Influence of cloud-radiation effects on the location of the intertropical convergence zone

云辐射效应对热带辐合带位置的影响

• 批准号: 238929428
• 负责人: Dr. Aiko Voigt
• 金额: --
• 依托单位: Institut für Meteorologie und Geophysik
• 依托单位国家: 德国
• 项目类别: Research Fellowships
• 财政年份: 2013
• 资助国家: 德国
• 起止时间: 2012-12-31 至 2013-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/238929428?language=en
• 关键词: Influence; cloud; radiation; effects; location

The intertropical convergence zone (ITCZ) is a central element of Earth's climate system. Its location determines the distribution of tropical rainfall and clouds. The ITCZ has experienced large meridional shifts in Earth's history, and will likely show such shifts in response to anthropogenic climate change. Although the ITCZ has been the subject of many studies, the role of cloud-radiative effects has received little attention. Motivated by this gap as well as recent simulations with the atmosphere model ECHAM6, the project investigates how and through which mechanisms cloud-radiative effects influence the ITCZ location. The two following questions are addressed. First, how strong is the influence of cloud-radiative effects on the ITCZ location in comparison to the wind-evaporation-sea-surface-temperature feedback? Second, do cloud-radiative effects amplify or damp meridional ITCZ shifts? These two questions are answered by the coordinated use of four different atmosphere models with interactive sea-surface temperatures. Comparing the four models provides the opportunity to separate robust from non-robust model behavior, to relate robust model behavior to physical mechanisms, and to connect non-robust model behavior to model differences in cloud-radiative effects. The project will be carried out during a 6-month visit to the Laboratoire de Meteorologie Dynamique in Paris. This will allow the applicant to closely collaborate with Dr. Sandrine Bony and Dr. Jean-Louis Dufresne, to apply the LMD atmosphere models, and to compare the LMD models to the atmosphere models of the Max Planck Institute for Meteorology, Hamburg.

热带收敛区（ITCZ）是地球气候系统的核心元素。它的位置决定了热带降雨和云的分布。 ITCZ在地球历史上经历了大量的子午转变，并且可能会显示出对人为气候变化的响应的这种转变。尽管ITCZ是许多研究的主题，但云辐射效应的作用很少受到关注。该项目是受大气模型ECHAM6的差距以及最近的模拟的动机，研究了如何以及通过哪种机制来影响云辐射效应影响ITCZ位置。以下两个问题得到了解决。首先，与风蒸发 - 表面 - 表面温度的反馈相比，云辐射影响对ITCZ位置的影响有多强？其次，云辐射效应会放大还是潮湿的子午线ITCZ移动？通过协调使用具有交互式海面温度的四个不同气氛模型的协调使用，这两个问题得到了回答。比较这四个模型提供了机会，可以将强大的强大模型行为分开，将强大的模型行为与物理机制相关联，并将非舒适模型行为与模型云辐射效应的差异相关联。该项目将在6个月的访问中对巴黎的Laboratoire de Meteorologie Dynamique进行。这将使申请人与Sandrine Bony博士和Jean-Louis Dufresne博士密切合作，应用LMD气氛模型，并将LMD模型与汉堡Max Planck气象学院的大气模型进行比较。