globalchange  > 影响、适应和脆弱性
DOI: 10.5194/cp-14-1405-2018
Scopus记录号: 2-s2.0-85054582479
论文题名:
Ice core evidence for decoupling between midlatitude atmospheric water cycle and Greenland temperature during the last deglaciation
作者: Landais A.; Capron E.; Toucanne S.; Rhodes R.; Popp T.; Vinther B.; Minster B.; Prié F.
刊名: Climate of the Past
ISSN: 18149324
出版年: 2018
卷: 14, 期:10
起始页码: 1405
结束页码: 1415
语种: 英语
英文摘要: The last deglaciation represents the most recent example of natural global warming associated with large-scale 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 changesGreenland ice cores provide sub-decadal-scale records across the last deglaciation and contain fingerprints of climate variations occurring in different regions of the Northern Hemisphere. Here, we combine new ice d-excess and 17O-excess records, tracing changes in the midlatitudes, with ice 18O records of polar climate. Within Heinrich Stadial 1, we demonstrate a decoupling between climatic conditions in Greenland and those of the lower latitudes. While Greenland temperature remains mostly stable from 17.5 to 14.7-ka, significant change in the midlatitudes of the northern Atlantic takes place at 1/4 16.2-ka, associated with warmer and wetter conditions of Greenland moisture sources. We show that this climate modification is coincident with abrupt changes in atmospheric CO2 and CH4 concentrations recorded in an Antarctic ice core. Our coherent ice core chronological framework and comparison with other paleoclimate records suggests a mechanism involving two-step freshwater fluxes in the North Atlantic associated with a southward shift of the Intertropical Convergence Zone. © Author(s) 2018.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/109524
Appears in Collections:影响、适应和脆弱性
气候变化事实与影响

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作者单位: Laboratoire des Sciences du Climat et de l'Environnement, IPSL, UMR 8212, CEA-CNRS-UVSQ-UPS, Gif sur Yvette, France; Centre for Ice and Climate, Niels Bohr Institute, University of Copenhagen, Juliane Maries Vej 30, Copenhagen, 2900, Denmark; British Antarctic Survey, High Cross, Madingley Road, Cambridge, CB3 0ET, United Kingdom; IFREMER, Laboratoire Géophysique et Enregistrement Sédimentaire, Plouzané, CS 10070 29280, France; Department of Earth Sciences, University of Cambridge, Downing Street, Cambridge, CB2 3EQ, United Kingdom

Recommended Citation:
Landais A.,Capron E.,Toucanne S.,et al. Ice core evidence for decoupling between midlatitude atmospheric water cycle and Greenland temperature during the last deglaciation[J]. Climate of the Past,2018-01-01,14(10)
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