globalchange  > 过去全球变化的重建
DOI: 10.5194/cp-15-811-2019
WOS记录号: WOS:000465965600001
论文题名:
Decadal-scale progression of the onset of Dansgaard-Oeschger warming events
作者: Erhardt, Tobias1,2; Capron, Emilie3,4; Rasmussen, Sune Olander3; Schupbach, Simon1,2; Bigler, Matthias1,2; Adolphi, Florian1,2,5; Fischer, Hubertus1,2
通讯作者: Erhardt, Tobias
刊名: CLIMATE OF THE PAST
ISSN: 1814-9324
EISSN: 1814-9332
出版年: 2019
卷: 15, 期:2, 页码:811-825
语种: 英语
WOS关键词: ABRUPT CLIMATE-CHANGE ; GREENLAND ICE-CORE ; SEA-SALT AEROSOL ; MERIDIONAL OVERTURNING CIRCULATION ; GLACIAL CLIMATE ; NORTH-ATLANTIC ; MILLENNIAL CHANGES ; OCEAN CIRCULATION ; DUST ; VARIABILITY
WOS学科分类: Geosciences, Multidisciplinary ; Meteorology & Atmospheric Sciences
WOS研究方向: Geology ; Meteorology & Atmospheric Sciences
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 on-set 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.


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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/136725
Appears in Collections:过去全球变化的重建

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作者单位: 1.Univ Bern, Inst Phys, Climate & Environm Phys, Sidlerstr 5, CH-3012 Bern, Switzerland
2.Univ Bern, Oeschger Ctr Climate Change Res, Sidlerstr 5, CH-3012 Bern, Switzerland
3.Univ Copenhagen, Niels Bohr Inst, Phys Ice Climate & Earth, Tagensvej 16, DK-2200 Copenhagen, Denmark
4.British Antarctic Survey, Madingley Rd, Cambridge CB3 0ET, England
5.Lund Univ, Dept Geol, Quaternary Sci, Solvegatan 12, S-22362 Lund, Sweden

Recommended Citation:
Erhardt, Tobias,Capron, Emilie,Rasmussen, Sune Olander,et al. Decadal-scale progression of the onset of Dansgaard-Oeschger warming events[J]. CLIMATE OF THE PAST,2019-01-01,15(2):811-825
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