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605 results on '"Braconnot, Pascale"'

7. An Introduction to the Holocene and Anthropic Disturbance

Author

Braconnot, Pascale, Yiou, Pascal, Brun, J. P., Series Editor, Oncken, Onno, Series Editor, Weissert, Helmut, Series Editor, Dullo, Wolf-Christian, Series Editor, Ramstein, Gilles, editor, Landais, Amaëlle, editor, Bouttes, Nathaelle, editor, Sepulchre, Pierre, editor, Govin, Aline, editor, and Minnock, Mary, Translated by

Published
2021
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8. Global energetics and local physics as drivers of past, present and future monsoons

Author

Biasutti, Michela, Voigt, Aiko, Boos, William R, Braconnot, Pascale, Hargreaves, Julia C, Harrison, Sandy P, Kang, Sarah M, Mapes, Brian E, Scheff, Jacob, Schumacher, Courtney, Sobel, Adam H, and Xie, Shang-Ping

Subjects
Climate Action, Meteorology & Atmospheric Sciences
Abstract

Global constraints on momentum and energy govern the variability of the rainfall belt in the intertropical convergence zone and the structure of the zonal mean tropical circulation. The continental-scale monsoon systems are also facets of a momentum- and energy-constrained global circulation, but their modern and palaeo variability deviates substantially from that of the intertropical convergence zone. The mechanisms underlying deviations from expectations based on the longitudinal mean budgets are neither fully understood nor simulated accurately. We argue that a framework grounded in global constraints on energy and momentum yet encompassing the complexities of monsoon dynamics is needed to identify the causes of the mismatch between theory, models and observations, and ultimately to improve regional climate projections. In a first step towards this goal, disparate regional processes must be distilled into gross measures of energy flow in and out of continents and between the surface and the tropopause, so that monsoon dynamics may be coherently diagnosed across modern and palaeo observations and across idealized and comprehensive simulations. Accounting for zonal asymmetries in the circulation, land/ocean differences in surface fluxes, and the character of convective systems, such a monsoon framework would integrate our understanding at all relevant scales: from the fine details of how moisture and energy are lifted in the updrafts of thunderclouds, up to the global circulations.

Published
2018

9. Global biosphere productivity changes during Heinrich Stadial 4: Preliminary results from the triple isotope composition of air oxygen and numerical simulation using a coupled climate model

Author

Yang, Ji-Woong, primary, Ladant, Jean-Baptiste, additional, Landais, Amaëlle, additional, Kageyama, Masa, additional, Blunier, Thomas, additional, Jaccard, Samuel, additional, Duchamp-Alphonse, Stéphanie, additional, Braconnot, Pascale, additional, Viovy, Nicolas, additional, Crinella-Morici, Louise, additional, and Prié, Frédéric, additional

Published
2024
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12. High-resolution marine data and transient simulations support orbital forcing of ENSO amplitude since the mid-Holocene

Author

Carré, Matthieu, Braconnot, Pascale, Elliot, Mary, d’Agostino, Roberta, Schurer, Andrew, Shi, Xiaoxu, Marti, Olivier, Lohmann, Gerrit, Jungclaus, Johann, Cheddadi, Rachid, Abdelkader di Carlo, Isma, Cardich, Jorge, Ochoa, Diana, Salas Gismondi, Rodolfo, Pérez, Alexander, Romero, Pedro E., Turcq, Bruno, Corrège, Thierry, and Harrison, Sandy P.

Published
2021
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13. Bringing it all together: Science and modelling priorities to support international climate policy

