Circulation

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Circulation

机译：循环

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A recent paper by Hu et al. has raised the interesting question of whether the ocean circulation has been "speeding up" in the last decades. Their result contrasts with some estimates of the lack of major trends in oceanic surface gravity waves and wind stress. In general, both the increased energy and implied power inputs of the calculated circulation correspond to a small fraction of the very noisy background values. An example is the implied power increase of about 3 10~8 W, as compared to wind energy inputs of order 10~(12) W. Here the problem is reexamined using a state estimate that has the virtue of being energy, mass, etc. conserving. Because it is an estimate over an entire recent 26-yr interval, it is less sensitive to the strong changes in observational data density and distribution, and it does not rely upon nonconservative "reanalyses." The focus is on the energy lying in the surface layers of the ocean. A potential energy increase is found, but it is almost completely unavailable-arising from the increase in mean sea level. A weak increase in kinetic energy in the top layer (10 m) is confirmed, corresponding to an increase of order 1 cm s~(-1) yr~(-1) over 26 years. An estimate of kinetic energy in the full water column shows no monotonic trend, but the changes in the corresponding available potential energy are not calculated here.

机译：最近的纸张由胡等人。在过去的几十年中提出了海洋循环是否“加速”的有趣问题。它们的结果与缺乏海面重力波和风力胁迫的缺乏主要趋势的估计形成鲜明对比。通常，计算的循环的增加的能量和暗示功率输入对应于非常嘈杂的背景值的一小部分。一个例子是暗示的电力增加约310〜8 W，与风能输入有序10〜（12）W.这里使用具有能量，质量等的状态估计来重新审视问题。节约。因为它是在整个最近的26年间隔内估计，所以它对观察数据密度和分布的强烈变化不太敏感，并且它不依赖于非服务率的“Reanalyses”。重点是在海洋表面层的能量上。发现了潜在的能量增加，但它几乎完全不可用导致平均海平面的增加。确认顶层（10μm）中动能的弱增加，对应于26岁以上增加1cm S〜（-1）Yr〜（-1）。全水柱中动能的估计显示没有单调趋势，但这里没有计算相应的可用势能的变化。

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《Oceanographic Literature Review》 |2020年第12期|2556-2557|共2页
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Circulation

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