Productivity collapses in the Arabian Sea during glacial cold phases
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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Amer Geophysical Union
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ftarchimer:oai:archimer.ifremer.fr:33823 2023-05-15T17:28:43+02:00 Productivity collapses in the Arabian Sea during glacial cold phases Singh, Arun Deo Jung, Simon J.a. Darling, Kate Ganeshram, Raja Ivanochko, Tara Kroon, Dick 2011-08 application/pdf https://archimer.ifremer.fr/doc/00227/33823/32474.pdf https://archimer.ifremer.fr/doc/00227/33823/32475.pdf https://doi.org/10.1029/2009PA001923 https://archimer.ifremer.fr/doc/00227/33823/ eng eng Amer Geophysical Union https://archimer.ifremer.fr/doc/00227/33823/32474.pdf https://archimer.ifremer.fr/doc/00227/33823/32475.pdf doi:10.1029/2009PA001923 https://archimer.ifremer.fr/doc/00227/33823/ Copyright 2011 by the American Geophysical Union info:eu-repo/semantics/openAccess restricted use Paleoceanography (0883-8305) (Amer Geophysical Union), 2011-08 , Vol. 26 , N. 3 , P. PA3210 text Publication info:eu-repo/semantics/article 2011 ftarchimer https://doi.org/10.1029/2009PA001923 2021-09-23T20:25:10Z 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. Article in Journal/Newspaper North Atlantic Planktonic foraminifera Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) Paleoceanography 26 3 n/a n/a |
institution |
Open Polar |
collection |
Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) |
op_collection_id |
ftarchimer |
language |
English |
description |
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. |
format |
Article in Journal/Newspaper |
author |
Singh, Arun Deo Jung, Simon J.a. Darling, Kate Ganeshram, Raja Ivanochko, Tara Kroon, Dick |
spellingShingle |
Singh, Arun Deo Jung, Simon J.a. Darling, Kate Ganeshram, Raja Ivanochko, Tara Kroon, Dick Productivity collapses in the Arabian Sea during glacial cold phases |
author_facet |
Singh, Arun Deo Jung, Simon J.a. Darling, Kate Ganeshram, Raja Ivanochko, Tara Kroon, Dick |
author_sort |
Singh, Arun Deo |
title |
Productivity collapses in the Arabian Sea during glacial cold phases |
title_short |
Productivity collapses in the Arabian Sea during glacial cold phases |
title_full |
Productivity collapses in the Arabian Sea during glacial cold phases |
title_fullStr |
Productivity collapses in the Arabian Sea during glacial cold phases |
title_full_unstemmed |
Productivity collapses in the Arabian Sea during glacial cold phases |
title_sort |
productivity collapses in the arabian sea during glacial cold phases |
publisher |
Amer Geophysical Union |
publishDate |
2011 |
url |
https://archimer.ifremer.fr/doc/00227/33823/32474.pdf https://archimer.ifremer.fr/doc/00227/33823/32475.pdf https://doi.org/10.1029/2009PA001923 https://archimer.ifremer.fr/doc/00227/33823/ |
genre |
North Atlantic Planktonic foraminifera |
genre_facet |
North Atlantic Planktonic foraminifera |
op_source |
Paleoceanography (0883-8305) (Amer Geophysical Union), 2011-08 , Vol. 26 , N. 3 , P. PA3210 |
op_relation |
https://archimer.ifremer.fr/doc/00227/33823/32474.pdf https://archimer.ifremer.fr/doc/00227/33823/32475.pdf doi:10.1029/2009PA001923 https://archimer.ifremer.fr/doc/00227/33823/ |
op_rights |
Copyright 2011 by the American Geophysical Union info:eu-repo/semantics/openAccess restricted use |
op_doi |
https://doi.org/10.1029/2009PA001923 |
container_title |
Paleoceanography |
container_volume |
26 |
container_issue |
3 |
container_start_page |
n/a |
op_container_end_page |
n/a |
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1766121573621694464 |