DOI: 10.1016/j.atmosenv.2017.05.041
Scopus记录号: 2-s2.0-85020269669
论文题名: A study of the combined impact of boundary layer height and near-surface meteorology on the CO diurnal cycle at a low mountaintop site using simultaneous lidar and in-situ observations
作者: Pal S ; , Lee T ; R ; , De Wekker S ; F ; J
刊名: Atmospheric Environment
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2017
卷: 164 起始页码: 165
结束页码: 179
语种: 英语
英文关键词: Air pollution
; Carbon monoxide
; Convective boundary layer height
; Lidar
; Mountaintop
; Upslope flow
Scopus关键词: Air pollution
; Boundary layer flow
; Boundary layers
; Carbon
; Carbon dioxide
; Carbon monoxide
; Gases
; Meteorology
; Mixing
; Optical radar
; Pollution
; Wind
; Appalachian mountains
; Boundary layer heights
; Convective boundary layers
; Meteorological measurements
; Mountaintop
; Simultaneous measurement
; Standard meteorological variables
; Upslope flows
; Atmospheric movements
; carbon dioxide
; carbon monoxide
; tracer
; air mass
; airflow
; atmospheric pollution
; boundary layer
; carbon monoxide
; convective boundary layer
; diurnal variation
; flux measurement
; height
; in situ measurement
; lidar
; meteorology
; mixing ratio
; mountain region
; pollutant transport
; surface
; wind direction
; air pollutant
; airflow
; altitude
; Article
; atmospheric transport
; boundary layer
; circadian rhythm
; clinical evaluation
; conceptual framework
; convective boundary layer
; environmental monitoring
; gas mixing
; growth rate
; height
; human
; measurement accuracy
; meteorology
; mountaintop site
; priority journal
; water vapor
; wind
; Appalachians
Scopus学科分类: Environmental Science: Water Science and Technology
; Earth and Planetary Sciences: Earth-Surface Processes
; Environmental Science: Environmental Chemistry
英文摘要: Evaluations of air pollutants and trace gas measurements over mountaintop sites and their application in inverse transport models to estimate regional scale fluxes are oftentimes challenging due to the influences associated with atmospheric transport at both local and regional scales. The objective of this study is to investigate the diurnal cycle pattern of CO mixing ratio over a low mountaintop influenced by: (1) two different convective boundary layer (CBL) regimes (shallow and deep) and associated growth rates over the mountaintop, (2) the combined effect of a deep CBL with and without diurnal wind shift, and (3) slope flows and associated air mass transport. For this purpose, we used simultaneous measurements of lidar-derived CBL heights, standard meteorological variables, and CO2 and CO mixing ratio from Pinnacles, a mountaintop monitoring site in the Appalachian Mountains. We used both water vapor and CO2 mixing ratio as tracers for upslope flow air masses. We used case studies to focus on two different scenarios of daytime CO mixing ratio variability: (1) a gradual increase in the morning with a maximum in the afternoon, and (2) a gradual decrease in the morning with a minimum in the late afternoon. The second scenario is similar to the CO variability observed atop tall towers in flat terrain. Using the lidar-derived CBL height evolution and in situ CO, CO2 and meteorological measurements over the mountaintop, we found that the CBL height dynamics, regional scale wind shift, and upslope flow air masses arriving at the mountaintop in the morning affect the CO mixing ratio variability during the remaining part of the diurnal cycle. These findings help introduce a conceptual framework that can explain and differentiate the opposite patterns (i.e. daytime increase versus daytime decrease) in the CO diurnal cycles over a mountaintop site affected by upslope flows and provide new roadmaps for monitoring and assimilating trace gas mixing ratios into applications requiring regionally-representative measurements. © 2017 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/82736
Appears in Collections: 气候变化事实与影响
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作者单位: Department of Environmental Sciences, University of Virginia, Charlottesville, VA, United States; Department of Meteorology and Atmospheric Science, The Pennsylvania State University, University ParkPA, United States; Oak Ridge Associated Universities, NOAA ARL Atmospheric Turbulence and Diffusion Division, Oak Ridge, TN, United States
Recommended Citation:
Pal S,, Lee T,R,et al. A study of the combined impact of boundary layer height and near-surface meteorology on the CO diurnal cycle at a low mountaintop site using simultaneous lidar and in-situ observations[J]. Atmospheric Environment,2017-01-01,164