HR: 0800h
AN: A11A-0044    [Abstracts]
TI: Effects of Aerosol Optical Depth on diffuse UV and visible radiation
AU: Kim, Y
EM: ghompang2@yonsei.ac.kr
AF: Yonsei University, Yonsei University 134 Sinchon-dong, Seodaemun-gu, Seoul 120- 749, Korea, Seoul, 120-749, Korea, Republic of
AU: * Kim, J
EM: jkim2@yonsei.ac.kr
AF: Yonsei University, Yonsei University 134 Sinchon-dong, Seodaemun-gu, Seoul 120- 749, Korea, Seoul, 120-749, Korea, Republic of
AU: Cho, H
EM: chk@yonsei.ac.kr
AF: Yonsei University, Yonsei University 134 Sinchon-dong, Seodaemun-gu, Seoul 120- 749, Korea, Seoul, 120-749, Korea, Republic of
AU: Kim, Y
AF: GIST, 261 Cheomdan-gwagiro (Oryong-dong), Buk-gu, Gwangju 500-712 Republic of Korea, Gwangju, 500-712, Korea, Republic of
AB: Ultraviolet radiation (UV, 300-367nm) was measured with a UV-multifilter rotating shadowband radiometer (UV- MFRSR) at Yonsei University, Seoul (37.57°N, 126.97°) for 7 months from January to July 2006 and visible irradiance (400-700 nm) also measured with a MFRSR for 12 months of 2006 at the same station. Spectral UV_AOD and vis_AOD were retrieved using the Langley method and Beer-Bouguer-Lambert's law, and compared with AOD obtained from Skyradiometer to validate their values. The diffuse and direct irradiance were analyzed to investigate the dependence on total optical depth (TOD) and aerosol optical depth (AOD). The direct-horizontal solar irradiance decreases exponentially as the optical depth increases according to the Beer- Bouguer-Lambert's Law. As the TOD and AOD increase, the diffuse-horizontal UV radiation gradually increases and shows a maximum value at some critical optical depth for a given SZA. Similar analysis was performed on the relation between the diffuse irradiance and AOD. RAF(radiation amplification factor) was used to correct the ozone effects on UV. These results provide empirical equations for the amount of diffuse irradiance in UV and visible wavelengths.
DE: 0321 Cloud/radiation interaction
DE: 0360 Radiation: transmission and scattering
SC: Atmospheric Sciences [A]
MN: 2007 Fall Meeting