气候变化领域集成服务门户(CCPortal): Convection-Permitting Hindcasting of Diurnal Variation of Mei-yu Rainfall Over East China With a Global Variable-Resolution Model

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DOI	10.1029/2021JD034823
	Convection-Permitting Hindcasting of Diurnal Variation of Mei-yu Rainfall Over East China With a Global Variable-Resolution Model
	Xu M.; Zhao C.; Gu J.; Feng J.; Hagos S.; Leung L.R.; Luo Y.; Guo J.; Li R.; Fu Y.
发表日期	2021
ISSN	2169-897X
卷号	126 期号:14
英文摘要	Two sets of 48-h hindcast experiments for Mei-yu season using non-hydrostatic global variable-resolution model (MPAS-Atmosphere) with regional refinement at 4 km resolution (V4km) and uniform 60 km resolution (U60km) are first-time conducted to attempt at simulating the Mei-yu rainfall in 2015 over East China. The analysis focuses on the seasonal average of diurnal variation of precipitation amount (PA), intensity (PI), and frequency (PF). Both simulations reasonably reproduce the spatial distribution of PA. V4km is more skillful in simulating the spatial distributions and magnitudes of PF and PI. The diurnal cycle of Mei-yu rainfall shows a major early morning peak and a minor afternoon peak, contributed by precipitation during two sub-periods with distinct synoptic circulations. With strong Mei-yu in the first sub-period, the diurnal variation of PA is controlled by nocturnal southwesterly jet. V4km overestimates the morning peak mainly due to its bias in simulating boundary layer inertial oscillation. Although differences in PA between the simulations are small, U60km overestimates PF and underestimates PI. With weak Mei-yu in the second sub-period, the diurnal variation of PA is controlled by both synoptic circulation and local convection. At both resolutions, deviations in the large-scale circulation modulated by a few typhoons lead to positive biases in the morning peak of PA. After removing the typhoon impacts, V4km captures the observed diurnal cycle of PA well, while U60km significantly underestimates PA and PI particularly in the afternoon. Future studies focusing on advancing modeling of southwesterly jet and typhoons may further improve convection permitting simulation of Mei-yu rainfall. © 2021. American Geophysical Union. All Rights Reserved.
来源期刊	Journal of Geophysical Research: Atmospheres
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/237131
作者单位	School of Earth and Space Sciences, University of Science and Technology of China, Hefei, China; CAS Center for Excellence in Comparative Planetology, University of Science and Technology of China, Hefei, China; Frontiers Science Center for Planetary Exploration and Emerging Technologies, University of Science and Technology of China, Hefei, China; Atmospheric Sciences and Global Change Division, Pacific Northwest National Laboratory, Richland, WA, United States; State Key Laboratory of Severe Weather, Chinese Academy of Meteorological Sciences, Beijing, China; Chinese Academy of Meteorological Sciences, Beijing, China
推荐引用方式 GB/T 7714	Xu M.,Zhao C.,Gu J.,et al. Convection-Permitting Hindcasting of Diurnal Variation of Mei-yu Rainfall Over East China With a Global Variable-Resolution Model[J],2021,126(14).
APA	Xu M..,Zhao C..,Gu J..,Feng J..,Hagos S..,...&Fu Y..(2021).Convection-Permitting Hindcasting of Diurnal Variation of Mei-yu Rainfall Over East China With a Global Variable-Resolution Model.Journal of Geophysical Research: Atmospheres,126(14).
MLA	Xu M.,et al."Convection-Permitting Hindcasting of Diurnal Variation of Mei-yu Rainfall Over East China With a Global Variable-Resolution Model".Journal of Geophysical Research: Atmospheres 126.14(2021).