Southern Hemisphere forcing of South Asian monsoon precipitation over the past ~1 million years.

Gebregiorgis, Daniel, Hathorne, Ed C., Giosan, L., Clemens, S. , Nürnberg, Dirk and Frank, Martin (2018) Southern Hemisphere forcing of South Asian monsoon precipitation over the past ~1 million years. Open Access Nature Communications, 9 (4702). DOI 10.1038/s41467-018-07076-2.

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Abstract

The orbital-scale timing of South Asian monsoon (SAM) precipitation is poorly understood. Here we present new SST and seawater δ18O (δ18Osw) records from the Bay of Bengal, the core convective region of the South Asian monsoon, over the past 1 million years. Our records reveal that SAM precipitation peaked in the precession band ~9 kyrs after Northern Hemisphere summer insolation maxima, in phase with records of SAM winds in the Arabian Sea and eastern Indian Ocean. Precession-band variance, however, accounts for ~30% of the total variance of SAM precipitation while it was either absent or dominant in records of the East Asian monsoon (EAM). This and the observation that SAM precipitation was phase locked with obliquity minima and was sensitive to Southern Hemisphere warming provides clear evidence that SAM and EAM precipitation responded differently to orbital forcing and highlights the importance of internal processes forcing monsoon variability.

Document Type: Article
Keywords: NEAR-SURFACE SALINITY; INDIAN-SUMMER MONSOON; ICE-AGE TERMINATIONS; ARABIAN SEA; INTERANNUAL VARIABILITY; PLANKTONIC-FORAMINIFERA; NORTHERN-HEMISPHERE; TIME-SERIES; OCEAN; BENGAL
Research affiliation: Woods Hole
OceanRep > GEOMAR > FB1 Ocean Circulation and Climate Dynamics > FB1-P-OZ Paleo-Oceanography
Refereed: Yes
Open Access Journal?: Yes
DOI etc.: 10.1038/s41467-018-07076-2
ISSN: 2041-1723
Projects: IODP Priority Program
Date Deposited: 26 Nov 2018 12:45
Last Modified: 24 May 2019 09:44
URI: http://oceanrep.geomar.de/id/eprint/44745

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