Proceedings of the KSRS Conference (대한원격탐사학회:학술대회논문집)
- Volume 2
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- Pages.794-796
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- 2006
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- 1226-9743(pISSN)
THE MODIFIED BRIGHTNESS TEMPERATURE DIFFERENCE FOR AEROSOL DETECTION
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Kim, Jae-Hwan
(Department of Atmospheric Science, Pusan National University)
;
- Ha, Jong-Sung (Department of Atmospheric Science, Pusan National University) ;
- Lee, Hyun-Jin (Department of Atmospheric Science, Pusan National University)
- Published : 2006.11.02
Abstract
This study investigated the Brightness Temperature Difference threshold as criterion between aerosols and clouds in conjunction with radiative transfer model. Surface temperature is caused by a significant error over 50% in the BTD threshold. In addition, The BTD threshold contains the uncertainties about 20% due to the surface emissivity and 8% due to the satellite zenith angle. Therefore, we have composed the Look-up table for BTD between 11㎛and 12㎛ according to satellite zenith angle, surface temperature, and surface emissivity. The modified BTD show the enhanced signal, especially over bright surface such as desert in China. However, a weak aerosol signal over Ocean remains in the modified BTD.