Estimation of Chlorophyll-a Concentration from VIIRS Ocean Color Data in Cambodia
Article Sidebar
Main Article Content
Abstract
A study on chlorophyll-a concentration on Cambodia water in the Gulf of Thailand was conducted using the Visible Infrared Imaging Radiometer Suite (VIIRS) to produce an estimation of global chlorophyll-a concentration. Field data was obtained from R/V Koyo-maru cruise No 49/2514 in 26 stations on November 2014 using calibration and validation. The study yielded results of a mean concentration of 1.467 mg/m3, minimum concentration of 0.503 mg/m3 and maximum concentration of 55.663 mg/m3. The relationship between field data and satellite data is Y = 1.721x + 0.291, where Y is field chlorophyll-a concentration and x is concentration from VIIRS product. The coefficient of determination (R2) is 0.245 which is lower than expected whereas RMSE from validation is 0.275 which is acceptable enough.
Article Details
References
2. Franz, BA, Werdell, PJ., Meister, G., Bailey, S.W., Eplee, R.E.J., Feldman, G.C., Kwiatkowska, E., McClain, C.R., Patt, F.S. and Thomas, D. 2005. The continuity of ocean color measurements from SeaWiFS to MODIS, SPIE Earth observing systems X, 31July -4 August 2005, San Diego U.S.A., accessed from https://oceanoolor.gsfc.nasa.gov/DOCS/Presentations/SPIE_2005_Franz.pdf
3. Gons, H.J., Rijkeboer, M., and Ruddick, K.G. 2002. A chlorophyll-ɑ retrieval algorithm for satellite imagery (Medium Resolution Imaging Spectrometer) of inland and coastal waters. Journal of Plankton Research. 24 (9): 947-951.
4. Lee, Z., Maritorena, S., and Barnard, A. 2006. Simple algorithms for absorption coefficients, Remote saning of inherent optical properties: fundamentals, tests of algorithms, and applications, IOCCG Report Number 5, 2006. Reports of the Intemational Ocean-Colour Coordinating Group. GKSS Research centre, Max. Planck Str., Geesthacht, Germany. pp 27-33.
5. Moses, WJ., Gitelson, A.A., and Povazhnyy, V. 2009. Estimation of chlorophyll-ɑ concentration in case II waters using MODIS and MERIS data-successes and challenges. Environmental research letters.4 (45005): 8 pp.
6. Sauer, M.J., Roesler, C.S., Werdell, P.J., and Barnard, A. 2012. Under the hood of satellite empirical chlorophyll ɑ algorithms: revealing the dependencies of maximum band ratio algorithms on inherent optical properties. Optics express. 20 (19): 20920-20933.