marie, Sime, Louise, Stepanek, Christian, Tomas, Robert, Volodin, Evgeny, Yeung, Nicholas K. H., Zhang, Qiong, Zhang, Zhongshi, Zheng, Weipeng, Otto-Bliesner, Bette L., Brady, Esther C., Zhao, Anni, Brierley, Chris M., Axford, Yarrow, Capron, Emilie, Govin, Aline, Hoffman, Jeremy S., Isaacs, Elizabeth, Kageyama, Masa, Scussolini, Paolo, Tzedakis, Polychronis C., Williams, Charles J. R., Wolff, Eric, Abe-Ouchi, Ayako, Braconnot, Pascale, Buarque, Silvana Ramos, Cao, Jian, de Vernal, Anne, Guarino, Maria Vittoria, Guo, Chuncheng, LeGrande, Allegra N., Lohmann, Gerrit, Meissner, Katrin J., Menviel, Laurie, Morozova, Polina A., Nisancioglu, Kerim H., O'ishi, Ryouta, Melia, David Salas y, Shi, Xiaoxu, Sicard, Marie, Sime, Louise, Stepanek, Christian, Tomas, Robert, Volodin, Evgeny, Yeung, Nicholas K. H., Zhang, Qiong, Zhang, Zhongshi, and Zheng, Weipeng
- Abstract
The modeling of paleoclimate, using physically based tools, is increasingly seen as a strong out-of-sample test of the models that are used for the projection of future climate changes. New to the Coupled Model Intercomparison Project (CMIP6) is the Tier 1 Last Interglacial experiment for 127 000 years ago (lig127k), designed to address the climate responses to stronger orbital forcing than the mid-Holocene experiment, using the same state-of-the-art models as for the future and following a common experimental protocol. Here we present a first analysis of a multi-model ensemble of 17 climate models, all of which have completed the CMIP6 DECK (Diagnostic, Evaluation and Characterization of Klima) experiments. The equilibrium climate sensitivity (ECS) of these models varies from 1.8 to 5.6 degrees C. The seasonal character of the insolation anomalies results in strong summer warming over the Northern Hemisphere continents in the lig127k ensemble as compared to the CMIP6 piControl and much-reduced minimum sea ice in the Arctic. The multi-model results indicate enhanced summer monsoonal precipitation in the Northern Hemisphere and reductions in the Southern Hemisphere. These responses are greater in the lig127k than the CMIP6 midHolocene simulations as expected from the larger insolation anomalies at 127 than 6 ka.New synthesis for surface temperature and precipitation, targeted for 127 ka, have been developed for comparison to the multi-model ensemble. The lig127k model ensemble and data reconstructions are in good agreement for summer temperature anomalies over Canada, Scandinavia, and the North Atlantic and for precipitation over the Northern Hemisphere continents. The model-data comparisons and mismatches point to further study of the sensitivity of the simulations to uncertainties in the boundary conditions and of the uncertainties and sparse coverage in current proxy reconstructions.The CMIP6-Paleoclimate Modeling Intercomparison Project (PMIP4) l
- Published
- 2021
124. Simulated Two-Stage Recovery of Atlantic Meridional Overturning Circulation During the Last Deglaciation
- Author
-
Cheng, Jun, primary, Liu, Zhengyu, additional, He, Feng, additional, Otto-Bliesner, Bette L., additional, Brady, Esther C., additional, and Wehrenberg, Mark, additional
- Published
- 2011
- Full Text
- View/download PDF
125. Mid-Pliocene Atlantic Meridional Overturning Circulation simulated in PlioMIP2
- Author
-
Zhang, Zhongshi, primary, Li, Xiangyu, additional, Guo, Chuncheng, additional, Otterå, Odd Helge, additional, Nisancioglu, Kerim H., additional, Tan, Ning, additional, Contoux, Camille, additional, Ramstein, Gilles, additional, Feng, Ran, additional, Otto-Bliesner, Bette L., additional, Brady, Esther, additional, Chandan, Deepak, additional, Peltier, W. Richard, additional, Baatsen, Michiel L. J., additional, von der Heydt, Anna S., additional, Weiffenbach, Julia E., additional, Stepanek, Christian, additional, Lohmann, Gerrit, additional, Zhang, Qiong, additional, Li, Qiang, additional, Chandler, Mark A., additional, Sohl, Linda E., additional, Haywood, Alan M., additional, Hunter, Stephen J., additional, Tindall, Julia C., additional, Williams, Charles, additional, Lunt, Daniel J., additional, Chan, Wing-Le, additional, and Abe-Ouchi, Ayako, additional
