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.

重力波是大气系统的重要组成部分。它们影响垂直动量和能量输送，从而对大气环流起着至关重要的作用。重力波主要在对流层中激发，并通过对流层顶区域传播到高层大气。在传播过程中，它们的属性可能会改变。此外，重力波诱导高的垂直速度，从而影响对流层顶区域的冰云的形成和演变。在这个项目中，将研究重力波和冰云之间的相互作用。为此，我们将使用在MS-GWaves第一阶段开发的WKB模型。该模式将被冰云物理学扩展，并将进一步用于重力波和冰云相互作用的研究。此外，重力波引起的冰云将使用大涡模拟（LES）模型进行模拟。还将研究冰云对对流层顶动力学的非绝热效应的可能反馈。本文将用辐射传输模式研究模拟冰云（WKB或LES模式）的辐射效应。因此，我们将能够估计重力波对冰云及其辐射强迫的影响。我们还将估计冰云对对流层顶动力学的反馈，并对重力波引起的冰云的辐射强迫进行更好的估计。