Record Details

Increased chemical weathering during the deglacial to mid-Holocene summer monsoon intensification

DRS at CSIR-National Institute of Oceanography

View Archive Info
 
 
Field Value
 
Title Increased chemical weathering during the deglacial to mid-Holocene summer monsoon intensification
 
Creator Miriyala, P.
Sukumaran, N.P.
Nath, B.N.
Ramamurty, P.B.
Sijinkumar, A.V.
Vijayagopal, B.
Ramaswamy, V.
Sebastian, T.
 
Subject Chemistry and biogeochemistry
Aquatic pollution
Meteorology and climatology
 
Description Chemical weathering and the ensuing atmospheric carbon dioxide consumption has long been considered to work on geological time periods until recently when some modelling and natural records have shown that the weathering-related CO2 consumption can change at century to glacial-interglacial time scale. Last glacial to interglacial transition period is a best test case to understand the interplay between Pco2-temperature-chemical weathering when a pulse of rapid chemical weathering was initiated. Here we show, from a high resolution 54ka record from the Andaman Sea in the northern Indian Ocean, that the chemical weathering responds to deglacial to mid-Holocene summer monsoon intensification in the Myanmar watersheds. The multi-proxy data (Al/K, CIA, Rb/Sr, 87Sr/86Sr for degree of weathering and 143Nd/144Nd for provenance) reveal an increase in silicate weathering with initiation of interglacial warm climate at ~17.7ka followed by a major change at 15.5ka. Inferred changes in chemical weathering have varied in tandem with the regional monsoonal proxies (δ18Osw-salinity changes of Northern Indian Ocean, effective Asian moisture content and δ18O records of Chinese caves) and are synchronous with changes in summer insolation at 30°N and δ18O of GISP2 implying that chemical weathering was not a later amplifier but worked in tandem with global climate change
 
Date 2017-09-22T09:00:46Z
2017-09-22T09:00:46Z
2017
 
Type Journal Article
 
Identifier Scientific Reports, vol.7; 2017; No.44310 doi:10.1038/srep44310
http://drs.nio.org/drs/handle/2264/5114
 
Language en
 
Rights Copyright [2017]. All efforts have been made to respect the copyright to the best of our knowledge. Inadvertent omissions, if brought to our notice, stand for correction and withdrawal of document from this repository.
 
Publisher Nature Publishing Group