气候变化领域集成服务门户(CCPortal): Impact of parameterizing the turbulent orographic form drag on convection-permitting simulations of winds and precipitation over South China during the 2019 pre-summer rainy season

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DOI	10.1016/j.atmosres.2021.105814
	Impact of parameterizing the turbulent orographic form drag on convection-permitting simulations of winds and precipitation over South China during the 2019 pre-summer rainy season
	Xue H.; Zhou X.; Luo Y.; Yin J.
发表日期	2021
ISSN	0169-8095
卷号	263
英文摘要	A turbulent orographic form drag (TOFD) parameterization, which accounts for the unresolved drag induced by the subgrid orographic variance, is implemented in the Weather Research and Forecasting (WRF) model with a horizontal grid spacing of 3 km. Its impact on the surface wind and precipitation forecasts over South China during a pre-summer rainy season (April–June 2019) is evaluated based on 3-hourly observations from more than 2500 stations, by comparing the results from two series of parallel simulation with the TOFD parameterization turned on or off, respectively. Results show that the seasonal mean root mean square error (RMSE) and bias of the surface wind have been significantly reduced by more than 7% and 5%, respectively. The low-level wind is also shown improved by comparing the two series of simulations with 12-hourly observations from 26 sounding stations. Consequently, the equitable threat score (ETS) is increased by the TOFD parameterization for most rainfall-intensity categories, and the six-category mean ETS shows an improvement of more than 3%. The mechanism of the TOFD impact on low-level wind and precipitation is investigated as well. The low-level southwesterlies from the South China Sea flow over the rough land in South China are found to be weakened, which leads to the low-level wind convergence and more precipitation over those regions. Moreover, this effect is more apparent during the daytime. © 2021
英文关键词	Low-level wind; Pre-summer rainy season; South China; TOFD; WRF
来源期刊	Atmospheric Research
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/236594
作者单位	State Key Laboratory of Severe Weather, Chinese Academy of Meteorological Sciences, Beijing, China; National Tibetan Plateau Data Center, Key Laboratory of Tibetan Environmental Changes and Land Surface Processes, Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing, 100101, China; Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters, Nanjing University of Information Science and Technology, China
推荐引用方式 GB/T 7714	Xue H.,Zhou X.,Luo Y.,et al. Impact of parameterizing the turbulent orographic form drag on convection-permitting simulations of winds and precipitation over South China during the 2019 pre-summer rainy season[J],2021,263.
APA	Xue H.,Zhou X.,Luo Y.,&Yin J..(2021).Impact of parameterizing the turbulent orographic form drag on convection-permitting simulations of winds and precipitation over South China during the 2019 pre-summer rainy season.Atmospheric Research,263.
MLA	Xue H.,et al."Impact of parameterizing the turbulent orographic form drag on convection-permitting simulations of winds and precipitation over South China during the 2019 pre-summer rainy season".Atmospheric Research 263(2021).