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Colored Dissolved Organic Matter (CDOM) is one of the important components of optical properties of seawater to determine ecosystem dynamics in a given marine area. The optical characteristics of CDOM may depend on the various ecosystem and environmental variables in the sea and those variables may vary region to region. Therefore, the retrieval algorithm for determining light absorption coefficient of CDOM (aCDOM) using satellite remote sensing reflectance (Rrs) developed from other region may not be directly applicable to the other region, and it must be validated using an in-situ ground-truth observation. We have tested 6 known CDOM algorithms (three Semi-analytical and three Empirical CDOM algorithms) developed from other regions of the world ocean with laboratory determined in-situ values for the East Sea using field data collected during seven oceanographic cruises in the period of 2009~2011. Our field measurements extended from the coastal waters to the open oceanic type CASE-1 Waters. Our study showed that Quasi-Analytical Algorithm (QAA_v5) derived aCDOM(412) appears to match in-situ aCDOM(412) values statistically. Semi-analytical algorithms appeared to underestimate and empirical ones overestimated aCDOM in the East Sea. aCDOM(412) value was found to be relatively high in the relatively high satellite derived-chlorophyll-a area. aCDOM(412) value appears to be influenced by the amount of chlorophyll-a in seawater. The outcome of this work may be referenced to develop aCDOM algorithm for the new Korean Geostationary Ocean Color Imager (GOCI).

Verification of CDOM Algorithms Based on Ocean Color Remote Sensing Data in the East Sea