太湖水体浮游藻类吸收系数分离方法研究  

Study on Partitioning of Phytoplankton Absorption Coefficient from Total Spectral Absorption in Taihu Lake

作　　者：乐成峰[1] 李云梅[1] 查勇[1] 尹斌[1] 张红[1] 

机构地区：[1]南京师范大学虚拟地理环境教育部重点实验室,江苏南京210046

出　　处：《光学学报》2010年第11期3090-3096,共7页Acta Optica Sinica

基　　金："十一五"国家科技支撑计划(2008BAC34B05);国家自然科学基金(40971215);国家科技重大专项(20083050);江苏省研究生创新计划(CX08B_014Z);南京师范大学优秀博士论文(181200000223)资助课题

摘　　要：利用太湖实测水色因子吸收系数数据,根据非藻类颗粒物与有色可溶性有机物(CDOM)吸收相似的特性,采用两者合并参数化方案,并结合浮游藻类吸收系数在580 nm与692 nm波长处比值恒定的特点,提出了适合于太湖的基于水体总吸收的浮游藻类吸收系数分离方法,并从数值和光谱曲线特征等方面对分离效果进行了评价。结果表明,浮游藻类吸收能够较好地从水体的总吸收中分离出来,在440,550和675 nm波段处,吸收系数的分离效果都较好,其中在675 nm波段分离平均相对误差在10%以内;分离得到的浮游藻类吸收光谱整体上保持了其原有的特征,与实测光谱具有很好的相似性,平均相似度在0.97以上。A method for partitioning phytoplankton absorption coefficient is developed in this study using in situ sampling dataset collected from Taihu Lake.Because the absorption of non-algal particles and colored dissolved organic matter（CDOM） has similar optical properties,their absorption coefficients are combined to parameterize by the method.The ratio of phytoplankton absorption coefficient at 580 nm and 692 nm is also used in the method because of its consistence.The performance of the method is assessed both in magnitude and spectral characteristic.The results indicate that the absorption of phytoplankton can be well divided from the total absorption.The method has good performance at band 440,550 and 675 nm in phytoplankton absorption partition,and the mean relative error is less than 10% at band 675 nm.The phytoplankton absorption spectra partitioned from total spectral absorption keeps its inherent character,and fits with measured ones perfectly,the mean similarity coefficient（SC） of them can reach 0.97.

关 键 词：信号处理 太湖 浮游藻类 吸收系数 分离方法 

分 类 号：P733.3[天文地球—物理海洋学]