| 项目编号: | 1624316
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| 项目名称: | AGS-PRF: Antecedent Remote and Local Synoptic Environments Most Conducive to North American Polar/Subtropical Jet Superpositions |
| 作者: | Andrew Winters
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| 承担单位: | Winters Andrew C
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| 批准年: | 2017
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| 开始日期: | 2017-07-01
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| 结束日期: | 2019-06-30
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| 资助金额: | 86000
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| 资助来源: | US-NSF
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| 项目类别: | Fellowship
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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: | jet superposition event
; environmental discriminator
; main jet stream
; polar jet stream
; polar jet
; jet stream
; distinct jet stream
; jet stream superposition
; subtropical jet stream
; jet superposition
; local synoptic environment
; subtropical jet
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| 英文摘要: | The jet stream is a well-known atmospheric phenomena, but the public is generally unaware that there are two main jet streams in each hemisphere, the polar jet stream and the subtropical jet stream. These jets are typically separated by a significant distance, but in certain circumstances can end up in the same geographic location, known as a jet stream superposition. These superposition occurrences can be tied to very high-impact weather events, so learning more about their causes and characteristics is important for improving weather forecasts. The researcher funded under this award will use 35 years of atmospheric data to identify, classify, and analyze an estimated 700 superposition events over North America. The main societal impact will be the development and testing of an operational forecast product that would provide a first alert to high-impact weather events in the 8-10 day forecast range. The early career researcher also plans to continue his education and outreach activities by mentoring an undergraduate student and communicating scientific results to the public.
The researcher plans to study the topic of jet superposition events, wherein the polar jet and the subtropical jet meet in a vertical superposition of initially distinct jet streams. The NCEP CFSR dataset will be used to identify superposition events over North America and then various analyses will be run to answer the following research questions: 1) What is the nature of the large-scale interactions between polar cyclonic and tropical anticyclonic PV anomalies throughout the production of a jet superposition and does the polar or tropical component consistently dominate those interactions? 2) What are the antecedent remote and local synoptic environments that are most conducive to the production of a superposition for each type of PV anomaly interaction and what influence does a superposition have on the downstream midlatitude flow pattern? 3) What environmental discriminators exist between jet superposition events and "null cases", or instances in which the PJ and STJ closely approach one another but do not superpose, for each type of PV anomaly interaction? |
| 资源类型: | 项目
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/89771
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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: | |
Andrew Winters. AGS-PRF: Antecedent Remote and Local Synoptic Environments Most Conducive to North American Polar/Subtropical Jet Superpositions. 2017-01-01.
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