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DOI	10.1029/2019JD032150
	Effects of Convection Representation and Model Resolution on Diurnal Precipitation Cycle Over the Indian Monsoon Region: Toward a Convection-Permitting Regional Climate Simulation
	Konduru R.T.; Takahashi H.G.
发表日期	2020
ISSN	2169897X
卷号	125 期号:16
英文摘要	This study investigated the reproducibility of rainfall characteristics of the Indian summer monsoon using a regional climate model (RCM), focusing on the convection representation and model horizontal grid resolution. To understand the importance of convection representation and model horizontal grid resolution, the study employed the Weather Research and Forecasting model WRFv3.8.1 as the RCM. Two series of experiments, that is, cumulus parameterization on/off (CON/COFF), were performed for the monsoon with three different spatial resolutions. Three contrasting monsoon years were selected for the simulations. The simulated rainfalls were evaluated with the India Meteorological Department data set and Tropical Rainfall Measurement Mission 3B42 Version 7. The results revealed that COFF captured fundamental aspects of the rainfall characteristics, such as diurnal cycle, rainfall intensity, and rainfall frequency. Over central India, in COFF, the diurnal precipitation peaks were simulated in afternoon/evening in close agreement with the observations. However, the diurnal precipitation peak in CON appeared 3–6 hr earlier than the observations. The diurnal precipitation variation was more associated with the horizontal grid resolution of the numerical model than representation of convection. Additionally, COFF could simulate diurnally propagating rainfall systems over the Bay of Bengal. Over the Indian land area, COFF simulated less-frequent intense precipitation systems, whereas CON simulated more-frequent widespread weak precipitation. This study demonstrated that convection representation is very important for simulation of diurnal rainfall systems over the Indian monsoon region, although refinement of model horizontal grid resolution is required over mountainous regions, where precipitation is closely related to orography. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	convection-permitting simulation; cumulus parameterization; diurnal precipitation cycle; Indian summer monsoon; model horizontal grid resolution
语种	英语
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/185834
作者单位	Department of Geography, Tokyo Metropolitan University, Tokyo, Japan
推荐引用方式 GB/T 7714	Konduru R.T.,Takahashi H.G.. Effects of Convection Representation and Model Resolution on Diurnal Precipitation Cycle Over the Indian Monsoon Region: Toward a Convection-Permitting Regional Climate Simulation[J],2020,125(16).
APA	Konduru R.T.,&Takahashi H.G..(2020).Effects of Convection Representation and Model Resolution on Diurnal Precipitation Cycle Over the Indian Monsoon Region: Toward a Convection-Permitting Regional Climate Simulation.Journal of Geophysical Research: Atmospheres,125(16).
MLA	Konduru R.T.,et al."Effects of Convection Representation and Model Resolution on Diurnal Precipitation Cycle Over the Indian Monsoon Region: Toward a Convection-Permitting Regional Climate Simulation".Journal of Geophysical Research: Atmospheres 125.16(2020).