Gravity-waves impact on ice clouds in the tropopause region (GW-ICE)

重力波对对流层顶区域冰云的影响（GW-ICE）

• 批准号: 258696869
• 负责人: Professor Dr. Ulrich Achatz
• 金额: --
• 依托单位: Institut für Physik der Atmosphäre
• 依托单位国家: 德国
• 项目类别: Research Units
• 财政年份: 2014
• 资助国家: 德国
• 起止时间: 2013-12-31 至 2023-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/258696869?language=en
• 关键词: Gravity; waves; impact; ice; clouds

Gravity waves constitute an important component of the atmosphere system. They influence the vertical momentum and energy transport and thus contribute crucially to circulations in the atmosphere. Gravity waves are excited mostly in the troposphere and propagate through the tropopause region into the higher atmosphere. During the propagation their properties might be changed. Additionally, gravity waves induce high vertical velocities and therefore influence the formation and evolution of ice clouds in the tropopause region. In this project the interaction between gravity waves and ice clouds will be investigated. For this purpose we will use the WKB model, which was developed in the first phase of MS-GWaves. This model will be extended by ice cloud physics and further will be used for the investigation of interactions of gravity waves and ice clouds. Additionally, gravity wave-induced ice clouds will be simulated using a large eddy simulation (LES) model. Possible feedbacks of ice clouds to tropopause dynamics by diabatic effects will also be investigated. The radiative effect of simualted ice clouds (WKB or LES model) will be investigated using a radiative transfer model. Thus, we will be able to estimate the impact of gravity waves on ice clouds and their radiative forcing. We will also estimate feedbacks of ice clouds to tropopause dynamics and will give a better estimate of the radiative forcing of gravity wave-induced ice clouds.

重力波构成大气系统的重要组成部分。它们影响垂直动量和能量传输，从而对大气中的循环产生至关重要的贡献。重力波主要在对流层中激发，并通过对流层顶区域传播到更高的气氛中。在传播过程中，它们的性质可能会更改。此外，重力波诱导高垂直速度，因此影响对流层顶区域中冰云的形成和演变。在这个项目中，将研究重力波和冰云之间的相互作用。为此，我们将使用WKB模型，该模型是在MS-Gwaves的第一阶段开发的。该模型将通过冰云物理学扩展，并将进一步用于研究重力波和冰云的相互作用。另外，将使用大型涡流模拟（LES）模型模拟​​重力波诱导的冰云。还将研究冰云对对流层顶动力学的反馈。将使用辐射转移模型研究类似冰云（WKB或LES模型）的辐射效应。因此，我们将能够估计重力波对冰云的影响及其辐射强迫。我们还将估算冰云的反馈对对流层泊动力学的反馈，并可以更好地估计重力波诱导的冰云的辐射强迫。