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首页> 外文期刊>Journal of the Atmospheric Sciences >WESTWARD PROPAGATION OF LATITUDINAL ASYMMETRY IN A COUPLED OCEAN-ATMOSPHERE MODEL
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WESTWARD PROPAGATION OF LATITUDINAL ASYMMETRY IN A COUPLED OCEAN-ATMOSPHERE MODEL

机译：海洋-大气耦合模型中纬向不对称向西传播

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Hemispheric asymmetries of continental geometry have long been speculated to be the cause of the Northern Hemisphere position of the intertropical convergence zone over the central and eastern Pacific. It is unknown, however, how the effects of continental asymmetries are transmitted to and felt by the central pacific thousands of kilometers away. This paper proposes a transmitter mechanism by investigating the response of a coupled ocean-atmosphere model to a symmetry-breaking force by the American continents. The model treats land forcing implicitly as an eastern boundary condition. In the absence of oceanic feedback, the model response to the eastern boundary forcing is tightly trapped and confined to a small longitudinal extent off the coast, whereas the climate over the interior ocean is symmetric about the equator. Ocean-atmosphere coupling greatly enhances the transmissibility of the effects of the land forcing. establishing large latitudinal asymmetry over a great zonal extent. A westward propagating coupled instability is found to be responsible, which is antisymmetric about the equator and is caused by a wind-evaporation-SST feedback proposed previously by Xie and Philander. The solution to an initial value problem shows that a coupled ocean-atmosphere wave front generated by the land forcing amplifies as it moves westward, leaving behind a latitudinally asymmetric steady state. [References: 25]
机译：长期以来，人们一直认为大陆几何体的半球不对称是造成中太平洋和东部太平洋热带辐合带北半球位置的原因。然而，未知的是，大陆非对称性的影响如何传播到数千公里外的中太平洋并由中太平洋感受到。通过研究海洋-大气耦合模型对美洲大陆对称破坏力的响应，提出了一种发射器机制。该模型将土地强迫隐含为东部边界条件。在没有海洋反馈的情况下，模型对东部边界强迫的响应被严格限制并限制在离海岸很小的纵向范围内，而内部海洋的气候则相对于赤道对称。海洋与大气的耦合极大地增强了陆地强迫效应的可传递性。在很大的区域范围内建立了较大的纬向不对称性。发现向西传播的耦合不稳定性是造成这种情况的原因，它与赤道成反对称，并且是由谢和菲兰德先前提出的风蒸发-SST反馈引起的。初始值问题的解决方案表明，随着陆地向西移动，由陆地强迫产生的耦合的海洋-大气波前波放大了，留下了横向不对称的稳态。 [参考：25]

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