Mr. Andra Whiteside Profile

Andra Whiteside

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Proceedings Article | 3 January 2025 Paper

Evaluating the applicability of ocean color algorithms in the Fiji region from in situ bio-optical data

Cécile Dupouy, Jing Tan, Robert Frouin, Andra Whiteside, Awnesh Singh, Martine Rodier, Rüdiger Röttgers, Benjamin Oursel, Hiroshi Murakami, Madeleine Goutx

Proceedings Volume 13264, 132640H (2025) https://doi.org/10.1117/12.3049365

KEYWORDS: Backscatter, In situ metrology, Chlorophyll, Turbidity, Water, Rain, Satellites, Signal attenuation, Remote sensing, Reflectivity

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Tropical islands ‘s oceanic biogeochemical environments may be influenced by continental forcing. The impact of the large Rewa River plume South of the main island of Viti Levu (Fiji) on the microbial processes i.e. carbon and nitrogen fluxes, fisheries richness or coral resources of the Fijian archipelago is unknown. SGLI imagery is helpful in describing ocean color South of Fiji. In order to examine the applicability of ocean colour algorithms for GCOM-C, in situ bio-optical and radiometric data were collected during the March-April 2022 SOKOWASA cruise. Typical mesotrophic waters with ranges of chlorophyll a concentration (Chla, 0.10-0.41 mg·^m−3), MES (0.2 to 1.62 g.^m-3), b_bp550 (5.7 10^-4-0.0037 ^m-1) and a_CDOM440 (0.013- 0.047 ^m-1) are found on a South-North gradient between open ocean and the coast. The remote sensing reflectance obtained using HOCR were inverted to retrieve Inherent Optical Properties (IOPs) for the empirical and semianalytical (QAA, GIOP) algorithms and for OC3 for Chla. All IOPs could be derived from Chla (Case 1 waters). Results showed the capacity and usefulness of the derived products of SGLI (GCOM-C) to monitor the water quality of the Southern ocean South of Fiji. As concluded by bio-optical analysis, during the dry period experienced during SOKOWASA, mesotrophic waters extend far south of the Kadavu Island and small phytoplankton plumes issued from land are mostly formed by organic matter and may feed coral reefs.

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