146 results on '"Felis, T."'
Search Results
2. Improved constraints on open-system processes in fossil reef corals by combined Th/U, Pa/U and Ra/Th dating: A case study from Aqaba, Jordan
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Obert, J. Christina, Scholz, D., Felis, T., Lippold, J., Jochum, Klaus P., and Andreae, Meinrat O.
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- 2019
- Full Text
- View/download PDF
3. Reconstructing ultra-high-resolution climate variability and symbiont bleaching in tropical corals: Introducing a multi-proxy approach
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Meiritz, Luisa, Deusner, Christian, Fietzke, Jan, Santodomingo, N., Felis, T., Anagnostou, Eleni, Meiritz, Luisa, Deusner, Christian, Fietzke, Jan, Santodomingo, N., Felis, T., and Anagnostou, Eleni
- Published
- 2023
4. Climate Records from Corals
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Felis, T., Pätzold, J., Wefer, Gerold, editor, Lamy, Frank, editor, and Mantoura, Fauzi, editor
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- 2003
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- View/download PDF
5. Unified methods in collecting, preserving, and archiving coral bleaching and restoration specimens to increase sample utility and interdisciplinary collaboration.
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Vega Thurber, R, Schmeltzer, ER, Grottoli, AG, van Woesik, R, Toonen, RJ, Warner, M, Dobson, KL, McLachlan, RH, Barott, K, Barshis, DJ, Baumann, J, Chapron, L, Combosch, DJ, Correa, AM, DeCarlo, TM, Hagedorn, M, Hédouin, L, Hoadley, K, Felis, T, Ferrier-Pagès, C, Kenkel, C, Kuffner, IB, Matthews, J, Medina, M, Meyer, C, Oster, C, Price, J, Putnam, HM, Sawall, Y, Vega Thurber, R, Schmeltzer, ER, Grottoli, AG, van Woesik, R, Toonen, RJ, Warner, M, Dobson, KL, McLachlan, RH, Barott, K, Barshis, DJ, Baumann, J, Chapron, L, Combosch, DJ, Correa, AM, DeCarlo, TM, Hagedorn, M, Hédouin, L, Hoadley, K, Felis, T, Ferrier-Pagès, C, Kenkel, C, Kuffner, IB, Matthews, J, Medina, M, Meyer, C, Oster, C, Price, J, Putnam, HM, and Sawall, Y
- Abstract
Coral reefs are declining worldwide primarily because of bleaching and subsequent mortality resulting from thermal stress. Currently, extensive efforts to engage in more holistic research and restoration endeavors have considerably expanded the techniques applied to examine coral samples. Despite such advances, coral bleaching and restoration studies are often conducted within a specific disciplinary focus, where specimens are collected, preserved, and archived in ways that are not always conducive to further downstream analyses by specialists in other disciplines. This approach may prevent the full utilization of unexpended specimens, leading to siloed research, duplicative efforts, unnecessary loss of additional corals to research endeavors, and overall increased costs. A recent US National Science Foundation-sponsored workshop set out to consolidate our collective knowledge across the disciplines of Omics, Physiology, and Microscopy and Imaging regarding the methods used for coral sample collection, preservation, and archiving. Here, we highlight knowledge gaps and propose some simple steps for collecting, preserving, and archiving coral-bleaching specimens that can increase the impact of individual coral bleaching and restoration studies, as well as foster additional analyses and future discoveries through collaboration. Rapid freezing of samples in liquid nitrogen or placing at -80 °C to -20 °C is optimal for most Omics and Physiology studies with a few exceptions; however, freezing samples removes the potential for many Microscopy and Imaging-based analyses due to the alteration of tissue integrity during freezing. For Microscopy and Imaging, samples are best stored in aldehydes. The use of sterile gloves and receptacles during collection supports the downstream analysis of host-associated bacterial and viral communities which are particularly germane to disease and restoration efforts. Across all disciplines, the use of aseptic techniques during collection, p
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- 2022
6. Shift in ENSO Teleconnections Recorded by a Northern Red Sea Coral
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Rimbu, N., Lohmann, G., Felis, T., and Pätzold, J.
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- 2003
7. A review of last interglacial sea-level proxies in the western Atlantic and southwestern Caribbean, from Brazil to Honduras
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Rubio-Sandoval, K., Rovere, A., Cerrone, C., Stocchi, P., Lorscheid, T, Felis, T., Petersen, A.-K., Ryan, D.D., Rubio-Sandoval, K., Rovere, A., Cerrone, C., Stocchi, P., Lorscheid, T, Felis, T., Petersen, A.-K., and Ryan, D.D.
- Abstract
We use a standardized template for Pleistocene sea-level data to review last interglacial (Marine Isotope Stage 5 - MIS 5) sea-level indicators along the coasts of the western Atlantic and southwestern Caribbean, on a transect spanning from Brazil to Honduras and including the islands of Aruba, Bonaire, and Curaçao. We identified six main types of sea-level indicators (beach deposits, coral reef terraces, lagoonal deposits, marine terraces, Ophiomorpha burrows, and tidal notches) and produced 55 standardized data points, each constrained by one or more geochronological methods. Sea-level indicators are well preserved along the Brazilian coasts, providing an almost continuous north-to-south transect. However, this continuity disappears north of the Rio Grande do Norte Brazilian state. According to the sea-level index points (discrete past position of relative sea level in space and time) the paleo sea-level values range from ~5.6 to 20m above sea level (a.s.l.) in the continental sector and from ~2 to 10ma.s.l. in the Caribbean islands. In this paper, we address the uncertainties surrounding these values. From our review, we identify that the coasts of northern Brazil, French Guiana, Suriname, Guyana, and Venezuela would benefit from a renewed study of Pleistocene sea-level indicators, as it was not possible to identify sea-level index points for the last interglacial coastal outcrops of these countries. Future research must also be directed at improving the chronological control at several locations, and several sites would benefit from the re-measurement of sea-level index points using more accurate elevation measurement techniques. The database compiled in this study is available in spreadsheet format at the following link: https://doi.org/10.5281/zenodo.5516444
- Published
- 2021
8. Tides in the Last Interglacial: insights from notch geometry and palaeo tidal models in Bonaire, Netherland Antilles
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Lorscheid, T, Felis, T., Stocchi, P., Obert, J.C., Scholz, D., and Rovere, A.
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lcsh:R ,Settore GEO/04 - Geografia Fisica e Geomorfologia ,lcsh:Medicine ,lcsh:Q ,lcsh:Science ,Article - Abstract
The study of past sea levels relies largely on the interpretation of sea-level indicators. Palaeo tidal notches are considered as one of the most precise sea-level indicators as their formation is closely tied to the local tidal range. We present geometric measurements of modern and palaeo (Marine Isotope Stage (MIS) 5e) tidal notches on Bonaire (southern Caribbean Sea) and results from two tidal simulations, using the present-day bathymetry and a palaeo-bathymetry. We use these two tools to investigate changes in the tidal range since MIS 5e. Our models show that the tidal range changes most significantly in shallow areas, whereas both, notch geometry and models results, suggest that steeper continental shelves, such as the ones bordering the island of Bonaire, are less affected to changes in tidal range in conditions of MIS 5e sea levels. We use our data and results to discuss the importance of considering changes in tidal range while reconstructing MIS 5e sea level histories, and we remark that it is possible to use hydrodynamic modelling and notch geometry as first-order proxies to assess whether, in a particular area, tidal range might have been different in MIS 5e with respect to today.
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- 2017
9. Mean oxygen-isotope signatures in Porites spp. corals: inter-colony variability and correction for extension-rate effects
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Felis, T., Pätzold, J., and Loya, Y.