- Published
- 2021
- Full Text
- View/download PDF
126. Assessment of Equilibrium Climate Sensitivity of the Community Earth System Model Version 2 Through Simulation of the Last Glacial Maximum
- Author
-
Zhu, Jiang, primary, Otto‐Bliesner, Bette L., additional, Brady, Esther C., additional, Poulsen, Christopher J., additional, Tierney, Jessica E., additional, Lofverstrom, Marcus, additional, and DiNezio, Pedro, additional
- Published
- 2021
- Full Text
- View/download PDF
127. DeepMIP: model intercomparison of early Eocene climatic optimum (EECO) large-scale climate features and comparison with proxy data
- Author
-
Lunt, Daniel J., primary, Bragg, Fran, additional, Chan, Wing-Le, additional, Hutchinson, David K., additional, Ladant, Jean-Baptiste, additional, Morozova, Polina, additional, Niezgodzki, Igor, additional, Steinig, Sebastian, additional, Zhang, Zhongshi, additional, Zhu, Jiang, additional, Abe-Ouchi, Ayako, additional, Anagnostou, Eleni, additional, de Boer, Agatha M., additional, Coxall, Helen K., additional, Donnadieu, Yannick, additional, Foster, Gavin, additional, Inglis, Gordon N., additional, Knorr, Gregor, additional, Langebroek, Petra M., additional, Lear, Caroline H., additional, Lohmann, Gerrit, additional, Poulsen, Christopher J., additional, Sepulchre, Pierre, additional, Tierney, Jessica E., additional, Valdes, Paul J., additional, Volodin, Evgeny M., additional, Dunkley Jones, Tom, additional, Hollis, Christopher J., additional, Huber, Matthew, additional, and Otto-Bliesner, Bette L., additional
- Published
- 2021
- Full Text
- View/download PDF
128. Large-scale features of Last Interglacial climate: results from evaluating the <i>lig127k</i> simulations for the Coupled Model Intercomparison Project (CMIP6)–Paleoclimate Modeling Intercomparison Project (PMIP4)
- Author
-
Otto-Bliesner, Bette L., primary, Brady, Esther C., additional, Zhao, Anni, additional, Brierley, Chris M., additional, Axford, Yarrow, additional, Capron, Emilie, additional, Govin, Aline, additional, Hoffman, Jeremy S., additional, Isaacs, Elizabeth, additional, Kageyama, Masa, additional, Scussolini, Paolo, additional, Tzedakis, Polychronis C., additional, Williams, Charles J. R., additional, Wolff, Eric, additional, Abe-Ouchi, Ayako, additional, Braconnot, Pascale, additional, Ramos Buarque, Silvana, additional, Cao, Jian, additional, de Vernal, Anne, additional, Guarino, Maria Vittoria, additional, Guo, Chuncheng, additional, LeGrande, Allegra N., additional, Lohmann, Gerrit, additional, Meissner, Katrin J., additional, Menviel, Laurie, additional, Morozova, Polina A., additional, Nisancioglu, Kerim H., additional, O'ishi, Ryouta, additional, Salas y Mélia, David, additional, Shi, Xiaoxu, additional, Sicard, Marie, additional, Sime, Louise, additional, Stepanek, Christian, additional, Tomas, Robert, additional, Volodin, Evgeny, additional, Yeung, Nicholas K. H., additional, Zhang, Qiong, additional, Zhang, Zhongshi, additional, and Zheng, Weipeng, additional
- Published
- 2021
- Full Text
- View/download PDF
129. Challenges and research priorities to understand interactions between climate, ice sheets and global mean sea level during past interglacials
- Author
-
Capron, Emilie, Rovere, Alessio, Austermann, Jacqueline, Axford, Yarrow, Barlow, Natasha L.M., Carlson, Anders E., de Vernal, Anne, Dutton, Andrea, Kopp, Robert E., McManus, Jerry F., Menviel, Laurie, Otto-Bliesner, Bette L., Robinson, Alexander, Shakun, Jeremy D., Tzedakis, Polychronis C., and Wolff, Eric W.
