DOI: 10.1002/2013JD020530
论文题名: Surface layer response to topographic solar shading in Antarctica's dry valleys
作者: Katurji M. ; Zawar-Reza P. ; Zhong S.
刊名: Journal of Geophysical Research Atmospheres
ISSN: 21698996
出版年: 2013
卷: 118, 期: 22 起始页码: 12332
结束页码: 12344
语种: 英语
英文关键词: Antarctica
; atmospheric surface layer
; eddy covariance
; microclimate
; sodar
; turbulence
Scopus关键词: Atmospheric temperature
; Atmospheric thermodynamics
; Boundary layers
; Soil moisture
; Sun
; Turbulence
; Wavelet analysis
; Antarctica
; Atmospheric surface layers
; Eddy covariance
; microclimate
; sodar
; Landforms
; boundary layer
; data set
; microclimate
; shading
; solar radiation
; surface layer
; topographic effect
; turbulence
; Antarctica
; East Antarctica
; McMurdo Dry Valleys
英文摘要: The effects of topographic shading on local flow transitioning and atmospheric surface layer properties are investigated using observational data from the Miers Valley, one of the dry valleys of Antarctica. A unique data set was collected during a 9 day period in the summer of 2012 using an eddy covariance system and a sound detection and ranging that provided vertical profiles of wind and turbulence characteristics in the surface layer and the lower part of the boundary layer within the Miers Valley. This data set is ideal for investigating the dynamics of flow transitioning due to topographic shading, without the atmosphere experiencing complete darkness. The lack of atmospheric humidity, soil moisture, and surface vegetation in the dry valleys creates an atmosphere within which the microclimatic responses are amplified, and as a result, the valley atmosphere is extremely sensitive to solar radiation. The entire measured valley boundary layer (up to 250 m above ground level) feels the transition from an unstable to a stable stratification as the surface temperature drops by 10°C in response to the topographic shading. Wavelet analysis reveals the dynamics of flow deceleration, stagnation, and oscillations as the flow transitions from an unstable to a stable boundary layer. The larger air mass (along valley) scales to the longer terrain fetch, and as the shade is cast over the valley, it retains some of the longer wavelengths of the flow. The cross-valley component influenced by the slopes is quicker to adjust to short-period oscillations and takes around three more hours before it couples with the oscillatory pattern of the along-valley flow. Key Points Effects of topographic shading on local flow transitioning in mountainous area Flow transitioning without atmosphere experiencing darkness Microclimate features of Antarctica's dry valley ©2013. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/63144
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: Center for Atmospheric Research, University of Canterbury, Private bag 4800, Christchurch, New Zealand; Department of Geography, Michigan State University, East Lansing, MI, United States
Recommended Citation:
Katurji M.,Zawar-Reza P.,Zhong S.. Surface layer response to topographic solar shading in Antarctica's dry valleys[J]. Journal of Geophysical Research Atmospheres,2013-01-01,118(22)