Inversion of Chlorophyll <i>a</i> concentration in Qinhuangdao sea area based on GOCI satellite data

ZHANG Xi-yuan; WAN Jian-hua; LIU Shan-wei; XU Ming-ming

doi:10.12111/j.mes.20200028

Volume 40 Issue 3

Jun. 2021

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Chinese Journal of MARINE ENVIRONMENTAL SCIENCE > 2021 > 40(3): 462-467. > DOI: 10.12111/j.mes.20200028

ZHANG Xi-yuan, WAN Jian-hua, LIU Shan-wei, XU Ming-ming. Inversion of Chlorophyll a concentration in Qinhuangdao sea area based on GOCI satellite data[J]. Chinese Journal of MARINE ENVIRONMENTAL SCIENCE, 2021, 40(3): 462-467. DOI: 10.12111/j.mes.20200028

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Inversion of Chlorophyll a concentration in Qinhuangdao sea area based on GOCI satellite data

College of Oceanography and Space Informatics, China University of Petroleum, Qingdao 266580, China

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Received Date: February 16, 2020
Revised Date: June 26, 2020

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Abstract

Based on the measured data of water bodies collected on april 23^rd, 24^th, June 1^st and July 6^th, 2016 and the GOCI (Geostationary Ocean Color Imager) satellite remote sensing images of the same period, the Chl a concentration in Qinhuangdao sea area is studied. The NDPI (normalized dark pixel index) method is used to analyze the correlation between the radiance and Chl a concentration of eight band combinations of the images. The band combinations with correlation coefficient≥70% are selected as independent variables to construct the Chl a concentration inversion model (R²=0.956). The average relative error of the model is 25.3% verified by independent phase measured data. The Chl a concentration in Qinhuangdao sea area from December 2017 to November 2018 was retrieved by using this model. The results show that the concentration of Chl a in the coastal area of Qinhuangdao is generally higher, the overall concentration in autumn and winter is lower, and the peak concentration appears in summer.
- Chl a concentration,
- inversion model,
- Qinhuangdao waters,
- GOCI

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