Two-phase structure of tropical hydroclimate during Heinrich Stadial 1 and its global implications

doi:10.1016/j.quascirev.2019.105900

IOCAS-IR > 海洋地质与环境重点实验室

	Two-phase structure of tropical hydroclimate during Heinrich Stadial 1 and its global implications
	Huang, Jie 1,2,3; Wan, Shiming1,2,3 ; Li, Anchun 1; Li, Tiegang4
	2019-10-15
发表期刊	QUATERNARY SCIENCE REVIEWS
ISSN	0277-3791
卷号	222 页码:15
通讯作者	Huang, Jie([email protected])
摘要	Previous studies have proposed that the two-phase structure of Heinrich Stadial 1 (HS1) is a ubiquitous feature. However, few studies have focused on the internal structure of HSI over a tropical domain; thus, the interhemispheric ocean-atmosphere teleconnections during HS1 are poorly defined. Here, we present high-resolution sedimentological, geochemical, and palaeoceanographic records from the core CG2 in the southern South China Sea (SCS), off the northern Sunda Shelf. The core continuously spans 9.0 -22.0 ky BP. The records suggest two episodes of increased monsoon rainfall during the pre-HS1 (similar to 19.0 -18.0 ky BP) and in the early HSI (17.5-16.1 ky BP), along with a weaker monsoon rainfall during the late HSI (16.1-14.7 ky BP). In contrast, a lower precipitation over the Flores Sea occurred during the early HSI, off the southern Sunda Shelf, followed by an enhanced precipitation runoff during the late HS1 (Muller et al., 2012). Notably, these two different precipitation phases characterise a southward Inter-tropical Convergence Zone (ITCZ) shift over the Sunda Shelf during HSI. These changes are also consistent with other monsoon records, as well as other available data from the tropical to high latitudes of both hemispheres, supporting the global scope of the twofold H51. We propose that the two episodes of intense monsoon rainfall over the northern Sunda Shelf during the pre-HS1 and the early HS1 observed in our study are closely linked to two different melting events associated with European ice sheet (EIS) retreat. We further propose that the subsequent maximum Atlantic meridional overturning circulation (AMOC) reduction and the migration of the ITCZ to its southernmost position during the late HSI are tightly connected with the destabilization of the marine-terminating ice-streams of the Laurentide ice sheet (LIS) in the North Atlantic. Tropical positive feedbacks during HS1, in turn, should have played an important role in sustaining the AMOC reduction and Northern Hemisphere (NH) stadial conditions, by continuously lowering the salinity of the low-latitude currents in the Atlantic Ocean. In addition, the tropical ITCZ appears to have been a key bridge in promoting interhemispheric climate connections, by which North Atlantic cooling was rapidly linked to increased Southern Ocean surface westerlies. This, in turn, drove upwelling and CO2 ventilatiOn from the Southern Ocean, and thereby facilitated deglacial warming. Finally, these findings show that tropical climate variation is an important component of deglacial climate changes; understanding how it responds to millennial events like HSI may help us better understand global teleconnections. (C) 2019 Elsevier Ltd. All rights reserved.
关键词	Sunda shelf Tropical ITCZ HS1 European ice sheet AMOC Last deglaciation
DOI	10.1016/j.quascirev.2019.105900
收录类别	SCI
语种	英语
资助项目	National Natural Science Foundation of China[41406064]; National Natural Science Foundation of China[41622603]
WOS研究方向	Physical Geography ; Geology
WOS类目	Geography, Physical ; Geosciences, Multidisciplinary
WOS记录号	WOS:000491685900004
出版者	PERGAMON-ELSEVIER SCIENCE LTD
引用统计	被引频次：26[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.qdio.ac.cn/handle/337002/164878
专题	海洋地质与环境重点实验室
通讯作者	Huang, Jie
作者单位	1.Chinese Acad Sci, Inst Oceanol, Key Lab Marine Geol & Environm, Qingdao 266071, Shandong, Peoples R China 2.Qingdao Natl Lab Marine Sci & Technol, Lab Marine Geol, Qingdao 266061, Shandong, Peoples R China 3.Chinese Acad Sci, Ctr Ocean Mega Sci, Qingdao 266071, Shandong, Peoples R China 4.State Ocean Adm, Inst Oceanog 1, Key Lab Marine Sedimentol & Environm Geol, Qingdao 266061, Shandong, Peoples R China
第一作者单位	中国科学院海洋研究所
通讯作者单位	中国科学院海洋研究所
推荐引用方式 GB/T 7714	Huang, Jie,Wan, Shiming,Li, Anchun,et al. Two-phase structure of tropical hydroclimate during Heinrich Stadial 1 and its global implications[J]. QUATERNARY SCIENCE REVIEWS,2019,222:15.
APA	Huang, Jie,Wan, Shiming,Li, Anchun,&Li, Tiegang.(2019).Two-phase structure of tropical hydroclimate during Heinrich Stadial 1 and its global implications.QUATERNARY SCIENCE REVIEWS,222,15.
MLA	Huang, Jie,et al."Two-phase structure of tropical hydroclimate during Heinrich Stadial 1 and its global implications".QUATERNARY SCIENCE REVIEWS 222(2019):15.

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