Global S&T Development Trend Analysis Platform of Resources and Environment
项目编号 | 1832842 |
Quantifying Transport and Mixing in the Stratosphere and Upper Troposphere | |
Gang Chen | |
主持机构 | University of California-Los Angeles |
项目开始年 | 2018 |
2018-09-01 | |
项目结束日期 | 2021-08-31 |
资助机构 | US-NSF |
项目类别 | Standard Grant |
项目经费 | 596513(USD) |
国家 | 美国 |
语种 | 英语 |
英文摘要 | This research project will help improve the understanding of the dynamics and predictability of nonlinear processes during a breakdown of polar vortex in the stratosphere, responsible for extreme cold outbreak events in the late winter and early spring. This study may also shed light on processes responsible for transport and mixing across the edge of polar vortex in a changing climate. In the upper troposphere, this is relevant for atmospheric rivers, blocking, and other type of extreme weather that has important societal impacts. The outcome of the research project is expected to have broad implications across a very wide range of fluid flow problems and generate more dialogues between the theory of dynamical systems and applications to atmospheric and oceanic fluids. One graduate student at UCLA will be trained in analysis of observational data and the use of idealized and comprehensive models of the atmosphere. Several undergraduates will be trained in data analysis of atmospheric circulation. The extratropical atmosphere is characterized by the westerly circumpolar flow, with the polar vortex in the stratosphere and the subtropical jet stream in the upper troposphere. Variations in the stratospheric polar vortex and tropospheric jet stream are critical for the dynamics, chemistry, and predictability of these regions. Increases in the amplitude of planetary-scale Rossby waves in the stratosphere interrupt the westerly circumpolar flow, resulting a stronger transport of warm air mass into the polar stratosphere and leading to a sudden warming there. The stronger transport of ozone during a stratospheric sudden warming event helps prevent a continuous loss of ozone over the polar regions during dark winter there. Similarly, the blocked westerly flow in the upper troposphere can impact the transport of energy, momentum as well as water vapor. There is still a lack of understanding about the nonlinear nature of the flow in the presence of large amplitude waves, which limits our ability to predict these events. The objective of this project is to gain new knowledge on the fundamental processes at work for the Lagrangian transport (following the motion of air parcel) in the westerly flow from the dynamical systems point of view in conjunction with the theory of transport and mixing in the atmosphere. More specially, stratospheric warming events will be characterized by the Lagrangian descriptor, a metric stemmed from the dynamical systems, in observations and idealized models of stratosphere-troposphere coupling. The observed patterns will be compared with transport and mixing in a comprehensive chemistry-climate model and chemical compositions in satellite observations at different time scales. 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. |
文献类型 | 项目 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/73374 |
专题 | 环境与发展全球科技态势 |
推荐引用方式 GB/T 7714 | Gang Chen.Quantifying Transport and Mixing in the Stratosphere and Upper Troposphere.2018. |
条目包含的文件 | 条目无相关文件。 |
个性服务 |
推荐该条目 |
保存到收藏夹 |
查看访问统计 |
导出为Endnote文件 |
谷歌学术 |
谷歌学术中相似的文章 |
[Gang Chen]的文章 |
百度学术 |
百度学术中相似的文章 |
[Gang Chen]的文章 |
必应学术 |
必应学术中相似的文章 |
[Gang Chen]的文章 |
相关权益政策 |
暂无数据 |
收藏/分享 |
除非特别说明,本系统中所有内容都受版权保护,并保留所有权利。
修改评论