North Atlantic forcing of Indian Winter Monsoon intensification: Evidence from Holocene sediments from the tropical Indian Ocean Island of Sri Lanka
The teleconnection between the Asian monsoon system and North Atlantic forcing is an enduring prospect of the Earth’s climate. During the Holocene interstadial, the Indian summer monsoon showed asynchronous weakening links to ice rafting events documented in the North Atlantic region. However, the s...
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crsagepubl:10.1177/09596836231211875 2024-05-12T08:07:31+00:00 North Atlantic forcing of Indian Winter Monsoon intensification: Evidence from Holocene sediments from the tropical Indian Ocean Island of Sri Lanka Premaratne, Kusala Madhushani Chandrajith, Rohana Ratnayake, Nalin P Li, Si-Liang Gayantha, Kasun Routh, Joyanto Vetenskapsrådet National Science Foundation Sri Lanka National Natural Science Foundation of China 2023 http://dx.doi.org/10.1177/09596836231211875 https://journals.sagepub.com/doi/pdf/10.1177/09596836231211875 https://journals.sagepub.com/doi/full-xml/10.1177/09596836231211875 en eng SAGE Publications https://journals.sagepub.com/page/policies/text-and-data-mining-license The Holocene volume 34, issue 3, page 274-282 ISSN 0959-6836 1477-0911 Paleontology Earth-Surface Processes Ecology Archeology Global and Planetary Change journal-article 2023 crsagepubl https://doi.org/10.1177/09596836231211875 2024-04-18T08:34:23Z The teleconnection between the Asian monsoon system and North Atlantic forcing is an enduring prospect of the Earth’s climate. During the Holocene interstadial, the Indian summer monsoon showed asynchronous weakening links to ice rafting events documented in the North Atlantic region. However, the sensitivity of the Indian Winter Monsoon in response to North Atlantic cold spells is unclear due to a lack of compelling evidence. This study aims to extract the deglacial Indian Winter Monsoon signals using lithogenic tracers in coastal sediments and explore its association with the North Atlantic cooling episodes. A 5.1 m sediment core was retrieved from Pottuvil Lagoon in the southeastern coast of Sri Lanka, and the concentrations of K, Rb, Mg, Al, and Ti in 101 sub-sections were analysed using ICP-MS. The core- chronology was established by Bacon 2.2 age-depth modelling based on calibrated AMS 14 C dates. The monsoon signal was reconstructed using element proxies and compared with the drift ice indices from the North Atlantic deep-sea sediments. Results revealed distinct phases of intense monsoon activity at 2553–2984 years BP, 3899–5021 years BP, and 5244–5507 years BP intervals with intermittent weak phases during 2253–2553, 2984–3899, and 5021–5244 years BP. The episodes of the intensified Indian Winter Monsoon coincided with Bond Events 2, 3, and 4, showing a strong coherence with the North Atlantic’s deglacial climate. Thus, on a millennial scale, North-Atlantic cooling has triggered intense winter monsoon conditions over the tropical Indian Ocean region from the mid to late Holocene. In comparison with regional monsoon archives, the Pottuvil winter monsoon record exhibits an anti-phase association with the Indian Summer Monsoon during Holocene ice-rafted debris events. The geochemical approach executed in this study could provide new insight into the millennial-scale pacing of the winter counterpart of the Indian monsoon links to climate extremes of high northern latitudes. Article in Journal/Newspaper North Atlantic Ocean Island SAGE Publications Indian The Holocene 34 3 274 282 |
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Open Polar |
collection |
SAGE Publications |
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crsagepubl |
language |
English |
topic |
Paleontology Earth-Surface Processes Ecology Archeology Global and Planetary Change |
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Paleontology Earth-Surface Processes Ecology Archeology Global and Planetary Change Premaratne, Kusala Madhushani Chandrajith, Rohana Ratnayake, Nalin P Li, Si-Liang Gayantha, Kasun Routh, Joyanto North Atlantic forcing of Indian Winter Monsoon intensification: Evidence from Holocene sediments from the tropical Indian Ocean Island of Sri Lanka |
topic_facet |
Paleontology Earth-Surface Processes Ecology Archeology Global and Planetary Change |
