Indian Summer Monsoon variability 140-70 thousand years ago based on multi-proxy records from the Bay of Bengal
Understanding the Indian Summer Monsoon (ISM) behaviour during the late Pleistocene has been largely based on the wind-driven upwelling records from the Arabian Sea. However, it remains unclear the extent to which these records can also be used to infer a concomitant signal of monsoon rainfall, or h...
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ftopenunivgb:oai:oro.open.ac.uk:81786 2023-06-11T04:12:51+02:00 Indian Summer Monsoon variability 140-70 thousand years ago based on multi-proxy records from the Bay of Bengal Nilsson-Kerr, Katrina Anand, Pallavi Sexton, Philip F. Leng, Melanie J. Naidu, P. D. 2022-03-01 application/pdf https://oro.open.ac.uk/81786/ https://oro.open.ac.uk/81786/1/Nilsson-Kerr%20et%20al.,%202022_QSR.pdf https://oro.open.ac.uk/81786/8/pagination_JQSR_10740392%20%28003%29.pdf https://doi.org/10.1016/j.quascirev.2022.107403 unknown https://oro.open.ac.uk/81786/1/Nilsson-Kerr%20et%20al.,%202022_QSR.pdf https://oro.open.ac.uk/81786/8/pagination_JQSR_10740392%20%28003%29.pdf Nilsson-Kerr, Katrina <http://oro.open.ac.uk/view/person/knk22.html>; Anand, Pallavi <http://oro.open.ac.uk/view/person/pa2398.html>; Sexton, Philip F. <http://oro.open.ac.uk/view/person/pfs67.html>; Leng, Melanie J. and Naidu, P. D. (2022). Indian Summer Monsoon variability 140-70 thousand years ago based on multi-proxy records from the Bay of Bengal. Quaternary Science Reviews, 279, article no. 107403. Journal Item Public PeerReviewed 2022 ftopenunivgb https://doi.org/10.1016/j.quascirev.2022.107403 2023-05-28T06:06:57Z Understanding the Indian Summer Monsoon (ISM) behaviour during the late Pleistocene has been largely based on the wind-driven upwelling records from the Arabian Sea. However, it remains unclear the extent to which these records can also be used to infer a concomitant signal of monsoon rainfall, or how the two ISM components, rainfall and wind, are linked on millennial timescales. In order to isolate a primary signal of ISM rainfall, we exploit two deep sea sediment cores from the northern Bay of Bengal (Site U1446) and Andaman Sea (Site U1448), both situated proximal to the South Asian continent, and thus ideally situated for capturing ISM rainfall and fluvial runoff. By comparing our multi-proxy ISMra infall and runoff records with published ISM wind-driven records from the Arabian Sea, we observe pronounced decoupling of the rainfall and wind components of the ISM across Marine Isotope Stage 5/6 (~140e70 thousand years ago). We reveal that the relative dominance of barometric dynamics (wind) and the thermodynamic (rainfall) components of the monsoon shifts with changes in background climate state. This finding constitutes an important consideration for the interpretation of past monsoon reconstructions. By comparing our new ISM rainfall records with high latitude climate records, we show that moisture export from low-latitudes, via the monsoon, could have preconditioned the high latitudes for ice sheet growth during glacial inceptions. Article in Journal/Newspaper Ice Sheet The Open University: Open Research Online (ORO) Indian Quaternary Science Reviews 279 107403 |
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Open Polar |
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The Open University: Open Research Online (ORO) |
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ftopenunivgb |
language |
unknown |
description |
Understanding the Indian Summer Monsoon (ISM) behaviour during the late Pleistocene has been largely based on the wind-driven upwelling records from the Arabian Sea. However, it remains unclear the extent to which these records can also be used to infer a concomitant signal of monsoon rainfall, or how the two ISM components, rainfall and wind, are linked on millennial timescales. In order to isolate a primary signal of ISM rainfall, we exploit two deep sea sediment cores from the northern Bay of Bengal (Site U1446) and Andaman Sea (Site U1448), both situated proximal to the South Asian continent, and thus ideally situated for capturing ISM rainfall and fluvial runoff. By comparing our multi-proxy ISMra infall and runoff records with published ISM wind-driven records from the Arabian Sea, we observe pronounced decoupling of the rainfall and wind components of the ISM across Marine Isotope Stage 5/6 (~140e70 thousand years ago). We reveal that the relative dominance of barometric dynamics (wind) and the thermodynamic (rainfall) components of the monsoon shifts with changes in background climate state. This finding constitutes an important consideration for the interpretation of past monsoon reconstructions. By comparing our new ISM rainfall records with high latitude climate records, we show that moisture export from low-latitudes, via the monsoon, could have preconditioned the high latitudes for ice sheet growth during glacial inceptions. |
format |
Article in Journal/Newspaper |
author |
Nilsson-Kerr, Katrina Anand, Pallavi Sexton, Philip F. Leng, Melanie J. Naidu, P. D. |
spellingShingle |
Nilsson-Kerr, Katrina Anand, Pallavi Sexton, Philip F. Leng, Melanie J. Naidu, P. D. Indian Summer Monsoon variability 140-70 thousand years ago based on multi-proxy records from the Bay of Bengal |
author_facet |
Nilsson-Kerr, Katrina Anand, Pallavi Sexton, Philip F. Leng, Melanie J. Naidu, P. D. |
author_sort |
Nilsson-Kerr, Katrina |
title |
Indian Summer Monsoon variability 140-70 thousand years ago based on multi-proxy records from the Bay of Bengal |
title_short |
Indian Summer Monsoon variability 140-70 thousand years ago based on multi-proxy records from the Bay of Bengal |
title_full |
Indian Summer Monsoon variability 140-70 thousand years ago based on multi-proxy records from the Bay of Bengal |
title_fullStr |
Indian Summer Monsoon variability 140-70 thousand years ago based on multi-proxy records from the Bay of Bengal |
title_full_unstemmed |
Indian Summer Monsoon variability 140-70 thousand years ago based on multi-proxy records from the Bay of Bengal |
title_sort |
indian summer monsoon variability 140-70 thousand years ago based on multi-proxy records from the bay of bengal |
publishDate |
2022 |
url |
https://oro.open.ac.uk/81786/ https://oro.open.ac.uk/81786/1/Nilsson-Kerr%20et%20al.,%202022_QSR.pdf https://oro.open.ac.uk/81786/8/pagination_JQSR_10740392%20%28003%29.pdf https://doi.org/10.1016/j.quascirev.2022.107403 |
geographic |
Indian |
geographic_facet |
Indian |
genre |
Ice Sheet |
genre_facet |
Ice Sheet |
op_relation |
https://oro.open.ac.uk/81786/1/Nilsson-Kerr%20et%20al.,%202022_QSR.pdf https://oro.open.ac.uk/81786/8/pagination_JQSR_10740392%20%28003%29.pdf Nilsson-Kerr, Katrina <http://oro.open.ac.uk/view/person/knk22.html>; Anand, Pallavi <http://oro.open.ac.uk/view/person/pa2398.html>; Sexton, Philip F. <http://oro.open.ac.uk/view/person/pfs67.html>; Leng, Melanie J. and Naidu, P. D. (2022). Indian Summer Monsoon variability 140-70 thousand years ago based on multi-proxy records from the Bay of Bengal. Quaternary Science Reviews, 279, article no. 107403. |
op_doi |
https://doi.org/10.1016/j.quascirev.2022.107403 |
container_title |
Quaternary Science Reviews |
container_volume |
279 |
container_start_page |
107403 |
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1768388976327000064 |