Juxtaposition of Western Pacific Subtropical High on Asian Summer Monsoon Shapes Subtropical East Asian Precipitation
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.
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.Attached Files
Published - Xu_et_al-2020-Geophysical_Research_Letters.pdf
Supplemental Material - grl60187-sup-0001-2019gl084705-s01.docx
Files
Name | Size | Download all |
---|---|---|
md5:60b7350f7cf0aaa9c82a4c1d6a806c05
|
8.3 MB | Preview Download |
md5:79ebee4df23d5904b611a08fb3ee6849
|
11.2 MB | Download |
Additional details
- Eprint ID
- 101002
- Resolver ID
- CaltechAUTHORS:20200130-092949424
- 41761144070
- National Natural Science Foundation of China
- 2487/17
- Israel Science Foundation
- 41672169
- National Natural Science Foundation of China
- Created
-
2020-01-30Created from EPrint's datestamp field
- Updated
-
2021-11-16Created from EPrint's last_modified field