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	A new method based on remote sensing observations and data assimilation for estimation of evapotranspiration over field crops
	Qin Y. ; Liu R. G. ; Liang S. L. ; Zhang H. ; Hu B.
	2007
关键词	evapotranspiration data assimilation field crops weak constraint surface-energy balance constraint data assimilation evaporative fraction parameter-estimation heat fluxes temperature strategies components inverse daytime
英文摘要	Much research has focused on the estimation of evapotranspiration (ET) over field crops for agricultural applications such as irrigation scheduling. In this research, a variational data assimilation scheme is developed based on the weak constraint concept. It assimilates surface skin temperature into a simple land surface model for estimation of ET. An automatic differentiation technique is used to derive the adjoint codes to evaluate the gradient of the cost function. After construction of this assimilation system, application case studies are examined to test its performance over field crops. The results show that ET can be retrieved with highly satisfactory accuracy.
出处	New Zealand Journal of Agricultural Research
卷	50
期	5
页	997-1004
收录类别	SCI
语种	英语
ISSN号	0028-8233
内容类型	SCI/SSCI论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/23171]
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	Qin Y.,Liu R. G.,Liang S. L.,et al. A new method based on remote sensing observations and data assimilation for estimation of evapotranspiration over field crops. 2007.

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