基于“哨兵-3A”OLCI影像的太湖蓝藻水华荧光基线高度指数信号特征分析  

The Sentinel-3A OLCI Fluorescence Line Height(FLH) Signal Pattern of Cyanobacteria Blooms in Taihu Lake

作　　者：李旭文[1] 侍昊[1] 王甜甜[1] 姜晟[1] 张悦[1] 蔡琨[1] 丁铭[1] LI Xu-wen;SHI Hao;WANG Tian-tian;JIANG Sheng;ZHANG Yue;CAI Kun;DING Ming(Jiangsu Provincial Environmental Monitoring Center, Nanjing, Jiangsu 210036, China)

机构地区：[1]江苏省环境监测中心,江苏南京210036

出　　处：《环境监控与预警》2018年第3期9-13,39,共6页Environmental Monitoring and Forewarning

基　　金：太湖流域水生态监测与评价应用示范基金资助项目(2013ZX07502001-005);国家水体污染控制与治理科技重大专项基金资助项目(2017ZX07302-003);国家水体污染控制与治理科技重大专项基金资助项目(城市黑臭水体遥感监管关键技术先期研究)

摘　　要：利用新型遥感数据"哨兵-3A"卫星OLCI影像数据,基于其665,681和708 nm波段构建的"荧光基线高度"指数算法,采用SNAP 6.0遥感专业软件,计算了2017年不同季节4个典型日期太湖FLH的全湖分布及蓝藻水华区信号强度特征。以完成了瑞利散射及气体吸收订正的3个波段的遥感反射率数据计算FLH图像,结果表明,FLH数值的"负偏"程度与蓝藻水华强度有很好的对应关系,FLH值"负偏"越大,蓝藻水华越严重,可以作为比较不同季节水华强度的有效遥感指标;富营养化较严重、较为浑浊、以蓝藻为优势种的内陆水体与大洋清洁、非蓝藻优势浮游植物水体的FLH"正偏"信号特征迥异。The distribution of Fluorescence Line Height（ FLH） and the signal intensity characteristics of cyanobacteria blooms area in Taihu Lake in 4 typical dates in different seasons of 2017 were calculated by the professional remote sensing software SNAP 6. 0 with the new Sentinel-3 A OLCI remote sensing image data and the index algorithm of Fluorescence Line Height which was built based on the band of 665,681 and 708 nm. FLH images were computed by remote sensing reflectance data of 3 bands which was corrected by Rayleigh scattering and gas absorption. The results show the negative shift of FLH has consistent coincidence with the severity of Cyanobacteria blooms,the more negative FLH is,the severely the bloom bursts. FLH can be used as an index of Cyanobacteria bloom intensity to compare blooms in different seasons. It also reveals the negative FLH signal feature for eutrophic,turbid,Cyanobacteria dominant inland waters is distinct from the positive FLH signal feature for clean,non-Cyanobacteria phytoplankton ocean waters.

关 键 词：哨兵-3A 海洋和陆地彩色成像仪 荧光基线高度 SNAP软件 蓝藻水华 太湖 

分 类 号：X87[环境科学与工程—环境工程]