j.quascirev.2016.02.012
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creation date: 2026-08-04T07:59:15+00:00
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Publication.10.1016/j.quascirev.2016.02.012
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page: https://wiki.linked.earth/Publication.10.1016/j.quascirev.2016.02.012
wiki namespace: 0
wiki page content language: en
abstract: The past variability of the South Asian Monsoon is mostly known from records of wind strength over the Arabian Sea while high-resolution paleorecords from regions of strong monsoon precipitation are still lacking. Here, we present records of past monsoon variability obtained from sediment core SK 168/GC-1, which was collected at the Alcock Seamount complex in the Andaman Sea. We utilize the ecological habitats of different planktic foraminiferal species to reconstruct freshwater-induced stratification based on paired Mg/Ca and d18O analyses and to estimate seawater d18O (d18Osw). The difference between surface and thermocline temperatures (delta T) and d18Osw (delta d18Osw) is used to investigate changes in upper ocean stratification. Additionally, Ba/Ca in G. sacculifer tests is used as a direct proxy for riverine runoff and sea surface salinity (SSS) changes related to monsoon precipitation on land. Our delta d18Osw time series reveals that upper ocean salinity stratification did not change significantly throughout the last glacial suggesting little influence of NH insolation changes. The strongest increase in temperature gradients between the mixed layer and the thermocline is recorded for the mid-Holocene and indicate the presence of a significantly shallower thermocline. In line with previous work, the d18Osw and Ba/Ca records demonstrate that monsoon climate during the LGM was characterized by a significantly weaker southwest monsoon circulation and strongly reduced runoff. Based on our data the South Asian Summer Monsoon (SAM) over the Irrawaddyy strengthened gradually after the LGM beginning at ~18 ka. This is some 3 kyrs before an increase of the Ba/Ca record from the Arabian Sea and indicates that South Asian Monsoon climate dynamics are more complex than the simple N-S displacement of the ITCZ as generally described for other regions. Minimum d18Osw values recorded during the mid-Holocene are in phase with Ba/Ca marking a stronger monsoon precipitation, w…
author: D. Gebregiorgis
author: E.C. Hathorne
author: A.V. Sijinkumar
author: B. Nagender Nath
author: D. Nürnberg
author: M. Frank
has DOI: 10.1016/j.quascirev.2016.02.012
has link: http://dx.doi.org/10.1016/j.quascirev.2016.02.012
journal: Quaternary Science Reviews
pages: 6-15
pub data url: doi.org
publication year: 2016
publisher: Elsevier BV
title: South Asian summer monsoon variability during the last ∼54 kyrs inferred from surface water salinity and river runoff proxies
type: journal-article
volume: 138
wiki page modification date: 2017-05-18T20:29:29Z
modification date#aux: 2457892.3538079
wiki page sort key: Publication.10.1016/j.quascirev.2016.02.012

SK168-GC1.Gebregiorgis.2016
type: Subject
page: https://wiki.linked.earth/SK168-2DGC1.Gebregiorgis.2016
wiki namespace: 0
wiki page content language: en
PublishedIn (L): Publication.10.1016/j.quascirev.2016.02.012
wiki page sort key: SK168-GC1.Gebregiorgis.2016

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