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contributor authorChenyu Zhu
contributor authorJiaxu Zhang
contributor authorZhengyu Liu
contributor authorBette L. Otto-Bliesner
contributor authorChengfei He
contributor authorEsther C. Brady
contributor authorRobert Tomas
contributor authorQin Wen
contributor authorQing Li
contributor authorChenguang Zhu
contributor authorShaoqing Zhang
contributor authorLixin Wu
date accessioned2023-04-12T18:42:23Z
date available2023-04-12T18:42:23Z
date copyright2022/10/31
date issued2022
identifier otherJCLI-D-22-0094.1.pdf
identifier urihttp://yetl.yabesh.ir/yetl1/handle/yetl/4290102
description abstractHeinrich Stadial 1 (HS1) was the major climate event at the onset of the last deglaciation associated with rapid cooling in Greenland and lagged, slow warming in Antarctica. Although it is widely believed that temperature signals were triggered in the Northern Hemisphere and propagated southward associated with the Atlantic meridional overturning circulation (AMOC), understanding how these signals were able to cross the Antarctic Circumpolar Current (ACC) barrier and further warm up Antarctica has proven particularly challenging. In this study, we explore the physical processes that lead to the Antarctic warming during HS1 in a transient isotope-enabled deglacial simulation iTRACE, in which the interpolar phasing has been faithfully reproduced. We show that the increased meridional heat transport alone, first through the ocean and then through the atmosphere, can explain the Antarctic warming during the early stage of HS1 without notable changes in the strength and position of the Southern Hemisphere midlatitude westerlies. In particular, when a reduction of the AMOC causes ocean warming to the north of the ACC, increased southward ocean heat transport by mesoscale eddies is triggered by steeper isopycnals to warm up the ocean beyond the ACC, which further decreases the sea ice concentration and leads to more absorption of insolation. The increased atmospheric heat then releases to the Antarctic primarily by a strengthening zonal wavenumber-3 (ZW3) pattern. Sensitivity experiments further suggest that a ∼4°C warming caused by this mechanism superimposed on a comparable warming driven by the background atmospheric CO
publisherAmerican Meteorological Society
titleAntarctic Warming during Heinrich Stadial 1 in a Transient Isotope-Enabled Deglacial Simulation
typeJournal Paper
journal volume35
journal issue22
journal titleJournal of Climate
identifier doi10.1175/JCLI-D-22-0094.1
journal fristpage3753
journal lastpage3765
page3753–3765
treeJournal of Climate:;2022:;volume( 035 ):;issue: 022
contenttypeFulltext


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