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首页> 外文期刊>Journal of Physical Oceanography >Decomposition of Vertical Velocity for Nutrient Transport in the Upper Ocean
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Decomposition of Vertical Velocity for Nutrient Transport in the Upper Ocean

机译：上海营养转运垂直速度的分解

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Within the pycnocline, where diapycnal mixing is suppressed, both the vertical movement (uplift) of isopycnal surfaces and upward motion along sloping isopycnals supply nutrients to the euphotic layer, but the relative importance of each of these mechanisms is unknown. We present a method for decomposing vertical velocity w into two components in a Lagrangian frame: vertical velocity along sloping isopycnal surfaces and the adiabatic vertical velocity of isopycnal surfaces . We show that , where is the isopycnal slope and is the geometric aspect ratio of the flow, and that accounts for 10%-25% of the total vertical velocity w for isopycnal slopes representative of the midlatitude pycnocline. We perform the decomposition of w in a process study model of a midlatitude eddying flow field generated with a range of isopycnal slopes. A spectral decomposition of the velocity components shows that while is the largest contributor to vertical velocity, is of comparable magnitude at horizontal scales less than about 10 km, that is, at submesoscales. Increasing the horizontal grid resolution of models is known to increase vertical velocity; this increase is disproportionately due to better resolution of , as is shown here by comparing 1- and 4-km resolution model runs. Along-isopycnal vertical transport can be an important contributor to the vertical flux of tracers, including oxygen, nutrients, and chlorophyll, although we find weak covariance between vertical velocity and nutrient anomaly in our model.
机译：在Pycnocline内，抑制了二进多头混合的，沿着倾斜的等体基表面的垂直运动（隆起）和向上运动向Euphotic层供应营养物，但是这些机制中的每一个的相对重要性是未知的。我们介绍了一种用于将垂直速度W分解成拉格朗日框架中的两个组件：沿着倾斜的斜面表面的垂直速度和等素表面的绝热垂直速度。我们表明，等离子斜率在哪里，并且是流量的几何纵横比，并且该占垂直速度总速度W的10％-25％，用于代表中部曲线的异构斜率。我们在用一系列等渗斜率产生的中间涡流场的过程研究模型中执行W的分解。速度分量的光谱分解表明，虽然是垂直速度的最大贡献者，但水平尺度的相当数量在小于约10km，即在碱基上。众所周知，增加模型的水平网格分辨率增加垂直速度;由于更好的分辨率，这增加了这种增加，通过比较1和4公里分辨率的模型运行，如此。沿着等渗垂直运输可以是跟踪器的垂直通量的重要贡献者，包括氧气，营养素和叶绿素，尽管我们在我们的模型中发现了垂直速度和营养异常之间的弱协方差。

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