Middle atmosphere effects of localized gravity wave forcing

局域重力波强迫的中层大气效应

• 批准号: 282130462
• 负责人: Professor Dr. Christoph Jacobi
• 金额: --
• 依托单位: Institut für Meteorologie
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2016
• 资助国家: 德国
• 起止时间: 2015-12-31 至 2019-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/282130462?language=en
• 关键词: Middle; atmosphere; effects; localized; gravity

The project involves a study of the middle atmosphere effects of localized internal gravity wave (IGW) forcing. Characteristics of the higher IGW activity regions, their spatial and temporal variability and links to other climate factors will be studied using GPS radio occultations. We will implement algorithms for full 3D diagnostics of the wave forcing and Brewer-Dobson circulation (BDC). The diagnostics will be applied along with numerical simulations of a mechanistic circulation model and reanalysis data in order to specify the BDC longitudinal variability and the role of the localized IGW forcing. In the next step, we will study the generation and propagation directions of planetary waves forced by the localized IGW forcing. Implications for the polar regions (circulation perturbations, winter preconditioning, sudden stratospheric warming characteristics), equatorial stratosphere (tropopause folds links, influence on the exchange with the troposphere) and mesosphere will be studied using the numerical simulations. The results will be evaluated in the context of the global middle atmospheric mean circulation and its variability.

该项目涉及对局部内部重力波强迫的中层大气影响的研究。将利用全球定位系统无线电掩星来研究地球同步带高活动区域的特征、其空间和时间变化以及与其他气候因素的联系。我们将实施全三维诊断波强迫和布鲁尔-多布森环流（BDC）的算法。诊断将应用沿着的机械环流模式和再分析数据的数值模拟，以指定BDC的纵向变化和本地IGW强迫的作用。在下一步中，我们将研究由局部IGW强迫产生的行星波的产生和传播方向。将利用数值模拟研究对极地地区（环流扰动、冬季预处理、平流层突然变暖的特征）、赤道平流层（对流层顶褶皱联系、对与对流层交换的影响）和中间层的影响。将在全球中层大气平均环流及其变化的背景下对结果进行评价。

项目成果

Impact of local gravity wave forcing in the lower stratosphere on the polar vortex stability: effect of longitudinal displacement

• DOI: 10.5194/angeo-38-95-2020
• 发表时间: 2019-08
• 期刊: Annales Geophysicae
• 影响因子: 1.9
• 作者: N. Samtleben;A. Kuchař;P. Šácha;P. Pišoft;C. Jacobi

Effect of latitudinally displaced gravity wave forcing in the lower stratosphere on the polar vortex stability

• DOI: 10.5194/angeo-37-507-2019
• 发表时间: 2019-01
• 期刊: Annales Geophysicae
• 影响因子: 1.9
• 作者: N. Samtleben;C. Jacobi;P. Pišoft;P. Šácha;A. Kuchař