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- 2003
- Full Text
- View/download PDF
10. PaCTS 1.0: A Crowdsourced Reporting Standard for Paleoclimate Data
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Khider, D, Emile-Geay, J, McKay, NP, Gil, Y, Garijo, D, Ratnakar, V, Alonso-Garcia, M, Bertrand, S, Bothe, O, Brewer, P, Bunn, A, Chevalier, M, Comas-Bru, L, Csank, A, Dassié, E, DeLong, K, Felis, T, Francus, P, Frappier, A, Gray, W, Goring, S, Jonkers, L, Kahle, M, Kaufman, D, Kehrwald, NM, Martrat, B, McGregor, H, Richey, J, Schmittner, A, Scroxton, N, Sutherland, E, Thirumalai, K, Allen, K, Arnaud, F, Axford, Y, Barrows, T, Bazin, L, Pilaar Birch, SE, Bradley, E, Bregy, J, Capron, E, Cartapanis, O, Chiang, HW, Cobb, KM, Debret, M, Dommain, R, Du, J, Dyez, K, Emerick, S, Erb, MP, Falster, G, Finsinger, W, Fortier, D, Gauthier, N, George, S, Grimm, E, Hertzberg, J, Hibbert, F, Hillman, A, Hobbs, W, Huber, M, Hughes, ALC, Jaccard, S, Ruan, J, Kienast, M, Konecky, B, Le Roux, G, Lyubchich, V, Novello, VF, Olaka, L, Partin, JW, Pearce, C, Phipps, SJ, Pignol, C, Piotrowska, N, Poli, MS, Prokopenko, A, Schwanck, F, Stepanek, C, Swann, GEA, Telford, R, Thomas, E, Thomas, Z, Truebe, S, von Gunten, L, Waite, A, Weitzel, N, Wilhelm, B, Williams, J, Williams, JJ, Winstrup, M, Zhao, N, Zhou, Y, Khider, D, Emile-Geay, J, McKay, NP, Gil, Y, Garijo, D, Ratnakar, V, Alonso-Garcia, M, Bertrand, S, Bothe, O, Brewer, P, Bunn, A, Chevalier, M, Comas-Bru, L, Csank, A, Dassié, E, DeLong, K, Felis, T, Francus, P, Frappier, A, Gray, W, Goring, S, Jonkers, L, Kahle, M, Kaufman, D, Kehrwald, NM, Martrat, B, McGregor, H, Richey, J, Schmittner, A, Scroxton, N, Sutherland, E, Thirumalai, K, Allen, K, Arnaud, F, Axford, Y, Barrows, T, Bazin, L, Pilaar Birch, SE, Bradley, E, Bregy, J, Capron, E, Cartapanis, O, Chiang, HW, Cobb, KM, Debret, M, Dommain, R, Du, J, Dyez, K, Emerick, S, Erb, MP, Falster, G, Finsinger, W, Fortier, D, Gauthier, N, George, S, Grimm, E, Hertzberg, J, Hibbert, F, Hillman, A, Hobbs, W, Huber, M, Hughes, ALC, Jaccard, S, Ruan, J, Kienast, M, Konecky, B, Le Roux, G, Lyubchich, V, Novello, VF, Olaka, L, Partin, JW, Pearce, C, Phipps, SJ, Pignol, C, Piotrowska, N, Poli, MS, Prokopenko, A, Schwanck, F, Stepanek, C, Swann, GEA, Telford, R, Thomas, E, Thomas, Z, Truebe, S, von Gunten, L, Waite, A, Weitzel, N, Wilhelm, B, Williams, J, Williams, JJ, Winstrup, M, Zhao, N, and Zhou, Y
- Abstract
The progress of science is tied to the standardization of measurements, instruments, and data. This is especially true in the Big Data age, where analyzing large data volumes critically hinges on the data being standardized. Accordingly, the lack of community-sanctioned data standards in paleoclimatology has largely precluded the benefits of Big Data advances in the field. Building upon recent efforts to standardize the format and terminology of paleoclimate data, this article describes the Paleoclimate Community reporTing Standard (PaCTS), a crowdsourced reporting standard for such data. PaCTS captures which information should be included when reporting paleoclimate data, with the goal of maximizing the reuse value of paleoclimate data sets, particularly for synthesis work and comparison to climate model simulations. Initiated by the LinkedEarth project, the process to elicit a reporting standard involved an international workshop in 2016, various forms of digital community engagement over the next few years, and grassroots working groups. Participants in this process identified important properties across paleoclimate archives, in addition to the reporting of uncertainties and chronologies; they also identified archive-specific properties and distinguished reporting standards for new versus legacy data sets. This work shows that at least 135 respondents overwhelmingly support a drastic increase in the amount of metadata accompanying paleoclimate data sets. Since such goals are at odds with present practices, we discuss a transparent path toward implementing or revising these recommendations in the near future, using both bottom-up and top-down approaches.
- Published
- 2019
11. PaCTS 1.0: A Crowdsourced Reporting Standard for Paleoclimate Data
- Author
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Khider, D., Emile-Geay, J., McKay, N. P., Gil, Y., Garijo, D., Ratnakar, V, Alonso-Garcia, M., Bertrand, S., Bothe, O., Brewer, P., Bunn, A., Chevalier, M., Comas-Bru, L., Csank, A., Dassie, E., DeLong, K., Felis, T., Francus, P., Frappier, A., Gray, W., Goring, S., Jonkers, L., Kahle, M., Kaufman, D., Kehrwald, N. M., Martrat, B., McGregor, H., Richey, J., Schmittner, A., Scroxton, N., Sutherland, E., Thirumalai, K., Allen, K., Arnaud, F., Axford, Y., Barrows, T., Bazin, L., Birch, S. E. Pilaar, Bradley, E., Bregy, J., Capron, E., Cartapanis, O., Chiang, H-W, Cobb, K. M., Debret, M., Dommain, R., Du, J., Dyez, K., Emerick, S., Erb, M. P., Falster, G., Finsinger, W., Fortier, D., Gauthier, Nicolas, George, S., Grimm, E., Hertzberg, J., Hibbert, F., Hillman, A., Hobbs, W., Huber, M., Hughes, A. L. C., Jaccard, S., Ruan, J., Kienast, M., Konecky, B., Le Roux, G., Lyubchich, V, Novello, V. F., Olaka, L., Partin, J. W., Pearce, C., Phipps, S. J., Pignol, C., Piotrowska, N., Poli, M-S, Prokopenko, A., Schwanck, F., Stepanek, C., Swann, G. E. A., Telford, R., Thomas, E., Thomas, Z., Truebe, S., von Gunten, L., Waite, A., Weitzel, N., Wilhelm, B., Williams, J., Winstrup, M., Zhao, N., Zhou, Y., Khider, D., Emile-Geay, J., McKay, N. P., Gil, Y., Garijo, D., Ratnakar, V, Alonso-Garcia, M., Bertrand, S., Bothe, O., Brewer, P., Bunn, A., Chevalier, M., Comas-Bru, L., Csank, A., Dassie, E., DeLong, K., Felis, T., Francus, P., Frappier, A., Gray, W., Goring, S., Jonkers, L., Kahle, M., Kaufman, D., Kehrwald, N. M., Martrat, B., McGregor, H., Richey, J., Schmittner, A., Scroxton, N., Sutherland, E., Thirumalai, K., Allen, K., Arnaud, F., Axford, Y., Barrows, T., Bazin, L., Birch, S. E. Pilaar, Bradley, E., Bregy, J., Capron, E., Cartapanis, O., Chiang, H-W, Cobb, K. M., Debret, M., Dommain, R., Du, J., Dyez, K., Emerick, S., Erb, M. P., Falster, G., Finsinger, W., Fortier, D., Gauthier, Nicolas, George, S., Grimm, E., Hertzberg, J., Hibbert, F., Hillman, A., Hobbs, W., Huber, M., Hughes, A. L. C., Jaccard, S., Ruan, J., Kienast, M., Konecky, B., Le Roux, G., Lyubchich, V, Novello, V. F., Olaka, L., Partin, J. W., Pearce, C., Phipps, S. J., Pignol, C., Piotrowska, N., Poli, M-S, Prokopenko, A., Schwanck, F., Stepanek, C., Swann, G. E. A., Telford, R., Thomas, E., Thomas, Z., Truebe, S., von Gunten, L., Waite, A., Weitzel, N., Wilhelm, B., Williams, J., Winstrup, M., Zhao, N., and Zhou, Y.
