Abstract
Net radiation plays an essential role in determining the thermal conditions of the Earth’s surface and is an important parameter for the study of land-surface processes and global climate change. In this paper, an improved satellite-based approach to estimate the daily net radiation is presented, in which sunshine duration were derived from the geostationary meteorological satellite (FY-2D) cloud classification product, the monthly empirical as and bs Angstrom coefficients for net shortwave radiation were calibrated by spatial fitting of the ground data from 1997 to 2006, and the daily net longwave radiation was calibrated with ground data from 2007 to 2010 over the Heihe River Basin in China. The estimated daily net radiation values were validated against ground data for 12 months in 2008 at four stations with different underlying surface types. The average coefficient of determination (R2) was 0.8489, and the averaged Nash-Sutcliffe equation (NSE) was 0.8356. The close agreement between the estimated daily net radiation and observations indicates that the proposed method is promising, especially given the comparison between the spatial distribution and the interpolation of sunshine duration. Potential applications include climate research, energy balance studies and the estimation of global evapotranspiration.
Highlights
Net radiation (Rn ) is the balance between the downward and upward shortwave and longwave radiation and is a key component of the Earth’s surface energy balance
The objective of this study was to investigate an improved method to derive daily net radiation based on remote sensing products coupled with field measurement data
We focused on calculating global solar radiation based on sunshine duration from Feng-Yun (FY)-2D geostationary meteorological
Summary
Net radiation (Rn ) is the balance between the downward and upward shortwave and longwave radiation and is a key component of the Earth’s surface energy balance It is the main source of energy for the physical and chemical processes that occur in the surface-atmosphere interface, the heat and water budgets, photosynthesis [1] and evapotranspiration [2], which are used as input for global and regional climate change and eco-hydrological models. Net radiation can be reliably obtained using net radiometers or shortwave and longwave radiometers, and it is routinely recorded at meteorological and radiation stations Such instruments are accurate for measuring net radiation at a station (representative for a certain area), their use for large regional net radiation assessments is time consuming and expensive because numerous ground installations are required, especially when large spatial coverage and a high sampling frequency are desired. Few national radiation stations exist, resulting in insufficient net radiation data in some areas
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