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	Evaluation of high-resolution satellite precipitation products using rain gauge observations over the Tibetan Plateau
	Gao Y. C. ; Liu M. F.
	2013
关键词	global precipitation complex terrain neural-network imagery system validation monsoon models scales river
英文摘要	High-resolution satellite precipitation products are very attractive for studying the hydrologic processes in mountainous areas where rain gauges are generally sparse. Four high-resolution satellite precipitation products are evaluated using gauge measurements over different climate zones of the Tibetan Plateau (TP) within a 6 yr period from 2004 to 2009. The four satellite-based precipitation data sets are: Tropical Rainfall Measuring Mission (TRMM) Multisatellite Precipitation Analysis 3B42 version 6 (TMPA) and its Real Time version (TMPART), Climate Prediction Center Morphing Technique (CMOPRH) and Precipitation Estimation from Remotely Sensed Information using Artificial Neural Network (PERSIANN). TMPA and CMORPH, with higher correlation coefficients and lower root mean square errors (RMSEs), show overall better performance than PERSIANN and TMPART. TMPA has the lowest biases among the four precipitation data sets, which is likely due to the correction process against the monthly gauge observations from global precipitation climatology project (GPCP). TMPA also shows large improvement over TMPART, indicating the importance of gauge-based correction on accuracy of rainfall. The four products show better agreement with gauge measurements over humid regions than that over arid regions where correlation coefficients are less than 0.5. Moreover, the four precipitation products generally tend to overestimate light rainfall (0-10 mm) and underestimate moderate and heavy rainfall (> 10 mm). Moreover, this study extracts 24 topographic variables from a DEM (digital elevation model) and uses a linear regression model to explore the bias-topography relationship. Results show that biases of TMPA and CMORPH present weak dependence on topography. However, biases of TMPART and PERSIANN present dependence on topography and variability of elevation and surface roughness plays important roles in explaining their biases.
出处	Hydrology and Earth System Sciences
卷	17
期	2
页	837-849
收录类别	SCI
语种	英语
ISSN号	1027-5606
内容类型	SCI/SSCI论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/30548]
专题	地理科学与资源研究所_历年回溯文献
推荐引用方式 GB/T 7714	Gao Y. C.,Liu M. F.. Evaluation of high-resolution satellite precipitation products using rain gauge observations over the Tibetan Plateau. 2013.

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