气候变化领域集成服务门户(CCPortal): Assessment of GPM IMERG satellite precipitation estimation and its dependence on microphysical rain regimes over the mountains of south-central Chile

CCPortal

DOI	10.1016/j.atmosres.2021.105454
	Assessment of GPM IMERG satellite precipitation estimation and its dependence on microphysical rain regimes over the mountains of south-central Chile
	Rojas Y.; Minder J.R.; Campbell L.S.; Massmann A.; Garreaud R.
发表日期	2021
ISSN	0169-8095
卷号	253
英文摘要	Satellite data provide crucial information for those places lacking precipitation observations from ground-based sensors, especially over oceans, mountain regions, or developing countries. This is the case over much of South America, including Chile, a country with complex topography that has limited long-term precipitation records and high-elevation data, and no operational weather radars. This study focuses on investigating the skill of the Global Precipitation Measurement (GPM) Integrated Multi-Satellite Retrieval for GPM (IMERG: version 6) quantitative precipitation estimation (QPE). IMERG is assessed against ground-based observations from two field campaigns that took place near 36°S: The Chilean Coastal Orographic Precipitation Experiment (CCOPE; winter 2015), which collected data over the coastal mountain range, and The Chilean Orographic and Mesoscale Precipitation Study (ChOMPS; winter 2016), which collected observations in a transect from the coast to the Andes. To characterize how IMERG performance depends on microphysical regime, we used data from profiling radars and rain gauge measurements to classify rainfall into regimes including “ice-initiated rain” and “warm rain”, characterized by the presence or absence of a well-defined melting layer respectively. Rain gauge data was used to evaluate performance of IMERG QPE overall and for these two regimes. IMERG depicts the general spatial pattern of observed orographic enhancement but highly underestimates the magnitude of this enhancement. At higher elevations during CCOPE, IMERG underestimated the total amount of rainfall by 50%, while during ChOMPS the underestimation was by 16%. For CCOPE, at higher elevation sites, IMERG underestimated ice-initiated rain by 30% and underestimated warm rain by 70%. For ChOMPS, the underestimation at the Andes site was 33% for ice-initiated rain and 50% for warm rain. IMERG QPE for both field campaigns showed larger underestimations for warm rain periods and at higher elevations than for ice-initiated rain periods. Documenting how IMERG performance varies with terrain and microphysical regime may help guide improvements to satellite-based QPE. © 2021 Elsevier B.V.
英文关键词	Andes; GPM-IMERG; Micro Rain Radar; Microphysics; Orographic Precipitation
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/236865
作者单位	Department of Atmospheric and Environmental Sciences, University at Albany, State University of New York, Albany, NY, United States; Contour Group, Salt Lake City, UT, United States; Department of Earth and Environmental Engineering, Columbia University, New York, United States; Geophysics Department, Universidad de Chile, Santiago, Chile
推荐引用方式 GB/T 7714	Rojas Y.,Minder J.R.,Campbell L.S.,et al. Assessment of GPM IMERG satellite precipitation estimation and its dependence on microphysical rain regimes over the mountains of south-central Chile[J],2021,253.
APA	Rojas Y.,Minder J.R.,Campbell L.S.,Massmann A.,&Garreaud R..(2021).Assessment of GPM IMERG satellite precipitation estimation and its dependence on microphysical rain regimes over the mountains of south-central Chile.Atmospheric Research,253.
MLA	Rojas Y.,et al."Assessment of GPM IMERG satellite precipitation estimation and its dependence on microphysical rain regimes over the mountains of south-central Chile".Atmospheric Research 253(2021).