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首页> 外文期刊>Journal of Physical Oceanography >Dynamics of the Southern Tsuchiya Jet
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Dynamics of the Southern Tsuchiya Jet

机译：土屋南部喷气机的动力学

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The Tsuchiya jets (TJs) are narrow eastward currents, located a few degrees on either side of the equator at depths from 200 to 500 m in the Pacific Ocean. In this study, non-eddy-resolving, oceanic general circulation models (OGCMs) are used to investigate the dynamics of the southern TJ. Most solutions are found in a rectangular basin extending 100° zonally and from 40°S to 10°N. They are forced by idealized zonal and meridional winds representing the trades and the southerly winds near the South American coast, by a prescribed interocean circulation (IOC) that enters the basin through the southern boundary and exits through the western boundary from 2° to 6°N (the model's Indonesian passages), and by surface heating that warms the ocean in the Tropics. A suite of solutions is presented to isolate effects of each forcing and mixing process. A few solutions are also found to a global OGCM driven by realistic forcings. Solutions forced by all of the aforementioned processes and with minimal diffusion resemble the observed flow field in the tropical South Pacific. A narrow eastward current, the model southern TJ, flows across the basin along the southern edge of a thick equatorial thermostad, and upwells at the eastern boundary. Its deeper part is supplied by water that leaves the western boundary current somewhat south of the equator. Its shallower part originates from water that diverges from the deep portion of the Equatorial Undercurrent (EUC); as a result, the TJ transport increases to the east and the TJ warms as it flows across the basin. A major part of the water that upwells at the eastern boundary is supplied by the TJ with a minor contribution from the southern boundary region. In idealized-basin solutions without forcing either by the IOC or meridional wind, the TJ is weak or absent. These, and other, properties suggest that the dynamics of the model's TJ are those of an arrested front, which in a 2 1/2-layer model are generated when characteristics of the flow merge or intersect. When diffusivity is increased to commonly used values, the thermostad is less well defined or even absent and the TJ is weak, suggesting that excessive diffusion is the reason why TJs are not present in many previous OGCMs. In the solution to a global OGCM, the southern TJ still exists without the IOC, although it is warmed by 1℃, indicating that much of its water is supplied by an overturning cell confined within the Pacific basin.
机译：Tsuchiya喷流（TJs）是狭窄的东流，位于太平洋赤道两侧几度处，深度为200至500 m。在这项研究中，使用非涡旋解析的海洋总环流模型（OGCM）来研究TJ南部的动力学。大多数解决方案都位于一个矩形的盆地中，该盆地的纬度为100°，从40°S到10°N。它们受到代表贸易的理想的纬向和经向风以及南美海岸附近的南风的推动，并受到规定的海洋环流（IOC）的影响，该环流从南部边界进入盆地，并从2°到6°穿过西部边界离开N（该模型的印尼通道），以及通过加热热带地区海洋的表面加热。提出了一套解决方案，以隔离每个强制和混合过程的影响。还发现了由现实强迫驱动的全球OGCM的一些解决方案。由上述所有过程推动且具有最小扩散的解决方案类似于热带南太平洋的观测流场。狭窄的向东流，即TJ型南部，沿着厚赤道热区的南部边缘流经盆地，并在东部边界向上流。它的更深部分是由水供应的，离开西部边界流到赤道以南。它的较浅部分来自于从赤道暗流（EUC）的较深部分发散的水。结果，TJ运移向东部增加，并且TJ在流经盆地时变暖。东部边界上流的大部分水是由TJ供应的，南部边界区域的贡献很小。在理想化的流域解决方案中，在没有受到IOC或子午风强迫的情况下，TJ弱或不存在。这些和其他属性表明，模型TJ的动力学是停滞前沿的动力学，在流动的特征合并或相交时，在2 1/2层模型中会生成该动力学。当扩散率增加到常用值时，温度稳定系数的定义不充分甚至不存在，并且TJ较弱，这表明过度扩散是许多以前的OGCM中不存在TJ的原因。在全球OGCM的解决方案中，尽管温度升高了1℃，但南部TJ仍不存在IOC，这表明其大部分水是由太平洋盆地内的倾覆单元提供的。

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