气候变化领域集成服务门户(CCPortal): Snapshots of mean ocean temperature over the last 700000 years using noble gases in the EPICA Dome C ice core

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DOI	10.5194/cp-17-843-2021
	Snapshots of mean ocean temperature over the last 700000 years using noble gases in the EPICA Dome C ice core
	Haeberli M.; Baggenstos D.; Schmitt J.; Grimmer M.; Michel A.; Kellerhals T.; Fischer H.
发表日期	2021
ISSN	1814-9324
起始页码	757
结束页码	782
卷号	17 期号:2
英文摘要	Together with the latent heat stored in glacial ice sheets, the ocean heat uptake carries the lion's share of glacial-interglacial changes in the planetary heat content, but little direct information on the global mean ocean temperature (MOT) is available to constrain the ocean temperature response to glacial-interglacial climate perturbations. Using ratios of noble gases and molecular nitrogen trapped in the Antarctic EPICA Dome C ice core, we are able to reconstruct MOT for peak glacial and interglacial conditions during the last 700 000 years and explore the differences between these extrema. To this end, we have to correct the noble gas ratios for gas transport effects in the firn column and gas loss fractionation processes of the samples after ice core retrieval using the full elemental matrix of N2, Ar, Kr, and Xe in the ice and their individual isotopic ratios. The reconstructed MOT in peak glacials is consistently about 3.3±0.4 °C cooler compared to the Holocene. Lukewarm interglacials before the Mid-Brunhes Event 450 kyr ago are characterized by 1.6±0.4 °C lower MOT than the Holocene; thus, glacial-interglacial amplitudes were only about 50% of those after the Mid-Brunhes Event, in line with the reduced radiative forcing by lower greenhouse gas concentrations and their Earth system feedbacks. Moreover, we find significantly increased MOTs at the onset of Marine Isotope Stage 5.5 and 9.3, which are coeval with CO2 and CH4 overshoots at that time. We link these CO2 and CH4 overshoots to a resumption of the Atlantic Meridional Overturning Circulation, which is also the starting point of the release of heat previously accumulated in the ocean during times of reduced overturning. © 2021 Author(s).
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/183583
作者单位	Climate and Environmental Physics and Oeschger Centre for Climate Change Research, University of Bern, Sidlerstrasse 5, Bern, 3012, Switzerland; Laboratoire des Sciences Cryosphérique, EPFL, ENAC IIE CRYOS GR A0 455 (Bâtiment GR), Station 2, Lausanne, 1015, Switzerland
推荐引用方式 GB/T 7714	Haeberli M.,Baggenstos D.,Schmitt J.,et al. Snapshots of mean ocean temperature over the last 700000 years using noble gases in the EPICA Dome C ice core[J],2021,17(2).
APA	Haeberli M..,Baggenstos D..,Schmitt J..,Grimmer M..,Michel A..,...&Fischer H..(2021).Snapshots of mean ocean temperature over the last 700000 years using noble gases in the EPICA Dome C ice core.Climate of the Past,17(2).
MLA	Haeberli M.,et al."Snapshots of mean ocean temperature over the last 700000 years using noble gases in the EPICA Dome C ice core".Climate of the Past 17.2(2021).