Transmission in Solar UV and Total Radiation for Different conditions of Cloud, Aerosol and Ozone at Seoul

Abstract:

In recent years there has been substantial attempts to model the radiative transfer for climatological and biological purposes. However, the incorporation of clouds, aerosols and ozone into the modeling process is one of the difficult tasks due to their variable transmission in both temporal and space domains.

The purpose of this study is to develop a multiple linear regression model for total transmission with respect to the clearness sky conditions and also to compare their individual transmissions of cloud, aerosol and ozone atmospheres seasonally, using the measured dataset at Seoul.

The transmission for broadband solar radiation (GS) is the most sensitive among the three solar radiation components of GS, total uv (TUV) and erythema uv (EUV), which is caused by the broadband covering visible through near infrared radiation. Clouds, on average, reduced TUV by 25 % and EUV by 22 % of the clear sky value, whereas reduces GS by 31 %. Similarly, aerosols reduced the two UV components by 21% on average, whereas reduced GS by 24 %. Ozone (total ozone) reduced the EUV transmission to 78 % of the clear sky value, on average.

Cloud transmissions was decreased with increasing cloud cover up to overcast condition (CC=10), reducing the transmission by average of 68 % , 56 % and 50 % of the clear sky's for GS, TUV and EUV radiation, respectively.