DOI: 10.1002/jgrd.50670
论文题名: Simultaneous, common-volume lidar observations and theoretical studies of correlations among Fe/Na layers and temperatures in the mesosphere and lower thermosphere at Boulder Table Mountain (40°N, 105°W), Colorado
作者: Huang W. ; Chu X. ; Gardner C.S. ; Wang Z. ; Fong W. ; Smith J.A. ; Roberts B.R.
刊名: Journal of Geophysical Research Atmospheres
ISSN: 21698996
出版年: 2013
卷: 118, 期: 15 起始页码: 8748
结束页码: 8759
语种: 英语
英文关键词: constituent transport
; correlation
; gravity wave dynamic effects
; lidar temperature
; mesospheric metal layers
; thermospheric metal layers
Scopus关键词: Correlation methods
; Gravity waves
; Indicators (chemical)
; Optical radar
; Temperature distribution
; Constituent transport
; Gravity-wave dynamics
; Lidar temperature
; Mesospheric metal layers
; Metal layer
; Sodium
; correlation
; Doppler lidar
; Gaussian method
; gravity wave
; iron
; mesosphere
; sodium
; theoretical study
; thermosphere
; Boulder Mountain
; United States
; Utah
英文摘要: Simultaneous and common-volume observations of Fe density, Na density, and temperatures in the mesosphere and lower thermosphere were made for 12 nights with an Fe Boltzmann lidar and a Na Doppler lidar at the Table Mountain Lidar Facility (40.13°N, 105.24°W) near Boulder, Colorado, in August and September 2010. We derive the correlations among temporal variations of Fe/Na densities and temperatures, eliminating the covariance bias via computing the cross correlations between Fe (Na) density and Na (Fe) temperature perturbations. The Fe-Na density correlation is positive below the Fe layer peak and above the Na peak where the Fe/Na density gradients have the same signs but becomes negative in between the Fe and Na peaks where the gradients are opposite. The large correlation between temperature and density fluctuations is positive on the layer bottomside but negative on the topside with the transitions occurring near the layer peaks. The relative Fe/Na variances reach minimum near the layer peaks but rapidly increase and exceed the relative temperature variance significantly toward edges. These observations can be largely reproduced by theoretically modeling the metal layer responses to the wave-induced perturbations only through dynamic processes with a Gaussian stationary density distribution. These results suggest that the dynamic effects (mainly the vertical displacement) induced by gravity waves or tides dominate the observed short-term density and temperature variations over a night. We explain the Fe/Na gradient difference observed at the bottomside via the chemical "shelf" around 80 km for reactive chemicals and the Fe/Na layer height difference. Key Points Correlations among Fe density, Na density and temperature variations in the MLT Wave-induced dynamical effects dominate constituent variations over a night Fe/Na gradient difference is explained with the chemical shelf at the bottomside ©2013. American Geophysical Union. All Rights Reserved. 资助项目: AGS-1115224
; AGS-1115725
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/63433
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: Cooperative Institute for Research in Environmental Sciences, Department of Aerospace Engineering Sciences, University of Colorado Boulder, Boulder CO 80309, United States; Department of Electrical and Computer Engineering, University of Illinois at Urbana-Champaign, Urbana IL, United States; Institute of Oceanographic Instrumentation, Shandong Academy of Sciences, Qingdao, China
Recommended Citation:
Huang W.,Chu X.,Gardner C.S.,et al. Simultaneous, common-volume lidar observations and theoretical studies of correlations among Fe/Na layers and temperatures in the mesosphere and lower thermosphere at Boulder Table Mountain (40°N, 105°W), Colorado[J]. Journal of Geophysical Research Atmospheres,2013-01-01,118(15)