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| | 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... | | 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。 | | 文摘来源 | | Chlorophyll a concentration and specific absorption coefficient a~()_(ph) of phytoplankton were determined using the wet filter technique in the northern South China Sea in September 2004.The variations in the magnitude of a~()_(ph) are accompanied by the changes of spectrum shape.The mean value of a~()_(ph) is 0.137 m~(2) mg~(-1) at 440nm and 0.047 m~(2)·mg~(-1) at 670nm,with significant differences between nearshore and open ocean stations.The variability of a~()_(ph) is mainly affected by pigment com... | | 在2004年9月南海北部开放航次中测定了51个站点的浮游植物比吸收系数ap*h(λ)。分析表明,ap*h的数值和光谱分布都有较大的变化,且在沿岸和外海表现出不同的变化趋势。ap*h的变化主要受色素打包效应和色素成分的影响。外海水体微微型藻类占绝对优势,而沿岸水体中微型藻类和大型藻类的比例相对增大,相应地色素打包效应增强,ap*h减小。外海水体的ap*h光谱分布随深度的增加呈现出一定的变化趋势,且在上层水体的蓝红比较高,反映出辅助色素含量的相对变化对比吸收系数的影响。ap*h随叶绿素a浓度的增大而减小,两者之间呈现出较好的幂指数关系。 | | 文摘来源 | |   |
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