气候变化领域集成服务门户(CCPortal): Drought monitoring in Yunnan Province based on a TRMM precipitation product

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DOI	10.1007/s11069-020-04276-2
	Drought monitoring in Yunnan Province based on a TRMM precipitation product
	Yu Y.; Wang J.; Cheng F.; Deng H.; Chen S.
发表日期	2020
ISSN	0921030X
起始页码	2369
结束页码	2387
卷号	104 期号:3
英文摘要	Yunnan Province is a region with frequent droughts; thus, drought monitoring research is important for implementing active and effective measures to mitigate drought and scientifically guide agricultural production. In this study, the Tropical Rainfall Measuring Mission (TRMM 3B43) remote sensing-based product is used as the data source, and a geographically weighted regression (GWR) model, normalized difference vegetation index (NDVI) data and gross primary productivity (GPP) are used as independent variables. The TRMM 3B43 data are downscaled to 1 km spatial resolution to obtain two downscaled precipitation models (GWR_NDVI and GWR_GPP). The precipitation anomaly percentage (Pa) index and the tropical rainfall condition index (TRCI) are used to evaluate the drought situation in Yunnan Province from 2009 to 2018, and the standardized precipitation index (SPI) and standardized precipitation evapotranspiration index (SPEI) are used to verify the Pa and TRCI. The results show the following: (1) With an R2 as high as 0.8821 and BIAS close to zero, the TRMM 3B43 monthly precipitation is significantly correlated with the measured precipitation. The GWR_NDVI data increase the R2 at the monthly scale by 0.0114; the GWR_NDVI data show greater improvements from spring and winter than from summer and autumn; and the R2 of the GWR_NDVI data for some sites are slightly reduced. The R2 of GWR_GPP data is smaller than that of the TRMM data and GWR_NDVI data at all timescales. (2) Drought occurs every month from 2009 to 2018; it decreases from November to February of the following year and is generally alleviated from March to April; and the incidence of drought from 2009 to 2014 is generally higher than that from 2015 to 2018. The Pa and TRCI show strong correlations with the SPI and SPEI and thus can be used to effectively monitor drought events in Yunnan, although the degree of drought assessed by the Pa and TRCI differs. (3) The spatial distribution of precipitation in Yunnan Province shows little precipitation in the north and east but abundant precipitation in the south and west. Precipitation is mainly concentrated from May to October, with the most abundant precipitation occurring in July. © 2020, Springer Nature B.V.
关键词	Drought GWR Pa TRCI TRMM Yunnan Province
英文关键词	drought; mitigation; NDVI; numerical model; precipitation intensity; rainfall; regression analysis; satellite data; satellite imagery; TRMM; China; Yunnan; Varanidae
语种	英语
来源期刊	Natural Hazards
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/206034
作者单位	College of Tourism and Geographic Sciences, Yunnan Normal University, Kunming, Yunnan 650500, China; Key Laboratory of Resources and Environmental Remote Sensing for Universities in Yunnan, Kunming, 650500, China; Center for Geospatial Information Engineering and Technology of Yunnan Province, Kunming, 650500, China
推荐引用方式 GB/T 7714	Yu Y.,Wang J.,Cheng F.,et al. Drought monitoring in Yunnan Province based on a TRMM precipitation product[J],2020,104(3).
APA	Yu Y.,Wang J.,Cheng F.,Deng H.,&Chen S..(2020).Drought monitoring in Yunnan Province based on a TRMM precipitation product.Natural Hazards,104(3).
MLA	Yu Y.,et al."Drought monitoring in Yunnan Province based on a TRMM precipitation product".Natural Hazards 104.3(2020).