- Abstract
The progress of science is tied to the standardization of measurements, instruments, and data. This is especially true in the Big Data age, where analyzing large data volumes critically hinges on the data being standardized. Accordingly, the lack of community-sanctioned data standards in paleoclimatology has largely precluded the benefits of Big Data advances in the field. Building upon recent efforts to standardize the format and terminology of paleoclimate data, this article describes the Paleoclimate Community reporTing Standard (PaCTS), a crowdsourced reporting standard for such data. PaCTS captures which information should be included when reporting paleoclimate data, with the goal of maximizing the reuse value of paleoclimate data sets, particularly for synthesis work and comparison to climate model simulations. Initiated by the LinkedEarth project, the process to elicit a reporting standard involved an international workshop in 2016, various forms of digital community engagement over the next few years, and grassroots working groups. Participants in this process identified important properties across paleoclimate archives, in addition to the reporting of uncertainties and chronologies; they also identified archive-specific properties and distinguished reporting standards for new versus legacy data sets. This work shows that at least 135 respondents overwhelmingly support a drastic increase in the amount of metadata accompanying paleoclimate data sets. Since such goals are at odds with present practices, we discuss a transparent path toward implementing or revising these recommendations in the near future, using both bottom-up and top-down approaches.
- Published
- 2019
12. Evaluation of Compiler Optimization Flags Effects on Soft Error Resiliency
- Author
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Felis T. Bortolon, Luciano Ost, Guilherme E. Medeiros, and Ricardo Reis
- Subjects
010308 nuclear & particles physics ,business.industry ,Computer science ,Reliability (computer networking) ,media_common.quotation_subject ,Optimizing compiler ,02 engineering and technology ,Program optimization ,computer.software_genre ,01 natural sciences ,020202 computer hardware & architecture ,Set (abstract data type) ,Software ,Soft error ,Debugging ,Embedded system ,0103 physical sciences ,0202 electrical engineering, electronic engineering, information engineering ,Compiler ,business ,computer ,media_common - Abstract
Compiler technology plays an important role in embedded applications, performance and power efficiency. Compilers provide software engineers with a wide variety of optimization settings (i.e., flags), which can be used to either configure debugging and warning messages or to achieve code optimization. While the use of optimization flags can substantially improve the performance of embedded application, their impact on soft error resiliency remains unclear. This paper investigates the impact of compiler optimization flags (i.e., −O1, −O2, −O3, and −Os) on soft error reliability of a MIPS processor running 24 benchmarks with up to 2.2 million instructions. The results show that the −Os level increased the soft error resilience to 75% of the application set when compared to the −O0 level. Moreover, −Os level provided enhancements up to 3.1x.
- Published
- 2018
13. PaCTS 1.0: A Crowdsourced Reporting Standard for Paleoclimate Data
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Khider, D., primary, Emile‐Geay, J., additional, McKay, N. P., additional, Gil, Y., additional, Garijo, D., additional, Ratnakar, V., additional, Alonso‐Garcia, M., additional, Bertrand, S., additional, Bothe, O., additional, Brewer, P., additional, Bunn, A., additional, Chevalier, M., additional, Comas‐Bru, L., additional, Csank, A., additional, Dassié, E., additional, DeLong, K., additional, Felis, T., additional, Francus, P., additional, Frappier, A., additional, Gray, W., additional, Goring, S., additional, Jonkers, L., additional, Kahle, M., additional, Kaufman, D., additional, Kehrwald, N. M., additional, Martrat, B., additional, McGregor, H., additional, Richey, J., additional, Schmittner, A., additional, Scroxton, N., additional, Sutherland, E., additional, Thirumalai, K., additional, Allen, K., additional, Arnaud, F., additional, Axford, Y., additional, Barrows, T., additional, Bazin, L., additional, Pilaar Birch, S. E., additional, Bradley, E., additional, Bregy, J., additional, Capron, E., additional, Cartapanis, O., additional, Chiang, H.‐W., additional, Cobb, K. M., additional, Debret, M., additional, Dommain, R., additional, Du, J., additional, Dyez, K., additional, Emerick, S., additional, Erb, M. P., additional, Falster, G., additional, Finsinger, W., additional, Fortier, D., additional, Gauthier, Nicolas, additional, George, S., additional, Grimm, E., additional, Hertzberg, J., additional, Hibbert, F., additional, Hillman, A., additional, Hobbs, W., additional, Huber, M., additional, Hughes, A. L. C., additional, Jaccard, S., additional, Ruan, J., additional, Kienast, M., additional, Konecky, B., additional, Le Roux, G., additional, Lyubchich, V., additional, Novello, V. F., additional, Olaka, L., additional, Partin, J. W., additional, Pearce, C., additional, Phipps, S. J., additional, Pignol, C., additional, Piotrowska, N., additional, Poli, M.‐S., additional, Prokopenko, A., additional, Schwanck, F., additional, Stepanek, C., additional, Swann, G. E. A., additional, Telford, R., additional, Thomas, E., additional, Thomas, Z., additional, Truebe, S., additional, Gunten, L., additional, Waite, A., additional, Weitzel, N., additional, Wilhelm, B., additional, Williams, J., additional, Williams, J. J., additional, Winstrup, M., additional, Zhao, N., additional, and Zhou, Y., additional
- Published
- 2019
- Full Text
- View/download PDF
14. Palaeoclimate constraints on the impact of 2 °c anthropogenic warming and beyond
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Fischer, H, Meissner, KJ, Mix, AC, Abram, NJ, Austermann, J, Brovkin, V, Capron, E, Colombaroli, D, Daniau, AL, Dyez, KA, Felis, T, Finkelstein, SA, Jaccard, SL, McClymont, EL, Rovere, A, Sutter, J, Wolff, EW, Affolter, S, Bakker, P, Ballesteros-Cánovas, JA, Barbante, C, Caley, T, Carlson, AE, Churakova, O, Cortese, G, Cumming, BF, Davis, BAS, De Vernal, A, Emile-Geay, J, Fritz, SC, Gierz, P, Gottschalk, J, Holloway, MD, Joos, F, Kucera, M, Loutre, MF, Lunt, DJ, Marcisz, K, Marlon, JR, Martinez, P, Masson-Delmotte, V, Nehrbass-Ahles, C, Otto-Bliesner, BL, Raible, CC, Risebrobakken, B, Sánchez Goñi, MF, Arrigo, JS, Sarnthein, M, Sjolte, J, Stocker, TF, Velasquez Alvárez, PA, Tinner, W, Valdes, PJ, Vogel, H, Wanner, H, Yan, Q, Yu, Z, Ziegler, M, Zhou, L, Fischer, H, Meissner, KJ, Mix, AC, Abram, NJ, Austermann, J, Brovkin, V, Capron, E, Colombaroli, D, Daniau, AL, Dyez, KA, Felis, T, Finkelstein, SA, Jaccard, SL, McClymont, EL, Rovere, A, Sutter, J, Wolff, EW, Affolter, S, Bakker, P, Ballesteros-Cánovas, JA, Barbante, C, Caley, T, Carlson, AE, Churakova, O, Cortese, G, Cumming, BF, Davis, BAS, De Vernal, A, Emile-Geay, J, Fritz, SC, Gierz, P, Gottschalk, J, Holloway, MD, Joos, F, Kucera, M, Loutre, MF, Lunt, DJ, Marcisz, K, Marlon, JR, Martinez, P, Masson-Delmotte, V, Nehrbass-Ahles, C, Otto-Bliesner, BL, Raible, CC, Risebrobakken, B, Sánchez Goñi, MF, Arrigo, JS, Sarnthein, M, Sjolte, J, Stocker, TF, Velasquez Alvárez, PA, Tinner, W, Valdes, PJ, Vogel, H, Wanner, H, Yan, Q, Yu, Z, Ziegler, M, and Zhou, L
- Abstract
Over the past 3.5 million years, there have been several intervals when climate conditions were warmer than during the pre-industrial Holocene. Although past intervals of warming were forced differently than future anthropogenic change, such periods can provide insights into potential future climate impacts and ecosystem feedbacks, especially over centennial-to-millennial timescales that are often not covered by climate model simulations. Our observation-based synthesis of the understanding of past intervals with temperatures within the range of projected future warming suggests that there is a low risk of runaway greenhouse gas feedbacks for global warming of no more than 2 °C. However, substantial regional environmental impacts can occur. A global average warming of 1-2 °C with strong polar amplification has, in the past, been accompanied by significant shifts in climate zones and the spatial distribution of land and ocean ecosystems. Sustained warming at this level has also led to substantial reductions of the Greenland and Antarctic ice sheets, with sea-level increases of at least several metres on millennial timescales. Comparison of palaeo observations with climate model results suggests that, due to the lack of certain feedback processes, model-based climate projections may underestimate long-term warming in response to future radiative forcing by as much as a factor of two, and thus may also underestimate centennial-to-millennial-scale sea-level rise.
