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Remote Sensing Analysis of the Distribution Characteristics of CDOM and COD in Northern Chu Island Waters off Weihai, Shandong Province
Author(s): 
Pages: 63-70
Year: Issue:  2
Journal: Ocean Technology

Keyword:  northern Chu Island waterschromophoric dissolved organic matter(CDOM)chemical oxygen demand(COD Mn )remote sensing analysis;
Abstract: According to the chemical oxygen demand(CODMn) values and the apparent optical properties measured in July and September 2017 located in northern Chu Island off Weihai, Shandong Province, combined with CDOM product provided by the sensors GOCI(Geostationary Ocean Color Imager) mounted on the COMS(Communication, Ocean & Meteorological Satellite). Also based on Star synchronize data to verify the current model of inverse CDOM on account of remote sensing reflectance, it is capale of making determination of the suitable inversion model of CDOM concentration. Through the correlation analysis between the CODMn content in testing area and CDOM concentration of water bodies retrieved by remote sensing, this paper establishes the CODMn remote sensing inversion model based on CDOM value. The model is applied to the remote sensing images of the sea area under test and get the sea area CODMn concentration map. Based on these thematic maps, the spatiotemporal distribution of CODMn in the test sea area is analyzed. The results show that:(1) with time and site dynamic changes, GOCI-based CDOM product values closer to the offshore are higher, and in the same place,the fluctuation of CDOM in one hour is also larger.(2) the time of CODMn concentration based on LANDSAT 8/OLI(Operational Land Imager)remote sensing data is dynamically changing. Overall, the CODMn content of the water near Chu Island is relatively low and the northern part witnesses higher CODMn content. The CODMn content of the water body on the west side of Chu Island is higher than that of the water body on the east side.
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