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Title: Intensification of the Pre-Meiyu Rainband in the Late 21st Century

Abstract

Increased atmospheric moisture content and changing land-ocean thermal contrasts are usually implicated in the East Asian summer rainfall response to global warming. We highlight an additional influence whereby increased meridional stationary eddy circulation downstream of the Tibetan Plateau drives a stronger moisture flux convergence over southeastern China, intensifying the early summer rainband. This effect occurs robustly across the Community Earth System Model large ensemble Representative Control Pathway 8.5 simulations, and only for its pre-Meiyu stage (mid-May through late June). The westerly jet impinging on the Plateau is also enhanced, suggesting an orographic influence on the westerlies as the root cause. The increased westerlies result from warmer tropical tropospheric temperatures that enhance the meridional temperature gradient at the latitudes of the Plateau. Finally, our results highlight the potential role of the westerlies in altering the East Asian early summer monsoon rainfall in the late 21st century.

Authors:
ORCiD logo [1];  [2];  [1];  [1]
  1. Univ. of California, Berkeley, CA (United States)
  2. Univ. of Hamburg (Germany)
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
National Science Foundation (NSF); USDOE
OSTI Identifier:
1581351
Alternate Identifier(s):
OSTI ID: 1530619
Grant/Contract Number:  
AC02-05CH11231; SC0014078; AGS-1405479
Resource Type:
Accepted Manuscript
Journal Name:
Geophysical Research Letters
Additional Journal Information:
Journal Volume: 46; Journal Issue: 13; Journal ID: ISSN 0094-8276
Publisher:
American Geophysical Union
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES

Citation Formats

Chiang, John C. H., Fischer, Johannes, Kong, Wenwen, and Herman, Michael J. Intensification of the Pre-Meiyu Rainband in the Late 21st Century. United States: N. p., 2019. Web. doi:10.1029/2019gl083383.
Chiang, John C. H., Fischer, Johannes, Kong, Wenwen, & Herman, Michael J. Intensification of the Pre-Meiyu Rainband in the Late 21st Century. United States. https://doi.org/10.1029/2019gl083383
Chiang, John C. H., Fischer, Johannes, Kong, Wenwen, and Herman, Michael J. Mon . "Intensification of the Pre-Meiyu Rainband in the Late 21st Century". United States. https://doi.org/10.1029/2019gl083383. https://www.osti.gov/servlets/purl/1581351.
@article{osti_1581351,
title = {Intensification of the Pre-Meiyu Rainband in the Late 21st Century},
author = {Chiang, John C. H. and Fischer, Johannes and Kong, Wenwen and Herman, Michael J.},
abstractNote = {Increased atmospheric moisture content and changing land-ocean thermal contrasts are usually implicated in the East Asian summer rainfall response to global warming. We highlight an additional influence whereby increased meridional stationary eddy circulation downstream of the Tibetan Plateau drives a stronger moisture flux convergence over southeastern China, intensifying the early summer rainband. This effect occurs robustly across the Community Earth System Model large ensemble Representative Control Pathway 8.5 simulations, and only for its pre-Meiyu stage (mid-May through late June). The westerly jet impinging on the Plateau is also enhanced, suggesting an orographic influence on the westerlies as the root cause. The increased westerlies result from warmer tropical tropospheric temperatures that enhance the meridional temperature gradient at the latitudes of the Plateau. Finally, our results highlight the potential role of the westerlies in altering the East Asian early summer monsoon rainfall in the late 21st century.},
doi = {10.1029/2019gl083383},
journal = {Geophysical Research Letters},
number = 13,
volume = 46,
place = {United States},
year = {2019},
month = {7}
}

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Works referencing / citing this record:

Intensification of the Pre‐Meiyu Rainband in the Late 21st Century
dataset, January 2019

  • Chiang, John; Fischer, Johannes; Kong, Wenwen
  • UC Berkeley
  • DOI: 10.6078/d12099