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首页> 外文期刊>Journal of Physical Oceanography >The Effect of Salinity on the Wind-Driven Circulation and the Thermal Structure of the Upper Ocean
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The Effect of Salinity on the Wind-Driven Circulation and the Thermal Structure of the Upper Ocean

机译：盐度对上层海洋风动力环流和热力结构的影响

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摘要

Studies of the effect of a freshening of the surface waters in high latitudes on the oceanic circulation have thus far focused almost entirely on the deep thermohaline circulation and its poleward heat transport. Here it is demonstrated, by means of an idealized general circulation model, that a similar freshening can also affect the shallow, wind-driven circulation of the ventilated thermocline and its heat transport from regions of gain (mainly in the upwelling zones of low latitudes) to regions of loss in higher latitudes. A freshening that decreases the surface density gradient between low and high latitudes reduces this poleward heat transport, thus forcing the ocean to gain less heat in order to maintain a balanced heat budget. The result is a deepening of the equatorial thermocline. (The deeper the thermocline in equatorial upwelling zones is, the less heat the ocean gains.) For a sufficiently strong freshwater forcing, the poleward heat transport all but vanishes, and permanently warm conditions prevail in the Tropics. The approach to warm oceanic conditions is shown to introduce a bifurcation mechanism for the north-south asymmetry of the thermal and salinity structure of the upper ocean.
机译：迄今为止，对高纬度地表水新鲜化对海洋环流影响的研究几乎完全集中在深热盐环流及其极向热传输上。在这里，通过理想化的一般环流模型证明，类似的新鲜度也可以影响通风的热跃层的浅风驱动循环及其从增益区（主要在低纬度上升带）的传热到高纬度地区。降低低纬度和高纬度之间的表面密度梯度的清新作用会减少这种极向热传递，从而迫使海洋吸收更少的热量，以维持平衡的热量收支。结果是赤道温跃层的加深。 （赤道上升区的温跃层越深，海洋获得的热量就越少。）对于足够强大的淡水强迫，极向热传递几乎消失，并且热带地区普遍存在永久温暖的条件。结果表明，在温暖的海洋条件下，引入了一种分叉机制，使上层海洋的热度和盐度结构呈南北不对称。

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