Gravity wave Ray tracing Parameterization and its Effects in Solar cycle modeling (GRAPES)

重力波射线追踪参数化及其对太阳周期建模的影响（GRAPES）

• 批准号: 128797829
• 负责人: Dr. Peter Preuße
• 金额: --
• 依托单位: IEK-7: Stratosphäre
• 依托单位国家: 德国
• 项目类别: Priority Programmes
• 财政年份: 2009
• 资助国家: 德国
• 起止时间: 2008-12-31 至 2012-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/128797829?language=en
• 关键词: Gravity; wave; Ray; tracing; Parameterization

Long term runs of general circulation modeling rely on column-based gravity wave parameterizations, i.e. gravity waves are assumed to propagate only vertically. However, using global ray tracing experiments we showed that there are substantial differences in the zonal mean accelerations of the background wind due to oblique propagation of gravity waves. In particular, the meridional acceleration is primarily caused by the spatial separation of waves part of them propagating northward and part southward (which would not happen in a column-based parameterization) and waves driving the mid-latitude mesosphere origin to a larger fraction from lower latitudes. These results are based on offline studies using a prescribed background atmosphere and a launch distribution tuned by satellite observations. We propose now to investigate these effects in a coupled GCM study. We will develop a ray tracing gravity wave parameterization based on the GROGRAT ray tracer. The launch distribution of the new scheme will be guided by satellite, ground-based and in-situ observations. Tuning in the GCM will nevertheless be necessary. The parameterization will be integrated in the ROSE model and simulations for different solar cycle conditions will be performed. Runs with purely vertical and oblique wave propagation will be compared in order to quantify the effects of oblique wave propagation on the atmospheric response to different solar activity.

大气环流模拟的长期运行依赖于基于柱的重力波参数化，即假设重力波仅垂直传播。然而，使用全球射线追踪实验，我们表明，有实质性的差异，由于重力波的斜传播的背景风的纬向平均加速度。特别是，纬向加速度主要是由波的空间分离引起的，其中一部分向北传播，一部分向南传播（这在基于列的参数化中不会发生），而波将中纬度中间层起源驱动到低纬度的更大部分。这些结果是基于离线研究，使用规定的背景大气和卫星观测调整的发射分布。我们现在建议在耦合GCM研究中调查这些影响。我们将开发一个基于GROGRAT射线追踪的重力波参数化射线追踪。新计划的发射分布将以卫星、地面和现场观测为指导。然而，调整大气环流模式是必要的。参数化将被纳入ROSE模型，并将对不同的太阳周期条件进行模拟。将比较纯垂直波传播和斜波传播对大气的影响，以便量化斜波传播对不同太阳活动的大气响应的影响。