Author

Jones, Colin Gareth, primary, Adloff, Fanny, additional, Booth, Ben, additional, Cox, Peter, additional, Eyring, Veronika, additional, Friedlingstein, Pierre, additional, Frieler, Katja, additional, Hewitt, Helene, additional, Jeffery, Hazel, additional, Joussaume, Sylvie, additional, Koenigk, Torben, additional, Lawrence, Bryan N., additional, O'Rourke, Eleanor, additional, Roberts, Malcolm, additional, Sanderson, Benjamin, additional, Séférian, Roland, additional, Somot, Samuel, additional, Vidale, Pier-Luigi, additional, van Vuuren, Detlef, additional, Acosta, Mario, additional, Bentsen, Mats, additional, Bernardello, Raffaele, additional, Betts, Richard, additional, Blockley, Ed, additional, Boé, Julien, additional, Bracegirdle, Tom, additional, Braconnot, Pascale, additional, Brovkin, Victor, additional, Buontempo, Carlo, additional, Doblas-Reyes, Francisco J., additional, Donat, Markus G., additional, Epicoco, Italo, additional, Falloon, Pete, additional, Fiore, Sandro, additional, Froelicher, Thomas, additional, Fuckar, Neven, additional, Gidden, Matthew, additional, Goessling, Helge, additional, Graversen, Rune Grand, additional, Gualdi, Silvio, additional, Gutiérrez, Jose Manuel, additional, Ilyina, Tatiana, additional, Jacob, Daniela, additional, Jones, Chris, additional, Juckes, Martin, additional, Kendon, Elizabeth, additional, Kjellström, Erik, additional, Knutti, Reto, additional, Lowe, Jason A., additional, Mizielinski, Matthew, additional, Nassisi, Paola, additional, Obersteiner, Michael, additional, Regnier, Pierre, additional, Roehrig, Romain, additional, Salas y Melia, David, additional, Schleussner, Carl-Friedrich, additional, Schulz, Michael, additional, Scoccimarro, Enrico, additional, Terray, Laurent, additional, Thiemann, Hannes, additional, Wood, Richard, additional, Yang, Shuting, additional, and Zaehle, Sönke, additional

Published
2024
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15. Understanding ENSO Diversity

Author

Capotondi, Antonietta, Wittenberg, Andrew T, Newman, Matthew, Di Lorenzo, Emanuele, Yu, Jin-Yi, Braconnot, Pascale, Cole, Julia, Dewitte, Boris, Giese, Benjamin, Guilyardi, Eric, Jin, Fei-Fei, Karnauskas, Kristopher, Kirtman, Benjamin, Lee, Tong, Schneider, Niklas, Xue, Yan, and Yeh, Sang-Wook

Subjects
Astronomical and Space Sciences, Atmospheric Sciences, Physical Geography and Environmental Geoscience, Meteorology & Atmospheric Sciences
Abstract

Improved determination of ENSO predictability, teleconnections, and impacts requires a better understanding of event-to-event differences in ENSO spatial patterns and evolution.

Published
2015

18. A frequency-optimised temperature record for the Holocene

Author

Essell, Helen, primary, Krusic, Paul J, additional, Esper, Jan, additional, Wagner, Sebastian, additional, Braconnot, Pascale, additional, Jungclaus, Johann, additional, Muschitiello, Francesco, additional, Oppenheimer, Clive, additional, and Büntgen, Ulf, additional

Published
2023
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29. No Consistent Simulated Trends in the Atlantic Meridional Overturning Circulation for the Past 6,000 Years

Author

Jiang, Zhiyi, primary, Brierley, Chris M., additional, Bader, Jürgen, additional, Braconnot, Pascale, additional, Erb, Michael, additional, Hopcroft, Peter O., additional, Jiang, Dabang, additional, Jungclaus, Johann, additional, Khon, Vyacheslav, additional, Lohmann, Gerrit, additional, Marti, Olivier, additional, Osman, Matthew B., additional, Otto‐Bliesner, Bette, additional, Schneider, Birgit, additional, Shi, Xiaoxu, additional, Thornalley, David J. R., additional, Tian, Zhiping, additional, and Zhang, Qiong, additional

Published
2023
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30. No Consistent Simulated Trends in the Atlantic Meridional Overturning Circulation for the Past 6,000 Years

