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	Estimation of incident photosynthetically active radiation from Moderate Resolution Imaging Spectrometer data
	Liang S. L. ; Zheng T. ; Liu R. G. ; Fang H. L. ; Tsay S. C. ; Running S.
	2006
关键词	modis atmosphere products solar-radiation satellite data multiple-scattering land model surface par climate scale reflectance
英文摘要	[ 1] Incident photosynthetically active radiation ( PAR) is a key variable needed by almost all terrestrial ecosystem models. Unfortunately, the current incident PAR products estimated from remotely sensed data at spatial and temporal resolutions are not sufficient for carbon cycle modeling and various applications. In this study, the authors develop a new method based on the look-up table approach for estimating instantaneous incident PAR from the polar-orbiting Moderate Resolution Imaging Spectrometer (MODIS) data. Since the top-of-atmosphere (TOA) radiance depends on both surface reflectance and atmospheric properties that largely determine the incident PAR, our first step is to estimate surface reflectance. The approach assumes known aerosol properties for the observations with minimum blue reflectance from a temporal window of each pixel. Their inverted surface reflectance is then interpolated to determine the surface reflectance of other observations. The second step is to calculate PAR by matching the computed TOA reflectance from the look-up table with the TOA values of the satellite observations. Both the direct and diffuse PAR components, as well as the total shortwave radiation, are determined in exactly the same fashion. The calculation of a daily average PAR value from one or two instantaneous PAR values is also explored. Ground measurements from seven FLUXNET sites are used for validating the algorithm. The results indicate that this approach can produce reasonable PAR product at 1 km resolution and is suitable for global applications, although more quantitative validation activities are still needed.
出处	Journal of Geophysical Research-Atmospheres
卷	111
期	D15
收录类别	SCI
语种	英语
ISSN号	0148-0227
内容类型	SCI/SSCI论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/23547]
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	Liang S. L.,Zheng T.,Liu R. G.,et al. Estimation of incident photosynthetically active radiation from Moderate Resolution Imaging Spectrometer data. 2006.

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