A test of empirical and semi-analytical algorithms for euphotic zone depth with SeaWiFs data off southeastern China

Jingjing Chen; Shaoling Shang; Junwu Tang; Zhongping Lee; Huasheng Hong; Minhan Dai; Weidong Zhai

doi:10.1117/12.758672

5 October 2007 A test of empirical and semi-analytical algorithms for euphotic zone depth with SeaWiFs data off southeastern China

Jingjing Chen, Shaoling Shang, Junwu Tang, Zhongping Lee, Huasheng Hong, Minhan Dai, Weidong Zhai

Author Affiliations +

Proceedings Volume 6680, Coastal Ocean Remote Sensing; 668017 (2007) https://doi.org/10.1117/12.758672
Event: Optical Engineering + Applications, 2007, San Diego, California, United States

Abstract

This study employs SeaWiFS data over the waters off the southeastern China to evaluate a semi-analytical algorithm for euphotic zone depth (Z_e). This algorithm is based on water's inherent optical properties (IOPs), which can be near-analytically calculated from spectral remote-sensing reflectance, where remote-sensing reflectance can be derived from the normalized water-leaving radiance provided by SeaWiFS. In the Taiwan Strait, compared with in situ Z_e (±3 hour within SeaWiFS collection), average error (ε) is 15.0 % and root mean square error (RMSE) is 0.074, with Z_e in a range of 14-34 m from field measurements. In the South China Sea, compared with in situ Z_e (±48 hour within SeaWiFS collection),ε is 5.1 % in summer and 22.6 in winter, while RMSE is 0.032 in summer and 0.129 in winter, with Z_e in a range of 10-82 m from field measurements. For comparison, we also evaluate the performance of the empirical Z_e algorithm that is based on chlorophyll concentration. It is found that the IOP-centered approach has higher accuracy compared to the chlorophyll-a centered approach (e.g. in the South China Sea in winter, ε is 55.3 % and RMSE is 0.219). The new algorithm is thus found not only worked well with waters of the Gulf of Mexico, Monterey Bay and the Arabian Sea, but also worked well with waters of the China Sea.

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Jingjing Chen, Shaoling Shang, Junwu Tang, Zhongping Lee, Huasheng Hong, Minhan Dai, and Weidong Zhai "A test of empirical and semi-analytical algorithms for euphotic zone depth with SeaWiFs data off southeastern China", Proc. SPIE 6680, Coastal Ocean Remote Sensing, 668017 (5 October 2007); https://doi.org/10.1117/12.758672

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