Author

Jiang, Zhiyi, Brierley, Chris M., Bader, Jürgen, Braconnot, Pascale, Erb, Michael, Hopcroft, Peter O., Jiang, Dabang, Jungclaus, Johann, Khon, Vyacheslav, Lohmann, Gerrit, Marti, Olivier, Osman, Matthew B., Otto‐Bliesner, Bette, Schneider, Birgit, Shi, Xiaoxu, Thornalley, David J. R., Tian, Zhiping, Zhang, Qiong, Jiang, Zhiyi, Brierley, Chris M., Bader, Jürgen, Braconnot, Pascale, Erb, Michael, Hopcroft, Peter O., Jiang, Dabang, Jungclaus, Johann, Khon, Vyacheslav, Lohmann, Gerrit, Marti, Olivier, Osman, Matthew B., Otto‐Bliesner, Bette, Schneider, Birgit, Shi, Xiaoxu, Thornalley, David J. R., Tian, Zhiping, and Zhang, Qiong

Abstract

The Atlantic Meridional Overturning Circulation (AMOC) is a key feature of the North Atlantic with global ocean impacts. The AMOC's response to past changes in forcings during the Holocene provides important context for the coming centuries. Here, we investigate AMOC trends using an emerging set of transient simulations using multiple global climate models for the past 6,000 years. Although some models show changes, no consistent trend in overall AMOC strength during the mid-to-late Holocene emerges from the ensemble. We interpret this result to suggest no overall change in AMOC, which fits with our assessment of available proxy reconstructions. The decadal variability of the AMOC does not change in ensemble during the mid- and late-Holocene. There are interesting AMOC changes seen in the early Holocene, but their nature depends a lot on which inputs are used to drive the experiment.

Published
2023
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32. Introducing the French national programme TRACCS: TRAnsformative Advances in Climate modelling for Climate Services

Author

Kageyama, Masa, primary, Morin, Samuel, additional, Anquetin, Sandrine, additional, de Noblet, Nathalie, additional, Terray, Laurent, additional, Boucher, Olivier, additional, Deshayes, Julie, additional, Durand, Gaël, additional, Salas y Mélia, David, additional, Bouilloud, Ludovic, additional, and Braconnot, Pascale, additional

Published
2023
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45. The PMIP4 Contribution to CMIP6 - Part 1: Overview and Over-Arching Analysis Plan

Author

Kageyama, Masa, Braconnot, Pascale, Harrison, Sandy P, Haywood, Alan M, Jungclaus, Johann H, Otto-Bliesner, Bette L, Peterschmitt, Jean-Yves, Abe-Ouchi, Ayako, Albani, Samuel, Bartlein, Patrick J, Brierley, Chris, Crucifix, Michel, Dolan, Aisling, Fernandez-Donado, Laura, Fischer, Hubertus, Hopcroft, Peter O, Ivanovic, Ruza F, Lambert, Fabrice, Lunt, Daniel J, Mahowald, Natalie M, Peltier, W. Richard, Phipps, Steven J, Roche, Didier M, Schmidt, Gavin A, Tarasov, Lev, Valdes, Paul J, Zhang, Qiong, and Zhou, Tianjun

Subjects
Geophysics, Meteorology And Climatology
Abstract

This paper is the first of a series of four GMD (Geoscientific Model Development) papers on the PMIP4-CMIP6 (Paleoclimate Modelling Intercomparison Project - Phase 4 -- Coupled Model Intercomparison Project - Phase 6) experiments. Part 2 (Otto-Bliesner et al., 2017) gives details about the two PMIP4-CMIP6 interglacial experiments, Part 3 (Jungclaus et al., 2017) about the last millennium experiment, and Part 4 (Kageyama et al., 2017) about the Last Glacial Maximum experiment. The mid-Pliocene Warm Period experiment is part of the Pliocene Model Intercomparison Project (PlioMIP) - Phase 2, detailed in Haywood et al. (2016). The goal of the Paleoclimate Modelling Intercomparison Project (PMIP) is to understand the response of the climate system to different climate forcings for documented climatic states very different from the present and historical climates. Through comparison with observations of the environmental impact of these climate changes, or with climate reconstructions based on physical, chemical, or biological records, PMIP also addresses the issue of how well state-of-the-art numerical models simulate climate change. Climate models are usually developed using the present and historical climates as references, but climate projections show that future climates will lie well outside these conditions. Palaeoclimates very different from these reference states therefore provide stringent tests for state-of-the-art models and a way to assess whether their sensitivity to forcings is compatible with palaeoclimatic evidence. Simulations of five different periods have been designed to address the objectives of the sixth phase of the Coupled Model Intercomparison Project (CMIP6): the millennium prior to the industrial epoch (CMIP6 name: past1000); the mid-Holocene, 6000 years ago (midHolocene); the Last Glacial Maximum, 21,000 years ago (lgm); the Last Interglacial, 127,000 years ago (lig127k); and the mid-Pliocene Warm Period, 3.2 million years ago (midPliocene-eoi400). These climatic periods are well documented by palaeoclimatic and palaeoenvironmental records, with climate and environmental changes relevant for the study and projection of future climate changes. This paper describes the motivation for the choice of these periods and the design of the numerical experiments and database requests, with a focus on their novel features compared to the experiments performed in previous phases of PMIP and CMIP. It also outlines the analysis plan that takes advantage of the comparisons of the results across periods and across CMIP6 in collaboration with other MIPs.

