(Table S1) Age determination of sediment cores SK99_17 and MD76-131

Productivity in the Arabian Sea is one of the highest in the world. It is controlled by seasonally reversing monsoonal wind-driven upwelling of nutrient-rich deeper waters which fuel phytoplankton growth. The detailed history of upwelling-induced productivity in the eastern Arabian Sea is unknown. H...

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Bibliographic Details
Main Authors: Singh, Arun Deo, Jung, Simon J A, Darling, Kate F, Ganeshram, Raja S, Ivanochko, Tara S, Kroon, Dick
Format: Dataset
Language:English
Published: PANGAEA 2011
Subjects:
Age
14C AMS
14C calibrated
dated
dated standard deviation
Calendar age
DEPTH
sediment/rock
Event label
GC
Gravity corer
Indian Ocean
Marion Dufresne (1972)
MD10
MD76-131
OSIRIS II
PC
Piston corer
SK17
SK99_17
Indian
North Atlantic
Planktonic foraminifera
Online Access:https://doi.pangaea.de/10.1594/PANGAEA.829978
https://doi.org/10.1594/PANGAEA.829978
Description
Summary:Productivity in the Arabian Sea is one of the highest in the world. It is controlled by seasonally reversing monsoonal wind-driven upwelling of nutrient-rich deeper waters which fuel phytoplankton growth. The detailed history of upwelling-induced productivity in the eastern Arabian Sea is unknown. Here we present paleoproductivity records from a composite sediment core at the millennial scale during the last 80 kyr B.P. These records are based on relative abundance counts of planktonic foraminifera and organic carbon contents, which are shown to mainly vary in concert. The eastern Arabian Sea upwelling-induced productivity was higher in the glacial period than in the Holocene, but it fell repeatedly on millennial timescales. These productivity declines occurred during cold events in the North Atlantic region, with the most pronounced changes prevailing during the Heinrich events. Hence, seasonal monsoon winds that drive upwelling-induced productivity in the east were weak when the North Atlantic was cold. These weak winds resulted in stratification of the water column, comparable to today's Arabian Sea stratification in the intermonsoonal period. Combining the new eastern with published western Arabian Sea results shows that the entire biological factory was severely diminished during the North Atlantic Heinrich events, and the seasonal productivity change in the Arabian Sea monsoon system was reduced with year-round low productivity.

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