Estimation of incident Photosynthetically Active Radiation from MODIS, AVHRR and GOES data
Shunlin
Liang, University of Maryland, sliang@umd.edu
(Presenting)
Kaicun
Wang, University of Maryland, kcwang@umd.edu
Dongdong
Wang, University of Maryland, ddwang@umd.edu
John
Townshend, University of Maryland, jtownshe@geog.umd.edu
Si-Chee
Tsay, NASA/GSFC, si-chee.tsay-1@nasa.gov
Steve
Running, University of Montana, swr@ntsg.umt.edu
Incident photosynthetically active radiation (PAR) is a key variable required by almost all terrestrial ecosystem models. Unfortunately, the current incident PAR products estimated from remotely sensed data or calculated by GCM models at spatial and temporal resolutions are not sufficient for carbon cycle modeling and various applications. With funding supports from NASA, we have generated incident PAR products over North America from the polar-orbiting Moderate Resolution Imaging Spectrometer (MODIS) and Advanced Very High Resolution Radiometer (AVHRR) data, and Geostationary Operational Environmental Satellite (GOES) data.
The basic idea of the algorithms is primarily based on a look-up table method using the temporal signature of remote sensing observations. The temporal observations of each pixel are used to estimate land surface reflectance and look-up tables of both aerosol and cloud are searched, based on the top-of-atmosphere reflectance and surface reflectance for determining incident PAR, including both the direct and diffuse components. The calculation of a daily average PAR value using different methods is also explored. Extensive validation activities are conducted to evaluate the algorithm and products using the ground measurements from several observation networks. The results indicate that this approach can produce reasonable PAR product at 1km resolution and is suitable for global applications.
'Producing High-Resolution Land Surface Incident PAR Product from Multiple Satellite Data', S. Liang (PI) & S. C. Tsay, NASA 'Mapping High-Resolution Incident Photosynthetically Active Radiation Product for the North American Carbon Program', S. Liang (PI), S. Running, J. Townshend, and S. C. Tsay, NASA
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