[Optical properties and remote sensing retrieval model of diffuse attenuation coefficient of Taihu Lake water body].
The spectral and chemical analytical data of Taihu Lake water quality in Nov. 8-22, 2007 were used to analyze the spectral characteristics of diffuse attenuation coefficient (Kd) of the water body in autumn and related affecting factors. On the basis of this analysis, the Kd at band 490 nm, Kd (490), was used as a variable to build the relationship between Kd and remote sensing reflectance. The results indicated that within the scope of visible band, the Kd of the water body at most locations of Taihu Lake presented an exponent decreasing trend with the increase of wave length. Due to the higher concentration of phytoplankton in some locations, a peak value of Kd was presented at band 675 nm. Non-organic suspended particles, because of their higher content in suspended sediment, had larger effects on Kd than organic suspended ones. There was a good correlation between Kd and remote sensing reflectance. Taking Rrs (550), Rrs (675) and Rrs (731) as independent variables and doing regression analysis with Kd (490), a good linear relationship was found between Kd (490) and Rrs (731), and multi-variate linear regression analysis using variables Rrs (550), Rrs (675) and Rrs (731) could get better effect (R2 > 0.96) than the regression analysis using variable Rrs (731).
Le
Cheng-Feng
CF
Ministry of Education Key Laboratory of Virtual Geographic Environment, Nanjing Normal University, Nanjing 210046, China. lcf320@126.com
Li
Yun-Mei
YM
Zha
Yong
Y
Sun
De-Yong
DY
Wang
Li-Zhen
LZ
D002681:China; D004784:Environmental Monitoring / Q000379:methods*; D005618:Fresh Water / Q000032:analysis*; D008962:Models, Theoretical; D009391:Nephelometry and Turbidimetry; D055095:Optics and Photonics; D010316:Particle Size; D052638:Particulate Matter / Q000032:analysis; D010777:Photochemistry; D012542:Scattering, Radiation
D052638:Particulate Matter