- Published
- 2018
15. Evaluation of Compiler Optimization Flags Effects on Soft Error Resiliency
- Author
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Medeiros, Guilherme E., primary, Bortolon, Felis T., additional, Reis, Ricardo, additional, and Ost, Luciano, additional
- Published
- 2018
- Full Text
- View/download PDF
16. Comparing proxy and model estimates of hydroclimate variability and change over the Common Era
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Smerdon, JE, Luterbacher, J, Phipps, SJ, Anchukaitis, KJ, Ault, T, Coats, S, Cobb, KM, Cook, BI, Colose, C, Felis, T, Gallant, A, Jungclaus, JH, Konecky, B, LeGrande, A, Lewis, S, Lopatka, AS, Man, W, Mankin, JS, Maxwell, JT, Otto-Bliesner, BL, Partin, JW, Singh, D, Steiger, NJ, Tierney, JE, Zanchettin, D, Zhang, H, Atwood, AR, Andreu-Hayles, L, Baek, SH, Buckley, B, Cook, ER, D’Arrigo, R, Dee, SG, Griffiths, ML, Kulkarni, C, Kushnir, Y, Lehner, F, Leland, C, Okazaki, A, Palmer, J, Piovano, E, Raible, CC, Rao, MP, Scheff, J, Schmidt, GA, Seager, R, Widmann, M, Xoplaki, E, Smerdon, JE, Luterbacher, J, Phipps, SJ, Anchukaitis, KJ, Ault, T, Coats, S, Cobb, KM, Cook, BI, Colose, C, Felis, T, Gallant, A, Jungclaus, JH, Konecky, B, LeGrande, A, Lewis, S, Lopatka, AS, Man, W, Mankin, JS, Maxwell, JT, Otto-Bliesner, BL, Partin, JW, Singh, D, Steiger, NJ, Tierney, JE, Zanchettin, D, Zhang, H, Atwood, AR, Andreu-Hayles, L, Baek, SH, Buckley, B, Cook, ER, D’Arrigo, R, Dee, SG, Griffiths, ML, Kulkarni, C, Kushnir, Y, Lehner, F, Leland, C, Okazaki, A, Palmer, J, Piovano, E, Raible, CC, Rao, MP, Scheff, J, Schmidt, GA, Seager, R, Widmann, M, and Xoplaki, E
- Abstract
Water availability is fundamental to societies and ecosystems, but our understanding of variations in hydroclimate (including extreme events, flooding, and decadal periods of drought) is limited because of a paucity of modern instrumental observations that are distributed unevenly across the globe and only span parts of the 20th and 21st centuries. Such data coverage is insufficient for characterizing hydroclimate and its associated dynamics because of its multidecadal to centennial variability and highly regionalized spatial signature. High-resolution (seasonal to decadal) hydroclimatic proxies that span all or parts of the Common Era (CE) and paleoclimate simulations from climate models are therefore important tools for augmenting our understanding of hydroclimate variability. In particular, the comparison of the two sources of information is critical for addressing the uncertainties and limitations of both while enriching each of their interpretations. We review the principal proxy data available for hydroclimatic reconstructions over the CE and highlight the contemporary understanding of how these proxies are interpreted as hydroclimate indicators. We also review the available last-millennium simulations from fully coupled climate models and discuss several outstanding challenges associated with simulating hydroclimate variability and change over the CE. A specific review of simulated hydroclimatic changes forced by volcanic events is provided, as is a discussion of expected improvements in estimated radiative forcings, models, and their implementation in the future. Our review of hydroclimatic proxies and last-millennium model simulations is used as the basis for articulating a variety of considerations and best practices for how to perform proxy-model comparisons of CE hydroclimate. This discussion provides a framework for how best to evaluate hydroclimate variability and its associated dynamics using these comparisons and how they can better inform interpreta
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- 2017
17. Potential and limits of combining studies of coarse-and fine-grained sediments for the coastal event history of a Caribbean carbonate environment
- Author
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Scheffers, AM, Engel, MAX, May, SM, Scheffers, SR, Joannes-Boyau, R, Hänssler, E, Kennedy, K, Kelletat, D, Brückner, H, Vött, A, Schellmann, G, Schäbitz, F, Radtke, U, Sommer, B, Willershäuser, T, and Felis, T
- Subjects
Geochemistry & Geophysics ,04 Earth Sciences - Abstract
The coastal deposits of Bonaire, Leeward Antilles, are among the most studied archives for extreme-wave events (EWEs) in the Caribbean. Here we present more than 400 electron spin resonance (ESR) and radiocarbon data on coarse-clast deposits from Bonaire’s eastern and western coasts. The chronological data are compared to the occurrence and age of fine-grained extreme-wave deposits detected in lagoons and floodplains. Both approaches are aimed at the identification of EWEs, the differentiation between extraordinary storms and tsunamis, improving reconstructions of the coastal evolution, and establishing a geochronological framework for the events. Although the combination of different methods and archives contributes to a better understanding of the interplay of coastal and archive-related processes, insufficient separation, superimposition or burying of coarse-clast deposits and restricted dating accuracy limit the use of both fine-grained and coarse-clast geoarchives to unravel decadal-to centennial-scale events. At several locations, distinct landforms are attributed to different coastal flooding events interpreted to be of tsunami-genic origin. Coastal landforms on the western coast have significantly been influenced by (sub)-recent hurricanes, indicating that formation of the coarse-clast deposits on the eastern coast is likely to be related to past events of higher energy.
- Published
- 2014
18. Tropical Atlantic temperature seasonality at the end of the last interglacial
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Felis, T., Giry, Cyril, Scholz, D., Lohmann, Gerrit, Pfeiffer, Madlene, Pätzold, Jürgen, Kölling, M., Scheffers, S. R., Felis, T., Giry, Cyril, Scholz, D., Lohmann, Gerrit, Pfeiffer, Madlene, Pätzold, Jürgen, Kölling, M., and Scheffers, S. R.
- Abstract
The end of the last interglacial period, ~118 kyr ago, was characterized by substantial ocean circulation and climate perturbations resulting from instabilities of polar ice sheets. These perturbations are crucial for a better understanding of future climate change. The seasonal temperature changes of the tropical ocean, however, which play an important role in seasonal climate extremes such as hurricanes, floods and droughts at the present day, are not well known for this period that led into the last glacial. Here we present a monthly resolved snapshot of reconstructed sea surface temperature in the tropical North Atlantic Ocean for 117.7±0.8 kyr ago, using coral Sr/Ca and δ18O records. We find that temperature seasonality was similar to today, which is consistent with the orbital insolation forcing. Our coral and climate model results suggest that temperature seasonality of the tropical surface ocean is controlled mainly by orbital insolation changes during interglacials.
