Tracer study of CDOM for nitrogen and phosphorus pollution in the offshore Leizhou Peninsula, China

Shiyun Wei; Dongyang Fu; Difeng Wang; Guo Yu; Yafei Luo; Huabing Xu

Ecological Indicators (Apr 2023)

Tracer study of CDOM for nitrogen and phosphorus pollution in the offshore Leizhou Peninsula, China

Shiyun Wei,
Dongyang Fu,
Difeng Wang,
Guo Yu,
Yafei Luo,
Huabing Xu

Affiliations

Shiyun Wei: College of Electronic and Information Engineering, Guangdong Ocean University, Zhanjiang 524088, China
Dongyang Fu: College of Electronic and Information Engineering, Guangdong Ocean University, Zhanjiang 524088, China; Guangdong Provincial Engineering and Technology Research Center of Marine, Zhanjiang 524088, China; Corresponding authors at: College of Electronic and Information Engineering, Guangdong Ocean University, Zhanjiang 524088, China (D. Fu).
Difeng Wang: State Key Laboratory of Satellite Ocean Environment Dynamics, Second Institute of Oceanography, Ministry of Natural Resources, Hangzhou 310012, China; Corresponding authors at: College of Electronic and Information Engineering, Guangdong Ocean University, Zhanjiang 524088, China (D. Fu).
Guo Yu: College of Electronic and Information Engineering, Guangdong Ocean University, Zhanjiang 524088, China; Guangdong Provincial Engineering and Technology Research Center of Marine, Zhanjiang 524088, China
Yafei Luo: College of Electronic and Information Engineering, Guangdong Ocean University, Zhanjiang 524088, China; Guangdong Provincial Engineering and Technology Research Center of Marine, Zhanjiang 524088, China
Huabing Xu: College of Electronic and Information Engineering, Guangdong Ocean University, Zhanjiang 524088, China; Guangdong Provincial Engineering and Technology Research Center of Marine, Zhanjiang 524088, China

Journal volume & issue: Vol. 148
p. 110019

Abstract

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Colorful dissolved organic matter (CDOM) is an optically important active substance in marine habitats that feature significant biochemical conservatism. Additionally, CDOM is an important tracer and indicator of pollution status in marine water masses. In this study, we use sampling data collected in September 2020 and May 2021 from the marine areas around the Leizhou Peninsula. This information is combined with the Delft 3D numerical simulation analysis to carry out a study on the relationship between the ag (355) in the marine areas and to determine the regional marine pollution levels. The results show that (1) the nearshore areas of the Leizhou Peninsula in spring and autumn are mainly lightly polluted. Compared with the same period in history, the pollution level has significantly decreased, and the ag (355), DIN, and DIP concentrations show a trend of high near the shore and low far from shore. The peak concentrations are mainly in the Zhanjiang Bay, Qiongzhou Strait, Wailuo Port, Liusha Port and Guangxi Tieshan Port. (2) ag (355) can be used as an indicator to characterize the degree of water pollution in the nearshore waters of the Leizhou Peninsula. In spring, the ag (355) interval of [0.115, 0.200] m−1, [0.201, 0.245] m−1 and [0.246, 0.484] m−1 can be considered clean, lightly polluted, and moderately polluted water, respectively. In autumn, the ag (355) interval of [0.180, 0.275] m−1, [0.276, 0.478] m−1, [0.479, 0.642] m−1, [0.643, 0.921] m−1 can be considered clean, lightly polluted, moderately polluted and heavily polluted water, respectively. (3) The response models between the ag (355) and pollutant dispersion trends were constructed in the Zhanjiang Bay and Tieshan Port. The RMSEs of the ag (355) validation points in the models were lower than 0.12 mg/L, and the MAPEs were lower than 30 %, the pollution traceability of CDOM is verified.

Published in Ecological Indicators

ISSN: 1470-160X (Print); 1872-7034 (Online)
Publisher: Elsevier
Country of publisher: United Kingdom
LCC subjects: Science: Biology (General): Ecology
Website: https://www.sciencedirect.com/journal/ecological-indicators

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