气候变化领域集成服务门户(CCPortal): How Accurately Can Satellite Products (TMPA and IMERG) Detect Precipitation Patterns, Extremities, and Drought Across the Nepalese Himalaya?

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DOI	10.1029/2020EA001315
	How Accurately Can Satellite Products (TMPA and IMERG) Detect Precipitation Patterns, Extremities, and Drought Across the Nepalese Himalaya?
	Sharma, Shankar; Khadka, Nitesh; Hamal, Kalpana; Shrestha, Dibas; Talchabhadel, Rocky; Chen, Yingying
通讯作者	Sharma, S (通讯作者)
发表日期	2020
EISSN	2333-5084
卷号	7 期号:8
英文摘要	This study aims to assess the accuracy of two satellite-based precipitation products (SBPPs), that is, Tropical Rainfall Measurement Mission (TRMM)-based Multi-satellite Precipitation Analysis (TMPA) and its upgraded version Integrated Multi-Satellite Retrievals for Global Precipitation Measurement (IMERG), in capturing spatial and temporal variation of precipitation and their application for extreme events (high-intensity precipitation and drought). They were evaluated against 142-gauge stations from Nepal during 2001-2018. The results show that, in general, both SBPPs show the overall characteristics of precipitation patterns, although underestimated the mean annual precipitation during the study period. It was also noted that IMERG product yields better performance to detect precipitation events (probability of detection) and no-precipitation events (false alarm ratio) than TMPA. Based on four different extreme precipitation indices: heavy precipitation events (R10mm), extreme precipitation events (R25mm), five consecutive dry days (CDD), and five consecutive wet days (CWD), it was observed that the SBPPs underestimated the frequency of R25mm and CDD spells while overestimated R10mm and CWD spells. Additionally, both SBPPs exhibited considerable capabilities in capturing the drought events during the study period. Overall, the drought event, bias, and frequency show that the IMERG product has slightly better capabilities to capture drought than the TMPA product. In general, IMERG was found to be superior at a daily timescale, while TMPA shows consistent performance on a monthly scale during the study period. Furthermore, there is still space for further improvement of IMERG rainfall retrieval algorithms.
关键词	GPM-IMERG RAINFALL PRODUCTS GAUGE DATA TRMM 3B42 DATA SETS REGION VALIDATION INDEX
语种	英语
WOS研究方向	Astronomy & Astrophysics ; Geology
WOS类目	Astronomy & Astrophysics ; Geosciences, Multidisciplinary
WOS记录号	WOS:000566210700012
来源期刊	EARTH AND SPACE SCIENCE
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/260014
推荐引用方式 GB/T 7714	Sharma, Shankar,Khadka, Nitesh,Hamal, Kalpana,et al. How Accurately Can Satellite Products (TMPA and IMERG) Detect Precipitation Patterns, Extremities, and Drought Across the Nepalese Himalaya?[J]. 中国科学院青藏高原研究所,2020,7(8).
APA	Sharma, Shankar,Khadka, Nitesh,Hamal, Kalpana,Shrestha, Dibas,Talchabhadel, Rocky,&Chen, Yingying.(2020).How Accurately Can Satellite Products (TMPA and IMERG) Detect Precipitation Patterns, Extremities, and Drought Across the Nepalese Himalaya?.EARTH AND SPACE SCIENCE,7(8).
MLA	Sharma, Shankar,et al."How Accurately Can Satellite Products (TMPA and IMERG) Detect Precipitation Patterns, Extremities, and Drought Across the Nepalese Himalaya?".EARTH AND SPACE SCIENCE 7.8(2020).