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	Variational merged of hourly gauge-satellite precipitation in China: Preliminary results
	Li H.; Hong, Y.; Xie, P. P.; Gao, J. D.; Niu, Z.; Kirstetter, P.; Yong, B.
	2015
关键词	passive microwave sensors global precipitation recursive filter radar-rainfall assimilation model products system interpolation information
英文摘要	The article describes a variational scheme for the analysis of high-resolution hourly precipitation from China Meteorological Administration gauges and NOAA CMORPH satellite products in China and tests their impact on data-sparse regions and the heavy rainfall occurrences during the summer season (June-August 2009). In the variational scheme, a cost function is defined to measure the distance between analyzed precipitation field and observed rainfall quantity. A recursive filter is incorporated into the cost function which helps spread the observations to nearby grid points. Then a quasi-Newton method is used to solve the optimal estimation problem by minimizing the cost function. The adjoint technique is used to derive the gradient of cost function with respect to analysis precipitation. A series of experiments are performed to intercompare the variational analysis with the original CMORPH satellite products (CMP) and the bias-adjusted satellite products (Adj-CMP) against the observations. The best overall performance is from the variational analysis especially rainfall intensity by more than 10 mm h(-1) with a prevailing mean relative spatial bias nearly reduction zero, and the correlation coefficient is almost around 0.5 in convection active areas. Ground cross-validation experiments in which each affected station is withdrawn at once indicated that the variational analysis can particularly be beneficial and subsequent investigation of heavy rainfall events. It also reveals that the precipitation analysis field has the ability to improve the accuracy of rainfall estimation and capture the spatial precipitation pattern agreements in relatively data-sparse regions.
出处	Journal of Geophysical Research-Atmospheres
卷	120
期	19
语种	英语
ISSN号	2169-897X
DOI标识	10.1002/2015jd023710
内容类型	SCI/SSCI论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/43547]
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	Li H.,Hong, Y.,Xie, P. P.,et al. Variational merged of hourly gauge-satellite precipitation in China: Preliminary results. 2015.

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