Graphical abstract：Geosynchronous satellite GF-4 can effectively detect short-term change (changes within ten minutes) in Chla concentration. The changes mainly appear at the southwest and northeast costal area as well as in the center of Bohai Sea. a1-c1, a2-c2: Chla concentration distribution at different times of the day. a3-c3: Changes in Chla concentration at two different times of the day. Colored squares: Chla change areas.

　　研究发现: 1) GF-4 PMS传感器叶绿素反演模型PMS-1可以很好地提取渤海地区叶绿素浓度分布细节。渤海的叶绿素高含量区域主要位于沿海地区，如莱州湾南岸,渤海湾和辽东湾。叶绿素的浓度在黄海北部渤海海峡相对较低。2) 充分利用地球静止轨道卫星的连续观测以及50米高分辨率传感器优势，可以有效监测叶绿素浓度的短期变化(10分钟内的浓度变化)。该变化主要出现在西南、东北沿海地区以及渤海中心地区。3) 叶绿素浓度的这种短期变化(10分钟内的变化)主要是由海流和风引起的。因此，利用GF-4与地球同步观测的优势可以对海洋环境因子进行更为精细的监测。

　　该项研究获得广东省海洋遥感重点实验室LORS(2017B030301005)开放基金和广东省重大人才工程项目U团队（2019BT2H594）等资助。

　　论文第一作者：蔡丽娜博士

　　近期相关研究论文还有：

　　1. Cai, L.N, Juan Bu, Danling Tang, Minrui Zhou, Ru Yao, and Shuyi Huang, 2020. Geosynchronous Satellite GF-4 Observations of Chlorophyll-a Distribution Details in the Bohai Sea, China. Sensors. 2020, 20, 5471; doi:10.3390/s20195471

　　2. Cai, L.N, Minrui Zhou, Jianqiang Liu, Danling Tang, Juncheng Zuo. 2020, HY-1C observations of the impacts of islands on suspended sediment distribution in Zhoushan Coastal waters, China. Remote Sensing. 2020, 12, 1766; doi:10.3390/rs12111766

　　3. Cai, L.N, LiLi Xu, DanLing Tang, WeiZeng Shao, JunCheng Zuo, QiYan Ji. 2020, The effects of ocean temperature gradients on bigeye tuna (Thunnus obesus) distribution in the equatorial eastern Pacific Ocean. Advances in Space Research.https://doi.org/10.1016/j.asr.2020.03.030

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