摘要
海水中总颗粒物的吸收系数可表达成非藻类颗粒物与浮游植物的吸收系数之和,利用可定量测量的滤膜技术(QFT)测定水体中颗粒物光谱吸收系数。非藻类颗粒物的吸收系数随着波长的增大而减小,可用指数衰减规律来描述;光谱斜率S较离散,但平均值与文献报道的一类水体S的平均值很接近;光谱截距ad0(λ0)随盐度增大而减小,二者有很好的线性关系。浮游植物的比吸收系数和叶绿素a浓度之间存在非线性关系,但是,比吸收系数与叶绿素a浓度之间的非线性关系同时还与波长有关,在叶绿素a的2个吸收峰443nm和670nm附近非线性关系特别明显,而在530—640nm之间两者的非线性关系则较弱。
The absorption coefficient of particulates in seawater can be partitioned into the absorption coefficients of non-algal particulates and phytoplankton. Using the quantitative filter technique (QFT), the absorption coefficient of particulates in seawater was determined. The coefficient of non-algal particulates is decreasing with the increase of wavelength, which can be described by exponential law. The spectral slope, S, is discrete in the Zhujiang River Mouth, but its average is similar to the reports of Roesler (1998) and Bricaud (1998). The spectral intercept is decreasing with the increase of salinity, and there is a good linear relationship between them. The specific absorption coefficient of phytoplankton follows a power law as a function of chlorophyll concentration. However, the significance of this nonlinear relationship is affected by wavelength. For example, a nonlinear relationship is marked at 443nm and 670nm, but feeble between 530nm and 640nm.
出处
《热带海洋学报》
CAS
CSCD
北大核心
2004年第5期63-71,共9页
Journal of Tropical Oceanography
基金
国家自然科学基金项目(40076012)
中国科学院领域前沿项目(LYQY200304)
关键词
珠江口
光谱吸收系数
生物光学模式
颗粒物
Zhujiang River Mouth
spectral absorption coefficient
bio-optics model
particulate matter
