The 4.2 ka BP event: multi-proxy records from a closed lake in the northern margin of the East Asian summer monsoon
The 4.2 ka BP event has been widely investigated since it was suggested to be a possible cause for the collapse of ancient civilizations. With the growth of proxy records for decades, however, both its nature and its spatial pattern have become controversial. Here we examined multi-proxy data of the...
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ftcopernicus:oai:publications.copernicus.org:cp69744 2023-05-15T17:31:21+02:00 The 4.2 ka BP event: multi-proxy records from a closed lake in the northern margin of the East Asian summer monsoon Xiao, Jule Zhang, Shengrui Fan, Jiawei Wen, Ruilin Zhai, Dayou Tian, Zhiping Jiang, Dabang 2019-01-25 application/pdf https://doi.org/10.5194/cp-14-1417-2018 https://cp.copernicus.org/articles/14/1417/2018/ eng eng doi:10.5194/cp-14-1417-2018 https://cp.copernicus.org/articles/14/1417/2018/ eISSN: 1814-9332 Text 2019 ftcopernicus https://doi.org/10.5194/cp-14-1417-2018 2020-07-20T16:23:05Z The 4.2 ka BP event has been widely investigated since it was suggested to be a possible cause for the collapse of ancient civilizations. With the growth of proxy records for decades, however, both its nature and its spatial pattern have become controversial. Here we examined multi-proxy data of the grain-size distribution, ostracode assemblage, pollen assemblage, and the pollen-reconstructed mean annual precipitation from a sediment core at Hulun Lake in northeastern Inner Mongolia spanning the period between 5000 and 3000 cal. yr BP to identify the nature and the associated mechanism of the 4.2 ka BP event occurring in the monsoonal region of eastern Asia. Higher sand fraction contents, littoral ostracode abundances, and Chenopodiaceae pollen percentages together with lower mean annual precipitation reveal a significant dry event at the interval of 4210–3840 cal. yr BP that could be a regional manifestation of the 4.2 ka BP event in the northern margin of the East Asian summer monsoon (EASM). We suggest that the drought would be caused by a decline in the intensity of the EASM on millennial-to-centennial scales that could be physically related to persistent cooling of surface waters in the western tropical Pacific and the North Atlantic. The cooling of western tropical Pacific surface waters could reduce moisture production over the source area of the EASM, while the cooling of North Atlantic surface waters could suppress northward migrations of the EASM rain belt, both leading to a weakened EASM and thus decreased rainfall in the northern margin of the EASM. Text North Atlantic Copernicus Publications: E-Journals Pacific Climate of the Past 14 10 1417 1425 |
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English |
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The 4.2 ka BP event has been widely investigated since it was suggested to be a possible cause for the collapse of ancient civilizations. With the growth of proxy records for decades, however, both its nature and its spatial pattern have become controversial. Here we examined multi-proxy data of the grain-size distribution, ostracode assemblage, pollen assemblage, and the pollen-reconstructed mean annual precipitation from a sediment core at Hulun Lake in northeastern Inner Mongolia spanning the period between 5000 and 3000 cal. yr BP to identify the nature and the associated mechanism of the 4.2 ka BP event occurring in the monsoonal region of eastern Asia. Higher sand fraction contents, littoral ostracode abundances, and Chenopodiaceae pollen percentages together with lower mean annual precipitation reveal a significant dry event at the interval of 4210–3840 cal. yr BP that could be a regional manifestation of the 4.2 ka BP event in the northern margin of the East Asian summer monsoon (EASM). We suggest that the drought would be caused by a decline in the intensity of the EASM on millennial-to-centennial scales that could be physically related to persistent cooling of surface waters in the western tropical Pacific and the North Atlantic. The cooling of western tropical Pacific surface waters could reduce moisture production over the source area of the EASM, while the cooling of North Atlantic surface waters could suppress northward migrations of the EASM rain belt, both leading to a weakened EASM and thus decreased rainfall in the northern margin of the EASM. |
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Text |
author |
Xiao, Jule Zhang, Shengrui Fan, Jiawei Wen, Ruilin Zhai, Dayou Tian, Zhiping Jiang, Dabang |
spellingShingle |
Xiao, Jule Zhang, Shengrui Fan, Jiawei Wen, Ruilin Zhai, Dayou Tian, Zhiping Jiang, Dabang The 4.2 ka BP event: multi-proxy records from a closed lake in the northern margin of the East Asian summer monsoon |
author_facet |
Xiao, Jule Zhang, Shengrui Fan, Jiawei Wen, Ruilin Zhai, Dayou Tian, Zhiping Jiang, Dabang |
author_sort |
Xiao, Jule |
title |
The 4.2 ka BP event: multi-proxy records from a closed lake in the northern margin of the East Asian summer monsoon |
title_short |
The 4.2 ka BP event: multi-proxy records from a closed lake in the northern margin of the East Asian summer monsoon |
title_full |
The 4.2 ka BP event: multi-proxy records from a closed lake in the northern margin of the East Asian summer monsoon |
title_fullStr |
The 4.2 ka BP event: multi-proxy records from a closed lake in the northern margin of the East Asian summer monsoon |
title_full_unstemmed |
The 4.2 ka BP event: multi-proxy records from a closed lake in the northern margin of the East Asian summer monsoon |
title_sort |
4.2 ka bp event: multi-proxy records from a closed lake in the northern margin of the east asian summer monsoon |
publishDate |
2019 |
url |
https://doi.org/10.5194/cp-14-1417-2018 https://cp.copernicus.org/articles/14/1417/2018/ |
geographic |
Pacific |
geographic_facet |
Pacific |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
eISSN: 1814-9332 |
op_relation |
doi:10.5194/cp-14-1417-2018 https://cp.copernicus.org/articles/14/1417/2018/ |
op_doi |
https://doi.org/10.5194/cp-14-1417-2018 |
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Climate of the Past |
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14 |
container_issue |
10 |
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1417 |
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1425 |
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1766128879690317824 |