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DOI	10.1016/j.rse.2020.111697
	Have satellite precipitation products improved over last two decades? A comprehensive comparison of GPM IMERG with nine satellite and reanalysis datasets
	Tang G.; Clark M.P.; Papalexiou S.M.; Ma Z.; Hong Y.
发表日期	2020
ISSN	00344257
卷号	240
英文摘要	The Integrated Multi-satellitE Retrievals for Global Precipitation Measurement (IMERG) produces the latest generation of satellite precipitation estimates and has been widely used since its release in 2014. IMERG V06 provides global rainfall and snowfall data beginning from 2000. This study comprehensively analyzes the quality of the IMERG product at daily and hourly scales in China from 2000 to 2018 with special attention paid to snowfall estimates. The performance of IMERG is compared with nine satellite and reanalysis products (TRMM 3B42, CMORPH, PERSIANN-CDR, GSMaP, CHIRPS, SM2RAIN, ERA5, ERA-Interim, and MERRA2). Results show that the IMERG product outperforms other datasets, except the Global Satellite Mapping of Precipitation (GSMaP), which uses daily-scale station data to adjust satellite precipitation estimates. The monthly-scale station data adjustment used by IMERG naturally has a limited impact on estimates of precipitation occurrence and intensity at the daily and hourly time scales. The quality of IMERG has improved over time, attributed to the increasing number of passive microwave samples. SM2RAIN, ERA5, and MERRA2 also exhibit increasing accuracy with time that may cause variable performance in climatological studies. Even relying on monthly station data adjustments, IMERG shows good performance in both accuracy metrics at hourly time scales and the representation of diurnal cycles. In contrast, although ERA5 is acceptable at the daily scale, it degrades at the hourly scale due to the limitation in reproducing the peak time, magnitude and variation of diurnal cycles. IMERG underestimates snowfall compared with gauge and reanalysis data. The triple collocation analysis suggests that IMERG snowfall is worse than reanalysis and gauge data, which partly results in the degraded quality of IMERG in cold climates. This study demonstrates new findings on the uncertainties of various precipitation products and identifies potential directions for algorithm improvement. The results of this study will be useful for both developers and users of satellite rainfall products. © 2020 Elsevier Inc.
英文关键词	Diurnal cycle; Error analysis; IMERG; Reanalysis precipitation; Satellite precipitation; Snowfall
语种	英语
scopus关键词	Error analysis; Quality control; Rain; Rain gages; Snow; Soil moisture; Comprehensive comparisons; Diurnal cycle; Global precipitation measurements; IMERG; Reanalysis; Satellite precipitation; Satellite precipitation estimates; Satellite precipitation products; Satellites; algorithm; diurnal variation; error analysis; magnitude; precipitation assessment; raingauge; satellite altimetry; snow; China
来源期刊	Remote Sensing of Environment
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/179395
作者单位	University of Saskatchewan Coldwater Lab, Canmore, Alberta T1W 3G1, Canada; Centre for Hydrology, University of Saskatchewan, Saskatoon, Saskatchewan S7N 1K2, Canada; State Key Laboratory of Hydroscience and Engineering, Department of Hydraulic Engineering, Tsinghua University, Beijing, 100084, China; Department of Civil, Geological and Environmental Engineering, University of SaskatchewanSaskatchewan S7N 1K2, Canada; Faculty of Environmental Sciences, Czech University of Life Sciences Prague, Czech Republic; Institute of Remote Sensing and Geographical Information System, School of Earth and Space Sciences, Peking University, Beijing, 100871, China; School of Civil Engineering and Environmental Science, University of Oklahoma, Norman, OK 73019, United States
推荐引用方式 GB/T 7714	Tang G.,Clark M.P.,Papalexiou S.M.,et al. Have satellite precipitation products improved over last two decades? A comprehensive comparison of GPM IMERG with nine satellite and reanalysis datasets[J],2020,240.
APA	Tang G.,Clark M.P.,Papalexiou S.M.,Ma Z.,&Hong Y..(2020).Have satellite precipitation products improved over last two decades? A comprehensive comparison of GPM IMERG with nine satellite and reanalysis datasets.Remote Sensing of Environment,240.
MLA	Tang G.,et al."Have satellite precipitation products improved over last two decades? A comprehensive comparison of GPM IMERG with nine satellite and reanalysis datasets".Remote Sensing of Environment 240(2020).