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湖泊科学  2011 

基于MERIS数据的滇池叶绿素浓度时空变化(2003-2009年)及趋势

DOI: 10.18307/2011.0414

Keywords: 叶绿素a,时空变化,滇池,MERIS数据,三波段模型

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Abstract:

基于多时相MERIS数据,本文对滇池叶绿素a浓度的时空变化趋势进行了研究.以野外实测数据为基础,对应用较好的三种叶绿素a浓度反演模型进行了验证比较,通过精度评价和误差分析选择最优的三波段模型;将其应用到经过几何纠正和大气纠正等预处理后的MERIS数据系列,得到2003-2009年时间序列下的57幅滇池叶绿素a浓度分布图.分析结果表明,在2003-2009年间,滇池叶绿素a浓度总体呈周期性波动缓慢上升趋势,每年2-3月浓度最低,4-11月较快上升达到峰值,12-1月开始回落;空间分布上,叶绿素a浓度高值区多出现在滇池北部、岸边带等靠近城镇的人口聚集区域,且浓度越高的季节,空间分布差异越显著。

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