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首页> 外文期刊>Journal of Physical Oceanography >Interannual Variations in Upper-Ocean Heat Content and Heat Transport Convergence in the Western North Atlantic
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Interannual Variations in Upper-Ocean Heat Content and Heat Transport Convergence in the Western North Atlantic

机译：北大西洋西部大洋热含量和热传输收敛的年际变化

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Subsurface temperature data in the western North Atlantic Ocean are analyzed to study the variations in the heat content above a fixed isotherm and contributions from surface heat fluxes and oceanic processes. The study region is chosen based on the data density; its northern boundary shifts with the Gulf Stream position and its southern boundary shifts to contain constant volume. The temperature profiles are objectively mapped to a uniform grid (0.5° latitude and longitude, 10 m in depth, and 3 months in time). The interannual variations in upper-ocean heat content show good agreement with the changes in the sea surface height from the Ocean Topography Experiment (TOPEX)/Poseidon altimeter; both indicate positive anomalies in 1994 and 1998-99 and negative anomalies in 1996-97. The interannual variations in surface heat fluxes cannot explain the changes in upper-ocean heat storage rate. On the contrary, a positive anomaly in heat released to the atmosphere corresponds to a positive upper-ocean heat content anomaly. The oceanic heat transport, mainly owing to the geostrophic advection, controls the interannual variations in heat storage rate, which suggests that geostrophic advection plays an important role in the air-sea heat exchange. The 18℃ isotherm depth and layer thickness also show good correspondence to the upper-ocean heat content; a deep and thin 18℃ layer corresponds to a positive heat content anomaly. The oceanic transport in each isotherm layer shows an annual cycle, converging heat in winter, and diverging in summer in a warm layer; it also shows interannual variations with the largest heat convergence occurring in even warmer layers during the period of large ocean-to-atmosphere flux.
机译：分析了北大西洋西部的地下温度数据，以研究固定等温线以上的热量含量变化以及地表热通量和海洋过程的贡献。根据数据密度选择研究区域。其北部边界随墨西哥湾流位置而变化，其南部边界随体积变化而变化。将温度曲线客观地映射到一个统一的网格（纬度和经度为0.5°，深度为10 m，时间为3个月）。大洋热量含量的年际变化与海洋地形实验（TOPEX）/波塞冬高度计的海面高度变化显示出良好的一致性；两者均表示1994年和1998-99年为正异常，1996-97年为负异常。表面热通量的年际变化不能解释上层海洋储热率的变化。相反，释放到大气中的热量的正异常对应于上层海洋热量含量的正异常。海洋热传输主要是由于地转对流，控制了储热速率的年际变化，这表明地转对流在海气热交换中起着重要的作用。等温线的18℃深度和层厚也与上层海洋的热量有很好的对应关系。较薄的18℃层对应于正热含量异常。各等温层的海洋运输活动呈年周期变化，冬季热量集中，夏季温暖层发散。它也显示出年际变化，在较大的海洋到大气通量期间，甚至在较暖的层中发生的热收敛最大。

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