Intensification of the Pre-Meiyu Rainband in the Late 21st Century
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.
- Research Organization:
- Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
- Sponsoring Organization:
- National Science Foundation (NSF); USDOE
- Grant/Contract Number:
- AC02-05CH11231; SC0014078; AGS-1405479
- OSTI ID:
- 1581351
- Alternate ID(s):
- OSTI ID: 1530619
- Journal Information:
- Geophysical Research Letters, Vol. 46, Issue 13; ISSN 0094-8276
- Publisher:
- American Geophysical UnionCopyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
Intensification of the Pre‐Meiyu Rainband in the Late 21st Century
|
dataset | January 2019 |
Intensification of the Pre‐Meiyu Rainband in the Late 21st Century
|
dataset | January 2019 |
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