摘要
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。
Chlorophyll a concentration and specific absorption coefficient aph^＊ of phytoplankton were determined using the wet filter technique in the northern South China Sea in September 2004. The variations in the magnitude of aph^＊ are accompanied by the changes of spectrum shape. The mean value of aph^＊ 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 aph^＊ is mainly affected by pigment composition and pigment package effect. In the open ocean, the pico-phytoplankton plays a dominant role; while in nearshore water, the percentages of nano-phytoplankton and micro-phytoplankton tend to increase, resulting in the increase of package effect and the decrease of aph^＊. The vertical changes of aph^＊ in the open ocean exhibits a negative relationship to Chl. a concentration （[Chl. a]）, and the changes in spectrum shape indicates a influence of pigment composition on aph^＊. aph^＊ tends to decrease with increase of [Chl. a], fitting the relationship of power function.
出处
《热带海洋学报》
CAS
CSCD
北大核心
2005年第5期1-10,共10页
Journal of Tropical Oceanography
基金
国家自然科学基金资助项目(40476019)
中国科学院南海海洋研究所领域前沿课题(LYQY200304)
关键词
浮游植物比吸收系数
叶绿素A
生物-光学模式
南海北部
specific absorption coefficient of phytoplankton
chlorophyll a
bio-optical model
northern South China Sea
