Some bio-optical characteristics of phytoplankton in the NW Indian Ocean
Some bio-optical characteristics of phytoplankton in the NW Indian Ocean
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DOI：
10.3354/meps132299
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发表时间：
1996-02
影响因子：
2.5
通讯作者：
S. Sathyendranath;T. Platt;Stuart;B. Irwin;Veldhuis Mjw;G. Kraay;W. G. Harrison
中科院分区：
文献类型：
--
作者：
S. Sathyendranath;T. Platt;Stuart;B. Irwin;Veldhuis Mjw;G. Kraay;W. G. Harrison
1993年1 - 2月在西北印度洋测量了浮游植物的光吸收和光合作用-光曲线参数。浮游植物的光吸收特征存在一定的区域差异，这可能反映了浮游植物种群的变化。蓝藻（Synecl~ococcus spp）在3个区域均存在，并在索马里海流区浮游植物生物量占主导地位，原绿藻主要局限于索马里海流区；在红海和亚丁湾发现了包括硅藻在内的更大的藻类物种。光合-光曲线的初始斜率aH和同化数pl2的动态范围分别为3.7和3.9，并且似乎与环境co值（如营养物浓度和环境光水平）以及光谱蓝色和红色部分的浮游植物吸收相关。尽管采样仅限于混合层，但是。有一些光适应的证据，表明与光适应速率相比，混合层的垂直混合速率相当慢。光合作用的量子产率变化超过6倍，并且与光谱中蓝色和红色部分吸收的相对变化相关。讨论了这些结果对利用光合作用-光模型计算初级产量的意义，并特别提到了遥感数据在海洋颜色上的应用。
Light absorption by phytoplankton and the parameters of the photosynthesis-light curve were measured in the NW Indian Ocean in January to February 1993. The light absorption characteristics of phytoplankton show some regional differences, probably reflecting changes in the phytoplankton population. cyanobacteria (Synecl~ococcus spp.) were present in all 3 regions and dominated the phytoplankton biomass in the Somali Current area, prochlorophytes were mainly confined to samples from the Somali Current area; and larger algal species, including diatoms, were found in the Red Sea and Gulf of Aden The initial slope aH and the assimilation number PLof the photosynthesis-light curve had dynamic ranges of 3.7 and 3.9, respect~vely, and appeared to be correlated with environmental CO-vanables such as nutrient concentrations and ambient light levels as well as phytoplankton absorption in the blue and red parts of the spectrum. Even though the sampling was confined to the mixed layer, thert. was some evidence of photoadaptation, suggesting that the rate of vertical mixing in the mixed layer was rather slow, compared with photoadaptation rates. The quantum yield of photosynthesis varied over a factor of 6 , and was correlated with relative changes in absorption in the blue and red parts of the spectrum. The implications of these results for computation of primary production using photosynthesis-light models are discussed, with special reference to applications of remotely sensed data on ocean colour.