NDLI: Paired measurements of foraminiferal delta 18 O and Mg/Ca ratios of Indian monsoons reconstructed from Holocene to Last Glacial record

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Paired measurements of foraminiferal delta 18 O and Mg/Ca ratios of Indian monsoons reconstructed from Holocene to Last Glacial record

Content Provider	Semantic Scholar
Author	Badanal, Mahesh George, Berulava
Copyright Year	2011
Abstract	The effect of seasonally reversing monsoons in the northern Indian Ocean is to impart significant changes in surface salinity (SS). Here, we report SS changes during the last 32 kyr in the Lakshadweep Sea (southeastern Arabian Sea) estimated from paired measurements of δO and sea surface temperature (SST) utilizing Globigerinoides sacculifer, an upper mixed layer dwelling foraminifera. The heaviest δOG.sacculifer (0.07±0.08‰) is recorded between 23 – 15 ka BP, which could be defined as the last glacial maximum (LGM). The δOG.sacculifer shift between the LGM and Holocene is 2.07 ‰. The SST shows an overall warming of 2 °C from the LGM to Holocene (28 °C to 30 °C). However, coldest SSTs are observed prior to LGM, i.e., ~27 ka BP. The SS was higher (~ 38 psu) throughout most of the recorded last glacial period (32.5 – 15 ka BP). This high salinity together with generally lower SSTs suggests a period of sustained weaker summer or stronger winter monsoons. The deglacial warming is associated with rapid reorganization of monsoons and is reflected in decreased salinity to a modern level of ~ 36.5 psu, within a period of ~ 5 kyr. This indicates intensification of summer monsoons during cold to warm climate transition.
File Format	PDF HTM / HTML
Alternate Webpage(s)	http://drs.nio.org/drs/bitstream/handle/2264/3955/Acta_Geol_Sinica_85_950a.pdf?isAllowed=y&sequence=1
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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