Disentangling source of moisture driving glacier dynamics and identification of 8.2 ka event: evidence from pore water isotopes, Western Himalaya
Two atmospheric circulation patterns, the Indian Summer Monsoon (ISM) and mid-latitude Westerlies control precipitation and thus glacier variability in the Himalaya. However, the role of the ISM and westerlies in controlling climate and thus past glacier variability in the Himalaya is poorly underst...
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ftunivbergen:oai:bora.uib.no:11250/2766412 2023-05-15T16:38:55+02:00 Disentangling source of moisture driving glacier dynamics and identification of 8.2 ka event: evidence from pore water isotopes, Western Himalaya Kumar, Om Ramanathan, Al L. Bakke, Jostein Kotlia, Bata Shrivastava, J. P. 2020 application/pdf https://hdl.handle.net/11250/2766412 https://doi.org/10.1038/s41598-020-71686-4 eng eng Nature Norges forskningsråd: 267719 urn:issn:2045-2322 https://hdl.handle.net/11250/2766412 https://doi.org/10.1038/s41598-020-71686-4 cristin:1831989 Scientific Reports. 2020, 10, 15324 Navngivelse 4.0 Internasjonal http://creativecommons.org/licenses/by/4.0/deed.no Copyright 2020 The Authors 15324 Scientific Reports 10 Journal article Peer reviewed 2020 ftunivbergen https://doi.org/10.1038/s41598-020-71686-4 2023-03-14T17:41:16Z Two atmospheric circulation patterns, the Indian Summer Monsoon (ISM) and mid-latitude Westerlies control precipitation and thus glacier variability in the Himalaya. However, the role of the ISM and westerlies in controlling climate and thus past glacier variability in the Himalaya is poorly understood because of the paucity of the ice core records. In this article, we present a new Holocene paleorecord disentangling the presence of the ISM and mid-latitude westerlies and their effect on glacier fluctuations during the Holocene. Our new record is based on high-resolution multi-proxy analyses (δ18Oporewater, deuterium-excess, grain size analysis, permeability, and environmental magnetism) of lake sediments retrieved from Chandratal Lake, Western Himalaya. Our study provides new evidence that improves the current understanding of the forcing factor behind glacier advances and retreat in the Western Himalaya and identifies the 8.2 ka cold event using the aforementioned proxies. The results indicate that the ISM dominated precipitation ~ 21% of the time, whereas the mid-latitude westerlies dominated precipitation ~ 79% of the time during the last 11 ka cal BP. This is the first study that portrays the moisture sources by using the above proxies from the Himalayan region as an alternative of ice core records. publishedVersion Article in Journal/Newspaper ice core University of Bergen: Bergen Open Research Archive (BORA-UiB) Indian Scientific Reports 10 1 |
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Open Polar |
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University of Bergen: Bergen Open Research Archive (BORA-UiB) |
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ftunivbergen |
language |
English |
description |
Two atmospheric circulation patterns, the Indian Summer Monsoon (ISM) and mid-latitude Westerlies control precipitation and thus glacier variability in the Himalaya. However, the role of the ISM and westerlies in controlling climate and thus past glacier variability in the Himalaya is poorly understood because of the paucity of the ice core records. In this article, we present a new Holocene paleorecord disentangling the presence of the ISM and mid-latitude westerlies and their effect on glacier fluctuations during the Holocene. Our new record is based on high-resolution multi-proxy analyses (δ18Oporewater, deuterium-excess, grain size analysis, permeability, and environmental magnetism) of lake sediments retrieved from Chandratal Lake, Western Himalaya. Our study provides new evidence that improves the current understanding of the forcing factor behind glacier advances and retreat in the Western Himalaya and identifies the 8.2 ka cold event using the aforementioned proxies. The results indicate that the ISM dominated precipitation ~ 21% of the time, whereas the mid-latitude westerlies dominated precipitation ~ 79% of the time during the last 11 ka cal BP. This is the first study that portrays the moisture sources by using the above proxies from the Himalayan region as an alternative of ice core records. publishedVersion |
format |
Article in Journal/Newspaper |
author |
Kumar, Om Ramanathan, Al L. Bakke, Jostein Kotlia, Bata Shrivastava, J. P. |
spellingShingle |
Kumar, Om Ramanathan, Al L. Bakke, Jostein Kotlia, Bata Shrivastava, J. P. Disentangling source of moisture driving glacier dynamics and identification of 8.2 ka event: evidence from pore water isotopes, Western Himalaya |
author_facet |
Kumar, Om Ramanathan, Al L. Bakke, Jostein Kotlia, Bata Shrivastava, J. P. |
author_sort |
Kumar, Om |
title |
Disentangling source of moisture driving glacier dynamics and identification of 8.2 ka event: evidence from pore water isotopes, Western Himalaya |
title_short |
Disentangling source of moisture driving glacier dynamics and identification of 8.2 ka event: evidence from pore water isotopes, Western Himalaya |
title_full |
Disentangling source of moisture driving glacier dynamics and identification of 8.2 ka event: evidence from pore water isotopes, Western Himalaya |
title_fullStr |
Disentangling source of moisture driving glacier dynamics and identification of 8.2 ka event: evidence from pore water isotopes, Western Himalaya |
title_full_unstemmed |
Disentangling source of moisture driving glacier dynamics and identification of 8.2 ka event: evidence from pore water isotopes, Western Himalaya |
title_sort |
disentangling source of moisture driving glacier dynamics and identification of 8.2 ka event: evidence from pore water isotopes, western himalaya |
publisher |
Nature |
publishDate |
2020 |
url |
https://hdl.handle.net/11250/2766412 https://doi.org/10.1038/s41598-020-71686-4 |
geographic |
Indian |
geographic_facet |
Indian |
genre |
ice core |
genre_facet |
ice core |
op_source |
15324 Scientific Reports 10 |
op_relation |
Norges forskningsråd: 267719 urn:issn:2045-2322 https://hdl.handle.net/11250/2766412 https://doi.org/10.1038/s41598-020-71686-4 cristin:1831989 Scientific Reports. 2020, 10, 15324 |
op_rights |
Navngivelse 4.0 Internasjonal http://creativecommons.org/licenses/by/4.0/deed.no Copyright 2020 The Authors |
op_doi |
https://doi.org/10.1038/s41598-020-71686-4 |
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Scientific Reports |
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10 |
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1766029279283380224 |