基于BRDF校正的上海近海水体叶绿素a浓度反演  

Inversion of Chlorophyll-a Concentration in Shanghai Offshore Waters Based on BRDF Correction

作　　者：韩震[1,2] 陈帅康 李丕学 陈浩程 HAN Zhen;CHEN Shuai-kang;LI Pi-xue;CHEN Hao-cheng(School of Marine Science,Shanghai Ocean University,Shanghai 201306,China;Shanghai Estuarine Marine Mapping Engineering Technology Research Center,Shanghai 201306,China;Shanghai Marine Environment Monitoring and Forecasting Center,Shanghai 200062,China)

机构地区：[1]上海海洋大学海洋科学学院,上海201306 [2]上海河口海洋测绘工程技术研究中心,上海201306 [3]上海市海洋环境监测预报中心,上海200062

出　　处：《长江科学院院报》2024年第9期169-177,共9页Journal of Changjiang River Scientific Research Institute

基　　金：上海市海洋局科研专项(沪海科2019-03);教育部产学合作协同育人项目(202102245031)。

摘　　要：为了探究上海近海区水体生态状况,采用水色遥感技术,对叶绿素a浓度进行反演,考虑BRDF对反演的影响,基于Landsat-8遥感数据和水质实测数据,结合Lee模型和QAA算法对上海近海水体进行BRDF校正。结果表明:悬浮泥沙浓度是影响水体BRDF的主要原因之一;日光在非垂直入射时,角度对水体BRDF影响较小;BRDF校正后模型R2平均值达到0.9,提高了22.2%,RMSE平均值降低至0.74;BRDF校正前上海近海区叶绿素a浓度平均被高估2 mg/m^(3)。通过BRDF校正提高了叶绿素a反演精度,为近海水体水色反演研究提供新思路。To investigate the ecological status of Shanghai’s offshore waters,we applied the water color remote sensing technology to estimate chlorophyll-a concentration.Considering the impact of BRDF(Bidirectional Reflectance Distribution Function)on inversion accuracy,we utilized LandSat-8 remote sensing data and measured water quality data in association with Lee’s model and QAA(Quasi-analytical algorithm)for BRDF correction.Results indicate that suspended sediment concentration is a major factor affecting BRDF.The angle of sunlight has minimal impact on BRDF when the sun is not vertically incident.After BRDF correction,the mean value of R 2 increased by 22.2%to 0.9,whereas mean RMSE decreased to 0.74.Before the correction,chlorophyll-a concentrations in Shanghai’s offshore waters were overestimated by an average of 2 mg/m^(3).BRDF correction notably enhances chlorophyll-a inversion accuracy,presenting innovative insights for offshore water color inversion.

关 键 词：叶绿素A BRDF校正 近海水体 Landsat-8 

分 类 号：X87[环境科学与工程—环境工程]