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Proceedings Paper

Assessment of satellite retrieval algorithms for chlorophyll-a concentration under high solar zenith angle
Author(s): Hao Li; Xianqiang He; Yan Bai; Xiaoyan Chen; Fang Gong; Qiankun Zhu; Zifeng Hu
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Paper Abstract

Numerous empirical algorithms have been operationally used to retrieve the global ocean chlorophyll-a concentration (Chla) from ocean color satellite data, e.g., the OC4V4 algorithm for SeaWiFS and OC3M for MODIS. However, the algorithms have been established and validated based on the in situ data mainly measured under low to moderate solar zenith angle (<70°). Currently, with the development of the geostationary satellite ocean color remote sensing which observes from early morning to later afternoon, it is necessary to know whether the empirical Chla algorithms could be applied to high solar zenith angle. In this study, the performances of seven widely-used Chla algorithms under high solar zenith angles, i.e., OC2, OC3M, OC3V, OC4V4, CLARK, OCI, and YOC algorithms, were evaluated using the NOMAD global in situ ocean color dataset. The results showed that the performances of all the seven algorithms decreased significantly under high solar zenith angles as compared to those under low-moderate solar zenith angles. For instance, for the OC4V4 algorithm, the relative percent difference (RPD) and root-mean-square error (RMSE) were 13.78% and 1.66 μg/l for the whole dataset, and 3.95% and 1.49 μg/l for the solar zenith angles ranged from 30° to 40°, respectively. However, the RPD and RMSE increased to 30.45% and 6.10μg/l for solar zenith angle larger than 70°.

Paper Details

Date Published: 19 October 2016
PDF: 12 pages
Proc. SPIE 9999, Remote Sensing of the Ocean, Sea Ice, Coastal Waters, and Large Water Regions 2016, 99990U (19 October 2016); doi: 10.1117/12.2240164
Show Author Affiliations
Hao Li, The Second Institute of Oceanography, SOA (China)
Xianqiang He, The Second Institute of Oceanography, SOA (China)
Yan Bai, The Second Institute of Oceanography, SOA (China)
Xiaoyan Chen, The Second Institute of Oceanography, SOA (China)
Fang Gong, The Second Institute of Oceanography, SOA (China)
Qiankun Zhu, The Second Institute of Oceanography, SOA (China)
Zifeng Hu, The Second Institute of Oceanography, SOA (China)


Published in SPIE Proceedings Vol. 9999:
Remote Sensing of the Ocean, Sea Ice, Coastal Waters, and Large Water Regions 2016
Charles R. Bostater; Stelios P. Mertikas; Xavier Neyt; Caroline Nichol; Oscar Aldred, Editor(s)

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