基于MODIS的西藏典型湖泊叶绿素a浓度反演  

Inversion of Chlorophyll-a Concentration in Typical Lakes of Tibet Based on MODIS

作　　者：陶星宇 柳锦宝[1] 顿玉多吉 德吉央宗 刘志红[1] 卓玛[2] 肖斌 李玉婷 TAO Xingyu;LIU Jinbao;DONYU Dorjee;DEJI Yangzong;LIU Zhihong;ZHUO Ma;XIAO Bin;LI Yuting(School of Resources and Environment,Chengdu University of Information Technology,Chengdu 610225,China;Climate Center of Tibet Autonomous Region,Lhasa 850000,China;Ankang Meteorological Bureau,Ankang 725099,China)

机构地区：[1]成都信息工程大学资源环境学院,四川成都610225 [2]西藏自治区气候中心,西藏拉萨850000 [3]安康市气象局,陕西安康725099

出　　处：《中国环境监测》2023年第1期231-240,共10页Environmental Monitoring in China

基　　金：西藏自治区气候中心2020年气候小型建设项目;国家自然科学基金(42065008);四川省科技厅重点研发项目(2021YFS0328);四川省科技厅重点研发项目(2020YFG0146);第二次青藏高原综合科学考察项目(2019QZKK0304);中国气象科技研究院科技合作项目(2019QZKK0105);四川省自然资源科研项目[Kj-2022-(18)]。

摘　　要：叶绿素a浓度是反映湖泊富营养化状态的一个重要参数。以MODIS L1B数据为基础,结合叶绿素a浓度实测数据,基于经验分析法实现了西藏典型湖泊叶绿素a浓度反演研究,并探索了西藏典型湖泊2019年春、夏、秋季叶绿素a浓度的时空变化特征。首先,利用叶绿素a浓度实测数据和MODIS L1B影像不同波段的反射率值进行组合试验,选择最佳波段组合建立模型;其次,分别选用2015年、2017年叶绿素a浓度实测值和反演值对模型进行对比验证;最后,利用叶绿素a浓度反演模型对西藏典型湖泊2019年春、夏、秋季叶绿素a浓度的时空变化特征进行分析。结果表明:在空间尺度上,西藏典型湖泊叶绿素a浓度整体上呈现出周围高、中部低的分布特征,且湖岸水体叶绿素a浓度变化较大;在季节尺度上,不同湖泊叶绿素a浓度的季节变化存在较大差异,格仁错和色林错的季节变化幅度较大,纳木错、塔若错和羊卓雍错的季节变化幅度较小。Chlorophyll-a concentration is an important parameter reflecting eutrophication state of lake.Based on MODIS L1B data and measured data of chlorophyll-a concentration,this paper realized remote sensing inversion of chlorophyll-a concentration in eight typical lakes in Tibet,and explored the spatio-temporal variation characteristics of chlorophyll-a concentration in spring,summer and autumn of 2019.Firstly,the combined experiment was carried out using the measured data of chlorophyll-a concentration and the reflectance values of different bands of the corresponding MODIS L1B image,and the best band combination was selected to establish the inversion model.Secondly,the measured and inverse values of chlorophyll-a concentration in 2015 and 2017 were selected to compare and verify the models.Finally,based on the inversion model of chlorophyll-a concentration,the spatio-temporal variation characteristics of chlorophyll-a concentration in spring,summer and autumn of 2019 in eight typical lakes in Tibet were analyzed.The results showed that at the spatial scale,the concentration of chlorophyll-a in lakeshore water showed a trend of“high in the periphery,low in the middle”.At the seasonal scale,the seasonal variation of chlorophyll-a concentration in different lakes showed great difference,with the greater variation in Gerentso and Selintso,and the smaller variation in Namtso,Taruoco and Yamdroyongtso.

关 键 词：叶绿素A MODIS 遥感反演 西藏 高原湖泊 

分 类 号：X87[环境科学与工程—环境工程]