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首页> 外文期刊>Journal of the Atmospheric Sciences >Barotropic instability and equatorial superrotation
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Barotropic instability and equatorial superrotation

机译：正压不稳定性和赤道超旋转

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Baroclinically unstable zones in midlatitudes normally produce medium-scale planetary waves that propagate toward the equator where they generate easterlies while transferring westerly momentum poleward, so that the jet lies in higher latitudes than in the corresponding axisymmetric (eddy-free) state. When the baroclinically unstable zone is moved into low latitudes, however, the equatorward side of the jet can also produce a barotropic instability whose large-scale eddies lead to a strong superrotating westerly current at the equator; the jet remains close to its axisymmetric location. For the earth, the transition between these two regimes occurs when the jet lies close to 30degrees, according to calculations with a global, multilevel, spectral, primitive equation model that examines superrotating flows for a wide range of rotation rates. The existence of a stable superrotating regime implies that an alternative climate could occur, but only under novel conditions. [References: 13]
机译：中纬度的斜压不稳定区通常会产生向赤道传播的中等规模的行星波，在那里它们会产生东风，同时向西传递动量动量，因此射流所处的纬度要比相应的轴对称（无涡流）状态高。但是，当斜压不稳定区移动到低纬度时，射流的赤道侧也会产生正压不稳定性，其大涡流会导致赤道处强烈的超旋转西风。射流仍然靠近其轴对称位置。对于地球而言，根据全局，多级，光谱，原始方程模型的计算，当喷射流接近30度时，会在这两种状态之间发生过渡，该模型检查了各种转速下的超旋转流。稳定的超旋转机制的存在意味着可能会出现替代气候，但只能在新的条件下发生。 [参考：13]

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