description |
The teleconnection between the Asian monsoon system and North Atlantic forcing is an enduring prospect of the Earth’s climate. During the Holocene interstadial, the Indian summer monsoon showed asynchronous weakening links to ice rafting events documented in the North Atlantic region. However, the sensitivity of the Indian Winter Monsoon in response to North Atlantic cold spells is unclear due to a lack of compelling evidence. This study aims to extract the deglacial Indian Winter Monsoon signals using lithogenic tracers in coastal sediments and explore its association with the North Atlantic cooling episodes. A 5.1 m sediment core was retrieved from Pottuvil Lagoon in the southeastern coast of Sri Lanka, and the concentrations of K, Rb, Mg, Al, and Ti in 101 sub-sections were analysed using ICP-MS. The core- chronology was established by Bacon 2.2 age-depth modelling based on calibrated AMS 14 C dates. The monsoon signal was reconstructed using element proxies and compared with the drift ice indices from the North Atlantic deep-sea sediments. Results revealed distinct phases of intense monsoon activity at 2553–2984 years BP, 3899–5021 years BP, and 5244–5507 years BP intervals with intermittent weak phases during 2253–2553, 2984–3899, and 5021–5244 years BP. The episodes of the intensified Indian Winter Monsoon coincided with Bond Events 2, 3, and 4, showing a strong coherence with the North Atlantic’s deglacial climate. Thus, on a millennial scale, North-Atlantic cooling has triggered intense winter monsoon conditions over the tropical Indian Ocean region from the mid to late Holocene. In comparison with regional monsoon archives, the Pottuvil winter monsoon record exhibits an anti-phase association with the Indian Summer Monsoon during Holocene ice-rafted debris events. The geochemical approach executed in this study could provide new insight into the millennial-scale pacing of the winter counterpart of the Indian monsoon links to climate extremes of high northern latitudes. |
author2 |
Vetenskapsrådet National Science Foundation Sri Lanka National Natural Science Foundation of China |
format |
Article in Journal/Newspaper |
author |
Premaratne, Kusala Madhushani Chandrajith, Rohana Ratnayake, Nalin P Li, Si-Liang Gayantha, Kasun Routh, Joyanto |
author_facet |
Premaratne, Kusala Madhushani Chandrajith, Rohana Ratnayake, Nalin P Li, Si-Liang Gayantha, Kasun Routh, Joyanto |
author_sort |
Premaratne, Kusala Madhushani |
title |
North Atlantic forcing of Indian Winter Monsoon intensification: Evidence from Holocene sediments from the tropical Indian Ocean Island of Sri Lanka |
title_short |
North Atlantic forcing of Indian Winter Monsoon intensification: Evidence from Holocene sediments from the tropical Indian Ocean Island of Sri Lanka |
title_full |
North Atlantic forcing of Indian Winter Monsoon intensification: Evidence from Holocene sediments from the tropical Indian Ocean Island of Sri Lanka |
title_fullStr |
North Atlantic forcing of Indian Winter Monsoon intensification: Evidence from Holocene sediments from the tropical Indian Ocean Island of Sri Lanka |
title_full_unstemmed |
North Atlantic forcing of Indian Winter Monsoon intensification: Evidence from Holocene sediments from the tropical Indian Ocean Island of Sri Lanka |
title_sort |
north atlantic forcing of indian winter monsoon intensification: evidence from holocene sediments from the tropical indian ocean island of sri lanka |
publisher |
SAGE Publications |
publishDate |
2023 |
url |
http://dx.doi.org/10.1177/09596836231211875 https://journals.sagepub.com/doi/pdf/10.1177/09596836231211875 https://journals.sagepub.com/doi/full-xml/10.1177/09596836231211875 |
geographic |
Indian |
geographic_facet |
Indian |
genre |
North Atlantic Ocean Island |
genre_facet |
North Atlantic Ocean Island |
op_source |
The Holocene volume 34, issue 3, page 274-282 ISSN 0959-6836 1477-0911 |
op_rights |
https://journals.sagepub.com/page/policies/text-and-data-mining-license |
op_doi |
https://doi.org/10.1177/09596836231211875 |
container_title |
The Holocene |
container_volume |
34 |
container_issue |
3 |
container_start_page |
274 |
op_container_end_page |
282 |
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1798850217948217344 |