Arid
DOI10.1002/2016PA002971
Reconstruction of Indian summer monsoon winds and precipitation over the past 10,000 years using equatorial pacific SST proxy records
Gill, Emily C.1,2; Rajagopalan, Balaji1,2; Molnar, Peter H.2,3; Kushnir, Yochanan4; Marchitto, Thomas M.3,5
通讯作者Gill, Emily C.
来源期刊PALEOCEANOGRAPHY
ISSN0883-8305
EISSN1944-9186
出版年2017
卷号32期号:2页码:195-216
英文摘要

Using a multiproxy reduced dimension methodology, we reconstruct fields of Arabian Sea summer wind stress curl and Indian monsoon rainfall anomalies since early Holocene using sea surface temperature (SST) proxies (Mg/Ca and alkenones) from 27 locations scattered across the equatorial Pacific. Reconstructions of summer wind stress curl reveal positive anomalies of similar to 30% greater than present day off the coastlines of Oman and Yemen at 10 ka, suggesting enhanced ocean upwelling and an enhanced monsoon jet during this time. Positive wind stress curl anomalies in these regions continued but weakened to similar to 12% greater than present day at 6 ka. Wind stress curl anomalies increased by about 8% from 6 to 4 ka but declined again until 2 ka. Positive anomalies in wind stress curl during the early to middle Holocene are consistent with greater early Holocene abundances of the upwelling indicator Globigerina bulloides in the western Arabian Sea, which accumulates most rapidly in present climates during periods of marked upwelling. Spatial rainfall reconstructions reveal the greatest difference in precipitation at 10 ka over the core monsoon region (similar to 20-60% greater than present day) and concurrently the greatest deficit in rainfall in North East India and on the eastern side of the Western Ghats (similar to 10-30% less than present day). Specifically, reconstructions for 10 ka reveal 40-60% greater rainfall than present day over northwest India. These findings advance the hypothesis that teleconnections from the equatorial Pacific contributed to, if not accounted for, greater early to middle Holocene wetness over India as recorded


类型Article
语种英语
国家USA
收录类别SCI-E
WOS记录号WOS:000396832600009
WOS关键词SEA-SURFACE TEMPERATURE ; SOUTH CHINA SEA ; LAST GLACIAL MAXIMUM ; MODELING INTERCOMPARISON PROJECT ; EL-NINO/SOUTHERN-OSCILLATION ; GENERAL-CIRCULATION MODEL ; PMIP2 COUPLED SIMULATIONS ; CORE-TOP CALIBRATION ; THAR DESERT ; CLIMATE-CHANGE
WOS类目Geosciences, Multidisciplinary ; Oceanography ; Paleontology
WOS研究方向Geology ; Oceanography ; Paleontology
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/201381
作者单位1.Univ Colorado Boulder, Dept Civil Environm & Architectural Engn, Boulder, CO 80309 USA;
2.Cooperat Inst Res Environm Sci, Boulder, CO 80309 USA;
3.Univ Colorado Boulder, Dept Geol Sci, Boulder, CO USA;
4.Columbia Univ, Lamont Doherty Earth Observ, Palisades, NY USA;
5.Univ Colorado Boulder, Inst Arctic & Alpine Res, Boulder, CO USA
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GB/T 7714
Gill, Emily C.,Rajagopalan, Balaji,Molnar, Peter H.,et al. Reconstruction of Indian summer monsoon winds and precipitation over the past 10,000 years using equatorial pacific SST proxy records[J],2017,32(2):195-216.
APA Gill, Emily C.,Rajagopalan, Balaji,Molnar, Peter H.,Kushnir, Yochanan,&Marchitto, Thomas M..(2017).Reconstruction of Indian summer monsoon winds and precipitation over the past 10,000 years using equatorial pacific SST proxy records.PALEOCEANOGRAPHY,32(2),195-216.
MLA Gill, Emily C.,et al."Reconstruction of Indian summer monsoon winds and precipitation over the past 10,000 years using equatorial pacific SST proxy records".PALEOCEANOGRAPHY 32.2(2017):195-216.
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