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

Xu, Hai and Goldsmith, Yonaton and Lan, Jianghu and Tan, Liangcheng and Wang, Xulong and Zhou, Xinying and Cheng, Jun and Lang, Yunchao and Liu, Congqiang (2020) Juxtaposition of Western Pacific Subtropical High on Asian Summer Monsoon Shapes Subtropical East Asian Precipitation. Geophysical Research Letters, 47 (3). Art. No. e2019GL084705. ISSN 0094-8276.

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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.

Item Type:Article
Related URLs:
URLURL TypeDescription
Xu, Hai0000-0002-9493-1329
Goldsmith, Yonaton0000-0003-0398-9005
Cheng, Jun0000-0003-0168-1410
Lang, Yunchao0000-0001-8312-1235
Liu, Congqiang0000-0001-7451-0992
Additional Information:© 2020 American Geophysical Union. Received 26 JUL 2019; Accepted 27 JAN 2020; Accepted article online 29 JAN 2020. 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. Data are available via the NOAA online server.
Funding AgencyGrant Number
National Natural Science Foundation of China41761144070
Israel Science Foundation2487/17
National Natural Science Foundation of China41672169
Subject Keywords:Asian summer monsoon; Western Pacific Subtropical High; temperature gradients; subtropical Asia; Lake Chenghai; Lake levels
Issue or Number:3
Record Number:CaltechAUTHORS:20200130-092949424
Persistent URL:
Official Citation:Xu, H., Goldsmith, Y., Lan, J., Tan, L., Wang, X., Zhou, X., et al. (2020). Juxtaposition of western Pacific subtropical high on Asian Summer Monsoon shapes subtropical East Asian precipitation. Geophysical Research Letters, 47, e2019GL084705.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:101002
Deposited By: Tony Diaz
Deposited On:30 Jan 2020 19:08
Last Modified:05 Oct 2020 16:45

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