%0 Journal Article
%T Effect of Macrophysical Parameters of Clouds on Broadband Solar Radiation (295-2800 nm) at a Subtropical Location<br>Effect of clouds macro-physical parameters in broadband solar radiation (295-2800 nm) at subtropical location
%A Mahmoud El-Nouby ADAM
%A <br>Mahmoud
%A El-Nouby
%A ADAM
%J 大气和海洋科学快报
%D 2011
%I 
%X The present study describes the effect of clouds (macro-physical parameters) on global solar radiation (G). Data from four years of hourly measurements of G on a horizontal surface were used. These data were collected at the South Valley University (SVU) meteorological research station (26.2°N, 32.7°E, 96 m above mean see level. In addition, the cloud modification factor for G (CMFG) was estimated in three cases: high-level, mid-level, and low-level clouds. For every level, the variation of hourly CMFG as a function of cloud amount (CA) was illustrated. A third-order polynomial between hourly values of CMFG and CA was established. Furthermore, the effect of CA in the attenuation of G relative to its corresponding value in cloudless conditions is discussed. For cloud cover > 88%, G was reduced by 54%, 34%, and 28% by low-, mid-, and high-level clouds, respectively.
%K extraterrestrial ultraviolet-B
%K hemispherical transmittance of UVB
%K Egypt<br>
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=E62459D214FD64A3C8082E4ED1ABABED5711027BBBDDD35B&cid=28A2F569B2458C17&jid=DFA1C03CBD38122A6831EBC757FD100F&aid=1AF9403469FF418754AB2383A124B4D0&yid=9377ED8094509821&vid=E158A972A605785F&iid=38B194292C032A66&sid=7EBE588F611589FC&eid=D46BA3D3D4B3C585&journal_id=1674-2834&journal_name=大气和海洋科学快报&referenced_num=0&reference_num=0