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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. doi: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. doi:10.1029/2019gl083383.
@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 referenced in this record:

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    Works referencing / citing this record:

    Monsoons in a changing world: A regional perspective in a global context: GLOBAL MONSOONS IN CMIP5 MODELS
    journal, April 2013

    • Kitoh, Akio; Endo, Hirokazu; Krishna Kumar, K.
    • Journal of Geophysical Research: Atmospheres, Vol. 118, Issue 8
    • DOI: 10.1002/jgrd.50258

    Summertime land–sea thermal contrast and atmospheric circulation over East Asia in a warming climate—Part I: Past changes and future projections
    journal, February 2014


    The East Asian summer monsoon: an overview
    journal, June 2005


    The representative concentration pathways: an overview
    journal, August 2011


    Role of seasonal transitions and westerly jets in East Asian paleoclimate
    journal, January 2015


    Tug of war on summertime circulation between radiative forcing and sea surface warming
    journal, June 2015

    • Shaw, T. A.; Voigt, A.
    • Nature Geoscience, Vol. 8, Issue 7
    • DOI: 10.1038/ngeo2449

    A Numerical Method for Predicting the Perturbations of the Middle Latitude Westerlies
    journal, May 1949


    East Asian hydroclimate modulated by the position of the westerlies during Termination I
    journal, November 2018

    • Zhang, Hongbin; Griffiths, Michael L.; Chiang, John C. H.
    • Science, Vol. 362, Issue 6414
    • DOI: 10.1126/science.aat9393

    Orographic Controls on Climate and Paleoclimate of Asia: Thermal and Mechanical Roles for the Tibetan Plateau
    journal, April 2010


    The Mechanical Impact of the Tibetan Plateau on the Seasonal Evolution of the South Asian Monsoon
    journal, April 2012


    A 44-Year Daily Gridded Precipitation Dataset for Asia Based on a Dense Network of Rain Gauges
    journal, January 2009