Remote sensing retrieval and hourly variation analysis of total absorption coefficient in the Bohai Sea with geostationary ocean color imager

被引：0
|
作者：
Mu B. [1 ]
Cui T. [2 ]
Qin P. [1 ]
Liu R. [2 ]
Zheng R. [1 ]
机构：
[1] College of Information Science and Engineering, Ocean University of China, Qingdao, 266100, Shandong
[2] The First Institute of Oceanography, State Oceanic Administration, Qingdao, 266061, Shandong
来源：
Guangxue Xuebao/Acta Optica Sinica | 2016年 / 36卷 / 04期
关键词：
Geostationary ocean color imager; Oceanic optics; Remote sensing retrieval; Total absorption coefficient;
D O I：
10.3788/AOS201636.0401003
中图分类号：
学科分类号：
摘要：
The optical properties of the semi-closed Bohai Sea are complex due to significant terrigenous influence. The high temporal resolution data from geostationary ocean color imager (GOCI) makes it possible to explore the temporal and spatial variability characteristics in the Bohai Sea, especially on the hourly temporal scale. A remote sensing algorithm is developed to retrieve the total absorption coefficients at 412, 443, 555 nm in the Bohai Sea based on the GOCI band ratio of remote sensing reflectance. The algorithm is validated with independent field data. The correlation coefficient between the retrieved and measured data is higher than 0.8, the average absolute percentage difference (APD) is less than 13%, and the median absolute percentage difference is less than 9%. The performance is better than that of previous typical algorithms (improvement over 10%). Based on the independent field-satellite match-up data, the APD between the retrieved and measured data is less than 35%. On the basis of the GOCI image (May 4th, 2015) and the new model, the spatial and hourly variation characteristics in the Bohai Sea are discussed. The results show that diurnal variability magnitude is mainly 0.2~0.3 m-1, and the maximum can reach 0.8 m-1. High diurnal variability values are found mainly in the Liaodong Bay, the Bohai Bay and the Laizhou Bay. The total absorption coefficient is analyzed together with tide data, and the variations are generally consistent with the corresponding tidal height variations in the Liaodong Bay and the north of the Bohai Bay, though the minimal total absorption coefficient appears about 0~1.5 h later than the lowest tide moment. The total absorption coefficient shows significant negative correlation with tide height in the west of the Laizhou Bay. The total absorption coefficient and tidal height have no obvious correlation in the south of the Bohai Bay and the east of the Laizhou Bay. © 2016, Chinese Lasers Press. All right reserved.
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页数：9
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