Spatial Downscaling of Monthly TRMM Precipitation Based on EVI and Other Geospatial Variables Over the Tibetan Plateau From 2001 to 2012

	Spatial Downscaling of Monthly TRMM Precipitation Based on EVI and Other Geospatial Variables Over the Tibetan Plateau From 2001 to 2012
	Shi, Yuli 1; Song, Lei 1
刊名	MOUNTAIN RESEARCH AND DEVELOPMENT
	2015
卷号	35 期号:2 页码:281-292
关键词	Precipitation random forests Moderate Resolution Imaging Spectroradiometer (MODIS) EVI spatial downscaling Tropical Rainfall Measuring Mission (TRMM) Tibetan Plateau
通讯作者	Shi, YL (reprint author), Nanjing Univ Informat Sci & Technol, Nanjing 210044, Jiangsu, Peoples R China.
英文摘要	Recent developments in hydrological modeling and biomass retrieval in complex mountain areas have heightened the need for accurate precipitation data at high spatial resolution. The Tropical Rainfall Measuring Mission (TRMM) provides rainfall estimates for certain climate models in mountain ranges where rain gauges are lacking. TRMM precipitation estimates, however, inherently have large uncertainties because of their coarse spatial resolution. In this study, we investigate a statistical downscaling calibration procedure to derive high-spatial-resolution (1-km) precipitation maps for the Tibetan Plateau using the satellite-based data set Enhanced Vegetation Index (EVI) from the Moderate Resolution Imaging Spectroradiometer, a digital elevation model from the Shuttle Radar Topography Mission, and the TRMM 3B43 product. Spatial downscaling from 0.25 degrees to 1 km was achieved by using the nonparametric statistic relationships between precipitation and EVI, altitude, slope, aspect, latitude, and longitude. An additive method was used to calibrate the downscaled precipitation data. The best 1-km resolution annual precipitation data for 2001-2012 over the Tibetan Plateau were generated through downscaling and additive calibration for most cases. The results show that the method improves the accuracy of rainfall estimates. Monthly 1-km precipitation data were also obtained by disaggregating 1-km annual downscaled estimates with monthly fractions of annual total precipitation. Monthly precipitation predictions are in good agreement with rain gauge data. The calibration of the monthly product with rain gauge data significantly reduced the bias value. Overall we conclude that the methodology is useful for areas with varied climate conditions and complex topography. These results have practical implications for calculating hydrological balances, mapping aboveground biomass, and assessing regional climate change.
研究领域[WOS]	Environmental Sciences ; Geography, Physical
收录类别	SCI
语种	英语
WOS记录号	WOS:000357456300009
内容类型	期刊论文
源URL	[http://ir.ceode.ac.cn/handle/183411/38441]
专题	遥感与数字地球研究所_SCI/EI期刊论文_期刊论文
作者单位	1.[Shi, Yuli 2.Song, Lei] Nanjing Univ Informat Sci & Technol, Nanjing 210044, Jiangsu, Peoples R China 3.[Shi, Yuli] Inst Remote Sensing & Digital Earth China Acad Sc, State Key Lab Remote Sensing Sci, Beijing 100101, Peoples R China
推荐引用方式 GB/T 7714	Shi, Yuli,Song, Lei. Spatial Downscaling of Monthly TRMM Precipitation Based on EVI and Other Geospatial Variables Over the Tibetan Plateau From 2001 to 2012[J]. MOUNTAIN RESEARCH AND DEVELOPMENT,2015,35(2):281-292.
APA	Shi, Yuli,&Song, Lei.(2015).Spatial Downscaling of Monthly TRMM Precipitation Based on EVI and Other Geospatial Variables Over the Tibetan Plateau From 2001 to 2012.MOUNTAIN RESEARCH AND DEVELOPMENT,35(2),281-292.
MLA	Shi, Yuli,et al."Spatial Downscaling of Monthly TRMM Precipitation Based on EVI and Other Geospatial Variables Over the Tibetan Plateau From 2001 to 2012".MOUNTAIN RESEARCH AND DEVELOPMENT 35.2(2015):281-292.