气候变化领域集成服务门户(CCPortal): Decadal-scale progression of the onset of Dansgaard-Oeschger warming events

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DOI	10.5194/cp-15-811-2019
	Decadal-scale progression of the onset of Dansgaard-Oeschger warming events
	Erhardt T.; Capron E.; Olander Rasmussen S.; Schüpbach S.; Bigler M.; Adolphi F.; Fischer H.
发表日期	2019
ISSN	18149324
起始页码	811
结束页码	825
卷号	15 期号:2
英文摘要	During the last glacial period, proxy records throughout the Northern Hemisphere document a succession of rapid millennial-scale warming events, called Dansgaard-Oeschger (DO) events. A range of different mechanisms has been proposed that can produce similar warming in model experiments; however, the progression and ultimate trigger of the events are still unknown. Because of their fast nature, the progression is challenging to reconstruct from paleoclimate data due to the limited temporal resolution achievable in many archives and cross-dating uncertainties between records. Here, we use new high-resolution multi-proxy records of sea-salt (derived from sea spray and sea ice over the North Atlantic) and terrestrial (derived from the central Asian deserts) aerosol concentrations over the period 10-60 ka from the North Greenland Ice Core Project (NGRIP) and North Greenland Eemian Ice Drilling (NEEM) ice cores in conjunction with local precipitation and temperature proxies from the NGRIP ice core to investigate the progression of environmental changes at the onset of the warming events at annual to multi-annual resolution. Our results show on average a small lead of the changes in both local precipitation and terrestrial dust aerosol concentrations over the change in sea-salt aerosol concentrations and local temperature of approximately one decade. This suggests that, connected to the reinvigoration of the Atlantic meridional overturning circulation and the warming in the North Atlantic, both synoptic and hemispheric atmospheric circulation changes at the onset of the DO warming, affecting both the moisture transport to Greenland and the Asian monsoon systems. Taken at face value, this suggests that a collapse of the sea-ice cover may not have been the initial trigger for the DO warming. © Author(s) 2019.
语种	英语
scopus关键词	atmospheric circulation; Dansgaard-Oeschger cycle; decadal variation; GRIP; ice core; Last Glacial; meridional circulation; paleoclimate; paleotemperature; precipitation (climatology); proxy climate record; volcanic aerosol; Arctic; Atlantic Ocean; Atlantic Ocean (North); Greenland; Greenland Ice Sheet
来源期刊	Climate of the Past
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/146823
作者单位	Climate and Environmental Physics, Physics Institute and Oeschger Center for Climate Change Research, University of Bern, Sidlerstrasse 5, Bern, 3012, Switzerland; Physics of Ice, Climate and Earth, Niels Bohr Institute, University of Copenhagen, Tagensvej 16, Copenhagen, 2200, Denmark; British Antarctic Survey, High Cross, Madingley Road, Cambridge, CB3 0ET, United Kingdom; Quaternary Sciences, Department of Geology, Lund University, Sölvegatan 12, Lund, 22362, Sweden
推荐引用方式 GB/T 7714	Erhardt T.,Capron E.,Olander Rasmussen S.,et al. Decadal-scale progression of the onset of Dansgaard-Oeschger warming events[J],2019,15(2).
APA	Erhardt T..,Capron E..,Olander Rasmussen S..,Schüpbach S..,Bigler M..,...&Fischer H..(2019).Decadal-scale progression of the onset of Dansgaard-Oeschger warming events.Climate of the Past,15(2).
MLA	Erhardt T.,et al."Decadal-scale progression of the onset of Dansgaard-Oeschger warming events".Climate of the Past 15.2(2019).