j.epsl.2013.05.022
type: Ontology
creation date: 2026-08-21T05:56:12+00:00
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Publication.10.1016/j.epsl.2013.05.022
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abstract: High resolution climate records of the ice age terminations from monsoon-dominated regions reveal the interplay of regional and global driving forces. Speleothem records from Chinese caves indicate that glacial terminations were interrupted by prominent weak monsoon intervals (WMI), lasting a few thousand years. Deglacial WMIs are interpreted as the result of cold temperature anomalies generated by sea ice feedbacks in the North Atlantic, most prominently during Heinrich Events. Recent modelling results suggest, however, that WMIs reflect changes in the intensity of the Indian rather than the East Asian monsoon. Here we use foraminiferal trace element (Mg/Ca and Ba/Ca) and stable isotope records from a sediment core off the Malabar coast in the southeastern Arabian Sea with centennial-scale resolution to test this hypothesis and to constrain the nature and timing of deglacial climate change in the tropical Indian Ocean. The Malabar deglacial SST record is unique in character and different from other tropical climate records. SST at the Last Glacial Maximum was 2.7'0.5 'C colder than pre-industrial SST. Deglacial warming started at 18.6 (95% CI range 18.8-18.1) kyr BP, within error of the onset of warming at other tropical sites as well as in Antarctica and the Southern Ocean and either coeval with or up to 1 kyr before the atmospheric CO2 rise. Warming took place in two steps separated by an interval of stable SST between 15.7 (16.2-14.9) and 13.2 (13.9-12.0) kyr BP. The d18O-water record and the Ba/Ca record, which is a measure of Indian sub-continent riverine runoff, indicate that the last ice age termination was marked by a prominent weak Indian Monsoon interval interrupted by an intense monsoon phase, as seen in speleothem records and predicted by modelling. A strong correspondence between the timing of the Malabar d18Osw record and the Hulu Cave monsoon record suggests that deglacial d18O changes in both localities dominantly reflect compositional changes in pr…
author: David W. Lea
author: Rajeev Saraswat
author: Rajiv Nigam
author: Andreas Mackensen
author: Dinesh K. Naik
cite key: saraswat2013deglaciationinthetropical
data url: doi.org
has DOI: 10.1016/j.epsl.2013.05.022
has link: http://dx.doi.org/10.1016/j.epsl.2013.05.022
journal: Earth and Planetary Science Letters
pages: 166-175
pub data url: doi.org
publication year: 2013
publisher: Elsevier BV
title: Deglaciation in the tropical Indian Ocean driven by interplay between the regional monsoon and global teleconnections
type: article
type: journal-article
volume: 375
wiki page modification date: 2017-05-08T11:11:49Z
modification date#aux: 2457881.9665394
wiki page sort key: Publication.10.1016/j.epsl.2013.05.022

SK237-GC04.Saraswat.2013
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Ocn-SWCoastOfIndia.Saraswat.2013
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