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(负面)风应力旋度是什么?

我现在在学校做研究的一篇论文,我们需要研究university-like水平。当我看报纸原因和影响的2014年东北太平洋温暖异常我发现这个句子:

优先级的风应力旋度是负数,但仍然相当不寻常的。

风应力旋度是-0.5美元* 10 ^ 6 \ \文字{N} * m ^ {3} $。我不知道风应力旋度是,负号是什么,它的单位所描述(当然,每米的压力,但是这是什么意思?)。

谁能解释这是什么吗?

回答

略读文章,我相信风应力旋度的相关性是其“埃克曼泵”的关系。我还没有找到一个简单,简洁的引用,但(这一页)[1]可能是一个好的开始,和(这一页)[2]的风应力旋度公式。我会尽量总结。当风吹过水,水的顶部开始移动。它下面剪兑水,所以水开始移动。风的动能转移到较低的层的水。这水也觉得科里奥利力。它最终移动的方向取决于摩擦/阻力和科里奥利力的平衡。平均风的水右移在北半球;如果风吹向北,水向东移动。 Now imagine you have strong wind blowing northward at one location and weaker wind to the right of it. The water at the first location moves to the right, and it does so faster than the water at the second location (because the wind forcing the water is stronger at the first location). The water converges at the second location, pushing the water downward. This is how the curl of the wind stress (the northward wind changing in the east-west direction) is related to the water convergence (the eastward current changing in the east-west direction) and hence to water being pushed down or pulled up. Positive wind stress curl pulls water up; negative wind stress curl pushes it down. The last relevant part here is that this kind of motion suppresses ocean mixing. The relevant sentence from that paper is > The wind stress curl and hence Ekman pumping anomalies were negative, which also is consistent with relatively weak entrainment. "Entrainment" is how much of the deep, cold ocean water mixes with the relatively warm upper ocean water, cooling it. The negative wind stress curl leads to water being pushed down and less deep water mixing with the upper ocean. The upper ocean stayed warmer, so the whole heat blob lasted longer. [1]: http://paoc.mit.edu/labguide/ekpump.html [2]: https://marine.rutgers.edu/dmcs/ms501/2004/Notes/Wilkin20041028.htm

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