VERTICAL PROFILES OF AEROSOL OPTICAL THICKNESS OVER SYOWA STATION, ANTARCTICA
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Attenuation measurements of solar irradiance using an airborne sun photometer were performed for the first time over Syowa Station, Antarctica. The NIPR's Cessna 185 aircraft equipped with a sun photometer (Eko, Model MS-111) took 4 flights during JARE-25,on January 19,September 3,December 25 and 26,1984. The aerosol optical thicknesses (AOT) at wavelengths of 0.369,0.5,0.675 and 0.862μm were obtained at several altitudes up to 5km on each flight. The temporal change of vertical profiles of AOT confirmed that the decrease of AOT found in the ground-based measurements during 1984 (cf., M. SHIOBARA et al. : Mem. Natl Inst. Polar Res., Spec. Issue, 45,93,1986) reflects the depletion of stratospheric aerosols enhanced by the El Chichon eruption in 1982. The tropospheric AOT over Syowa Station was estimated as 0.005-0.01 at 0.5μm wavelength and was nearly comparable with the non-disturbed stratospheric AOT in contrast with the mid-latitude region where the tropospheric AOT constitutes most of the AOT of the whole atmosphere.
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- VERTICAL PROFILES OF AEROSOL OPTICAL THICKNESS OVER SYOWA STATION, ANTARCTICA