气候变化领域集成服务门户(CCPortal): Differences in the Diurnal Variation of Precipitation Estimated by Spaceborne Radar, Passive Microwave Radiometer, and IMERG

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DOI	10.1029/2020JD033020
	Differences in the Diurnal Variation of Precipitation Estimated by Spaceborne Radar, Passive Microwave Radiometer, and IMERG
	Hayden L.; Liu C.
发表日期	2021
ISSN	2169897X
卷号	126 期号:9
英文摘要	Accurate, high-resolution measurements of the precipitation diurnal cycle are important for understanding local variations in precipitation and the underlying processes which cause them. Combining 16 years of measurements from the Tropical Rainfall Measuring Mission (TRMM) Precipitation Radar (PR) and 4 years from the Global Precipitation Measurement (GPM) Dual-frequency Precipitation Radar (DPR) creates a 20-year mean of near surface precipitation rate at 0.1° × 0.1°, hourly resolution from 35°N to 35°S. Similar data sets are created using the same proportions of the TRMM Microwave Imager and GPM Microwave Imager measurements, and 18 years of the Integrated Multi-satellitE Retrievals for GPM (IMERG) precipitation product. The phase and amplitude of the diurnal variation from each data set are calculated at each grid point using a fast Fourier transform (FFT). The satellite data are validated with 14 years of hourly National Climatic Data Center rain gauge measurements over the southeast United States by applying the same FFT method. Spaceborne radar best represents the unaveraged magnitude and diurnal phase measured by the gauges in this region. Time delays are found in precipitation retrievals from passive microwave observations as well as in the IMERG product. The strengths and weaknesses of these high-resolution data sets in determining the diurnal cycle of precipitation on a climatological scale are discussed across the tropics and subtropics. In general, when compared to PR and DPR retrievals, IMERG overestimates the global precipitation and has varying time lags, which tend to be larger and earlier over regions where organized convective systems are common. © 2021. American Geophysical Union. All Rights Reserved.
英文关键词	diurnal; IMERG; passive microwave; precipitation; satellite; spaceborne radar
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/185226
作者单位	Department of Physical and Environmental Sciences, Texas A&M University at Corpus Christi, Corpus Christi, TX, United States; Texas A&M University at Corpus Christi, Corpus Christi, TX, United States
推荐引用方式 GB/T 7714	Hayden L.,Liu C.. Differences in the Diurnal Variation of Precipitation Estimated by Spaceborne Radar, Passive Microwave Radiometer, and IMERG[J],2021,126(9).
APA	Hayden L.,&Liu C..(2021).Differences in the Diurnal Variation of Precipitation Estimated by Spaceborne Radar, Passive Microwave Radiometer, and IMERG.Journal of Geophysical Research: Atmospheres,126(9).
MLA	Hayden L.,et al."Differences in the Diurnal Variation of Precipitation Estimated by Spaceborne Radar, Passive Microwave Radiometer, and IMERG".Journal of Geophysical Research: Atmospheres 126.9(2021).