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首页> 外文期刊>Journal of oceanography >Diel Patterns in Chlorophyll a Specific Absorption Coefficient and Absorption Efficiency Factor of Picoplankton
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Diel Patterns in Chlorophyll a Specific Absorption Coefficient and Absorption Efficiency Factor of Picoplankton

机译：叶绿素中的Diel模式-浮游植物的特定吸收系数和吸收效率因子

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摘要

Diel patterns in the chlorophyll a specific absorption coefficient of surface picoplankton, a~*_(pico) (λ) (m~2·[mg chlorophyll a]~(-1)), were studied at 7 stations under daily cycle of in situ light condition in the western subarctic Pacific and Japan Sea. All the data were normalized by dividing the anomaly with daily averaged a~*_(pico) (λ). Opposite diel patterns were observed for the normalized a~*_(pico) (443) and a~*_(pico) (675) with maximum toward dawn or dusk and minimum toward midday at 4 stations under low-irradiance (LI) conditions and vice versa at 3 stations under high-irradiance (HI) conditions. The absorption efficiency factors at red absorption peak, Q_a (675), were determined by reconstruction with intracellular chlorophyll a concentration and cell diameter. The normalized Q_a (675) also showed diel pattern with maximum toward midday and minimum toward dawn or dusk under LI. The diel pattern in a~*_(pico) (675) and Q_a (675) were primarily caused by changes in intracellular chlorophyll a concentration due to photoadaptation under LI. The diel pattern in a~*_(pico) (443) was influenced by pigmentation, as recognized by blue to red ratio [a~*_(pico) (443)/a~*_(pico) (675)] under HI. This study proposed that the opposite diel pattern in ~*_(pico) (λ) might occur for a wide range of algal species. The results presented here have important consequences for the interpretation of diel variations in optical properties observed in the open ocean.
机译：研究了在7个站点的叶绿素a的每日周期下叶绿素a的表面皮浮游生物的特定吸收系数a〜* _（pico）（λ）（m〜2·[mg叶绿素a]〜（-1））的Diel模式。西北极和日本海的原位光照条件。通过将异常除以每日平均a〜* _（pico）（λ），对所有数据进行归一化。在低辐照度（LI）条件下，在4个观测站，标准化的a〜* _（pico）（443）和a〜* _（pico）（675）观察到相反的diel模式，最大朝黎明或黄昏，最小朝中午。反之亦然，在高辐照度（HI）条件下在3个站点上反之亦然。通过用细胞内叶绿素a浓度和细胞直径重建来确定红色吸收峰Q_a（675）处的吸收效率因子。归一化的Q_a（675）也显示出迪尔模式，在LI下朝中午最大，朝黎明或黄昏最小。 a〜* _（pico）（675）和Q_a（675）中的diel模式主要是由于LI下的光适应引起的细胞内叶绿素a浓度的变化引起的。 a〜* _（pico）（443）中的diel图案受色素沉着的影响，可以通过在以下条件下的蓝与红比[a〜* _（pico）（443）/ a〜* _（pico）（675）]来识别嗨这项研究表明，〜* _（pico）（λ）中相反的diel模式可能会在多种藻类中发生。此处给出的结果对于解释在公海中观察到的光学特性的狄尔变化具有重要意义。

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