Spectral absorption coefficient of phytoplankton and its relation to chlorophyll a and remote sensing reflectance in coastal waters of southern China  

作　　者：CAOWenxi YANGYuezhong LIUSheng XUXiaoqiang YANGDingtian ZHANGJianlin 

机构地区：[1]LEDLaboratory,SouthChinaSeaInstituteofOceanology,ChineseAcademyofSciences,Guangzhou510301,China

出　　处：《Progress in Natural Science:Materials International》2005年第4期342-350,共9页自然科学进展·国际材料（英文版）

基　　金：SupportedbytheNationalNaturalScienceFoundationofChina (Grants 40 0 760 12 ;40 4760 19;40 2 2 90 0 8) ;andbySCSIO (GrantLYQY2 0 0 3 0 4)

摘　　要：The spectral absorption coefficient of phytoplankton in coastal waters ofsouthern China is investigated. Large variations in the absorption coefficient of phytoplankton arefound. The absorption coefficient of phytoplankton at 443 nm ranged from 0. 006 m^(-1) to 0. 484m^(-1), with an average value of 0.067 m^(-1). The chlorophyll-specific absorption coefficient ofphytoplankton is also a bio-optical variable, with a spectrally averaged value of 0. 025 m^2 centredot mg^(-1). The variations of chlorophyll-specific absorption coefficient are mainly attributed topigment composition of phytoplankton and package effect. The chlorophyll-specific absorptioncoefficient of phytoplankton decreases with the increasing of chlorophyll a concentration. Thisrelationship can be described by a power law function, with the parameters and the coefficient ofdetermination r^2 as functions of wavelength, but the parameters describing the relationships inpresent study differed from that in Case 1 waters, thus theregional adjustment of model parameterswas of particular significance for improving the accuracy of bio-optical algorithms for estimationof Chl-a concentration and primary production from remotely sensed data. Regression analysis ofreflectance (R_(rs)) ratio and absorption coefficient of phytoplankton (alpha_(ph)) indicates aclose correlation between them, which means that it is possible to retrieve absorption coefficientof phytoplankton using ocean color remote sensing data in optically complex coastal waters.The spectral absorption coefficient of phytoplankton in coastal waters of southern China is investigated. Large variations in the absorption coefficient of phytoplankton are found. The absorption coefficient of phytoplankton at 443 nm ranged from 0.006 m -1 to 0.484 m -1 , with an average value of 0.067 m -1 . The chlorophyll specific absorption coefficient of phytoplankton is also a bio optical variable, with a spectrally averaged value of 0.025 m 2·mg -1 . The variations of chlorophyll specific absorption coefficient are mainly attributed to pigment composition of phytoplankton and package effect. The chlorophyll specific absorption coefficient of phytoplankton decreases with the increasing of chlorophyll a concentration. This relationship can be described by a power law function, with the parameters and the coefficient of determination r 2 as functions of wavelength,but the parameters describing the relationships in present study differed from that in Case 1 waters, thus the regional adjustment of model parameters was of particular significance for improving the accuracy of bio optical algorithms for estimation of Chl a concentration and primary production from remotely sensed data. Regression analysis of reflectance ( R rs ) ratio and absorption coefficient of phytoplankton ( a ph ) indicates a close correlation between them, which means that it is possible to retrieve absorption coefficient of phytoplankton using ocean color remote sensing data in optically complex coastal waters.

关 键 词：absorption coefficient PHYTOPLANKTON CHLOROPHYLL remote sensing bio-optical model coastal waters 

分 类 号：Q948.891[生物学—植物学]