Evaluation of atmospheric correction algorithms in the extreme absorbing waters of the Laptev Sea

• Main Authors: Soppa, Mariana Altenburg, Hellmann, Sebastian, Hoelemann, Jens, Martynov, Fedor, Heim, Birgit, Steinmetz, F., Dinter, Tilman, Bracher, Astrid
• Format: Conference Object
• Language: unknown
• Published: 2017
• Subjects: laptev; Laptev Sea
• Online Access: https://epic.awi.de/id/eprint/48468/; https://hdl.handle.net/10013/epic.2801b719-b490-485b-ad5d-b3d51ec6bab8

Atmospheric correction (AC) in extreme absorbing waters is challenging. The signal coming out of the water is very low when the concentration of colored dissolved organic matter (CDOM) is high, particularly in the short visible wavelengths. Here, we assess the performance of AC algorithms to estimate chlorophyll-a concentration (CHL) and CDOM absorption at 443 nm (aCDOM443) in the optically-complex waters of the Laptev Sea. The performance of C2RCC, C2X, Polymer, and a modified version of the Polymer algorithm for Arctic waters are evaluated. The algorithms were applied to daily MERIS L1b data and the retrievals were validated against in situ measurements of CHL and aCDOM443 from field campaigns conducted in August/September of 2010 and 2011. Preliminary results of the inter-comparison and evaluation against in situ measurements are presented.