- Published
- 2015
19. A review of 2000 years of paleoclimatic evidence in the Mediterranean
- Author
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Luterbacher, Jürg, García-Herrera, R., R. Allan, A., G. Alvarez-Castro, B., Benito, G., Booth, J., Büntgen, U., Colombaroli, D., Davis, B., Esper, J., Felis, T., Fleitmann, D., Frank, D., Gallego, D., J. Gonzalez-Rouco, F., Goosse, H., Kiefer, T., G. Macklin, M., Montagna, P., Newman, L., J. Power, M., Rath, V., Roberts, N., Silenzi, S., Tinner, W., Valero-Garces, B., V. D. Schrier, G., Vannière, B., Wanner, H., P. Werner, J., Willett, G., Xoplaki, E., S. Zerefos, C., Zorita, E., Departamento Fisica de la Tierra, Astronomía y Astrofísica [Madrid], Universidad Complutense de Madrid [Madrid] ( UCM ), Oeschger Centre for Climate Change Research ( OCCR ), University of Bern, Department of Psychology [Austin] ( University of Texas ), University of Texas at Austin [Austin], Swiss Federal Research Institute WSL, SWISS FEDERAL RESEARCH INSTITUTE WSL, Université de Bern, Inst. Geol. Sciences, Université de Bern, Max-Planck-Institute for Biogeochemistry, Centro de Investigación Biomédica en Red de Enfermedades Hepáticas y Digestivas, Instituto de Salud Carlos III, Centre Georges Lemaître for Earth and Climate Research [Louvain] ( TECLIM ), Earth and Life Institute [Louvain-La-Neuve], Université Catholique de Louvain ( UCL ) -Université Catholique de Louvain ( UCL ), Earth and Environmental Sciences, School of Geography, University of Plymouth, Laboratoire Chrono-environnement ( LCE ), Université Bourgogne Franche-Comté ( UBFC ) -Centre National de la Recherche Scientifique ( CNRS ) -Université de Franche-Comté ( UFC ), Institute of Geography, Climatology and Meteorology and NCCR Climate, GKSS Research Centre, Vannière, Boris, Universidad Complutense de Madrid = Complutense University of Madrid [Madrid] (UCM), Oeschger Centre for Climate Change Research (OCCR), Department of Psychology [Austin] (University of Texas), Swiss Federal Institute for Forest, Snow and Landscape Research WSL, Instituto de Salud Carlos III [Madrid] (ISC), Centre Georges Lemaître for Earth and Climate Research [Louvain] (TECLIM), Earth and Life Institute [Louvain-La-Neuve] (ELI), Université Catholique de Louvain = Catholic University of Louvain (UCL)-Université Catholique de Louvain = Catholic University of Louvain (UCL), School of Geography, Earth and Environmental Sciences [Plymouth] (SoGEES), Plymouth University, Laboratoire Chrono-environnement - CNRS - UBFC (UMR 6249) (LCE), Université de Franche-Comté (UFC), Université Bourgogne Franche-Comté [COMUE] (UBFC)-Université Bourgogne Franche-Comté [COMUE] (UBFC)-Centre National de la Recherche Scientifique (CNRS), and Institute of Geography [Bern]
- Subjects
[SHS.ENVIR] Humanities and Social Sciences/Environmental studies ,[SHS.ENVIR]Humanities and Social Sciences/Environmental studies ,[ SHS.ENVIR ] Humanities and Social Sciences/Environmental studies - Published
- 2012
20. Pronouced interannual variability in tropical South Pacific temperatures during Heinrich Stadial 1
- Author
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Felis, T., Merkel, U., Asami, R., Deschamps, Pierre, Hathorne, E.C., Kölling, M., Bard, E., Cabioch, Guy, Durand, N., Prange, M., Schulz, M., Cahyarini, S.Y., and Pfeiffer, M.
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TEMPERATURE DE SURFACE ,VARIATION INTERANNUELLE ,CLIMAT ,CHANGEMENT CLIMATIQUE ,INDICATEUR ECOLOGIQUE ,EL NINO ,CORAIL ,ENSO - Published
- 2012
21. Pronounced interannual variability in tropical South Pacific temperatures during Heinrich stadial 1
- Author
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Felis, T., Merkel, U., Asami, R., Deschamps, Pierre, Hathorne, E.C., Kölling, M., Bard, E., Cabioch, Guy, Durand, N., Prange, M., and Sylvestre, Florence
- Published
- 2011
22. [Programme of screening for colorrectal cancer in the Valencia community, Spain: results of the first round (2005-2008)]
- Author
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Málaga López A, Salas Trejo D, Sala Felis T, Ponce Romero M, Goicoechea Sáez M, Andrés Martínez M, Llorens Ivorra C, and González Serrano I
- Published
- 2010
23. Programa de cribado de cáncer colorrectal de la comunidad valenciana: Resultados de la primera ronda: 2005-2008
- Author
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Málaga López A, Salas Trejo D, Sala Felis T, Ponce Romero M, Goicoechea Sáez M, Andrés Martínez M, Llorens Ivorra C, González Serrano I, and Grupo Cribado de Cáncer Colorrectal de la Comunidad Valenciana
- Subjects
digestive system diseases - Abstract
Several studies evaluating colorectal cancer (CRC) screening with fecal occult blood testing (FOBT) have reported a significant reduction in mortality from this tumor. The study aims to describe the results of the first round of the CRC screening program in medium-risk population of Valencia and assessing their feasibility and acceptability.
- Published
- 2010
24. Programme of Screening for Colorrectal Cancer in the Community Valenciana, Spain. Results of the First Round (2005-2008)
- Author
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Lopez A, Trejo D, Felis T, Romero M, Saez M, Martinez M, Ivorra C, Serrano I, and Grp Cribado Canc Colorrectal
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digestive system diseases - Abstract
Background: Several studies evaluating colorectal cancer (CRC) screening with fecal occult blood testing (FOBT) have reported a significant reduction in mortality from this tumor. The study aims to describe the results of the first round of the CRC screening program in medium-risk population of Valencia and assessing their feasibility and acceptability. Methods: Colorectal cancer screening pilot study using biennial FOBT. All residents (106,000 Inhabitants) between 50 and 69 years old (a subgroup of 70-74 years), from 3 selected health departments (04,07 and 13) were invited by mail to participate. The individuals with FOBT positive were referred to hospital for colonoscopy. The following rates were calculated as indicators of program quality: the participation rate, positive FOBT rate, acceptance rate of colonoscopy, and detection rate of low and high-risk adenomas and invasive cancers, and positive predictive value of FOBT. Results: The participation was 35,231 individuals (35.70%). The number of FOBT positive was 579(1.64% of total analyzed test), 548 people agreed colonoscopy (acceptance rate: 94.69%). 61 CRC were detected, 61 and 153 High-Risk and Low-Risk Adenomas (rates of 1.77, 1.77 and 4.46% per 1,000 participants). The positive predictive values for cancer, low-risk and high risk adenomas were 10.95%, 10.95%. and 27.46% respectively. Conclusion: The program indicators suggest that a population program of colorectal cancer is feasible in our community as the process indicators obtained are similar to those given in other programs in Spain and Europe.
- Published
- 2010
25. Intensification of the meridional temperature gradient in the Great Barrier Reef following the Last Glacial Maximum
- Author
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Felis, T., McGregor, H. V., Linsley, B. K., Tudhope, A. W., Gagan, M. K., Suzuki, A., Inoue, M., Thomas, A. L., Esat, T. M., Thompson, W. G., Tiwari, M., Potts, D. C., Mudelsee, Manfred, Yokoyama, Y., Webster, J. M., Felis, T., McGregor, H. V., Linsley, B. K., Tudhope, A. W., Gagan, M. K., Suzuki, A., Inoue, M., Thomas, A. L., Esat, T. M., Thompson, W. G., Tiwari, M., Potts, D. C., Mudelsee, Manfred, Yokoyama, Y., and Webster, J. M.
- Abstract
Tropical south-western Pacific temperatures are of vital importance to the Great Barrier Reef (GBR), but the role of sea surface temperatures (SSTs) in the growth of the GBR since the Last Glacial Maximum remains largely unknown. Here we present records of Sr/Ca and d18O for Last Glacial Maximum and deglacial corals that show a considerably steeper meridional SST gradient than the present day in the central GBR. We find a 1–2 °C larger temperature decrease between 17° and 20°S about 20,000 to 13,000 years ago. The result is best explained by the northward expansion of cooler subtropical waters due to a weakening of the South Pacific gyre and East Australian Current. Our findings indicate that the GBR experienced substantial meridional temperature change during the last deglaciation, and serve to explain anomalous deglacial drying of northeastern Australia. Overall, the GBR developed through significant SST change and may be more resilient than previously thought.
