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首页> 外文期刊>Journal of oceanography >Mesoscale eddy effects on temporal variability of surface chlorophyll a in the Kuroshio Extension
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Mesoscale eddy effects on temporal variability of surface chlorophyll a in the Kuroshio Extension

机译：中尺度涡流对黑潮延伸区表面叶绿素a时间变异的影响

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We investigated the relationship between chlorophyll a (Chl-a) concentrations estimated from satellite observations and the activity of eddies in the Kuroshio Extension region. High (low) area-averaged Chl-a concentrations were frequently observed in the core of cyclonic (anticyclonic) eddies. Such relationships between Chl-a concentrations and eddy cores were not frequently observed in the southern part of the recirculation gyre, and advection of background meridional gradient of Chl-a by eddy-edge currents accounted for Chl-a spatial variability. Decadal-scale changes of Chl-a concentrations around the Kuroshio Extension were strongly affected by eddy activity and transport but not by large-scale near-surface isopycnal heaving. We also found that decadal changes of nutrient concentrations near the main stream could affect Chl-a concentrations in the southern part of the recirculation gyre via southward transport of eddies and mean flow.
机译：我们调查了根据卫星观测估计的叶绿素a（Chl-a）浓度与黑潮延伸区涡流活动之间的关系。在旋风（反气旋）涡流的核心经常观察到高（低）平均Chl-a浓度。 Chl-a浓度与涡流核心之间的这种关系在再循环环流的南部并不经常观察到，而涡流边缘电流对Chl-a的本底子午线梯度的平流解释了Chl-a的空间变异性。黑潮延伸区周围Chl-a浓度的年代尺度变化受涡流活动和运输的强烈影响，但不受大规模近地表等渗线的影响。我们还发现，主流附近养分浓度的年代际变化可能会通过涡流和平均流量的向南传播，影响再循环环南部的Chl-a浓度。

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