Collaborative Research: An Observational and Modeling Study of Spring Onset in the Northern Hemisphere Circulation

合作研究：北半球环流春季爆发的观测和模拟研究

• 批准号: 0456157
• 负责人: Robert Black
• 金额: $ 35.26万
• 依托单位: Georgia Tech Research Corporation
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2005
• 资助国家: 美国
• 起止时间: 2005-04-15 至 2009-03-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0456157&HistoricalAwards=false
• 关键词: Collaborative; Research; Observational; Modeling; Study

The spring onset (i.e., yearly transition from winter to spring) and its interannual variability are important components of regional climate. These two features influence the hydrological cycle, through variations in clouds, sea ice, air temperature and ozone in the troposphere affecting humanity, vegetation growth, and ecosystem productivity. Recent observational studies have indicated that spring onset is strongly linked to stratospheric final warming (SFW). Past numerical studies have also indicated that the interannual variability in spring onset is strongly coupled to concomitant variations in the timing of the SFW events. The PIs' focus on SFW events provides a research setting for studying the physics and predictability of spring onset along with stratosphere-troposphere dynamical coupling that influences regional climate and its variability. Intellectual merit: The PIs will use a blend of synoptic and dynamic observational diagnoses and idealized modeling studies. First, a thorough phenomenological characterization of spring onset will be developed using observations. Then, the composite observational fields will be used to address various fundamental dynamical questions for spring onset. Guided by the phenomenological characterization and exploratory linear model calculations, several numerical experiments will be carried out to study stratosphere-troposphere coupling during spring onset. Completion of this work will offer new insights into:1. Effects of wave-mean flow interactions on the evolution of spring onset,2. Roles of the stratosphere in spring onset,3. Physical mechanisms responsible for noted changes in tropospheric climate and predictability.Broader impacts: The research provides a dynamical framework for understanding and interpreting regional climate changes associated with spring onset. It will have important implications for regional climate predictions. The research fosters collaboration between two universities and fills in gaps between tropospheric and stratospheric research communities and may lead to a comprehensive study of spring onset and its modulations by SFW events.

春天的开始（即，年冬春转换）及其年际变率是区域气候的重要组成部分。这两个特征通过云、海冰、气温和对流层臭氧的变化影响人类、植被生长和生态系统生产力，从而影响水文循环。最近的观测研究表明，春季开始与平流层最终变暖（SFW）密切相关。过去的数值研究也表明，在春季开始的年际变化强烈耦合到伴随的SFW事件的时间变化。PI对SFW事件的关注为研究春季开始的物理学和可预测性沿着影响区域气候及其变化的平流层-对流层动力学耦合提供了研究环境。智力价值：PI将使用天气和动力观测诊断和理想化建模研究的混合。首先，一个彻底的现象学特征的春天开始将开发使用的观察。然后，复合观测场将被用来解决春季开始的各种基本动力学问题。在现象学特征和探索性线性模式计算的指导下，将进行几个数值试验来研究春季开始期间的平流层-对流层耦合。这项工作的完成将提供新的见解：1。波浪-平均流相互作用对春季发生发展的影响。平流层在春季发生中的作用，3.更广泛的影响：这项研究为理解和解释与春季开始相关的区域气候变化提供了一个动力学框架。 它将对区域气候预测产生重要影响。 这项研究促进了两所大学之间的合作，填补了对流层和平流层研究界之间的空白，并可能导致对春季开始及其受SFW事件调制的全面研究。