- Published
- 2019
- Full Text
- View/download PDF
130. Evaluation of Arctic warming in mid-Pliocene climate simulations
- Author
-
de Nooijer, Wesley, primary, Zhang, Qiong, additional, Li, Qiang, additional, Zhang, Qiang, additional, Li, Xiangyu, additional, Zhang, Zhongshi, additional, Guo, Chuncheng, additional, Nisancioglu, Kerim H., additional, Haywood, Alan M., additional, Tindall, Julia C., additional, Hunter, Stephen J., additional, Dowsett, Harry J., additional, Stepanek, Christian, additional, Lohmann, Gerrit, additional, Otto-Bliesner, Bette L., additional, Feng, Ran, additional, Sohl, Linda E., additional, Chandler, Mark A., additional, Tan, Ning, additional, Contoux, Camille, additional, Ramstein, Gilles, additional, Baatsen, Michiel L. J., additional, von der Heydt, Anna S., additional, Chandan, Deepak, additional, Peltier, W. Richard, additional, Abe-Ouchi, Ayako, additional, Chan, Wing-Le, additional, Kamae, Youichi, additional, and Brierley, Chris M., additional
- Published
- 2020
- Full Text
- View/download PDF
131. Past climates inform our future
- Author
-
Tierney, Jessica E., primary, Poulsen, Christopher J., additional, Montañez, Isabel P., additional, Bhattacharya, Tripti, additional, Feng, Ran, additional, Ford, Heather L., additional, Hönisch, Bärbel, additional, Inglis, Gordon N., additional, Petersen, Sierra V., additional, Sagoo, Navjit, additional, Tabor, Clay R., additional, Thirumalai, Kaustubh, additional, Zhu, Jiang, additional, Burls, Natalie J., additional, Foster, Gavin L., additional, Goddéris, Yves, additional, Huber, Brian T., additional, Ivany, Linda C., additional, Kirtland Turner, Sandra, additional, Lunt, Daniel J., additional, McElwain, Jennifer C., additional, Mills, Benjamin J. W., additional, Otto-Bliesner, Bette L., additional, Ridgwell, Andy, additional, and Zhang, Yi Ge, additional
- Published
- 2020
- Full Text
- View/download PDF
132. The Pliocene Model Intercomparison Project Phase 2: large-scale climate features and climate sensitivity
- Author
-
Haywood, Alan M., primary, Tindall, Julia C., additional, Dowsett, Harry J., additional, Dolan, Aisling M., additional, Foley, Kevin M., additional, Hunter, Stephen J., additional, Hill, Daniel J., additional, Chan, Wing-Le, additional, Abe-Ouchi, Ayako, additional, Stepanek, Christian, additional, Lohmann, Gerrit, additional, Chandan, Deepak, additional, Peltier, W. Richard, additional, Tan, Ning, additional, Contoux, Camille, additional, Ramstein, Gilles, additional, Li, Xiangyu, additional, Zhang, Zhongshi, additional, Guo, Chuncheng, additional, Nisancioglu, Kerim H., additional, Zhang, Qiong, additional, Li, Qiang, additional, Kamae, Youichi, additional, Chandler, Mark A., additional, Sohl, Linda E., additional, Otto-Bliesner, Bette L., additional, Feng, Ran, additional, Brady, Esther C., additional, von der Heydt, Anna S., additional, Baatsen, Michiel L. J., additional, and Lunt, Daniel J., additional
- Published
- 2020
- Full Text
- View/download PDF
133. A Comparison of the CMIP6 midHolocene and lig127k Simulations in CESM2
- Author
-
