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| Landais, Amaelle; Capron, Emilie; Masson-delmotte, Valerie; Toucanne, Samuel; Rhodes, Rachael; Popp, Trevor; Vinther, Bo; Minster, Benedicte; Prie, Frederic. |
| The last deglaciation represents the most recent example of natural global warming associated with largescale climate changes. In addition to the long-term global temperature increase, the last deglaciation onset is punctuated by a sequence of abrupt changes in the Northern Hemisphere. Such interplay between orbital-and millennial-scale variability is widely documented in paleoclimatic records but the underlying mechanisms are not fully understood. Limitations arise from the difficulty in constraining the sequence of events between external forcing, high-and low-latitude climate, and environmental changes. Greenland ice cores provide sub-decadal-scale records across the last deglaciation and contain fingerprints of climate variations occurring in different... |
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| Ano: 2018 |
URL: https://archimer.ifremer.fr/doc/00462/57349/59446.pdf |
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| Hansen, James; Kharecha, Pushker; Sato, Makiko; Masson-delmotte, Valerie; Ackerman, Frank; Beerling, David J.; Hearty, Paul J.; Hoegh-guldberg, Ove; Hsu, S; Parmesan, Camille; Rockstrom, Johan; Rohling, Eelco J.; Sachs, Jeffrey; Smith, Pete; Steffen, Konrad; Van Susteren, Lise; Von Schuckmann, Karina; Zachos, James C.. |
| We assess climate impacts of global warming using ongoing observations and paleoclimate data. We use Earth's measured energy imbalance, paleoclimate data, and simple representations of the global carbon cycle and temperature to define emission reductions needed to stabilize climate and avoid potentially disastrous impacts on today's young people, future generations, and nature. A cumulative industrial-era limit of similar to 500 GtC fossil fuel emissions and 100 GtC storage in the biosphere and soil would keep climate close to the Holocene range to which humanity and other species are adapted. Cumulative emissions of similar to 1000 GtC, sometimes associated with 2 degrees C global warming, would spur "slow" feedbacks and eventual warming of 3-4 degrees C... |
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| Ano: 2013 |
URL: http://archimer.ifremer.fr/doc/00170/28092/26670.pdf |
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| Uemura, Ryu; Motoyama, Hideaki; Masson-delmotte, Valerie; Jouzel, Jean; Kawamura, Kenji; Goto-azuma, Kumiko; Fujita, Shuji; Kuramoto, Takayuki; Hirabayashi, Motohiro; Miyake, Takayuki; Ohno, Hiroshi; Fujita, Koji; Abe-ouchi, Ayako; Iizuka, Yoshinori; Horikawa, Shinichiro; Igarashi, Makoto; Suzuki, Keisuke; Suzuki, Toshitaka; Fujii, Yoshiyuki. |
| The delta D temperature proxy in Antarctic ice cores varies in parallel with CO2 through glacial cycles. However, these variables display a puzzling asynchrony. Well-dated records of Southern Ocean temperature will provide crucial information because the Southern Ocean is likely key in regulating CO2 variations. Here, we perform multiple isotopic analyses on an Antarctic ice core and estimate temperature variations at this site and in the oceanic moisture source over the past 720,000 years, which extend the longest records by 300,000 years. Antarctic temperature is affected by large variations in local insolation that are induced by obliquity. At the obliquity periodicity, the Antarctic and ocean temperatures lag annual mean insolation. Further, the... |
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| Ano: 2018 |
URL: https://archimer.ifremer.fr/doc/00496/60788/64966.pdf |
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| Wary, Melanie; Eynaud, Frederique; Swingedouw, Didier; Masson-delmotte, Valerie; Matthiessen, Jens; Kissel, Catherine; Zumaque, Jena; Rossignol, Linda; Jouzel, Jean. |
| Dansgaard-Oeschger oscillations constitute one of the most enigmatic features of the last glacial cycle. Their cold atmospheric phases have been commonly associated with cold sea-surface temperatures and expansion of sea ice in the North Atlantic and adjacent seas. Here, based on dinocyst analyses from the 48-30 ka interval of four sediment cores from the northern Northeast Atlantic and southern Norwegian Sea, we provide direct and quantitative evidence of a regional paradoxical seesaw pattern: cold Greenland and North Atlantic phases coincide with warmer sea-surface conditions and shorter seasonal sea-ice cover durations in the Norwegian Sea as compared to warm phases. Combined with additional palaeorecords and multi-model hosing simulations, our results... |
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| Ano: 2017 |
URL: https://archimer.ifremer.fr/doc/00420/53149/55328.pdf |
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| Capron, Emilie; Govin, Aline; Stone, Emma J.; Masson-delmotte, Valerie; Mulitza, Stefan; Otto-bliesner, Bette; Rasmussen, Tine L.; Sime, Louise C.; Waelbroeck, Claire; Wolff, Eric W.. |
| The Last Interglacial (LIG, 129-116 thousand of years BP, ka) represents a test bed for climate model feedbacks in warmer-than-present high latitude regions. However, mainly because aligning different palaeoclimatic archives and from different parts of the world is not trivial, a spatio-temporal picture of LIG temperature changes is difficult to obtain. Here, we have selected 47 polar ice core and sub-polar marine sediment records and developed a strategy to align them onto the recent AICC2012 ice core chronology. We provide the first compilation of high-latitude temperature changes across the LIG associated with a coherent temporal framework built between ice core and marine sediment records. Our new data synthesis highlights non-synchronous maximum... |
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Palavras-chave: Last Interglacial period; Marine sediment cores; Ice cores; Data synthesis; Climate model simulations. |
| Ano: 2014 |
URL: https://archimer.ifremer.fr/doc/00289/40063/39166.pdf |
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