| 项目编号: | 1624414
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| 项目名称: | Effects of Saharan Dust on the African Easterly Jet-African Easterly Wave System |
| 作者: | Terrence Nathan
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| 承担单位: | University of California-Davis
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| 批准年: | 2017
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| 开始日期: | 2017-03-01
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| 结束日期: | 2020-02-29
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| 资助金额: | 598580
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| 资助来源: | US-NSF
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| 项目类别: | Continuing 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: | saharan dust
; easterly wave
; system
; african easterly jet african easterly wave system
; strong easterly wind
; dust-modified
; african easterly jet
; effect
; north africa
; dust-modified physics operating
; complex system
; tropical cyclone
; dust-modified circulation
; heating effect
; weather
; dust-modified system
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| 英文摘要: | North Africa is home to the African easterly jet, a current of strong easterly winds located in the lower atmosphere. The African easterly jet often gives birth to weather systems known as African easterly waves. Together the jet and the waves form a complex system whose influence on weather can extend to the United States. That influence often manifests as tropical cyclones, whose genesis has been linked to the easterly waves. Consequently, to understand the connection between the weather over North Africa and the development of tropical cyclones, it is important to understand the processes that affect the African easterly jet‒African easterly wave system. Of those processes, the heating effects of Saharan dust storms are among the least understood, yet potentially among the most important. The central objective of this proposal is to advance understanding of the effects of Saharan dust storms on the intra-seasonal and inter-annual variability of the African easterly jet‒African easterly wave system. To achieve this objective, a unified work plan is developed that combines numerical experiments, observational analysis, and model verification. To guide the numerical experiments and to aid in the interpretation of the results, a theoretical framework will be developed that exposes the dust-modified physics operating within the system.
The scientific merits of the proposed research include: understanding the pathways that communicate the effects of Saharan dust to the African easterly jet‒African easterly wave system; providing a physical basis for explaining how Saharan dust affects the temporal variability of the system; and evaluating the importance of Saharan dust to the life cycles of the easterly waves. The broader impacts of the proposed research include: additional understanding of how Saharan dust affects the circulation over North Africa, which will aid the scientific community?s efforts to improve weather forecasts for the region; improved representation of the dust-modified system, which will benefit future studies that seek to advance understanding and improve forecasting of tropical cyclones over the Eastern Atlantic Ocean; development of a theoretical framework for understanding the dust-modified circulation, which can be used as an interpretive tool for numerical modeling and observational studies of the weather over North Africa; and the scientific training of undergraduate and graduate students in the discipline of atmospheric sciences. |
| 资源类型: | 项目
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/90486
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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: | |
Terrence Nathan. Effects of Saharan Dust on the African Easterly Jet-African Easterly Wave System. 2017-01-01.
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