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首页> 外文期刊>Journal of Physical Oceanography >Overturning Circulation In An Eddy-resolving Model: The Effect Of The Pole-to-pole Temperature Gradient
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Overturning Circulation In An Eddy-resolving Model: The Effect Of The Pole-to-pole Temperature Gradient

机译：涡旋解析模型中的倾覆环流：极间温度梯度的影响

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摘要

The effect of the pole-to-pole surface temperature difference on the deep stratification and the strength of the global meridional overturning circulation (MOC) is examined in an eddy-resolving ocean model configured in an idealized domain roughly representing the Atlantic sector. Mesoscale eddies lead to qualitative differences in the mean stratification and the MOC compared to laminar (i.e., eddy free) models. For example, the spreading of fluid across the model's representation of the Antarctic Circumpolar Current (ACC) no longer relies on the existence of a sill in the ACC. In addition, the deep- and bottom-water masses-roughly representing North Atlantic Deep Water (NADW) and Antarctic Bottom Water (ABW), respectively-are eroded by the eddies so that their zonal and meridional extents are much smaller than in the laminar case. It is found that if the north pole temperature is sufficiently warm, the formation of northern deep water is suppressed and the middepth cell is small and weak while the deep cell is large and vigorous. In contrast, if the north pole temperature is in the range of the southern channel temperatures, the middepth cell is large and strong while the deep cell has a reduced amplitude. This result is consistent with the predictions of the laminar theory of the MOC. In contrast to the laminar theory, realistically strong deep stratification is formed even if the temperature at the northern sinking site is warmer than any temperature found in the channel. Indeed, middepth stratification is actually stronger in the latter case than the former case.
机译：极点之间的表面温度差对深层分层和全球子午翻转环流（MOC）强度的影响在构造为代表大西洋地区的理想化域中构造的涡旋海洋模型中进行了检验。与层流模型（即无涡流）模型相比，中尺度涡流在平均分层和MOC方面导致质的差异。例如，流体在模型的南极圆周极电流（ACC）表示中的扩散不再依赖于ACC中是否存在基台。此外，漩涡分别侵蚀了分别代表北大西洋深水（NADW）和南极底水（ABW）的深水和底水质量，因此它们的纬向和经向范围比层流小得多。案件。发现如果北极温度足够温暖，则北部深水的形成受到抑制，中深层小而弱，深层大而有力。相反，如果北极温度在南通道温度的范围内，则中深单元较大且坚固，而深单元的振幅减小。该结果与MOC层流理论的预测一致。与层流理论相反，即使北部下沉点的温度高于航道中发现的任何温度，也形成了实际上很强的深层。实际上，在后一种情况下，中深度分层实际上比前一种情况更强。

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