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Proceedings Paper

A test of empirical and semi-analytical algorithms for euphotic zone depth with SeaWiFs data off southeastern China
Author(s): Jingjing Chen; Shaoling Shang; Junwu Tang; Zhongping Lee; Huasheng Hong; Minhan Dai; Weidong Zhai
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Paper Abstract

This study employs SeaWiFS data over the waters off the southeastern China to evaluate a semi-analytical algorithm for euphotic zone depth (Ze). 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 Ze (±3 hour within SeaWiFS collection), average error (ε) is 15.0 % and root mean square error (RMSE) is 0.074, with Ze in a range of 14-34 m from field measurements. In the South China Sea, compared with in situ Ze (±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 Ze in a range of 10-82 m from field measurements. For comparison, we also evaluate the performance of the empirical Ze 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.

Paper Details

Date Published: 5 October 2007
PDF: 10 pages
Proc. SPIE 6680, Coastal Ocean Remote Sensing, 668017 (5 October 2007); doi: 10.1117/12.758672
Show Author Affiliations
Jingjing Chen, Xiamen Univ. (China)
Shaoling Shang, Xiamen Univ. (China)
Junwu Tang, State Oceanic Administration (China)
Zhongping Lee, Naval Research Lab. (United States)
Huasheng Hong, Xiamen Univ. (China)
Minhan Dai, Xiamen Univ. (China)
Weidong Zhai, Xiamen Univ. (China)


Published in SPIE Proceedings Vol. 6680:
Coastal Ocean Remote Sensing
Robert J. Frouin; ZhongPing Lee, Editor(s)

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