A test of empirical and semi-analytical algorithms for euphotic zone depth with SeaWifs data off southeastern China - art no 668017
- 海洋环境－会议论文 
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 Z(e) (+/- 3 hour within SeaWiFS collection), average error (c) is 15.0 % and root mean square error (RMSE) is 0.074, with Ze in a range of 14-34 in from field measurements. In the South China Sea, compared with in situ Ze ( 48 hour within SeaWiFS collection),epsilon 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 in 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, epsilon 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.