Juxtaposition of Western Pacific Subtropical High on Asian Summer Monsoon Shapes Subtropical East Asian Precipitation

Hai Xu; Yonaton Goldsmith; Jianghu Lan; Liangcheng Tan; Xulong Wang; Xinying Zhou; Jun Cheng; Yunchao Lang; Congqiang Liu

doi:10.1029/2019GL084705

Juxtaposition of Western Pacific Subtropical High on Asian Summer Monsoon Shapes Subtropical East Asian Precipitation

Hai Xu^*, Yonaton Goldsmith, Jianghu Lan, Liangcheng Tan, Xulong Wang, Xinying Zhou, Jun Cheng, Yunchao Lang, Congqiang Liu

^*Corresponding author for this work

Fredy & Nadine Herrmann Institute of Earth Sciences

Research output: Contribution to journal › Article › peer-review

41 Scopus citations

Abstract

Increasing lines of evidence question the homogenous response of Asian Summer Monsoon (ASM) precipitation patterns, requiring rethinking of the forcing mechanisms. Here we show a ~15,000-year quantitative precipitation history based on well-dated lake levels at Lake Chenghai, subtropical China. Lake levels and the inferred precipitation were high during the Bølling-Allerød, early and late Holocene, but low during the middle Holocene. The orbital scale precipitation trend is out of phase with boreal summer insolation, the later has been widely suggested as the driver of ASM precipitation. Lake Chenghai long-term lake levels are synchronous with trends in tropical Pacific sea surface temperatures, the related zonal sea surface temperature gradients, and interhemispheric temperature gradients. We propose that changes in either the interhemispheric or zonal Pacific temperature gradients modulate the intensity and location of the western Pacific subtropical high, which is juxtaposed on the ASM, leading to heterogeneous hydroclimatic conditions over subtropical East Asia.

Original language	American English
Article number	e2019GL084705
Journal	Geophysical Research Letters
Volume	47
Issue number	3
DOIs	https://doi.org/10.1029/2019GL084705
State	Published - 16 Feb 2020

Bibliographical note

Funding Information:
We thank Kathleen R. Johnson and another two anonymous reviewers for valuable comments and suggestions. This work is funded by the joint NSFC-ISF research program (NSFC grant 41761144070 and ISF grant 2487/17) and by the program (41672169) supported by the National Natural Science Foundation of China. Data are available via the NOAA online server.

Funding Information:
We thank Kathleen R. Johnson and another two anonymous reviewers for valuable comments and suggestions. This work is funded by the joint NSFC‐ISF research program (NSFC grant 41761144070 and ISF grant 2487/17) and by the program (41672169) supported by the National Natural Science Foundation of China. Data are available via the NOAA online server.

Publisher Copyright:
©2020. American Geophysical Union. All Rights Reserved.

Keywords

Asian summer monsoon
Lake Chenghai
Western Pacific Subtropical High
lake levels
subtropical Asia
temperature gradients

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10.1029/2019GL084705

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abstract = "Increasing lines of evidence question the homogenous response of Asian Summer Monsoon (ASM) precipitation patterns, requiring rethinking of the forcing mechanisms. Here we show a ~15,000-year quantitative precipitation history based on well-dated lake levels at Lake Chenghai, subtropical China. Lake levels and the inferred precipitation were high during the B{\o}lling-Aller{\o}d, early and late Holocene, but low during the middle Holocene. The orbital scale precipitation trend is out of phase with boreal summer insolation, the later has been widely suggested as the driver of ASM precipitation. Lake Chenghai long-term lake levels are synchronous with trends in tropical Pacific sea surface temperatures, the related zonal sea surface temperature gradients, and interhemispheric temperature gradients. We propose that changes in either the interhemispheric or zonal Pacific temperature gradients modulate the intensity and location of the western Pacific subtropical high, which is juxtaposed on the ASM, leading to heterogeneous hydroclimatic conditions over subtropical East Asia.",

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author = "Hai Xu and Yonaton Goldsmith and Jianghu Lan and Liangcheng Tan and Xulong Wang and Xinying Zhou and Jun Cheng and Yunchao Lang and Congqiang Liu",

note = "Funding Information: We thank Kathleen R. Johnson and another two anonymous reviewers for valuable comments and suggestions. This work is funded by the joint NSFC-ISF research program (NSFC grant 41761144070 and ISF grant 2487/17) and by the program (41672169) supported by the National Natural Science Foundation of China. Data are available via the NOAA online server. Funding Information: We thank Kathleen R. Johnson and another two anonymous reviewers for valuable comments and suggestions. This work is funded by the joint NSFC‐ISF research program (NSFC grant 41761144070 and ISF grant 2487/17) and by the program (41672169) supported by the National Natural Science Foundation of China. Data are available via the NOAA online server. Publisher Copyright: {\textcopyright}2020. American Geophysical Union. All Rights Reserved.",

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N2 - Increasing lines of evidence question the homogenous response of Asian Summer Monsoon (ASM) precipitation patterns, requiring rethinking of the forcing mechanisms. Here we show a ~15,000-year quantitative precipitation history based on well-dated lake levels at Lake Chenghai, subtropical China. Lake levels and the inferred precipitation were high during the Bølling-Allerød, early and late Holocene, but low during the middle Holocene. The orbital scale precipitation trend is out of phase with boreal summer insolation, the later has been widely suggested as the driver of ASM precipitation. Lake Chenghai long-term lake levels are synchronous with trends in tropical Pacific sea surface temperatures, the related zonal sea surface temperature gradients, and interhemispheric temperature gradients. We propose that changes in either the interhemispheric or zonal Pacific temperature gradients modulate the intensity and location of the western Pacific subtropical high, which is juxtaposed on the ASM, leading to heterogeneous hydroclimatic conditions over subtropical East Asia.

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Juxtaposition of Western Pacific Subtropical High on Asian Summer Monsoon Shapes Subtropical East Asian Precipitation

Abstract

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Keywords

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