Abstract
Global solar radiation is the driving force in hydrological cycle especially for evapotranspiration (ET) and is quite infrequently measured. This has led to the reliance on indirect techniques of estimation for data scarce regions. This study presents an improved technique that uses information from a numerical weather prediction (NWP) model (National Centre for Atmospheric Research NCAR's Mesoscale Meteorological model version 5 MM5), for the determination of a cloud cover index (CI), a major factor in the attenuation of the incident solar radiation. The cloud cover index (CI) together with the atmospheric transmission factor (K<inf>T</inf>) and output from a global clear sky solar radiation were then used for the estimation of global solar radiation for the Brue catchment located in the southwest of England. The results clearly show an improvement in the estimated global solar radiation in comparison to the prevailing approaches.
Original language | English |
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Pages (from-to) | 13-22 |
Number of pages | 10 |
Journal | Journal of Atmospheric and Solar-Terrestrial Physics |
Volume | 129 |
DOIs | |
Publication status | Published - 1 Jul 2015 |
Research Groups and Themes
- Water and Environmental Engineering
Keywords
- Aerosol scattering
- Atmospheric transmissivity
- Clear sky radiation
- Cloud cover
- Diffuse radiation
- Global solar radiation
- Numerical weather model MM5
- Sunshine
- Upper atmospheric information