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	Estimating photosynthetically active radiation at the Earth's surface from MODIS data
	Xia C. Z. ; Xiong L. Y. ; Ieee
	2004
关键词	PAR transmissivity Albedo MODIS temperate forest par
页码	4119-4122
英文摘要	Photosynthetically active radiation (PAR), known as solar radiation available for photosynthesis, regulates the rate of carbon fixed by plant. During PAR propagating from the top of atmosphere to the surface, they undergo Raleigh scattering absorption by ozone, Mie scattering, scattering and absorption by aerosols, and surface bi-directional reflection. Due to the difficulty of acquiring extensive ground-based observations, increasing efforts are being devoted to estimate PAR from satellite measurement. A new approach for PAR based on satellite algorithm is proposed in this study, which defines net surface PAR (NSPAR(SFC)) as the attenuated downward PAR at the TOA for the effects of atmospheric molecular, cloud, aerosol, and albedo caused by surface BRDF. Taking temperate forest area in northeast China as an example, it is tested as a practical tool in estimating NSPAR(SFC) using MODIS data and other auxiliary data. The results accuratelv show PAR dvnamics of temperate forest woodland from day to year, and are successfully applied to simulate net primary productivity of temperate forest in northeast China.
收录类别	CPCI
会议录出版者	Ieee
语种	英语
ISBN号	0-7803-8742-2
内容类型	会议论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/25323]
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	Xia C. Z.,Xiong L. Y.,Ieee. Estimating photosynthetically active radiation at the Earth's surface from MODIS data[C]. 见:.

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