气候变化领域集成服务门户(CCPortal): The Convective-To-Total Precipitation Ratio and the “Drizzling” Bias in Climate Models

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DOI	10.1029/2020JD034198
	The Convective-To-Total Precipitation Ratio and the “Drizzling” Bias in Climate Models
	Chen D.; Dai A.; Hall A.
发表日期	2021
ISSN	2169-897X
卷号	126 期号:16
英文摘要	Overestimation of precipitation frequency and duration while underestimating intensity, that is, the “drizzling” bias, has been a long-standing problem of global climate models. Here we explore this issue from the perspective of precipitation partitioning. We found that most models in the Climate Model Intercomparison Project Phase 5 (CMIP5) have high convective-to-total precipitation (PC/PR) ratios in low latitudes. Convective precipitation has higher frequency and longer duration but lower intensity than non-convective precipitation in many models. As a result, the high PC/PR ratio contributes to the “drizzling” bias over low latitudes. The PC/PR ratio and associated “drizzling” bias increase as model resolution coarsens from 0.5° to 2.0°, but the resolution's effect weakens as the grid spacing increases from 2.0° to 3.0°. Some of the CMIP6 models show reduced “drizzling” bias associated with decreased PC/PR ratio. Thus, more reasonable precipitation partitioning, along with finer model resolution should alleviate the “drizzling” bias within current climate models. © 2021. American Geophysical Union. All Rights Reserved.
英文关键词	CMIP; model bias; model resolution; parameterizations; precipitation
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/237102
作者单位	Department of Atmospheric and Oceanic Sciences, University of California, Los Angeles, Los Angeles, CA, United States; Department of Atmospheric and Environmental Sciences, University at Albany, State University of New York, Albany, NY, United States
推荐引用方式 GB/T 7714	Chen D.,Dai A.,Hall A.. The Convective-To-Total Precipitation Ratio and the “Drizzling” Bias in Climate Models[J],2021,126(16).
APA	Chen D.,Dai A.,&Hall A..(2021).The Convective-To-Total Precipitation Ratio and the “Drizzling” Bias in Climate Models.Journal of Geophysical Research: Atmospheres,126(16).
MLA	Chen D.,et al."The Convective-To-Total Precipitation Ratio and the “Drizzling” Bias in Climate Models".Journal of Geophysical Research: Atmospheres 126.16(2021).