Speleothem records from western Thailand indicate an early rapid shift of the Indian summer monsoon during the Younger Dryas termination
Mainland Southeast Asia experiences complex and variable hydroclimatic conditions, mainly due to its location at the intersection of Asian monsoon subsystems. Predicting future changes requires an in-depth understanding of paleoclimatic conditions that is currently hindered by a paucity of records i...
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sg-ntu-dr.10356-1803402024-10-07T15:30:45Z Speleothem records from western Thailand indicate an early rapid shift of the Indian summer monsoon during the Younger Dryas termination Jacobson, Matthew J. Chawchai, Sakonvan Scholz, Denis Riechelmann, Dana F.C. Holmgren, Karin Vonhof, Hubert Wang, Xianfeng Liu, Guangxin Asian School of the Environment Earth Observatory of Singapore Earth and Environmental Sciences Speleothems Southeast Asia Mainland Southeast Asia experiences complex and variable hydroclimatic conditions, mainly due to its location at the intersection of Asian monsoon subsystems. Predicting future changes requires an in-depth understanding of paleoclimatic conditions that is currently hindered by a paucity of records in some regions. In this paper, we present the first speleothem stable isotope records from western Thailand detailing the Bølling-Allerød interstadial, Younger Dryas termination, and early- to mid-Holocene period. We find evidence of higher precipitation during the Bølling-Allerød (14,321–12,824 years before present (1950: BP)) compared to a Younger Dryas termination that starts 11,702–11,674 BP, has a rapid shift centered on 11,660–11,641 BP, and ends 11,603–11,589 BP. In addition, our records show Holocene monsoon intensity peaking at 8250 BP or before, a multi-millennia delay from the Northern Hemisphere summer insolation peak, followed by a trend to drier conditions until at least 750 BP. Assessment of the timing of the Younger Dryas termination in paleoclimate records across Southeast Asia reveals an earlier shift of the Indian Summer Monsoon to global climate shifts when compared to East Asian Summer Monsoon records. The causes of this are currently unknown. Some potentially important aspects include: an Indian Summer Monsoon influence on East Asian Summer Monsoon strength via the Indian Ocean Dipole climate pattern, the role of the Tibetan Plateau in monsoon dynamics, and exposure of the Sundaland shoreline. More high-resolution paleoclimate records, especially on the pathway of Indian Summer Monsoon to East Asian Summer Monsoon, are required for further discussion on the mechanisms controlling the differences between climate regimes. National Research Foundation (NRF) Published version S. Chawchai thanks the Thailand Science Research and Innovation Fund, Chulalongkorn University and the DAAD faculty research grant (2016) for financial support. D. Scholz is thankful to the German Research Foundation (DFG SCHO 1274/9-1 and SCHO 1274/11-1), X. Wang is grateful for support from Singapore National Research Foundation grants (2017NRF-NSFC001-047 and NRFF2011-08) and G. Liu is thankful to the National Natural Science Foundation of China (Grant No. 42101024). 2024-10-02T04:40:21Z 2024-10-02T04:40:21Z 2024 Journal Article Jacobson, M. J., Chawchai, S., Scholz, D., Riechelmann, D. F., Holmgren, K., Vonhof, H., Wang, X. & Liu, G. (2024). Speleothem records from western Thailand indicate an early rapid shift of the Indian summer monsoon during the Younger Dryas termination. Quaternary Science Reviews, 330, 108597-. https://dx.doi.org/10.1016/j.quascirev.2024.108597 0277-3791 https://hdl.handle.net/10356/180340 10.1016/j.quascirev.2024.108597 2-s2.0-85187798940 330 108597 en 2017NRF-NSFC001-047 NRFF2011-08 Quaternary Science Reviews © 2024 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/). application/pdf |
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Earth and Environmental Sciences Speleothems Southeast Asia Jacobson, Matthew J. Chawchai, Sakonvan Scholz, Denis Riechelmann, Dana F.C. Holmgren, Karin Vonhof, Hubert Wang, Xianfeng Liu, Guangxin Speleothem records from western Thailand indicate an early rapid shift of the Indian summer monsoon during the Younger Dryas termination |
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Mainland Southeast Asia experiences complex and variable hydroclimatic conditions, mainly due to its location at the intersection of Asian monsoon subsystems. Predicting future changes requires an in-depth understanding of paleoclimatic conditions that is currently hindered by a paucity of records in some regions. In this paper, we present the first speleothem stable isotope records from western Thailand detailing the Bølling-Allerød interstadial, Younger Dryas termination, and early- to mid-Holocene period. We find evidence of higher precipitation during the Bølling-Allerød (14,321–12,824 years before present (1950: BP)) compared to a Younger Dryas termination that starts 11,702–11,674 BP, has a rapid shift centered on 11,660–11,641 BP, and ends 11,603–11,589 BP. In addition, our records show Holocene monsoon intensity peaking at 8250 BP or before, a multi-millennia delay from the Northern Hemisphere summer insolation peak, followed by a trend to drier conditions until at least 750 BP. Assessment of the timing of the Younger Dryas termination in paleoclimate records across Southeast Asia reveals an earlier shift of the Indian Summer Monsoon to global climate shifts when compared to East Asian Summer Monsoon records. The causes of this are currently unknown. Some potentially important aspects include: an Indian Summer Monsoon influence on East Asian Summer Monsoon strength via the Indian Ocean Dipole climate pattern, the role of the Tibetan Plateau in monsoon dynamics, and exposure of the Sundaland shoreline. More high-resolution paleoclimate records, especially on the pathway of Indian Summer Monsoon to East Asian Summer Monsoon, are required for further discussion on the mechanisms controlling the differences between climate regimes. |
author2 |
Asian School of the Environment |
author_facet |
Asian School of the Environment Jacobson, Matthew J. Chawchai, Sakonvan Scholz, Denis Riechelmann, Dana F.C. Holmgren, Karin Vonhof, Hubert Wang, Xianfeng Liu, Guangxin |
format |
Article |
author |
Jacobson, Matthew J. Chawchai, Sakonvan Scholz, Denis Riechelmann, Dana F.C. Holmgren, Karin Vonhof, Hubert Wang, Xianfeng Liu, Guangxin |
author_sort |
Jacobson, Matthew J. |
title |
Speleothem records from western Thailand indicate an early rapid shift of the Indian summer monsoon during the Younger Dryas termination |
title_short |
Speleothem records from western Thailand indicate an early rapid shift of the Indian summer monsoon during the Younger Dryas termination |
title_full |
Speleothem records from western Thailand indicate an early rapid shift of the Indian summer monsoon during the Younger Dryas termination |
title_fullStr |
Speleothem records from western Thailand indicate an early rapid shift of the Indian summer monsoon during the Younger Dryas termination |
title_full_unstemmed |
Speleothem records from western Thailand indicate an early rapid shift of the Indian summer monsoon during the Younger Dryas termination |
title_sort |
speleothem records from western thailand indicate an early rapid shift of the indian summer monsoon during the younger dryas termination |
publishDate |
2024 |
url |
https://hdl.handle.net/10356/180340 |
_version_ |
1814047112911912960 |