Satellite-observed significant improvement in nearshore transparency of the Bohai Sea during pollution control

作     者：Xuyan Li Jinzhao Xiang Liudi Zhu Zhibin Yang Ting Wei Bing Mu Xiaobo Zhang Tingwei Cui Xuyan Li;Jinzhao Xiang;Liudi Zhu;Zhibin Yang;Ting Wei;Bing Mu;Xiaobo Zhang;Tingwei Cui

作者机构：School of Atmospheric SciencesSun Yat-Sen University/Key Laboratory of Tropical Atmosphere-Ocean SystemMinistry of Education/Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai)Zhuhai 519082China Faculty of Information Science and EngineeringOcean University of ChinaQingdao 266071China 

出 版 物：《Acta Oceanologica Sinica》 (海洋学报（英文版）)

年 卷 期：2023年第42卷第12期

页      面：51-62页

核心收录：

学科分类：083002[工学-环境工程] 0830[工学-环境科学与工程（可授工学、理学、农学学位）] 07[理学] 0707[理学-海洋科学] 08[工学] 09[农学] 0903[农学-农业资源与环境] 0713[理学-生态学] 

基　　金：The fund supported by Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai) under contract No. SML2021SP313 the fundamental research funds for the Central Universities of Sun Yat-Sen University under contract No.23xkjc019 the fund supported by China-Korea Joint Ocean Research Center of China under contract No. PI-2022-1-01 

主　　题：Secchi disk depth transparency water quality nearshore Bohai Sea satellite ocean color remote sensing pollution control 

摘      要：The Bohai Sea(BS)is the unique semi-closed inland sea of China,characterized by degraded water quality due to significant terrestrial pollution *** order to improve its water quality,a dedicated action named“Uphill Battles for Integrated Bohai Sea Management(UBIBSM,2018–2020)was implemented by the Chinese *** evaluate the action effectiveness toward water quality improvement,variability of the satelliteobserved water transparency(Secchi disk depth,Z_(SD))was explored,with special emphasis on the nearshore waters(within 20 km from the coastline)prone to terrestrial influence.(1)Compared to the status before the action began(2011–2017),majority(87.3%)of the nearshore waters turned clear during the action implementation period(2018–2020),characterized by the elevated Z_(SD)by 11.6%±12.1%.(2)Nevertheless,the improvement was not spatially uniform,with higher Z_(SD)improvement in provinces of Hebei,Liaoning,and Shandong(13.2%±16.5%,13.2%±11.6%,10.8%±10.2%,respectively)followed by Tianjin(6.2%±4.7%).(3)Bayesian trend analysis found the abrupt Z_(SD)improvement in April 2018,which coincided with the initiation of UBIBSM,implying the water quality response to pollution *** importantly,the independent statistics of land-based pollutant discharge also indicated that the significant reduction of terrestrial pollutant input during the UBIBSM action was the main driver of observed Z_(SD)improvement.(4)Compared with previous pollution control actions in the BS,UBIBSM was found to be the most successful one during the past 20 years,in terms of transparency improvement over nearshore *** presented results proved the UBIBSM-achieved remarkable water quality improvement,taking the advantage of long-term consistent and objective data record from satellite ocean color observation.