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http://dx.doi.org/10.5467/JKESS.2022.43.5.591

Sea Water Type Classification Around the Ieodo Ocean Research Station Based On Satellite Optical Spectrum  

Lee, Ji-Hyun (Department of Science Education, Seoul National University)
Park, Kyung-Ae (Department of Earth Science Education, Seoul National University)
Park, Jae-Jin (Department of Earth Science Education, Seoul National University)
Lee, Ki-Tack (Division of Environmental Science and Engineering, Pohang University of Science and Technology)
Byun, Do-Seung (Ocean Research Division, Korea Hydrographic and Oceanographic Administration)
Jeong, Kwang-Yeong (Ocean Research Division, Korea Hydrographic and Oceanographic Administration)
Oh, Hyun-Ju (Ocean Research Division, Korea Hydrographic and Oceanographic Administration)
Publication Information
Journal of the Korean earth science society / v.43, no.5, 2022 , pp. 591-603 More about this Journal
Abstract
The color and optical properties of seawater are determined by the interaction between dissolved organic and inorganic substances and plankton contained in it. The Ieodo - Ocean Research Institute (I-ORS), located in the East China Sea, is affected by the low salinity of the Yangtze River in the west and the Tsushima Warm Current in the south. Thus, it is a suitable site for analyzing the fluctuations in circulation and optical properties around the Korean Peninsula. In this study, seawater surrounding the I-ORS was classified according to its optical characteristics using the satellite remote reflectance observed with Moderate Resolution Imaging Spectroradiometer (MODIS)/Aqua and National Aeronautics and Space Administration (NASA) bio-Optical Marine Algorithm Dataset (NOMAD) from January 2016 to December 2020. Additionally, the variation characteristics of optical water types (OWTs) from different seasons were presented. A total of 59,532 satellite match-up data (d ≤ 10 km) collected from seawater surrounding the I-ORS were classified into 23 types using the spectral angle mapper. The OWTs appearing in relatively clear waters surrounding the I-ORS were observed to be greater than 50% of the total. The maximum OWTs frequency in summer and winter was opposite according to season. In particular, the OWTs corresponding to optically clear seawater were primarily present in the summer. However, the same OWTs were lower than overall 1% rate in winter. Considering the OWTs fluctuations in the East China Sea, the I-ORS is inferred to be located in the transition zone of seawater. This study contributes in understanding the optical characteristics of seawater and improving the accuracy of satellite ocean color variables.
Keywords
MODIS/Aqua; Ieodo - Ocean Research Station; optical water type; ocean color;
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