Published
2018
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48. Recent developments in Holocene climate modelling

Author

Renssen, Hans, Braconnot, Pascale, Tett, Simon F. B., Von Storch, Hans, Weber, S. L., Smol, John P., editor, Last, William M., editor, Battarbee, Richard W., editor, Gasse, Françoise, editor, and Stickley, Catherine E., editor

Published
2004
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50. Calendar effects on surface air temperature and precipitation based on model-ensemble equilibrium and transient simulations from PMIP4 and PACMEDY

Author

Shi, Xiaoxu, Werner, Martin, Krug, Carolin, Brierley, Chris M, Zhao, Anni, Igbinosa, Endurance, Braconnot, Pascale, Brady, Esther, Cao, Jian, d'Agostino, Roberta, Jungclaus, Johann, Liu, Xingxing, Otto-Bliesner, Bette, Sidorenko, Dmitry, Tomas, Robert, Volodin, Evgeny M., Yang, Hu, Zhang, Qiong, Zheng, Weipeng, Lohmann, Gerrit, Shi, Xiaoxu, Werner, Martin, Krug, Carolin, Brierley, Chris M, Zhao, Anni, Igbinosa, Endurance, Braconnot, Pascale, Brady, Esther, Cao, Jian, d'Agostino, Roberta, Jungclaus, Johann, Liu, Xingxing, Otto-Bliesner, Bette, Sidorenko, Dmitry, Tomas, Robert, Volodin, Evgeny M., Yang, Hu, Zhang, Qiong, Zheng, Weipeng, and Lohmann, Gerrit

Abstract

Numerical modeling enables a comprehensive understanding not only of the Earth's system today, but also of the past. To date, a significant amount of time and effort has been devoted to paleoclimate modeling and analysis, which involves the latest and most advanced Paleoclimate Modelling Intercomparison Project phase 4 (PMIP4). The definition of seasonality, which is influenced by slow variations in the Earth's orbital parameters, plays a key role in determining the calculated seasonal cycle of the climate. In contrast to the classical calendar used today, where the lengths of the months and seasons are fixed, the angular calendar calculates the lengths of the months and seasons according to a fixed number of degrees along the Earth's orbit. When comparing simulation results for different time intervals, it is essential to account for the angular calendar to ensure that the data for comparison are from the same position along the Earth's orbit. Most models use the classical calendar, which can lead to strong distortions of the monthly and seasonal values, especially for the climate of the past. Here, by analyzing daily outputs from multiple PMIP4 model simulations, we examine calendar effects on surface air temperature and precipitation under mid-Holocene, Last Interglacial, and pre-industrial climate conditions. We came to the following conclusions. (a) The largest cooling bias occurs in boreal autumn when the classical calendar is applied for the mid-Holocene and Last Interglacial, due to the fact that the vernal equinox is fixed on 21 March. (b) The sign of the temperature anomalies between the Last Interglacial and pre-industrial in boreal autumn can be reversed after the switch from the classical to angular calendar, particularly over the Northern Hemisphere continents. (c) Precipitation over West Africa is overestimated in boreal summer and underestimated in boreal autumn when the classical seasonal cycle is applied. (d) Finally, month-length adjusted values f

Published
2022

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