Physics
Scientific paper
Oct 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002jastp..64.1631i&link_type=abstract
Journal of Atmospheric and Solar-Terrestrial Physics, Volume 64, Issue 15, p. 1631-1643.
Physics
1
Scientific paper
In spite of their practicability, most classical models are not versatile but rather restrictive in their application. Consequently, their applicability for a particular location depends largely on validation against actual measurements. Global solar radiation parameterizations have been evaluated in this study for a lowland and a mountain site. Tested models were broadly categorised as cloud-based (Kasten) and sunshine-based (Ångström-Prescott, Garg and Garg, Sivkov). Data sets utilised for the evaluation extended from 1991 to 1994. Adjustable parameters in the models were determined. Observed monthly mean values of solar radiation /G and those estimated using Kasten model agreed within 2.5% for the lowland site and 13% for the mountain site. Root mean square errors of estimated hourly values of /G using Kasten model appreciated significantly with fractional cloud cover /N (particularly for /N>4 octals). For the study sites as well as other locations examined here, Ångström-Prescott coefficients did not show a distinctive trend with respect to season, geographical co-ordinate or altitude. Monthly mean values of /G estimated using Ångström-Prescott model agreed with observation within 2.5% for the lowland site and 3.4% for the mountain site. The effect of air mass, latitude and water vapour terms on the Ångström-Prescott relation has also been investigated. In general, Ångström-Prescott as well as Garg and Garg models yielded the least RMSE /(<0.047) for the study sites and are thus recommended for estimating /G for an arbitrary location.
Iziomon Moses G.
Mayer Helmut
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