- Published
- 2014
26. Interannual variability in tropical Pacific temperatures during Heinrich stadial 1
- Author
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Felis, T., Merkel, U., Asami, R., Deschamps, P., Hathorne, E., Koelling, M., Bard, Edouard, Cabioch, Guy, Durand, N., Prange, M., Schulz, M., Cahyarini, S., Pfeiffer, M., Center for Marine Environmental Sciences [Bremen] (MARUM), Universität Bremen, University of the Ryukyus [Okinawa], Centre européen de recherche et d'enseignement des géosciences de l'environnement (CEREGE), Institut de Recherche pour le Développement (IRD)-Institut National de la Recherche Agronomique (INRA)-Aix Marseille Université (AMU)-Collège de France (CdF (institution))-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), Laboratoire d'Océanographie et du Climat : Expérimentations et Approches Numériques (LOCEAN), Muséum national d'Histoire naturelle (MNHN)-Institut de Recherche pour le Développement (IRD)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Institut Pierre-Simon-Laplace (IPSL (FR_636)), École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris Diderot - Paris 7 (UPD7)-École polytechnique (X)-Centre National d'Études Spatiales [Toulouse] (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7)-École polytechnique (X)-Centre National d'Études Spatiales [Toulouse] (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Leibniz Institute of Marine Science at the University of Kiel (IFM-GEOMAR), and Kiel University
- Subjects
4928 PALEOCEANOGRAPHY / Global climate models ,4922 PALEOCEANOGRAPHY / El Nino ,[SDU]Sciences of the Universe [physics] ,4926 PALEOCEANOGRAPHY / Glacial ,4916 PALEOCEANOGRAPHY / Corals - Abstract
International audience; Assessing the response of interannual climate variability in the tropical Pacific Ocean to future greenhouse warming is of paramount importance. However, the dominant mode of Pacific atmosphere-ocean variability on interannual timescales, the El Niño-Southern Oscillation (ENSO), is poorly understood with respect to its behaviour under boundary conditions different from today. For last glacial conditions, model simulations and rare proxy records of interannual climate variability in the Pacific are contradictory. Here we present a monthly resolved reconstruction of tropical South Pacific climate from 15,000 years ago at the end of the last glacial. This period was characterised by substantial cooling in the North Atlantic Ocean and a reduction in the strength of the Atlantic Meridional Overturning Circulation (AMOC) in response to massive iceberg discharge associated with Heinrich stadial 1 (H1). Our Sr/Ca palaeotemperature record constructed from a fossil coral recovered by Integrated Ocean Drilling Program (IODP) Expedition 310 to Tahiti indicates pronounced interannual ENSO variability, even though the site is only weakly influenced by ENSO today. From our coral record and simulations with a comprehensive climate model (CCSM3) we conclude that interannual ENSO variability in the tropical Pacific was strong during H1. Our results suggest that enhanced interannual variability in tropical Pacific temperatures is the ENSO response to a reduced AMOC under glacial boundary conditions.
- Published
- 2009
27. Evidence for tropical South Pacific climate change during the Younger Dryas and the Bolling-Allerod from geochemical records of fossil Tahiti corals
- Author
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Asami, R., Felis, T., Deschamps, Pierre, Hanawa, K., Iryu, Y., Bard, E., Durand, N., and Murayama, M.
- Subjects
Younger Dryas period ,fossil coral ,IODP Expedition 310 "Tahiti Sea Level" ,last deglaciation ,DP Hunter ,SrCa paleothermometer ,Bolling-Allerod warming - Abstract
We present monthly resolved records of strontium/calcium (Sr/Ca) and oxygen isotope (delta O-18) ratios from well-preserved fossil corals drilled during the Integrated Ocean Drilling Program (IODP) Expedition 310 "Tahiti Sea Level" and reconstruct sea surface conditions in the central tropical South Pacific Ocean during two time windows of the last deglaciation. The two Tahiti corals examined here are uranium/thorium (U/Th)-dated at 12.4 and 14.2 ka, which correspond to the Younger Dryas (YD) cold reversal and the Bolling-Allerod (B-A) warming of the Northern Hemisphere, respectively. The coral Sr/Ca records indicate that annual average sea surface temperature (SST) was 2.6-3.1 degrees C lower at 12.4 ka and 1.0-1.6 degrees C lower at 14.2 ka relative to the present, with no significant changes in the amplitude of the seasonal SST cycle. These cooler conditions were accompanied by seawater delta O-18(delta O-18(sw)) values higher by similar to 0.8 parts per thousand and similar to 0.6 parts per thousand relative to the present at 12.4 and 14.2 ka, respectively, implying more saline conditions in the surface waters. Along with previously published coral Sr/Ca records from the island [Cohen and Hart (2004), Deglacial sea surface temperatures of the western tropical Pacific: A new look at old coral. Paleoceanography 19, PA4031, doi:10.1029/2004PA001 084], our new Tahiti coral records suggest that a shift toward lower SST by similar to 1.5 degrees C occurred from 13.1 to 12.4 ka, which was probably associated with a shift toward higher delta O-18, by similar to 0.2 parts per thousand. Along with a previously published coral Sr/Ca record from Vanuatu [Correge et al. (2004), Interdecadal variation in the extent of South Pacific tropical waters during the Younger Dyras event. Nature 428, 927-929], the Tahiti coral records provide new evidence for a pronounced cooling of the western to central tropical South Pacific during the Northern Hemisphere YD event.
- Published
- 2009
28. Subtropical coral reveals abrupt early 20th century freshening in the western North Pacific Ocean
- Author
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Felis, T., Suzuki, A., Kuhnert, H., Dima, Mihai, Lohmann, Gerrit, and Kawahata, H.
- Published
- 2009
29. IODP Expedition 310 reconstructs sea level, climatic, and environmental changes in the South Pacific during the last deglaciation
- Author
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Camoin, G.F., Iryu, Y., McInroy, D.B., Asami, R., Braaksma, H., Cabioch, G., Castillo, P., Cohen, A., Cole, J.E., Deschamps, P., Fairbanks, R.G., Felis, T., Fujita, K., Hathorne, E., Lund, S., Machiyama, H., Matsuda, H., Quinn, T.M., Sugihara, K., Thomas, A., Vasconcelos, C., Verwer, K., Warthmann, R., Webster, J.M., Westphal, H., Woo, K.S., Yamada, T., and Yokoyama, Y.
- Published
- 2007
30. Chapter 1 Mediterranean climate variability over the last centuries: A review
- Author
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Luterbacher, J. Xoplaki, E. Casty, C. Wanner, H. Pauling, A. Küttel, M. Rutishauser, T. Brönnimann, S. Fischer, E. Fleitmann, D. Gonzalez-Rouco, F.J. García-Herrera, R. Barriendos, M. Rodrigo, F. Gonzalez-Hidalgo, J.C. Saz, M.A. Gimeno, L. Ribera, P. Brunet, M. Paeth, H. Rimbu, N. Felis, T. Jacobeit, J. Dünkeloh, A. Zorita, E. Guiot, J. Türkes, M. Alcoforado, M.J. Trigo, R. Wheeler, D. Tett, S. Mann, M.E. Touchan, R. Shindell, D.T. Silenzi, S. Montagna, P. Camuffo, D. Mariotti, A. Nanni, T. Brunetti, M. Maugeri, M. Zerefos, C. Zolt, S.D. Lionello, P. Nunes, M.F. Rath, V. Beltrami, H. Garnier, E. Ladurie, E.L.R.
- Published
- 2006
31. Increased seasonality in Middle East temperatures during the last interglacial period
- Author
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Felis, T., Lohmann, Gerrit, Kuhnert, H., Lorenz, S., Scholz, Dirk, Pätzold, J., Al-Rousan, A., and Al-Moghrabi, S. M.
