Numerical Modelling of the Thermal Internal Boundary-Layer Evolution Using Athens Field Experimental Data

Levitin, Joseph; Kambezidis, H. D.

doi:10.1023/a:1000397032677

Cited by 11 publications

(8 citation statements)

References 11 publications

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“…The method based on the TKE minimum has been widely used, including in some studies over the Vancouver LFV region (Batchvarova et al 1999;Cai and Steyn 2000). Results are not always consistent with values obtained from the potential temperature vertical profile, especially for values larger than 400 m (Liu et al 2001;Levitin and Kambezidis 1997). Results are not always consistent with values obtained from the potential temperature vertical profile, especially for values larger than 400 m (Liu et al 2001;Levitin and Kambezidis 1997).…”

Section: B Near-surface Meteorology Over the Citymentioning

confidence: 91%

Subkilometer Numerical Weather Prediction in an Urban Coastal Area: A Case Study over the Vancouver Metropolitan Area

Leroyer

Bélair

Husain

et al. 2014

Journal of Applied Meteorology and Climatology

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Numerical weather prediction is moving toward the representation of finescale processes such as the interactions between the sea-breeze flow and urban processes. This study investigates the ability and necessity of using kilometer-to subkilometer-scale numerical simulations with the Canadian urban modeling system over the complex urban coastal area of Vancouver, British Columbia, Canada, during a sea-breeze event.Observations over the densely urbanized areas, collected from the Environmental Prediction in Canadian Cities (EPiCC) network and from satellite imagery, are used to evaluate several aspects of the urban boundary layer features simulated in three model configurations with different grid spacings (2.5 km, 1 km, and 250 m). In agreement with the observations, results from the numerical experiments with 1-km and 250-m grid spacings suggest that two sea-breeze flows converge over the residential areas of Vancouver. The resulting convergence line oscillates around the hill ridge, depending on thermal contrast and flow strength. This propagation mode impacts the growing urban boundary layer, with the presence of subsidence and entrainment events. Urban-induced circulation is superimposed with the sea-breeze circulation and realistically slows down the propagation of the sea-breeze front to the south. A clear improvement is obtained for numerical experiments with 1-km instead of 2.5-km grid spacing. The use of subkilometer grid spacing provides a more detailed representation of the surface thermal forcing and of local circulations, with results more sensitive to the airflow variability and, thus, to the location of measurement sites. Joint analyses of kilometer-and subkilometerscale numerical experiments are thus recommended for different environmental applications.

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Section: B Near-surface Meteorology Over the Citymentioning

confidence: 91%

Subkilometer Numerical Weather Prediction in an Urban Coastal Area: A Case Study over the Vancouver Metropolitan Area

Leroyer

Bélair

Husain

et al. 2014

Journal of Applied Meteorology and Climatology

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“…The following topics are not extensively discussed: pollutant dispersion models (Clappier et al 2000;Melas et al 2006), land-surface models (Cheng and Byun 2008), linear and analytical models (Rotunno 1983;Niino 1987;Dalu and Pielke 1989;Qian et al 2009;Drobinski and Dubos 2009), laboratory experiments (Simpson 1997;Cenedese et al 2000;Hara et al 2009), land breezes (Buckley and Kurzeja 1997), and convective internal boundary-layer growth Kuwagata et al 1994;Levitin and Kambezidis 1997;Liu et al 2001;Miller et al 2003).…”

Section: Figmentioning

confidence: 99%

Sea and Lake Breezes: A Review of Numerical Studies

Crosman

Horel

2010

Boundary-Layer Meteorol

279

225

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Numerical studies of sea and lake breezes are reviewed. The modelled dependence of sea-breeze and lake-breeze characteristics on the land surface sensible heat flux, ambient geostrophic wind, atmospheric stability and moisture, water body dimensions, terrain height and slope, Coriolis parameter, surface roughness length, and shoreline curvature is discussed. Consensus results on the influence of these geophysical variables on sea and lake breezes are synthesized as well as current gaps in our understanding. A brief history of numerical modelling, an overview of recent high-resolution simulations, and suggestions for future research related to sea and lake breezes are also presented. The results of this survey are intended to be a resource for numerical modelling, coastal air quality, and wind power studies.

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“…Although, the air pollution problems have significantly deteriorated in Athens, the area still suffers from specific air-quality problems, mainly due to high concentrations of ozone and particulates measured by the relevant authorities Kassomenos et al, 1995Kassomenos et al, , 2003. The main sources of these problems are the emissions of air pollutants, which are caused by a variety of man-made processes, which can be classified into source groups: motor traffic, industry, power plant, trade and domestic fuel (Kambezidis et al, 1998;Levitin and Kambezidis, 1997). Motor vehicle traffic seems to be the most important source group for air pollution in Greater Athens Area (GAA).…”

Section: Data Collectionmentioning

confidence: 99%

Socioeconomic Aspects in an Extended Contemporary City

Kassomenos

2005

Water Air Soil Pollut

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Contemporary cities face significant traffic problems that tend to degrade the quality of life. Moreover, traffic habits of the residents in each city district are directly related to their socioeconomic status. In order to study the traffic patterns in a city and its suburbs, a huge amount of traffic data (number of automobiles, composition of the fleet, etc.) is required. Since these data are not available in many cases, carbon monoxide (CO), a pollutant routinely recorded in almost all cities since early 1970s, is proposed to be used as an indicator of the traffic volume and characteristics of a city. In an urban environment, CO is almost exclusively emitted from automobiles, while rarely presenting chemical activity. This method was applied to the city of Athens and its suburbs to characterize the traffic habits (patterns) in relation to the socioeconomic status of the residents.

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Numerical Modelling of the Thermal Internal Boundary-Layer Evolution Using Athens Field Experimental Data

Cited by 11 publications

References 11 publications

Subkilometer Numerical Weather Prediction in an Urban Coastal Area: A Case Study over the Vancouver Metropolitan Area

Subkilometer Numerical Weather Prediction in an Urban Coastal Area: A Case Study over the Vancouver Metropolitan Area

Sea and Lake Breezes: A Review of Numerical Studies

Socioeconomic Aspects in an Extended Contemporary City

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