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Proceedings Paper

Monitoring Secchi depth of the Yellow Sea and the East China Sea using a semi-analytical algorithm
Author(s): Dingfeng Yu; Bin Zhou; Qianguo Xing; Yanguo Fan; Tantan Li; Xiaoling Sun
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Paper Abstract

Secchi depth, an important optical characteristic of water, is a useful index of water quality and is widely used in many environmental studies. The Yellow Sea and the East China Sea are typical case 2 waters, where concentrations of suspended matter, phytoplankton pigments, and colored dissolved organic matter are higher than those in other open oceans. Two cruises were conducted to investigate the water optical characteristics in the Yellow Sea and the East China Sea in May and June, 2009. 62 water sampling stations of Secchi disk depth were measured in situ in day time, and their values were in the range of 0.0112 to 15.6 m with the mean of 6.72 m and a standard deviation of 3.18 m. In this paper, we adapted a quasi-analytical algorithm to estimate the Secchi depth from satellite ocean data in both coastal and oceanic waters. The development of the algorithm is based on the use of in situ measurements and 8-day MODIS-Aqua remote sensing reflectance data with 4 km spatial resolution. More than 39 matchups were compiled for the MODIS sensor by spatial-temporal matching. The comparison between water transparency retrievals from remote sensing data and in situ measurements yields showed that the determination coefficient was 0.60 and a root mean square error of 8.4 m. This study suggests that the quasi-analytical algorithm provide a promising result on in situ data. In the future, maps of ocean transparency for this area will be derived using this algorithm.

Paper Details

Date Published: 18 December 2014
PDF: 7 pages
Proc. SPIE 9261, Ocean Remote Sensing and Monitoring from Space, 92611J (18 December 2014); doi: 10.1117/12.2068166
Show Author Affiliations
Dingfeng Yu, Institute of Oceanographic Instrumentation (China)
Shandong Provincial Key Lab. of Marine Environment Monitoring Technology (China)
Bin Zhou, Institute of Oceanographic Instrumentation (China)
Shandong Provincial Key Lab. of Marine Environment Monitoring Technology (China)
Qianguo Xing, Yantai Institute of Coastal Zone Research (China)
Yanguo Fan, East China Univ. of Petroleum (China)
Tantan Li, East China Univ. of Petroleum (China)
Xiaoling Sun, Institute of Oceanographic Instrumentation (China)


Published in SPIE Proceedings Vol. 9261:
Ocean Remote Sensing and Monitoring from Space
Robert J. Frouin; Delu Pan; Hiroshi Murakami, Editor(s)

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