- Abstract
The last interglacial period (about 125,000 years ago) is thought to have been at least as warm as the present climate. Owing to changes in the Earth's orbit around the Sun, it is thought that insolation in the Northern Hemisphere varied more strongly than today on seasonal timescales, which would have led to corresponding changes in the seasonal temperature cycle. Here we present seasonally resolved proxy records using corals from the northernmost Red Sea, which record climate during the last interglacial period, the late Holocene epoch and the present. We find an increased seasonality in the temperature recorded in the last interglacial coral. Today, climate in the northern Red Sea is sensitive to the North Atlantic Oscillation, a climate oscillation that strongly influences winter temperatures and precipitation in the North Atlantic region. From our coral records and simulations with a coupled atmosphere-ocean circulation model, we conclude that a tendency towards the high-index state of the North Atlantic Oscillation during the last interglacial period, which is consistent with European proxy records, contributed to the larger amplitude of the seasonal cycle in the Middle East.
- Published
- 2004
32. Shift in ENSO teleconnections recorded by a Red Sea coral
- Author
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Rimbu, Norel, Lohmann, Gerrit, Felis, T., and Pätzold, J.
- Abstract
El Nino-Southern Oscillation (ENSO) teleconnections over Europe and the Middle East are evaluated using an oxygen isotope coral time series from the northern Red Sea and various instrumental data sets. We detect a shift in the correlation between the Nino3 index and the Red Sea coral record in 1970s and we show that this shift can be attributed to non-stationary circulation regimes and related ENSO teleconnections. We find that positive anomalies of oxygen isotope in the Red Sea coral record from mid-1930s to late 1960s are associated with a strong Pacific-North Atlantic teleconnection accompanied by a weak Aleutian Low, a more zonal flow at mid-latitudes, and La Nina conditions in tropical Pacific. In contrast, positive anomalous of oxygen isotopes in the Red Sea coral after 1970s are related to El Nino conditions and weaker Pan-Pacific-Atlantic circulation regimes. Using the window correlation of the northern Red Sea coral record with two coral records from the tropical and subtropical Pacific, we find non-stationary relationships between the tropical Pacific and the European/Middle Eastern climate during the pre-instrumental period. Our results imply that the modulation of teleconnections at interdecadal time scales provides a limitation in the prediction and reconstruction of remote climate phenomena such as the ENSO impact over Europe.
- Published
- 2003
33. Controls of Caribbean surface hydrology during the mid- to late Holocene: insights from monthly resolved coral records
- Author
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Giry, Cyril, Felis, T., Kölling, M., Wei, Wei, Lohmann, Gerrit, Scheffers, S., Giry, Cyril, Felis, T., Kölling, M., Wei, Wei, Lohmann, Gerrit, and Scheffers, S.
- Abstract
Several proxy-based and modeling studies have investigated long-term changes in Caribbean climate during the Holocene, however, very little is known on its variability on short timescales. Here we reconstruct seasonality and interannual to multidecadal variability of sea surface hydrology of the southern Caribbean Sea by applying paired coral Sr/Ca and δ18O measurements on fossil annually banded Diploria strigosa corals from Bonaire. This allows for better understanding of seasonal to multidecadal variability of the Caribbean hydrological cycle during the mid- to late Holocene. The monthly resolved coral Δδ18O records are used as a proxy for the oxygen isotopic composition of seawater (δ18Osw) of the southern Caribbean Sea. Consistent with modern day conditions, annual δ18Osw cycles reconstructed from three modern corals reveal that freshwater budget at the study site is influenced by both net precipitation and advection of tropical freshwater brought by wind-driven surface currents. In contrast, the annual δ18Osw cycle reconstructed from a mid-Holocene coral indicates a sharp peak towards more negative values in summer, suggesting intense summer precipitation at 6 ka BP (before present). In line with this, our model simulations indicate that increased seasonality of the hydrological cycle at 6 ka BP results from enhanced precipitation in summertime. On interannual to multidecadal timescales, the systematic positive correlation observed between reconstructed sea surface temperature and salinity suggests that freshwater discharged from the Orinoco and Amazon rivers and transported into the Caribbean by wind-driven surface currents is a critical component influencing sea surface hydrology on these timescales.
- Published
- 2013
34. Interlaboratory study for coral Sr/Ca and other element/Ca ratio measurements
- Author
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Hathorne, E.C., Gagnon, A., Felis, T., Adkins, J., Asami, R., Boer, W., Caillon, N., Case, D., Cobb, K.M., Douville, E., deMenocal, P., Eisenhauer, A., Garbe-Schönberg, D., Geibert, W., Goldstein, S., Hughen, K., Inoue, M., Hodaka, K., Kölling, M., Le Cornec, F., Linsley, B.K., McGregor, H.V., Montagna, P., Nurhati, I.S., Quinn, T.R., Raddatz, J., Rebaubier, H., Robinson, L.F., Sadekov, A., Sherrell, R., Sinclair, D., Tudhope, A.W., Wei, G., Wong, H., Wu, H.C., You, C.-F., Hathorne, E.C., Gagnon, A., Felis, T., Adkins, J., Asami, R., Boer, W., Caillon, N., Case, D., Cobb, K.M., Douville, E., deMenocal, P., Eisenhauer, A., Garbe-Schönberg, D., Geibert, W., Goldstein, S., Hughen, K., Inoue, M., Hodaka, K., Kölling, M., Le Cornec, F., Linsley, B.K., McGregor, H.V., Montagna, P., Nurhati, I.S., Quinn, T.R., Raddatz, J., Rebaubier, H., Robinson, L.F., Sadekov, A., Sherrell, R., Sinclair, D., Tudhope, A.W., Wei, G., Wong, H., Wu, H.C., and You, C.-F.
- Abstract
The Sr/Ca ratio of coral aragonite is used to reconstruct past sea surface temperature (SST). Twenty-one laboratories took part in an interlaboratory study of coral Sr/Ca measurements. Results show interlaboratory bias can be significant, and in the extreme case could result in a range in SST estimates of 7°C. However, most of the data fall within a narrower range and the Porites coral reference material JCp-1 is now characterized well enough to have a certified Sr/Ca value of 8.838 mmol/mol with an expanded uncertainty of 0.089 mmol/mol following International Association of Geoanalysts (IAG) guidelines. This uncertainty, at the 95% confidence level, equates to 1.5°C for SST estimates using Porites, so is approaching fitness for purpose. The comparable median within laboratory error is <0.5°C. This difference in uncertainties illustrates the interlaboratory bias component that should be reduced through the use of reference materials like the JCp-1. There are many potential sources contributing to biases in comparative methods but traces of Sr in Ca standards and uncertainties in reference solution composition can account for half of the combined uncertainty. Consensus values that fulfil the requirements to be certified values were also obtained for Mg/Ca in JCp-1 and for Sr/Ca and Mg/Ca ratios in the JCt-1 giant clam reference material. Reference values with variable fitness for purpose have also been obtained for Li/Ca, B/Ca, Ba/Ca, and U/Ca in both reference materials. In future, studies reporting coral element/Ca data should also report the average value obtained for a reference material such as the JCp-1.
- Published
- 2013
35. A review of 2000 years of paleoclimatic evidence in the Mediterranean
- Author
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UCL - SST/ELI/ELIC - Earth & Climate, Luterbacher, J., Garcia-Herrera, R., Goosse, Hugues, Acker-On, S., Allan, R., Alvarez-Castro, C., Benito, G., Booth, J., Buntgen, U., Cagatay, N., Colombaroli, D., Davis, B., Esper, J., Felis, T., Fleitmann, D., Frank, D., Gallego, D., Garcia-Bustamante, E., Glaser, R., Gonzalez Rouco, Jésus Fidel, Kiefer, T., Macklin, M.G., Manning, S., Montagna, P., Newman, L., Power, M.J., Rath, V., Ribera, P., Riemann, D., Roberts, N., Silenzi, S., Tinner, W., Valero-Garces, B., van der Schrier, G., Tzedakis, C., Vannière, B., Vogt, S., Wanner, H., Werner, P., Willett, G., Williams, M.H., Xoplaki, E., Zerefos, C., Zorita, E., UCL - SST/ELI/ELIC - Earth & Climate, Luterbacher, J., Garcia-Herrera, R., Goosse, Hugues, Acker-On, S., Allan, R., Alvarez-Castro, C., Benito, G., Booth, J., Buntgen, U., Cagatay, N., Colombaroli, D., Davis, B., Esper, J., Felis, T., Fleitmann, D., Frank, D., Gallego, D., Garcia-Bustamante, E., Glaser, R., Gonzalez Rouco, Jésus Fidel, Kiefer, T., Macklin, M.G., Manning, S., Montagna, P., Newman, L., Power, M.J., Rath, V., Ribera, P., Riemann, D., Roberts, N., Silenzi, S., Tinner, W., Valero-Garces, B., van der Schrier, G., Tzedakis, C., Vannière, B., Vogt, S., Wanner, H., Werner, P., Willett, G., Williams, M.H., Xoplaki, E., Zerefos, C., and Zorita, E.
