气候变化领域集成服务门户(CCPortal): Respective Advantages of Top-Down Based GPM IMERG and Bottom-Up Based SM2RAIN-ASCAT Precipitation Products Over the Tibetan Plateau

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DOI	10.1029/2020JD033946
	Respective Advantages of Top-Down Based GPM IMERG and Bottom-Up Based SM2RAIN-ASCAT Precipitation Products Over the Tibetan Plateau
	Fan, Yixi; Ma, Ziqiang; Ma, Yaoming; Ma, Weiqiang; Xie, Zhipeng; Ding, Leiding; Han, Yizhe; Hu, Wei; Su, Rongmingzhu
通讯作者	Ma, WQ (通讯作者)
发表日期	2021
ISSN	2169-897X
EISSN	2169-8996
卷号	126 期号:7
英文摘要	The Tibetan Plateau (TP) is characterized by complex topography and heterogeneous surface cover, which makes it difficult to obtain accurate precipitation data at a regional scale. Therefore, it is important to use dense ground observations to evaluate satellite-derived precipitation products. In this study, the top-down-based Global Precipitation Measurement Integrated MultisatellitE Retrievals (GPM IMERG) and bottom-up-based Soil Moisture TO RAIN-Advanced SCATterometer (SM2RAIN-ASCAT; SM2RASC) precipitation products were evaluated against 1,584 unevenly distributed rain gauges over the TP from May to October 2015. Results show: (1) The overall performances of IMERG and SM2RASC are comparable at the daily scale, with a higher correlation coefficient (CC) for IMERG and lower root-mean-square error (RMSE) for SM2RASC. Regarding the precipitation detectability, IMERG outperforms SM2RASC; (2) Spatially, SM2RASC shows better performance than IMERG in grasslands, but IMERG outperforms SM2RASC in forest areas, due to the low quality of the soil moisture retrieved by satellite in the areas; (3) The accuracy of both SM2RASC and IMERG is closely correlated with altitude and rainfall intensity. The SM2RASC product estimates light to moderate rainfall (5-25 mm/day) more accurately than the IMERG, but the IMERG product shows better performance for drizzle and heavy rainfall (>25 mm/day). Due to relatively frequent fluctuations of the ASCAT soil moisture product, SM2RASC frequently reports false rainfall in dry conditions. This study demonstrates the good performance of the SM2RASC product over the TP and suggests that the impact of vegetation density and topography should be considered for improving the SM2RAIN algorithm.
关键词	SOIL-MOISTURE SATELLITE PRECIPITATION RAINFALL PRODUCTS ANALYSIS TMPA VALIDATION CHALLENGES MICROWAVE
英文关键词	IMERG; rainfall; SM2RAIN-ASCAT; Tibetan Plateau
语种	英语
WOS研究方向	Meteorology & Atmospheric Sciences
WOS类目	Meteorology & Atmospheric Sciences
WOS记录号	WOS:000640969000046
来源期刊	JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/260317
推荐引用方式 GB/T 7714	Fan, Yixi,Ma, Ziqiang,Ma, Yaoming,et al. Respective Advantages of Top-Down Based GPM IMERG and Bottom-Up Based SM2RAIN-ASCAT Precipitation Products Over the Tibetan Plateau[J]. 中国科学院青藏高原研究所,2021,126(7).
APA	Fan, Yixi.,Ma, Ziqiang.,Ma, Yaoming.,Ma, Weiqiang.,Xie, Zhipeng.,...&Su, Rongmingzhu.(2021).Respective Advantages of Top-Down Based GPM IMERG and Bottom-Up Based SM2RAIN-ASCAT Precipitation Products Over the Tibetan Plateau.JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES,126(7).
MLA	Fan, Yixi,et al."Respective Advantages of Top-Down Based GPM IMERG and Bottom-Up Based SM2RAIN-ASCAT Precipitation Products Over the Tibetan Plateau".JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES 126.7(2021).