Ms. Yan Xue Profile

Yan Xue

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Proceedings Article | 15 November 2023 Paper

CNN-based inversion of chlorophyll-a in the Bohai Sea with spatio-temporal variation characterization of driving forces

Zhaoyang Li, Yan Xue

Proceedings Volume 12815, 128150W (2023) https://doi.org/10.1117/12.3010248

KEYWORDS: Fluorescence, Water, Remote sensing, Ocean optics, Machine learning, Data modeling, Reflectivity, Neural networks, Convolutional neural networks

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With the strategy of Marine potestatem gradually promoting, satellite remote sensing technology has been widely used in chlorophyll-a concentration inversion and evaluation because of its advantages of large range and long time series. In this paper, using the data of GOCI with high temporal and spatial resolution and taking the fluorescence line height (FLH) as a sensitive factor, the chlorophyll-a concentration in Bohai Sea is inversed by CNN convolutional neural network, analyzing its temporal and spatial distribution characteristics and influencing factors. The results show that the spatial distribution of chlorophyll-a decreases from the nearshore to the interior of Bohai Sea, presenting annular distribution. The standard deviation of the overall change of chlorophyll-a concentration is less than 0.4mg/m3 during the five years from 2016 to 2020. However, the daily variation is large. In addition to the positive correlation between chlorophyll-a concentration and total suspended sediments concentration, sea surface temperature, tidal level, pollution discharge and ocean vortex are also factors that cannot be ignored.

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