Addressing Problems in Tropical Atmospheric Dynamics Using Idealized Global Climate Models

使用理想化的全球气候模型解决热带大气动力学问题

• 批准号: 2246700
• 负责人: Isaac Held
• 金额: $ 40万
• 依托单位: Princeton University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2023
• 资助国家: 美国
• 起止时间: 2023-07-01 至 2025-06-30
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2246700&HistoricalAwards=false
• 关键词: Addressing; Problems; Tropical; Atmospheric; Dynamics

A persistent gap in our knowledge of the climate system occurs in the tropical atmosphere where motions on very small spatial scales play an outsized role in the vertical transport of heat and water. These motions are very difficult to incorporate into global climate models, resulting in uncertainty in climate simulations. This project aims to advance our understanding of key fundamental features of the tropical climate and address how different modeling approaches to incorporate those motions affect these key features. The research strategy entails creating climate models of differing complexity and with realistic interaction between thermal radiation and water vapor. In these simulations, the investigators will examine the time-averaged tropical rainfall distribution and the organization of tropical rainfall on different frequencies and spatial scales, as well as the potential for abrupt reorganization of the tropical winds and rainfall as the climate warms. The research tasks will help train graduate students and early career scientists.The project follows a distinctive approach to climate theory involving the construction and analysis of a systematic hierarchy of climate models by peeling off successive layers of complexity. The examined tropical dynamics include the position and structure of the Hadley Circulation, convectively coupled waves, the Madden-Julian Oscillation, and the susceptibility of the tropics to super-rotate. Deviating from conventional wisdom, the project will initially concentrate on simulations with no additional treatment of vertical heat and moisture fluxes, supplementing what the model can produce on its own based on a horizontal resolution commonly used for climate projections. This strategy will provide a benchmark to facilitate the study of the diversity of model simulations with differing treatments of fluxes or with much smaller grid size. The project will then construct a model with greater flexibility in handling these vertical fluxes than previously possible. The hierarchy approach with accessible results can have great pedagogical values in communicating the fundamental concepts in climate theory and climate change to the public.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

我们对气候系统的了解中存在一个持续的空白，那就是热带大气中，非常小的空间尺度上的运动在热量和水的垂直输送中发挥着巨大的作用。这些运动很难纳入全球气候模型，导致气候模拟存在不确定性。该项目旨在增进我们对热带气候关键基本特征的理解，并解决纳入这些运动的不同建模方法如何影响这些关键特征。研究策略需要创建不同复杂性的气候模型以及热辐射和水蒸气之间的真实相互作用。在这些模拟中，研究人员将研究热带降雨的时间平均分布以及热带降雨在不同频率和空间尺度上的组织，以及随着气候变暖热带风和降雨突然重组的可能性。研究任务将有助于培训研究生和早期职业科学家。该项目遵循一种独特的气候理论方法，涉及通过剥离连续的复杂层来构建和分析气候模型的系统层次结构。所检查的热带动力学包括哈德利环流的位置和结构、对流耦合波、马登-朱利安振荡以及热带对超级旋转的敏感性。与传统观点不同，该项目最初将集中于模拟，而不对垂直热量和湿度通量进行额外处理，以补充模型根据气候预测常用的水平分辨率自行产生的结果。该策略将提供一个基准，以促进研究不同通量处理或小得多的网格尺寸的模型模拟的多样性。然后，该项目将构建一个模型，该模型在处理这些垂直通量方面比以前具有更大的灵活性。具有可获取结果的层次结构方法在向公众传达气候理论和气候变化的基本概念方面具有巨大的教学价值。该奖项反映了 NSF 的法定使命，并通过使用基金会的智力价值和更广泛的影响审查标准进行评估，被认为值得支持。

项目成果

Non‐Uniqueness in ITCZ Latitude Due To Radiation‐Circulation Coupling in an Idealized GCM

由于辐射导致的 ITCZ 纬度的非唯一性——理想化 GCM 中的环流耦合

• DOI: 10.1029/2023ms003736
• 发表时间: 2023
• 期刊: Journal of Advances in Modeling Earth Systems
• 影响因子: 6.8
• 作者: Zurita‐Gotor, Pablo;Held, Isaac M.;Merlis, Timothy M.;Chang, Chiung‐Yin;Hill, Spencer A.;MacDonald, Cameron G.
• 通讯作者: MacDonald, Cameron G.