DOI: 10.1002/jgrd.50509
论文题名: The effect of sidewall forest canopies on the formation of cold-air pools: A numerical study
作者: Kiefer M.T. ; Zhong S.
刊名: Journal of Geophysical Research Atmospheres
ISSN: 21698996
出版年: 2013
卷: 118, 期: 12 起始页码: 5965
结束页码: 5978
语种: 英语
英文关键词: cold-air pool
; downslope flow
; sidewall forest canopy
; thermodynamic budget
; valley
Scopus关键词: Atmospheric movements
; Computer simulation
; Cooling
; Lakes
; Landforms
; Upper atmosphere
; Vegetation
; Advanced regional prediction systems
; cold-air pool
; Downslope flow
; Forest canopies
; Influence of vegetations
; Temperature inversions
; Two-dimensional numerical simulation
; valley
; Forestry
; airflow
; basin
; cold air
; forest canopy
; forest cover
; regional climate
; simulation
; valley
; weather forecasting
英文摘要: While the evolution and dynamics of cold-air pools in basins and valleys continue to be an active area of research, the influence of vegetation cover on cold-air pools remains largely unexamined. Recently, the Advanced Regional Prediction System (ARPS) atmospheric model has been modified to allow simulation of flow through a multilayer canopy (ARPS-CANOPY). In this study, two-dimensional numerical simulations are performed with ARPS-CANOPY to examine the impact of sidewall forest cover on diurnal cold-air pool formation inside an idealized valley. A cold-air pool develops regardless of the presence or absence of sidewall vegetation. However, the strength of the temperature inversion and the overall cooling appear to be substantially modified by sidewall vegetation. The coldest overall valley temperature occurs with no sidewall vegetation cover while the warmest occurs when the valley sidewalls are fully covered with vegetation. In simulations with partial forest cover, the nocturnal cooling in approximately the upper two thirds (lower one third) of the valley atmosphere is shown to be most sensitive to forest cover along the upper half (lower half) of the sidewall. The sidewall forest cover also affects downslope flows through a combination of weaker surface cooling beneath the forest canopy and increased drag on air flowing down the sidewalls. Finally, the strength of downslope flow is shown to be highly sensitive to the presence or absence of trees farther up the slope. Key points Valley atmosphere is coldest with bare sidewalls, warmest with forest cover Layer cooling sensitive to sidewall forest cover at similar height above floor Strength of downslope flow sensitive to forest cover farther up the slope © 2013. American Geophysical Union. All Rights Reserved. 资助项目: AGS-0938401
; ATM-0837860
Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/63622
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, Michigan State University, 1407 S. Harrison Rd., East Lansing, MI 48823, United States
Recommended Citation:
Kiefer M.T.,Zhong S.. The effect of sidewall forest canopies on the formation of cold-air pools: A numerical study[J]. Journal of Geophysical Research Atmospheres,2013-01-01,118(12)