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Theoretical and numerical study on Jovian atmospheres:their dynamics, matetialtrensport, and energetics.

木星大气的理论和数值研究：它们的动力学、物质运动和能量学。

基本信息

批准号：
16204036
负责人：
HAYASHI Yoshi-yuki
金额：
$ 29.37万
依托单位：
Kobe University (2007)Hokkaido University (2004-2006)
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (A)
财政年份：
2004
资助国家：
日本
起止时间：
2004 至 2007
项目状态：
已结题

项目摘要

For the purpose of investigating the interplay among dynamical, thermal, and compositional structures of the atmospheres of Jovian planets, we compiled the current status of corresponding knowledge, developed a hierarchical modeling system, and conducted numerical experiments with those hierardical modeling systems. The main findings of our investigations are summarized as follows:1. We developed a vertical one-dimensional equilibrium cloud condensation model, which enable us to cover possible atmospheric compositional varieties of the Jovian planets. We found that the contributions to the intensity of stability by the cloud layers associated with the condensation of NH_3 and formation of NH_4SH are not negligible compared with that of H_2O.2. We developed a two-dimensional cloud convection model incorporating the condensation of NH_3 and H_2O and formation of NH_4SH. We conducted a series of numerical experiments, and found that the H_2O condensation level acts as a distinct dynamical … More boundary that separates the convective motions above and below it. The stable layers due to NH_3 and NH_4SH clouds cannot suppress the cloudy plumes driven by H_2O condensation healing, resulting in the mixing over the full depth of the atmosphere above the H_2O condensation level.3. With the application to the Jovian atmosphere in mind, we performed a series of numerical studies on the equatorial acceleration using the three dimensional Bousinesq spherical shell convection model. We found that a strong stable layer in the outer layer helps the development of equatorial retrograde jet. This result may raise a question about the theory where rotating spherical thermal convection explains the cause of the equatorial westerly jets of Jupiter and Saturn.4. A common software infrastructure, over which those numerical models were constructed, was developed. It contains "gt4f90io" which is a library for I/O of numerical data, and "Rdoc" which is an automatic documentation generator for numerical model codes. We also organized a standard style of Fortran90 programming and constructed a library of Fortran90 functions for basic mathematical manipulations, with which we developed 'Spmodel" which is a set of spectral models. All of the softwares mentioned are open to public on our web site. Less

为了研究类木行星大气的动力学、热力学和成分结构之间的相互作用，我们整理了相应知识的现状，开发了一个分层模型系统，并使用这些分层模型系统进行了数值实验。本研究的主要发现归纳如下：1.我们开发了一个垂直一维平衡云凝结模型，使我们能够覆盖可能的木星行星的大气成分品种。我们发现，与H_2O相比，与NH_3的凝结和NH_4SH的形成有关的云层对稳定性强度的贡献是不可忽略的。本文发展了一个考虑NH_3和H_2O凝结及NH_4SH生成的二维云对流模式。我们进行了一系列的数值实验，发现H_2O凝结水平是一个明显的动力学过程 ...更多信息由NH_3和NH_4SH云形成的稳定层不能抑制由H_2O凝结愈合驱动的云羽，导致H_2O凝结层以上的大气全层混合.考虑到木星大气的应用，我们用三维Bousinesq球壳对流模型对赤道加速度进行了一系列的数值研究。我们发现，赤道逆行急流的发展与赤道大气层外稳定层的存在有关。这一结果可能对旋转球形热对流解释木星和土星赤道西风急流的理论提出疑问。开发了一个共同的软件基础设施，在此基础上构建了这些数字模型。它包含“gt 4f 90 io”，这是一个用于数值数据I/O的库，以及“Rdoc”，这是一个用于数值模型代码的自动文档生成器。我们还组织了一个标准风格的Fortran 90编程，并构建了一个库的Fortran 90函数的基本数学操作，我们开发了“Spmodel”，这是一组光谱模型。所有提到的软件都在我们的网站上向公众开放。少