Creation and fate of ozone layers aloft in Southern California

McElroy, James L.; Smith, T. B.

doi:10.1016/0960-1686(93)90297-c

Cited by 29 publications

(12 citation statements)

References 8 publications

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“…A layer with a high ozone concentration has the potential to mix downward to the surface via a deepening mixed layer (Blumenthal et al 1978;McElroy and Smith 1993;Zhang and Rao 1998;Hidy 2000;Solomon et al 2000;McKendry and Lundgren 2000). The 5 June episode provides a good example of the vertical down-mixing of ozone from the layer aloft created by long-range transport based on the existence of both the ozone layer aloft and convective activity over the SMR during daytime (see Figs.…”

Section: E Contribution To Surface Concentrationmentioning

confidence: 99%

Elevated Ozone Layers over the Seoul Metropolitan Region in Korea: Evidence for Long-Range Ozone Transport from Eastern China and Its Contribution to Surface Concentrations

Kim

Hwang

et al. 2010

Journal of Applied Meteorology and Climatology

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Elevated layers of high ozone concentration were observed over the Seoul metropolitan region (SMR) in Korea by ozonesonde measurements during 6-9 June 2003. An analysis of the synoptic-scale meteorological features and backward trajectories revealed that the layers were associated with the long-range transport of ozone from eastern China. Further examination of the long-range transport process responsible for the development of these layers was performed using the Community Multiscale Air Quality (CMAQ) model. CMAQ demonstrated that the upward mixing of ozone by convective activity in eastern China and subsequent horizontal transport aloft in the periphery of a slow-moving high pressure system led to the development of thick ozone layers over the SMR. Through comparative simulation studies, it was found that the surface ozone levels in the SMR can be significantly enhanced by the vertical down-mixing of ozone from the layer aloft with the growing mixed layer. On average, about 25% of the surface peak concentration in a given area during a high-ozone episode was due to the influence of the ozone layer aloft developed by the longrange transport process.

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Section: E Contribution To Surface Concentrationmentioning

confidence: 99%

Elevated Ozone Layers over the Seoul Metropolitan Region in Korea: Evidence for Long-Range Ozone Transport from Eastern China and Its Contribution to Surface Concentrations

Kim

Hwang

et al. 2010

Journal of Applied Meteorology and Climatology

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“…For instance, the structure of the sea‐land breeze, the presence of elevated pollution layers and the formation of the thermal internal boundary layer have been studied in locations such as Los Angeles [ Wakimoto and McElroy , 1986; Liu et al , 1987; Boucouvala and Bornstein , 2003] and Barcelona [ Soriano et al , 2001; Pérez et al , 2004]. McElroy and Smith [1993] and Dabdub et al [1999] examined the creation and fate of ozone in the SoCAB. Layers aloft were attributed to the action of slope flows (including convergence), convective elements transported into the inversion layer and undercutting by the sea breeze flow.…”

Section: Introductionmentioning

confidence: 99%

Multiscale modeling of air pollutants dynamics in the northwestern Mediterranean basin during a typical summertime episode

2006

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[1] The complex behavior of photochemical pollutants in the northwestern Mediterranean basin (NWMB) is conditioned by the superposition of circulations of different scale and the pattern of emissions. Therefore a new approach to the modeling of air quality in the NWMB has been adopted by combining the global climate-chemistry model ECHAM5/ MESSy and the regional modeling system MM5-EMICAT2000-CMAQ to analyze the high levels of photochemical air pollution during a typical summertime episode. We show that this combination of models is well suited to address the range of scales involved. The complexity of the area requires the application of high spatial and temporal resolution (2 km and 1 hour) modeling to cover local to regional interactions. We address the local and largescale processes controlling tropospheric ozone in the NWMB, notably emissions and photochemistry, convective and advective transport, deposition processes, and stratospheretroposphere exchange. The simulation results indicate that the ozone buildup largely results from local photochemical production, which strongly exceeds the removal rates through transport and deposition. The contribution by advective transport is limited, associated with the stagnant meteorological conditions. In the lower troposphere, local recirculation systems are of key importance. The strength of the land-sea breeze circulation and thermally or mechanically driven convection over the complex orography of the eastern Iberian coast can induce vertical transport and the layering of air pollution.

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“…During the morning, ozone concentrations aloft are sometimes significantly higher than observed by surface ozone monitoring stations. These ozone layers contribute to surface concentrations when they are entrained into the growing convective boundary layer [e.g., Fast et al , 2000; McElroy and Smith , 1993; Neu et al , 1994].…”

Section: Introductionmentioning

confidence: 99%

Effect of regional‐scale transport on oxidants in the vicinity of Philadelphia during the 1999 NE‐OPS field campaign

et al. 2002

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[1] A new meteorological-chemical model is used to determine the relative contribution of regional-scale transport and local photochemical production on air quality over Philadelphia. The model performance is evaluated using surface and airborne meteorological and chemical measurements made during a 30-day period in July and August of 1999 as part of the Northeast Oxidant and Particulate Study (NE-OPS). Good agreement between the simulations and observations was obtained. The bias in the vicinity of Philadelphia over the simulation period was À5.8 ppb for the peak ozone mixing ratio during the day and 2.0 ppb for the minimum ozone mixing ratio at night. Layers of ozone above the convective boundary layer were measured by both research aircraft and ozonesondes during the morning between 0900 and 1100 LT. The model demonstrates that upwind vertical mixing processes the previous afternoon, subsequent horizontal transport aloft, and depletion of ozone by NO titration within the stable boundary layer at night lead to the development of these layers. Ozone aloft was then entrained into the growing convective boundary, contributing to surface ozone concentrations. Through a series of sensitivity studies, we find that most of the ozone is the result of emissions in the vicinity of Philadelphia and Chesapeake Bay area, but up to 30-40% of the ozone during high ozone episodes was due to transport from upwind sources. Local emissions and meteorological conditions were largely responsible for one high ozone episode because of light winds.

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Creation and fate of ozone layers aloft in Southern California

Cited by 29 publications

References 8 publications

Elevated Ozone Layers over the Seoul Metropolitan Region in Korea: Evidence for Long-Range Ozone Transport from Eastern China and Its Contribution to Surface Concentrations

Elevated Ozone Layers over the Seoul Metropolitan Region in Korea: Evidence for Long-Range Ozone Transport from Eastern China and Its Contribution to Surface Concentrations

Multiscale modeling of air pollutants dynamics in the northwestern Mediterranean basin during a typical summertime episode

Effect of regional‐scale transport on oxidants in the vicinity of Philadelphia during the 1999 NE‐OPS field campaign

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