| 项目编号: | 1657921
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| 项目名称: | Collaborative Research: Structure and Influence of Coherent Vertical Pulses of Wave Activity Flux in Observations and Models, from Daily to Seasonal Timescales |
| 作者: | Mathew Barlow
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| 承担单位: | University of Massachusetts Lowell
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| 批准年: | 2017
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| 开始日期: | 2017-08-15
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| 结束日期: | 2020-07-31
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| 资助金额: | 215877
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| 资助来源: | US-NSF
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| 项目类别: | Standard Grant
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| 国家: | US
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| 语种: | 英语
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| 特色学科分类: | Geosciences - Atmospheric and Geospace Sciences
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| 英文关键词: | change
; pulse event
; wave activity flux
; vertical pulse
; spatial structure
; observational datum
; weather forecast model
; interaction
; event
; hemispheric influence
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| 英文摘要: | The stratosphere, an atmospheric layer about 8-10 km above the surface, can influence winter weather over the Northern Hemisphere via its interactions with the troposphere beneath. These interactions can take several weeks to develop and mature, and may provide information about changes to weather patterns two to six weeks in advance, particularly during the fall and winter. An important starting point for some of these interactions is a change in the tropospheric winds over Northern Eurasia that occurs over a relatively short period, generally less than two weeks. This change in winds is associated with the "vertical pulses of wave activity flux", which can influence the polar stratosphere and, eventually, surface weather. This research aims to provide a comprehensive understanding of these short-term "pulse events" and their hemispheric influence by examining the spatial structure and temporal evolution of the events and investigating their role in the initiation of slower troposphere-stratosphere interactions that end up resulting in changes to weather over regions remote from the pulses, including over parts of North America, Europe, and Asia. This improved understanding will also provide an evaluation of the potential for considering these pulse events in the prediction of some aspects of weather variability up to several weeks in advance. The events will be studied using observational data for examining their structure and investigating their underlying physical mechanisms, and also using the output of weather forecast models to assess how realistically models are able to reproduce these events and their influence.
This investigation will provide a better understanding of how the troposphere and stratosphere interact and of one of the causes of variations in winter weather. The project will also educate and train graduate students and include public outreach and education through development of a teaching portal, student presentation of tutorials through social media, and provision of an experimental forecast. |
| 资源类型: | 项目
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/89297
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| Appears in Collections: | 全球变化的国际研究计划
科学计划与规划
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| Recommended Citation: | |
Mathew Barlow. Collaborative Research: Structure and Influence of Coherent Vertical Pulses of Wave Activity Flux in Observations and Models, from Daily to Seasonal Timescales. 2017-01-01.
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