2002-2021年渤海叶绿素a浓度变化及环境响应分析  

Change of Chlorophyll a Concentration and Its Environmental Response in the Bohai Sea from 2002 to 2021

作　　者：孟庆辉[1] 王林[1] 陈艳拢[1] 王祥[1] 王新新[1] MENG Qinghui;WANG Lin;CHEN Yanlong;WANG Xiang;WANG Xinxin(National Marine Environmental Monitoring Center,Dalian 116023,China)

机构地区：[1]生态环境部国家海洋环境监测中心,辽宁大连116023

出　　处：《中国环境监测》2022年第6期228-236,共9页Environmental Monitoring in China

基　　金：国家重点研发计划项目(2019YFC1407904,2018YFC1407605);大连市高层次人才创新支持计划项目(2021RQ073)。

摘　　要：基于2013—2021年渤海遥感反射率和叶绿素a浓度等实测数据,开展了该海域MODIS影像的叶绿素a浓度遥感反演模型研究。选择OC3经典模型形式,采用渤海的实测数据进行拟合分析,获取了适用于渤海的模型局地化参数,通过真实性检验得到叶绿素a浓度的遥感反演结果与实测值的决定系数为0.84,平均相对误差为24.77%,均方根误差为5.56μg/L,反演精度较佳。利用该算法反演获取了渤海2002—2021年叶绿素a的月度、季度和年度平均浓度,分析了其时空变化特征,同时结合2001—2021年渤海非优良水质比例开展了环境响应分析。分析结果显示:2001—2021年,渤海非优良水质比例与同时期叶绿素a浓度变化趋势基本一致,呈现先变差后变好的倒V形趋势;5年平均的非优良水质比例与叶绿素a浓度变化趋势更直观地反映了2001—2021年渤海整体的水环境变化趋势,与非优良水质比例相比,叶绿素a浓度对渤海水环境的改善响应更快。In this paper,the chlorophyll a retrieval algorithm for the MODIS was developed based on the in-situ chlorophyll-a concentration and remote sensing reflectance spectra in the Bohai Sea from 2013 to 2021.Through the classical OC3 model,the in-situ data were used to fit and analysis to obtain the local parameters of the model suitable for Bohai Sea.The R 2,MAPE and RMSE of the remote sensing inversion results were 0.84,24.77%and 5.56μg/L,respectively,with good inversion accuracy.Using this algorithm,the monthly,seasonal and annual average chlorophyll a concentration in the Bohai Sea from 2002 to 2021 were retrieved,and the temporal and spatial variation characteristics were analyzed.Meanwhile,the environmental response was analyzed based on the proportion of the sea area with water quality not meeting GradeⅡin the Bohai Sea from the beginning of this century.The results showed that from 2001 to 2021,the proportion of the sea area with water quality not meeting GradeⅡin the Bohai Sea had the same trend with chlorophyll a concentration in the same period,showing an inverted“V”shape trend of first getting worse and then getting better.The average ratio of the proportion of the sea area with water quality not meeting GradeⅡand chlorophyll a concentration in 5 years reflected the overall trend of water environment change in the Bohai Sea from 2001 to 2021,and chlorophyll a concentration had a faster response to the improvement of the Bohai Sea water environment.

关 键 词：叶绿素A 遥感反演 时空变化 MODIS影像 渤海 

分 类 号：X87[环境科学与工程—环境工程]