木星大气中交替快速环流研究

On Multiple Jet Flows In Jupiter's Atmosphere

伽利略探测器对木星深部的大气测量,进一步增加了木星大气的平均带状交替快速环流是由其深部大气运动产生的可能性,由于木星高速自转,所以此带状流的基本动力学特征是地转流,即主要动力学平衡是科里奥利力和压力.基于近两维和非轴对称地转慢波的非线性相互作用,描述了一个新的带状交替快速环流的分析理论,并给出了地转波动的一个显函数关系分析表达式,以及它对应于弱非线性问题的首阶解.对考虑非线性效应的高阶解问题,推导出了一个运动方向交替的快速环流的分析表达式.也对该理论在木星和其他行星的大气动力学研究方面作了讨论.

Measurements by the Galileo probe in the deep Jupiter's atmosphere support the possibility that mean zonal multiple-jet flows in Jupiter's atmosphere are deep rooted. As a consequence of Jupiter's high rotation rate, the primary dynamics of the zonal flows must be geostrophic, i.e., the dynamic balance is largely between the Coriolis and pressure forces. A new analytical theory for the generation of zonal multiple-jet flows on the basis of the nonlinear interaction of slowly traveling, nearly two-dimensional arid non-axisymmetric geostrophic waves is described. An explicit analytical expression for the geostrophic waves is obtained as leading-order solutions of the weakly nonlinear problem. In the high-order problem taking into account of nonlinear effects, an analytical expression for an alternating multiple-jet flow is derived. Implication of the theory for Jupiter and other planets is discussed.