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湖泊科学  2011 

太湖冬季有色可溶性有机物吸收荧光特性及遥感算法

DOI: 10.18307/2011.0306

Keywords: 有色可溶性有机物,荧光,遥感反射率,BP神经网络模型,太湖

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Abstract:

基于2006年和2007年1月两次太湖采样,对50个点位的有色可溶性有机物(CDOM)光谱吸收、荧光、溶解性有机碳(DOC)浓度及遥感反射率进行测定与分析,探讨冬季太湖CDOM的吸收荧光特性及空间分布,建立CDOM吸收系数的遥感反演算法.结果表明,太湖冬季CDOM在355nm处吸收系数a(355)变化范围和均值分别为1.83-7.34m-1、3.37±1.01m-1,相应的荧光及DOC浓度变化范围、均值分别为9.79-29.18N.FL.U、13.4±3.37N.FL.U;4.61-10.45mg/L、6.37±1.24mg/L.CDOM吸收系数、CDOM荧光值、DOC浓度三者呈显著正相关.空间分布上,两次调查均显示CDOM吸收系数、CDOM荧光值、DOC浓度呈现出明显的南低北高,最大值都出现在太湖北部的藻型湖区梅梁湾内,最小值则在东太湖和贡湖湾2个草型湖区.通过单波段、一阶微分和BP神经网络模型3种不同CDOM反演方法精度的分析、比较发现,BP神经网络模型反演结果最好,模型验证的相对均方根误差和平均相对误差分别为14.9%、11.7%,可以用于冬季太湖CDOM吸收系数a(355)的遥感估算.

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