Otto‐Bliesner, Bette L., primary, Brady, Esther C., additional, Tomas, Robert A., additional, Albani, Samuel, additional, Bartlein, Patrick J., additional, Mahowald, Natalie M., additional, Shafer, Sarah L., additional, Kluzek, Erik, additional, Lawrence, Peter J., additional, Leguy, Gunter, additional, Rothstein, Mathew, additional, and Sommers, Aleah N., additional
- Published
- 2020
- Full Text
- View/download PDF
134. StableClim, continuous projections of climate stability from 21000 BP to 2100 CE at multiple spatial scales
- Author
-
Brown, Stuart C., primary, Wigley, Tom M. L., additional, Otto-Bliesner, Bette L., additional, and Fordham, Damien A., additional
- Published
- 2020
- Full Text
- View/download PDF
135. Comparison of past and future simulations of ENSO in CMIP5/PMIP3 and CMIP6/PMIP4 models
- Author
-
Brown, Josephine R., primary, Brierley, Chris M., additional, An, Soon-Il, additional, Guarino, Maria-Vittoria, additional, Stevenson, Samantha, additional, Williams, Charles J. R., additional, Zhang, Qiong, additional, Zhao, Anni, additional, Abe-Ouchi, Ayako, additional, Braconnot, Pascale, additional, Brady, Esther C., additional, Chandan, Deepak, additional, D'Agostino, Roberta, additional, Guo, Chuncheng, additional, LeGrande, Allegra N., additional, Lohmann, Gerrit, additional, Morozova, Polina A., additional, Ohgaito, Rumi, additional, O'ishi, Ryouta, additional, Otto-Bliesner, Bette L., additional, Peltier, W. Richard, additional, Shi, Xiaoxu, additional, Sime, Louise, additional, Volodin, Evgeny M., additional, Zhang, Zhongshi, additional, and Zheng, Weipeng, additional
- Published
- 2020
- Full Text
- View/download PDF
136. Mid-Pliocene Atlantic Meridional Overturning Circulation simulated in PlioMIP2
- Author
-
Zhang, Zhongshi, primary, Li, Xiangyu, additional, Guo, Chuncheng, additional, Otterå, Odd Helge, additional, Nisancioglu, Kerim H., additional, Tan, Ning, additional, Contoux, Camille, additional, Ramstein, Gilles, additional, Feng, Ran, additional, Otto-Bliesner, Bette L., additional, Brady, Esther, additional, Chandan, Deepak, additional, Peltier, W. Richard, additional, Baatsen, Michiel L. J., additional, von der Heydt, Anna S., additional, Weiffenbach, Julia E., additional, Stepanek, Christian, additional, Lohmann, Gerrit, additional, Zhang, Qiong, additional, Li, Qiang, additional, Chandler, Mark A., additional, Sohl, Linda E., additional, Haywood, Alan M., additional, Hunter, Stephen J., additional, Tindall, Julia C., additional, Williams, Charles, additional, Lunt, Daniel J., additional, Chan, Wing-Le, additional, and Abe-Ouchi, Ayako, additional
- Published
- 2020
- Full Text
- View/download PDF
137. Global River Discharge and Floods in the Warmer Climate of the Last Interglacial
- Author
-
Scussolini, Paolo, primary, Eilander, Dirk, additional, Sutanudjaja, Edwin H., additional, Ikeuchi, Hiroaki, additional, Hoch, Jannis M., additional, Ward, Philip J., additional, Bakker, Pepijn, additional, Otto‐Bliesner, Bette L., additional, Guo, Chuncheng, additional, Stepanek, Christian, additional, Zhang, Qiong, additional, Braconnot, Pascale, additional, Guarino, Maria‐Vittoria, additional, Muis, Sanne, additional, Yamazaki, Dai, additional, Veldkamp, Ted I. E., additional, and Aerts, Jeroen C. J. H., additional
- Published
- 2020
- Full Text
- View/download PDF
138. Using paleo-archives to safeguard biodiversity under climate change
