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首页> 外文期刊>Journal of Physical Oceanography >Global Ocean Circulation Modes Derived from a Multiple Box Model
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Global Ocean Circulation Modes Derived from a Multiple Box Model

机译：多箱模型推导的全球海洋环流模式

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A 16-box model of the global ocean circulation is constructed to investigate the sensitivity of the thermohaline circulation to upper-ocean density perturbations. The model attempts to represent the main geographical components of the global ocean and is tuned to give a present-day circulation broadly compatible with observed volume fluxes. Extensive tests are made of the model's sensitivity to upper-ocean density perturbations, equivalent to a range of ±3 psu in salinity about the current climate. It is found that there are seven separate modes of thermohaline circulation that can occur within the model's constraints, as well as the possibility of significant variations in the strength of the current circulation mode. These modes are related to possible changes in surface forcing, such as the abrupt increase in freshwater from ice-sheet melting, where such a possibility exists. A mode with North Atlantic upwelling rather than deep- or bottom-water formation was found to occur with large additional inputs of freshwater to the northern Atlantic. These freshwater inputs needed to be equivalent to an instantaneously reduction of upper-ocean salinity by at least 1.8 psu. The model was unable to produce deep-water formation in the northern Pacific, although this may be a constraint of the model formulation. Bottom-water production was possible in the Indian and Pacific Oceans provided the surface density was much enhanced, beyond likely changes in evaporation and precipitation.
机译：建立了一个由16个盒子组成的全球海洋环流模型，以研究热盐环流对上层海洋密度扰动的敏感性。该模型试图代表全球海洋的主要地理成分，并进行了调整，以提供与观测到的体积通量大致兼容的当今环流。对该模型对上层海洋密度扰动的敏感性进行了广泛的测试，相当于当前气候下盐度的±3 psu范围。发现在模型的约束范围内可能会出现七种不同的热盐环流模式，以及当前循环模式强度可能发生重大变化的可能性。这些模式与表面强迫的可能变化有关，例如存在这种可能性的冰盖融化导致淡水突然增加。发现在北大西洋上流而不是深水或底水形成的一种模式发生了，同时向北大西洋增加了大量的淡水输入。这些淡水输入量必须相当于瞬时使上海洋盐度降低至少1.8 psu。该模型无法在北太平洋产生深水形成，尽管这可能是模型制定的约束。只要表面密度大大提高，而蒸发和降水的变化可能不大，印度洋和太平洋就有可能进行底水生产。

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