UV and global solar radiation in Łódź, Central Poland

摘要: With the overall aim of quantifying urban atmospheric effects on different parts solar spectrum, a multi year analysis data collected at Łodź was undertaken. UV (290–400 nm) and global radiation measured by means Kipp Zonen CUV3 radiometer CM11 pyranometer in center between 1997 2001 are analysed. The mean annual sum equaled 3710.8 MJ m−2 154.1 m−2, respectively. minimum monthly total energy occurred December (48.7 M Jm−2—global; 2.1 m−2—UV); however, maximum atypically May (620.9 m−2—global; 25.3 m−2—UV). clearness index (Kuv) is approximately half radiation, indicating greater attenuation that part spectrum (Kuv 0.14 to 0.26 May). A linear regression model fitted daily values (g) irradiation (Duv = + Dgb). slope coefficient b determination equal 0.039 0.98, Cloudiness exerts an important control flux ground level for relation radiation. convective clouds caused increase irradiance about 10–20% compared clear days, enhancement resulting from reflections. On comprises 3.3–4% (10-min values) average, while during cloudy weather it increases 8%. results presented have implications understanding radiative transfer atmosphere over area influence transmission flux. Copyright © 2009 Royal Meteorological Society