- Author
-
Fordham, Damien A., primary, Jackson, Stephen T., additional, Brown, Stuart C., additional, Huntley, Brian, additional, Brook, Barry W., additional, Dahl-Jensen, Dorthe, additional, Gilbert, M. Thomas P., additional, Otto-Bliesner, Bette L., additional, Svensson, Anders, additional, Theodoridis, Spyros, additional, Wilmshurst, Janet M., additional, Buettel, Jessie C., additional, Canteri, Elisabetta, additional, McDowell, Matthew, additional, Orlando, Ludovic, additional, Pilowsky, Julia, additional, Rahbek, Carsten, additional, and Nogues-Bravo, David, additional
- Published
- 2020
- Full Text
- View/download PDF
139. Drier tropical and subtropical Southern Hemisphere in the mid-Pliocene Warm Period
- Author
-
Pontes, Gabriel M., primary, Wainer, Ilana, additional, Taschetto, Andréa S., additional, Sen Gupta, Alex, additional, Abe-Ouchi, Ayako, additional, Brady, Esther C., additional, Chan, Wing-Le, additional, Chandan, Deepak, additional, Contoux, Camille, additional, Feng, Ran, additional, Hunter, Stephen J., additional, Kame, Yoichi, additional, Lohmann, Gerrit, additional, Otto-Bliesner, Bette L., additional, Peltier, W. Richard, additional, Stepanek, Christian, additional, Tindall, Julia, additional, Tan, Ning, additional, Zhang, Qiong, additional, and Zhang, Zhongshi, additional
- Published
- 2020
- Full Text
- View/download PDF
140. Increased Climate Response and Earth System Sensitivity From CCSM4 to CESM2 in Mid‐Pliocene Simulations
- Author
-
Feng, Ran, primary, Otto‐Bliesner, Bette L., additional, Brady, Esther C., additional, and Rosenbloom, Nan, additional
- Published
- 2020
- Full Text
- View/download PDF
141. An Efficient Ice Sheet/Earth System Model Spin‐up Procedure for CESM2‐CISM2: Description, Evaluation, and Broader Applicability
- Author
-
Lofverstrom, Marcus, primary, Fyke, Jeremy G., additional, Thayer‐Calder, Katherine, additional, Muntjewerf, Laura, additional, Vizcaino, Miren, additional, Sacks, William J., additional, Lipscomb, William H., additional, Otto‐Bliesner, Bette L., additional, and Bradley, Sarah L., additional
- Published
- 2020
- Full Text
- View/download PDF
142. Response to Reviewer #1
- Author
-
Otto-Bliesner, Bette L., primary
- Published
- 2020
- Full Text
- View/download PDF
143. Response to Reviewer #2
- Author
-
Otto-Bliesner, Bette L., primary
- Published
- 2020
- Full Text
- View/download PDF
144. Supplementary material to "Evaluation of Arctic warming in mid-Pliocene climate simulations"
- Author
-
de Nooijer, Wesley, primary, Zhang, Qiong, additional, Li, Qiang, additional, Zhang, Qiang, additional, Li, Xiangyu, additional, Zhang, Zhongshi, additional, Guo, Chuncheng, additional, Nisancioglu, Kerim H., additional, Haywood, Alan M., additional, Tindall, Julia C., additional, Hunter, Stephen J., additional, Dowsett, Harry J., additional, Stepanek, Christian, additional, Lohmann, Gerrit, additional, Otto-Bliesner, Bette L., additional, Feng, Ran, additional, Sohl, Linda E., additional, Tan, Ning, additional, Contoux, Camille, additional, Ramstein, Gilles, additional, Baatsen, Michiel L. J., additional, von der Heydt, Anna S., additional, Chandan, Deepak, additional, Peltier, W. Richard, additional, Abe-Ouchi, Ayako, additional, Chan, Wing-Le, additional, Kamae, Youichi, additional, and Brierley, Chris M., additional
