The role of Rossby waves in decaying turbulent motion on a rotating sphere : an insight on zonal wind distributions of planetary atmospheres.

本文研究了旋转球壳上二维非发散流动的特性。我们期望获得一些关于在真实的地球和/或行星大气中观测到的纬向流分布的见解。我们的目的也包括，在同一时间，开发一个合适的计算和/或信息环境，以追求我们的科学目标。东京大学和九州大学的小组之间通过Internet开发公共软件资源和环境的实验揭示了几个致命的问题，我们的程序结构需要改进。在我们开发的软件资源中存在大量开销问题。以开发包含高维模式（浅水模式和三维球形对流模式）的结构化软件为目标的活动，在不太令人满意的阶段完成。然而，通过互联网进行的协作实验取得了良好的效果，部分原因是 ...更多信息 本文通过数值方法的二维球面试验验证了Rossby波在高纬度地区被吸收并向东存款角动量的设想是可以接受的。弱非线性实验中的非线性项仅限于弱相互作用引起的纬向加速度，证实了弱非线性理论所描述的加速机制。然而，我们不能给出象WKB理论所期望的那样，波包被临界纬度吸收的很有说服力的例子。三维球面实验表明，由热对流引起的赤道纬向加速度也可以用由球面几何约束产生的Rossby波动力学来解释。我们成功地分类的东西向加速度，由于对流运动的Rossby波存在。少

The purpose of this study was to investigate the behavior oftwo-dimensional non-divergent flow on a rotating spherical shell. We expected to obtain some insight on the distribution of zonal flowsobserved in the real earth and/or planetary atmospheres. Our purpose also contained, in the mean time, developing a suitable computation and/or information environment for pursuing our scientific object.The experiment of developing common software resources and environment between the groups of University Tokyo and Kyushu University via Internet revealed several fatal issues to be improved in our program structures. There were heavy overhead problems in our developed software resources. The activity aiming at developing a structured software including high dimensional models, that is, the shallow water model and three dimensional spherical convection model, finished with not very satisfying stage. However, the collaboration experiment via Internet was carried out with good performance, partly o … More wing to the eatablishment of SINET.The computer communication between the workstations of Tokyo and Kyushu presented good environment for destant collaboration.The two-dimensional spherical experiment with numerical method verified that the scenario in which Rossby waves are absorbed in the higher latitudes and deposit eastward angular momentum there was acceptable. The weak non-linear experiments in which the non-linear terms were restricted only to the zonal acceleration due to weak interaction confirmed that the acceleration mechanism was that described by weak non-linear theory. However, we couold not produce very convincing example where a wave packet was absorbed by the critical latitude as was expected by WKB theory. The resolution used in the experiment seemed to be insufficient in obtaining such results.The three dimentional spherical experiments showed that the equatorial zonal acceleration obtained by thermal convection is also explained by the dynamics of Rossby waves which emerge from the two dimensional constraint forced by the spherical geometry. We succeeded in classifying the east-west acceleration due to convective motion by the use of Rossby waves existing there. Less