气候变化领域集成服务门户(CCPortal): Southern Ocean sea ice and frontal changes during the Late Quaternary and their linkages to Asian summer monsoon

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DOI	10.1016/j.quascirev.2019.04.007
	Southern Ocean sea ice and frontal changes during the Late Quaternary and their linkages to Asian summer monsoon
	Nair A.; Mohan R.; Crosta X.; Manoj M.C.; Thamban M.; Marieu V.
发表日期	2019
ISSN	0277-3791
起始页码	93
结束页码	104
卷号	213
英文摘要	The present study documents the interactions between Southern Hemisphere high-latitude (Antarctica & Southern Ocean), southern Indian Ocean subtropics (Agulhas leakage) and Asian summer monsoon. The study uses SST and sea-ice reconstructions along with diatom absolute abundances and diatom biometry from two sediment cores located at the Subantarctic Front (SAF) and Antarctic Polar Front (APF) in the southwest Indian sector of the Southern Ocean. Sea-ice records suggest the presence of the mean winter sea ice limit at around the modern APF location during MIS 2 and MIS 4 and episodic and unconsolidated winter sea ice far north as ∼43°S during LGM, when the SSTs were lowest. Higher diatom productivity and larger mean sizes of F. kerguelensis and T. lentiginosa recorded at the northern core site during the glacial stages suggest a northward shift of the APF. A decrease in diatom productivity and sizes at the southern core site highlights stratified Permanent Open Ocean Zone (POOZ) surface waters in response to longer sea-ice presence during the glacial stages. The comparative study between the records of Southern Hemisphere high-latitude and Asian summer monsoon climate variability revealed that the Asian summer monsoon variability could have been more likely forced by low latitude insolation gradient changes and supported by Antarctic climate changes via meridional shifts of the fronts and sea ice. The past changes in the intensity of Asian summer monsoon along with the Southern Ocean frontal variation might have influenced the Southern Indian Ocean surface circulation by changing the Agulhas leakage intensity. © 2019 Elsevier Ltd
英文关键词	Agulhas; Antarctica; Diatom; Indian Ocean; Polar front; Teleconnection
语种	英语
scopus关键词	Atmospheric thermodynamics; Climate change; Glacial geology; Productivity; Sea ice; Surface waters; Agulhas; Antarctica; Diatom; Indian ocean; Polar Front; Teleconnections; Oceanography; climate variation; comparative study; diatom; marine isotope stage; monsoon; polar front; Quaternary; sea ice; Southern Hemisphere; subtropical region; summer; teleconnection; Agulhas Current; Antarctica; Asia; Indian Ocean; Indian Ocean (South); Southern Ocean; Bacillariophyta
来源期刊	Quaternary Science Reviews
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/151932
作者单位	ESSO, National Centre for Polar and Ocean Research, Vasco-Da-Gama, Goa, India; UMR 5805 EPOC, Université de Bordeaux, Pessac, France; Birbal Sahni Institute of Paleosciences, Lucknow, India
推荐引用方式 GB/T 7714	Nair A.,Mohan R.,Crosta X.,et al. Southern Ocean sea ice and frontal changes during the Late Quaternary and their linkages to Asian summer monsoon[J],2019,213.
APA	Nair A.,Mohan R.,Crosta X.,Manoj M.C.,Thamban M.,&Marieu V..(2019).Southern Ocean sea ice and frontal changes during the Late Quaternary and their linkages to Asian summer monsoon.Quaternary Science Reviews,213.
MLA	Nair A.,et al."Southern Ocean sea ice and frontal changes during the Late Quaternary and their linkages to Asian summer monsoon".Quaternary Science Reviews 213(2019).