- Published
- 2012
36. Mid- to late Holocene changes in tropical Atlantic temperature seasonality and interannual to multidecadal variability documented in southern Caribbean corals
- Author
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Giry, C., Felis, T., Kölling, M., Scholz, D., Wei, W., Lohmann, G., Scheffers, S., Giry, C., Felis, T., Kölling, M., Scholz, D., Wei, W., Lohmann, G., and Scheffers, S.
- Abstract
Proxy reconstructions of tropical Atlantic sea surface temperature (SST) that extend beyond the period of instrumental observations have primarily focused on centennial to millennial variability rather than on seasonal to multidecadal variability. Here we present monthly-resolved records of Sr/Ca (a proxy of SST) from fossil annually-banded Diploria strigosa corals from Bonaire (southern Caribbean Sea). The individual corals provide time-windows of up to 68 years length, and the total number of 295 years of record allows for assessing the natural range of seasonal to multidecadal SST variability in the western tropical Atlantic during snapshots of the mid- to late Holocene. Comparable to modern climate, the coral Sr/Ca records reveal that mid- to late Holocene SST was characterised by clear seasonal cycles, persistent quasi-biennial and prominent interannual as well as inter- to multidecadal-scale variability. However, the magnitude of SST variations on these timescales has varied over the last 6.2 ka. The coral records show increased seasonality during the mid-Holocene consistent with climatemodel simulations indicating that southern Caribbean SST seasonality is induced by insolation changes on orbital timescales,whereas internal dynamics of the climate system play an important role on shorter timescales. Interannual SST variability is linked to ocean– atmosphere interactions of Atlantic and Pacific origin. Pronounced interannual variability in the western tropical Atlantic is indicated by a 2.35 ka coral, possibly related to a strengthening of the variability of the El Niño/Southern Oscillation throughout the Holocene. Prominent inter- to multidecadal SST variability is evident in the coral records and slightly more pronounced in the mid-Holocene. We finally argue that our coral data provide a target for studying Holocene climate variability on seasonal and interannual to multidecadal timescales, when using further numerical models and high-resolution proxy data.
- Published
- 2012
- Full Text
- View/download PDF
37. Signature of ENSO in a coral record from the southern Red Sea
- Author
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Ionita, Monica, Felis, T., Lohmann, Gerrit, Pätzold, J., Rimbu, Norel, Ionita, Monica, Felis, T., Lohmann, Gerrit, Pätzold, J., and Rimbu, Norel
- Published
- 2010
38. Controls of Caribbean surface hydrology during the mid- to late Holocene: insights from monthly resolved coral records
- Author
-
Giry, C., primary, Felis, T., additional, Kölling, M., additional, Wei, W., additional, Lohmann, G., additional, and Scheffers, S., additional
- Published
- 2013
- Full Text
- View/download PDF
39. Seasonality of the global hydrological cycle during interglacial warm periods
- Author
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Herold, Marcus, Lohmann, Gerrit, Felis, T., Pätzold, J., Herold, Marcus, Lohmann, Gerrit, Felis, T., and Pätzold, J.
- Published
- 2007
40. Sub-seasonal reconstructions of Middle East climate during the Holocene from northern Red Sea corals
- Author
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Felis, T., Kuhnert, H., Herold, Marcus, Lohmann, Gerrit, Al-Rousan, S. A., Pätzold, J., Felis, T., Kuhnert, H., Herold, Marcus, Lohmann, Gerrit, Al-Rousan, S. A., and Pätzold, J.
- Published
- 2007
41. Weather regimes as recorded by a northern Red Sea coral
- Author
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Rimbu, Norel, Lohmann, Gerrit, Dima, Mihai, Felis, T., Grosfeld, Klaus, Rimbu, Norel, Lohmann, Gerrit, Dima, Mihai, Felis, T., and Grosfeld, Klaus
- Published
- 2006
42. Late Miocene corals (10 Ma) from Crete (Greece) document interannual climate variability controlled by the Icelandic Low
- Author
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Brachert, T. C., Reuter, M., Felis, T., Kroeger, K. F., Lohmann, Gerrit, Micheels, A., Fassoulas, C., Brachert, T. C., Reuter, M., Felis, T., Kroeger, K. F., Lohmann, Gerrit, Micheels, A., and Fassoulas, C.
- Published
- 2006
43. Seasonal dependence of sea level pressure, temperature and precipitation patterns associated with interannual and decadal variability in a Red Sea coral record
- Author
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Rimbu, Norel, Lohmann, Gerrit, Felis, T., Pätzold, J., Rimbu, Norel, Lohmann, Gerrit, Felis, T., and Pätzold, J.
- Published
- 2006
44. EGU05-A-08737: 'Acceleration technique for Milankovitch type forcing in transient simulations of Holocene and Eemian climates'
- Author
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Lorenz, S. J., Lohmann, Gerrit, Felis, T., Kim, Jung-Hyun, Rimbu, Norel, Schneider, Robert, Lorenz, S. J., Lohmann, Gerrit, Felis, T., Kim, Jung-Hyun, Rimbu, Norel, and Schneider, Robert
- Published
- 2005
45. Distinct modes of bidecadal and multidecadal variability in a climate reconstruction of the last centuries from a South Pacific coral
- Author
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Dima, Mihai, Felis, T., Lohmann, Gerrit, Rimbu, Norel, Dima, Mihai, Felis, T., Lohmann, Gerrit, and Rimbu, Norel
- Published
- 2005
46. Controls of Caribbean surface hydrology during the mid- to late Holocene: insights from monthly resolved coral records
- Author
-
Giry, C., primary, Felis, T., additional, Kölling, M., additional, Wei, W., additional, Lohmann, G., additional, and Scheffers, S., additional
- Published
- 2012
- Full Text
- View/download PDF
47. Supplementary material to "Controls of Caribbean surface hydrology during the mid- to late Holocene: insights from monthly resolved coral records"
- Author
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Giry, C., primary, Felis, T., additional, Kölling, M., additional, Wei, W., additional, Lohmann, G., additional, and Scheffers, S., additional
- Published
- 2012
- Full Text
- View/download PDF
48. The Arctic Oscillation/North Atlantic Oscillation phenomenon on long time scales: models and data
- Author
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Lohmann, Gerrit, Lorenz, S., Rimbu, Norel, Felis, T., Kim, Jung-Hyun, Schneider, Robert, Lohmann, Gerrit, Lorenz, S., Rimbu, Norel, Felis, T., Kim, Jung-Hyun, and Schneider, Robert
- Published
- 2004
49. The ArcticOscillation/North Atlantic Oscillation phenomenon on long time scales: models and data
- Author
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Lohmann, Gerrit, Lorenz, S., Rimbu, Norel, Felis, T., Kim, Jung-Hyun, Schneider, Robert, Lohmann, Gerrit, Lorenz, S., Rimbu, Norel, Felis, T., Kim, Jung-Hyun, and Schneider, Robert
- Published
- 2004
50. Detection of climate modes as recorded in a seasonal-resolution coral record covering the last 250 years
- Author
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Rimbu, Norel, Lohmann, Gerrit, Felis, T., Pätzold, J., Rimbu, Norel, Lohmann, Gerrit, Felis, T., and Pätzold, J.
- Published
- 2004
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