夏季太湖水体固有光学参数对光传输行程、积分平均余弦影响的研究

基于2006-07-29～2006-08-01于太湖采集的水体固有光学参数和部分水质参数,利用辐射传输的理论,研究了夏季散射对太湖水体中光传输行程的作用、散射和吸收对光场积分平均余弦的影响,并分析了其可能机制.结果表明,垂直入射的辐射沿入射方向的平均传输行程和积分平均余弦呈现从西北向东南递增的趋势;垂直入射的辐射沿入射方向的平均传输行程、水柱的积分平均余弦与叶绿素a、悬浮物浓度、有机悬浮物浓度及无机悬浮物浓度均呈非线性相关,其关系可用对数函数来描述.本研究对水体中光合有效辐射的环境效应、及建立生物-光学模型有着重要意义.

Effect of Inherent Optical Parameters on Average Penetration Depth of Photon Flux and the Integral Average Cosine of Underwater Light Field in Lake Taihu During Summer

Based on the inherent optical parameters of the water and water quality data in lake Taihu from 2006-07-29 to 2006-08-01, the effect of scattering on the penetration path along the original direction of the flux and the Integral average cosine of underwater light field were study by the radiative transfer theory, and the possible mechanism was analyzed. There were increasing trend from northwest to southeast of them. There were a nonlinear relation between them and concentration of Chl-a, suspended matter, inorganism matter, organism matter. The relation was described by logarithmic function. The study was helpful for bio-optical model and the environmental effects of photosynthetic active radiation in waters.