Photosynthesis characteristics of the phytoplankton in the Celtic Sea during late spring
Photosynthesis characteristics of the phytoplankton in the Celtic Sea during late spring
复制标题
晚春凯尔特海浮游植物光合作用特征
DOI：
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发表时间：
1993
期刊：
影响因子：
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通讯作者：
M. Fasham
中科院分区：
文献类型：
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作者：
T. Platt;S. Sathyendranath;I. Joint;M. Fasham
在晚春前往凯尔特海的为期三周的航行中，在一个名义上的站对浮游植物的光合作用特征进行了跟踪。对按尺寸分级的样品以及整个样品进行了观察。小颗粒（1 μm 部分）的特性在光合作用-光曲线的参数 aB（初始斜率）和 PBm（同化数）以及这些参数对环境协变量的依赖性方面有所不同。这些差异是解释未分级样品性质波动的部分困难的原因。光学分析产生了一种在无法进行水下辐照度测量的日子里以高置信度估计光深度的方法。在整个航行过程中，光合色素的垂直轮廓的形状以系统的方式发生变化。讨论了水柱初级生产计算的含义。在凯尔特海，春末时节，使用假设水柱均匀的非光谱模型来计算初级生产力，与允许垂直分层的全光谱模型的结果相比，将导致高达 20% 的差异。
During a three-week cruise to the Celtic Sea in late spring, the photosynthesis characteristics of the phytoplankton were followed at a single, nominal station. Observations were made on size–fractionated samples as well as on whole samples. The properties of the small ( 1 μm fraction) differed with respect to the parameters aB (initial slope) and PBm (assimilation number) of the photosynthesis-light curve and to the dependence of these parameters on environmental covariables. These differences account for some of the difficulty in explaining fluctuations in properties of unfractionated samples. Optical analysis leads to a method for estimation of photic depth, with high confidence, for days on which underwater irradiance measurements were not available. The shape of the vertical profile of photosynthetic pigments changed in a systematic way throughout the cruise. The implications for calculation of water-column primary production are discussed. In the Celtic Sea, during late spring, use of a non-spectral model assuming uniform water column for computation of primary production will lead to differences of up to 20% compared with the results of a fully spectral model that admits vertical stratification.