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Observations of cross-frontal exchange associated with submesoscale features along the North Wall of the Gulf Stream

机译：沿着海湾溪流北壁的亚透视特征的跨前交换观察

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Using high-resolution measurements of the Gulf Stream North Wall (GSNW), we investigated whether detachments from the warm current at the edge of the front, known as streamers, affect the overall heat and salt content of the region. Temperature, salinity, and velocity data were collected across the front from towed CTDs, shipboard ADCPs, and gliders following a Lagrangian drifter that was deployed at the GSNW during winter 2012. Four streamers were identified, all of which expanded laterally 10-15 km, with vertical salinity interleaving down to a 200 m depth. We observed that temperature and salinity (T/S) increased along the trajectory of the Lagrangian float. These trends were density compensated and ranged from the surface down to a 200 m depth and across a 5 km band. The heat and salt budget analysis showed that surface fluxes, advection due to large-scale circulation, and diapycnal mixing could not explain the observed increase in T/S in the mixed layer and in the subsurface area. The only possible source that could explained the increase in T/S was along-isopyc-nal mixing. Estimates of the Reynolds transport supported this conclusion, although the low number of realizations meant these estimates were not statistically significant. From the heat and salt budgets, we observed that an along-isopycnal diffusivity,κ_i, of 110±30m~2s~(-1) accounted for the estimated residual and matched the Reynolds transport estimates. This value of κ_i is consistent with other studies that assert that lateral mixing is required for the production of Eighteen Degree Water (EDW) subtropical mode water.
机译：使用海湾溪流北墙（GSNW）的高分辨率测量，我们研究了从前线边缘处的暖电流的脱离，称为飘带，影响该区域的总热量和盐含量。在2012年冬季在GSNW部署的拉格朗日漂移之后，在拖曳CTDS，船上ADCP和滑翔机上收集了温度，盐度和速度数据。识别出四个飘带，所有这些炉子都在横向扩增10-15公里，垂直盐度缠结至200米深度。我们观察到，温度和盐度（T / s）沿拉格朗日浮法的轨迹增加。这些趋势是密度补偿，从表面到达200米深度，横跨5公里的频段。热量和盐预算分析表明，表面助熔剂，由于大规模循环引起的平流，并且延迟混合不能解释混合层中的T / S中的观察到的增加和地下区域。可以解释T / S增加的唯一可能的来源是沿着ISOPYC-NAL混合的。雷诺运输的估计支持了这一结论，尽管较少的实现意味着这些估计没有统计学意义。从热量和盐预算中，我们观察到沿着等成的差异κ_i，110±30m〜2s〜（-1）占估计的剩余和匹配雷诺运输估算。 κ_i的这种值与其他研究一致，这些研究是为了生产18度的水（EDW）亚热带模式水所需的横向混合。

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  • 来源
    《Oceanographic Literature Review》 |2020年第10期|2087-2087|共1页
  • 作者

    A. Sanchez- Rios; R.K. Shearman; J. Klymak;

  • 作者单位

    Institute of Oceanography National Taiwan University Taipei Taiwan;

    Institute of Oceanography National Taiwan University Taipei Taiwan;

    Institute of Oceanography National Taiwan University Taipei Taiwan;

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