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首页> 外文期刊>Estuarine Coastal and Shelf Science >Processes responsible for the formation and maintenance of sub-surface chlorophyll maxima in the Gulf of Finland
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Processes responsible for the formation and maintenance of sub-surface chlorophyll maxima in the Gulf of Finland

机译：负责在芬兰湾形成和维持地下叶绿素最大值的过程

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摘要

Vertical cross-sections of temperature, salinity and Chl a fluorescence distributions in the Gulf of Finland were mapped on 11, 19-20 and 25 July 2006. The sub-surface Chl a maximum layers with thickness varying between 1.5 and 9 m and intensity up to 7.6 μg 1~(-1) were observed in the lower part of the seasonal thermocline within the depth range of 14.5-35 m. Nutrient (PO4~3 , NO2~- + NO3~- ) analyses of water samples collected from the thermocline revealed the coincidence of the location of Chl a maxima and nutriclines. We suggest that the observed Chl a maxima were formed by dinoflagellate Heterocapsa triquetra capable for vertical migration and nutrient uptake in dark. The upward flux of nutrients caused by estuarine circulation and vertical turbulent mixing created favourable conditions for the formation and maintenance of sub-surface Chl a maxima. We explain the observed horizontal patchiness of subsurface Chl a maxima by meso-scale processes - by the accumulation of phytoplankton along the depressed isopycnals at the base of anti-cyclonic circulation cells and by the horizontal convergence of waters in the downwelling area.
机译：芬兰湾的温度，盐度和Chl a荧光分布的垂直剖面图绘制于2006年7月11日，19-20日和25日。地下Chl a的最大层厚度在1.5至9 m之间变化，强度最高。在14.5-35 m深度范围内，在季温跃层的下部观测到7.6〜1μg至7.6μg1〜（-1）。从温跃层中收集的水样的营养素（PO4〜3，NO2〜-+ NO3〜-）分析表明，最大的Chl a和营养素的位置重合。我们建议观察到的最大的Chl a是由能够在黑暗中垂直迁移和吸收养分的鞭毛鞭毛杂藻形成的。由河口循环和垂直湍流混合引起的养分向上流动，为形成和维持地下Chl a max创造了有利条件。我们通过介观尺度过程解释了观测到的最大水下Chl a的水平斑块-通过沿反气旋循环细胞底部凹陷的等速藻类浮游植物的积累以及在下流区水的水平收敛。

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