- Published
- 2020
- Full Text
- View/download PDF
145. CO2 increase experiments using the Community Earth System Model (CESM): Relationship to climate sensitivity and comparison of CESM1 to CESM2
- Author
-
Bacmeister, Julio T., primary, Hannay, Cecile, additional, Medeiros, Brian, additional, Gettelman, Andrew, additional, Neale, Richard, additional, Fredriksen, Hege-Beate, additional, Lipscomb, William H., additional, Simpson, Isla Ruth, additional, Bailey, David Anthony, additional, Holland, Marika M, additional, Lindsay, Keith, additional, and Otto-Bliesner, Bette L, additional
- Published
- 2020
- Full Text
- View/download PDF
146. Assessing Confidence in Pliocene Sea Surface Temperatures to Evaluate Predictive Models
- Author
-
Dowsett, Harry J, Robinson, Marci M, Haywood, Alan M, Hill, Daniel J, Dolan, Aisling. M, Chan, Wing-Le, Abe-Ouchi, Ayako, Chandler, Mark A, Rosenbloom, Nan A, Otto-Bliesner, Bette L, Bragg, Fran J, Lunt, Daniel J, Stoll, Danielle K, Foley, Kevin M, and Riesselman, Christina
- Subjects
Meteorology And Climatology - Abstract
In light of mounting empirical evidence that planetary warming is well underway, the climate research community looks to palaeoclimate research for a ground-truthing measure with which to test the accuracy of future climate simulations. Model experiments that attempt to simulate climates of the past serve to identify both similarities and differences between two climate states and, when compared with simulations run by other models and with geological data, to identify model-specific biases. Uncertainties associated with both the data and the models must be considered in such an exercise. The most recent period of sustained global warmth similar to what is projected for the near future occurred about 3.33.0 million years ago, during the Pliocene epoch. Here, we present Pliocene sea surface temperature data, newly characterized in terms of level of confidence, along with initial experimental results from four climate models. We conclude that, in terms of sea surface temperature, models are in good agreement with estimates of Pliocene sea surface temperature in most regions except the North Atlantic. Our analysis indicates that the discrepancy between the Pliocene proxy data and model simulations in the mid-latitudes of the North Atlantic, where models underestimate warming shown by our highest-confidence data, may provide a new perspective and insight into the predictive abilities of these models in simulating a past warm interval in Earth history.This is important because the Pliocene has a number of parallels to present predictions of late twenty-first century climate.
- Published
- 2012
- Full Text
- View/download PDF
147. Unraveling the mechanisms and implications of a stronger mid-Pliocene AMOC in PlioMIP2.
- Author
-
Weiffenbach, Julia E., Baatsen, Michiel L. J., Dijkstra, Henk A., von der Heydt, Anna S., Ayako Abe-Ouchi, Brady, Esther C., Wing-Le Chan, Chandan, Deepak, Chandler, Mark A., Contoux, Camille, Ran Feng, Chuncheng Guo, Zixuan Han, Haywood, Alan M., Qiang Li, Xiangyu Li, Lohmann, Gerrit, Lunt, Daniel J., Nisancioglu, Kerim H., and Otto-Bliesner, Bette L.
