Abstract
Instantaneous radiative flux components across different climatic regions of USA were computed using Moderate Resolution Imaging Spectroradiometer (MODIS) land, atmosphere and geo-location products for clear sky pixels, colocated in time and space with flux towers. Satellite derived fluxes were validated using in-situ SURFRAD flux tower data of the respective sites. Significant positive correlation was observed between simulated and observed fluxes especially for incoming shortwave (r = 0.94), incoming longwave (r = 0.91) and outgoing shortwave (r = 0.89) radiation. The root mean square errors (RMSE) were 50.7, 10.41, 18.54 and 33.50 Wm−2 for incoming shortwave, outgoing shortwave, incoming longwave and outgoing longwave fluxes respectively with their corresponding relative RMSE of 0.11, 0.10, 0.06 and 0.08. The D-index and modeling efficiency (ME) varied from 0.87 to 0.96 and 0.61 to 0.85 respectively, indicated good performance of the present method. The coefficient of residual mass (CRM) for all the fluxes yielded values close to zero except incoming longwave radiation. Based on the statistical analysis and accumulative score highest rank was obtained for incoming longwave flux followed by outgoing shortwave, incoming shortwave and outgoing longwave fluxe. From the rank values it can be concluded that the present model predicted all the fluxes satisfactorily except the outgoing longwave flux.
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