경험적 방법을 이용한 GOCI 해양탑제체용 adom 추정 알고리즘 개발에 관한 연구

Abstract

This study uses empirical method to estimate absorption coefficient of colored dissolved organic matter (adom) from GOCI satellite data with the relationship between band ratio of remote sensing reflectance (Rrs) and adom. For development of adom estimation algorithm, the used data is in-situ data about ocean optical properties in the around seawater area of the Korean Peninsula during 1998 – 2005. The relationship of Rrs(412)/Rrs(555), Rrs(443)/Rrs(555), Rrs(490)/Rrs(555), Rrs(510)/Rrs(555) and adom(412) showed R2 values of 0.707, 0.707, 0.597 and 0.552, respectively. The spectrum of adom(λ) is shape of exponential function adom(λ) value decreases with increasing wavelength. For estimation of adom(412) from satellite data, we developed an algorithm from the relationship of adom(412) and Rrs(412)/Rrs(555). This algorithm was employed on SeaWiFS imagery to estimate adom(412) in the South Sea, East Sea, Yellow Sea and northern East China Sea areas. Also, SeaDAS-derived adg(412) from same SeaWiFS imagery, These adg(412) was then compared with in-situ and empirical-algorithm-derived adom(412), but these values were different. We think two points that such different values are caused by discrepancy related to failure of standard atmospheric correction scheme, the other are caused by error related to definition of adom(412) and adg(412).