- Abstract
The mid-Pliocene warm period (3.264-3.025 Ma) is the most recent geological period in which the atmospheric CO2 concentration was approximately equal to the concentration we measure today (ca. 400 ppm). Sea surface temperature (SST) proxies indicate above-average warming over the North Atlantic in the mid-Pliocene with respect to the pre-industrial period, which may be linked to an intensified Atlantic Meridional Overturning Circulation (AMOC). Earlier results from the Pliocene 5 Model Intercomparison Project Phase 2 (PlioMIP2) show that the ensemble simulates a stronger AMOC in the mid-Pliocene than in the pre-industrial. However, no consistent relationship between the stronger mid-Pliocene AMOC and either the Atlantic northward ocean heat transport (OHT) or average North Atlantic SSTs has been found. In this study, we look further into the drivers and consequences of a stronger AMOC in mid-Pliocene compared to pre-industrial simulations in PlioMIP2. We find that all model simulations with a closed Bering Strait and Canadian Archipelago show reduced freshwater transport from the Arctic Ocean into the North Atlantic. The resulting increase in salinity in the subpolar North Atlantic and Labrador Sea drives the stronger AMOC in the mid-Pliocene. To investigate the dynamics behind the ensemble's variable response of the total Atlantic OHT to the stronger AMOC, we separate the Atlantic OHT into two components associated with either the overturning circulation or the wind-driven gyre circulation. While the ensemble mean of the overturning component increased significantly in magnitude in the mid-Pliocene, it is partly compensated by a reduction of the gyre component in the northern subtropical gyre region. This indicates that the lack of relationship between the total OHT and AMOC is due to changes in OHT by the subtropical gyre. The overturning and gyre components should therefore be considered separately to gain a more complete understanding of the OHT response to a stronger mid-Pliocene AMOC. In addition, we show that the AMOC exerts a stronger influence on North Atlantic SSTs in the mid-Pliocene than in the pre-industrial, providing a possible explanation for the improved agreement of the PlioMIP2 ensemble mean SSTs with reconstructions in the North Atlantic. [ABSTRACT FROM AUTHOR]
- Published
- 2022
- Full Text
- View/download PDF
148. Past terrestrial hydroclimate sensitivity controlled by Earth system feedbacks.
- Author
-
Feng, Ran, Bhattacharya, Tripti, Otto-Bliesner, Bette L., Brady, Esther C., Haywood, Alan M., Tindall, Julia C., Hunter, Stephen J., Abe-Ouchi, Ayako, Chan, Wing-Le, Kageyama, Masa, Contoux, Camille, Guo, Chuncheng, Li, Xiangyu, Lohmann, Gerrit, Stepanek, Christian, Tan, Ning, Zhang, Qiong, Zhang, Zhongshi, Han, Zixuan, and Williams, Charles J. R.
- Subjects
FEEDBACK control systems ,ICE sheets ,WEATHER ,RADIATIVE forcing ,STANDING waves ,PLIOCENE Epoch - Abstract
Despite tectonic conditions and atmospheric CO
2 levels (pCO2 ) similar to those of present-day, geological reconstructions from the mid-Pliocene (3.3-3.0 Ma) document high lake levels in the Sahel and mesic conditions in subtropical Eurasia, suggesting drastic reorganizations of subtropical terrestrial hydroclimate during this interval. Here, using a compilation of proxy data and multi-model paleoclimate simulations, we show that the mid-Pliocene hydroclimate state is not driven by direct CO2 radiative forcing but by a loss of northern high-latitude ice sheets and continental greening. These ice sheet and vegetation changes are long-term Earth system feedbacks to elevated pCO2 . Further, the moist conditions in the Sahel and subtropical Eurasia during the mid-Pliocene are a product of enhanced tropospheric humidity and a stationary wave response to the surface warming pattern, which varies strongly with land cover changes. These findings highlight the potential for amplified terrestrial hydroclimate responses over long timescales to a sustained CO2 forcing. In contrast to future projections, paleoclimate records often find wetter subtropics in tandem with elevated CO2 . Here, a compilation of proxies and simulations are used to reveal the climate dynamics and feedbacks responsible for generating wet subtropics during the mid-Pliocene. [ABSTRACT FROM AUTHOR]- Published
- 2022
- Full Text
- View/download PDF
149. Lessons from a high-CO2 world: an ocean view from ~ 3 million years ago
- Author
-
