| DOI: | 10.1002/2016JD025721
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| 论文题名: | Characterizing extreme and oppressive heat waves in Illinois |
| 作者: | Ford T.W.; Schoof J.T.
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| 刊名: | Journal of Geophysical Research: Atmospheres
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| ISSN: | 2169897X
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| 出版年: | 2017
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| 卷: | 122, 期:2 | | 起始页码: | 682
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| 结束页码: | 698
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| 语种: | 英语
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| 英文关键词: | extreme heat
; Illinois
; oppressive heat
; self-organizing maps
; synoptic-scale patterns
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| Scopus关键词: | artificial neural network
; atmospheric circulation
; atmospheric moisture
; boundary layer
; evapotranspiration
; extreme event
; heat wave
; relative humidity
; synoptic meteorology
; variance analysis
; Illinois
; Midwest
; United States
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| 英文摘要: | Heat waves are characteristic features of summertime climate in the Midwest United States and can have significant agricultural, hydrological, and societal impacts. Historically, heat waves in the Midwest state of Illinois have been either extreme (high temperature and low humidity) or oppressive (high temperature and high humidity) in nature, but our knowledge of the factors determining which heat wave type occurs is limited. We use self-organizing maps to classify synoptic-scale atmospheric circulation patterns associated with oppressive and extreme heat events and analysis of variance to evaluate the atmospheric and land surface features responsible for differences in humidity that characterize the two. We find that the majority of extreme and oppressive heat events are associated with similar synoptic-scale atmospheric conditions. Additionally, both locally evaporated moisture and advected moisture sources were important for determining which of the two heat wave types occurred. Specifically, oppressive heat waves were characterized by abundant antecedent precipitation, surplus soil moisture, and elevated evapotranspiration and related atmospheric humidity. Lower humidity levels during extreme heat wave events were driven by relative reductions in evapotranspiration due to limited soil water content. Overall, our results suggest that the onset of heat waves in Illinois is primarily driven by circulation features in the upper atmosphere; however, the distinction of extreme or oppressive heat wave is due to differences in boundary layer humidity, driven in part by land surface moisture availability for evapotranspiration. ©2016. American Geophysical Union. All Rights Reserved. |
| 资助项目: | BCS-1339655
; BCS-1339655
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| Citation statistics: |
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| 资源类型: | 期刊论文
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/62734
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| Appears in Collections: | 影响、适应和脆弱性
气候减缓与适应
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作者单位: | Department of Geography and Environmental Resources, Southern Illinois University, Carbondale, IL, United States
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| Recommended Citation: | |
Ford T.W.,Schoof J.T.. Characterizing extreme and oppressive heat waves in Illinois[J]. Journal of Geophysical Research: Atmospheres,2017-01-01,122(2)
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