秋季太湖叶绿素a浓度荧光反演研究

基于2007年11~12月太湖全湖实测水质参数和光谱数据,首先利用高斯方程对遥感反射率进行过滤分解,找出叶绿素a(chl\|a)吸收峰675 nm以后的荧光反射峰(Fluorescence Peak:FP),再以662 nm处的反射率为基准,采用归一化荧光高度法进行叶绿素a浓度(C chl-a)反演,得到chl-a反演模型。基于高斯分解获取的chl-a的荧光反射峰值R(FP)与662 nm处的反射率R (662)比值［R(FP)/R(662)］与C chl-a之间存在显著的相关性,该模型为秋季太湖水体C chl-a的最佳反演模型。在高悬浮泥沙条件下,该模型能够较好地表示出叶绿素荧光高度与叶绿素浓度之间的关系,为C chl-a反演提供新的方法和依据,并为传感器敏感波段的选取和设置提供参考。

Fluorescence Inversion of Chlorophyll a in Taihu Lake at Autumn

Based on the water quality parameters and spectrum data measured in Taihu Lake from November to December 2007.Firstly,using the Gaussian equation to filter and disassemble remote sensing reflectivity to identify the fluorescence reflection peak after the chlorophyll a (chl\|a) 675 nm absorption peak.Then using the 662 nm reflectivity as a benchmark,adopting the normalized fluorescence height method to inverse Chlorophyll a concentration (C chl-a) and got the best inverse model.Based on Gaussian decomposition reflectivity R acquired chl\|a fluorescence reflection peak R(FP) and 662 nm at (662) ratio［R(FP)/R(662)］between C chl-a has a significant correlation .The model is the best inversion model  of the fall Taihu Lake water.In high suspended sediment conditions,the model can be better expressed the relationship of chlorophyll fluorescence height and chlorophyll a concentration.This paper provides a new method and basis for C chl-a  inversion,and provides a reference for the sensor sensitive band selection and settings.