Material transports associated with large-scale waves and their seasonal and interannual variations

与大规模波浪相关的物质输送及其季节和年际变化

• 批准号: 11219203
• 负责人: YODEN Shigeo
• 金额: $ 31.23万
• 依托单位: Kyoto University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research on Priority Areas
• 财政年份: 1999
• 资助国家: 日本
• 起止时间: 1999 至 2002
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-11219203/
• 关键词: large-scale atmospheric waves; material transport; interannual variation; planetary waves; baroclinic waves; gravity waves; equatorial OBO; stratospheric sudden warming; 地球流体モデル; 赤道波; 浅水系モデル; 季節内変動; 球面浅水スペクトルモデル; 中間規模波

Nonlinear behaviors of large-scale atmospheric waves in the troposphere and the stratosphere were investigated with a hierarchy of numerical models, which we have been developed and used. Material transport processes associated with these waves were also studied with some tracer models. Seasonal dependence, interannual variations, and trends of the wave behaviors were also clarified by analyzing long records of numerical time-integrations and global observation data.1. Model development : A numerical library to solve geophysical fluid motions in some typical geometries efficiently in supercomputers has been developed. As application tests of the models, 2-D decaying turbulence on a rotating sphere and gravity wave radiation in a rotating shallow water system are investigated.2. Planetary waves : A global circulation model with simplified physical processes was used to investigate the effects of the equatorial QBO winds on planetary waves and mean meridional circulation in the winter he … More misphere. It was demonstrated that large sample method based on long enough data is a powerful tool to show the statistical significance of the QBO effects. In order to study horizontal mixing and transport barrier in winter stratosphere, assimilated data for 9 years from 1990 were used to do local Lyapunov stability analysis and compute Lagrange trajectories of many particles. Interannual variations of the mixing were quantified with these analyzes.3. Baroclinic waves : Long time integrations of an atmospheric GCM were done with an idealized SST to investigate the dynamics of localized storm tracks. It was found that the most important factor to determine the localization is nonzonal (west-east) component of the meridional gradient of SST in mid-latitudes.4. Equatorial gravity waves : Generation, propagation and breaking processes of convectively generated gravity waves were firstly simulated with a meso-scale non-hydrostatic numerical model from the surface to the lower thermosphere (about 100 km height). An estimation method of convectively generated waves in the equatorial region based on satellite observations of IR radiation was developed and tested. Less

本文用一系列数值模式研究了对流层和平流层大尺度大气波动的非线性行为。与这些波相关的物质输运过程也用一些示踪剂模型进行了研究。通过分析数值积分的长记录和全球观测资料，也阐明了波浪行为的季节依赖性、年际变化和趋势。模型开发：建立了一个在超级计算机上高效求解几种典型几何条件下地球物理流体运动的数值库。作为模型的应用试验，本文研究了旋转球上二维衰减湍流和旋转浅水系统中重力波辐射.行星波：利用一个简化的全球环流模式，研究了赤道准两年振荡风对冬季行星波和平均纬向环流的影响。 ...更多信息 错意结果表明，基于足够长数据的大样本方法是显示QBO效应统计显著性的有力工具。为了研究冬季平流层的水平混合和输送障碍，利用1990年以来9年的同化资料，对多个粒子进行了局域李雅普诺夫稳定性分析和拉格朗日轨迹计算。利用这些分析定量分析了混合的年际变化.斜压波：大气GCM的长时间积分与理想化SST一起完成，以研究局部风暴路径的动力学。研究发现，决定中纬度海温纬向梯度的非纬向（东西向）分量是决定海温局部化的最重要因素。赤道重力波：利用中尺度非静力数值模式首次模拟了对流产生的重力波从地面到低热层（约100 km高度）的产生、传播和破碎过程。根据卫星对红外辐射的观测，开发并检验了一种估算赤道地区对流生成波的方法。少

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