McClymont, Erin L., Ford, Heather L., Ho, Sze Ling, Tindall, Julia C., Haywood, Alan M., Alonso-Garcia, Montserrat, Bailey, Ian, Berke, Melissa A., Littler, Kate, Patterson, Molly O., Petrick, Benjamin, Peterse, Francien, Ravelo, A. Christina, Risebrobakken, Bjørg, De Schepper, Stijn, Swann, George E. A., Thirumalai, Kaustubh, Tierney, Jessica E., van der Weijst, Carolien, White, Sarah, Abe-Ouchi, Ayako, Baatsen, Michiel L. J., Brady, Esther C., Chan, Wing-Le, Chandan, Deepak, Feng, Ran, Guo, Chuncheng, von der Heydt, Anna S., Hunter, Stephen, Li, Xiangyi, Lohmann, Gerrit, Nisancioglu, Kerim H., Otto-Bliesner, Bette L., Peltier, W. Richard, Stepanek, Christian, and Zhang, Zhongshi
- Abstract
A range of future climate scenarios are projected for high atmospheric CO2 concentrations, given uncertainties over future human actions as well as potential environmental and climatic feedbacks. The geological record offers an opportunity to understand climate system response to a range of forcings and feedbacks which operate over multiple temporal and spatial scales. Here, we examine a single interglacial during the late Pliocene (KM5c, ca. 3:205 0:01 Ma) when atmospheric CO2 exceeded pre-industrial concentrations, but were similar to today and to the lowest emission scenarios for this century. As orbital forcing and continental configurations were almost identical to today, we are able to focus on equilibrium climate system response to modern and near-future CO2. Using proxy data from 32 sites, we demonstrate that global mean sea-surface temperatures were warmer than pre-industrial values, by 2:3 C for the combined proxy data (foraminifera Mg=Ca and alkenones), or by 3:2–3.4 C (alkenones only). Compared to the preindustrial period, reduced meridional gradients and enhanced warming in the North Atlantic are consistently reconstructed. There is broad agreement between data and models at the global scale, with regional differences reflecting ocean circulation and/or proxy signals. An uneven distribution of proxy data in time and space does, however, add uncertainty to our anomaly calculations. The reconstructed global mean seasurface temperature anomaly for KM5c is warmer than all but three of the PlioMIP2 model outputs, and the reconstructed North Atlantic data tend to align with the warmest KM5c model values. Our results demonstrate that even under low-CO2 emission scenarios, surface ocean warming may be expected to exceed model projections and will be accentuated in the higher latitudes. FCT: SFRH/BPD/96960/2013, PTDC/MAR-PRO/3396/2014, CCMAR UID/Multi/04326/2019 info:eu-repo/semantics/publishedVersion
- Published
- 2020
150. What can Palaeoclimate Modelling do for you?
- Author
-
Haywood, Alan M., Valdes, Paul J., Aze, Tracy, Barlow, N, Burke, A, Dolan, Aisling M., von der Heydt, A.S., Hill, Daniel J., Jamieson, S.S.R., Otto-bliesner, Bette L., Salzmann, Ulrich, Saupe, E, Voss, Jochen, Sub Physical Oceanography, Marine and Atmospheric Research, Sub Physical Oceanography, and Marine and Atmospheric Research
- Subjects
Global and Planetary Change ,Environmental change ,Management science ,Computer science ,Climate ,Earth history ,020207 software engineering ,Geology ,Global change ,F800 ,02 engineering and technology ,Environmental Science (miscellaneous) ,Palaeoclimate ,Natural (archaeology) ,Multidisciplinary approach ,Anthropocene ,Social system ,Environmental engineering science ,0202 electrical engineering, electronic engineering, information engineering ,Economic Geology ,Computers in Earth Sciences ,Resilience (network) ,Model - Abstract
In modern environmental and climate science it is necessary to assimilate observational datasets collected over decades with outputs from numerical models, to enable a full understanding of natural systems and their sensitivities. During the twentieth and twenty-first centuries, numerical modelling became central to many areas of science from the Bohr model of the atom to the Lorenz model of the atmosphere. In modern science, a great deal of time and effort is devoted to developing, evaluating, comparing and modifying numerical models that help us synthesise our understanding of complex natural systems. Here we provide an assessment of the contribution of past (palaeo) climate modelling to multidisciplinary science and to society by answering the following question: What can palaeoclimate modelling do for you? We provide an assessment of how palaeoclimate modelling can develop in the future to further enhance multidisciplinary research that aims to understand Earth’s evolution, and what this may tell us about the resilience of natural and social systems as we enter the Anthropocene.
- Published
- 2019
- Full Text
- View/download PDF
Catalog
Discovery Service for Jio Institute Digital Library
For full access to our library's resources, please sign in.