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Air pollution dispersion — distribution of air pollution into the atmosphere.
- Air Pollution Meteorology
- Air Pollution Meteorology and Dispersion
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Skip to search form Skip to main content You are currently offline. Some features of the site may not work correctly. Arya Published Physics. Preface Acknowledgments 1.
Air Pollution Meteorology
Not a MyNAP member yet? Register for a free account to start saving and receiving special member only perks. A substantial fraction of the nation's and the world's populations, fossil and nuclear energy production, heavy industry, vehicular traffic, and energy exploration and production lie within km of a coastline.
The large emissions of primary, and the production of secondary, pollutants combined with complex and often adverse meteorological conditions can result in increased air pollution levels. An adequate understanding of coastal zone air pollution dispersion is required to license and control point sources of primary pollutants, design regional emission control strategies for secondary pollutants contributing to photochemical oxidants, develop and implement emergency responses to accidental releases of radiological and hazardous materials, assess dry and wet deposition of trace metals and other contaminants into sensitive coastal ecosystems, and, potentially, predict dispersion of militarily significant chemical and biological agents.
Substantial progress has been made in understanding the mechanisms involved with dispersion over distances ranging from tens of meters to circumglobal. However, a gap appears in our understanding of processes involved in mesoscale dispersion 10 to km , particularly when mountainous and coastal regions are involved.
Coastal zone dispersion issues have been summarized by Lyons , Lyons et al. Dispersion is the combined impact of diffusion and transport. Both are influenced by the. Modification of stable onshore flowing air over heated land results in sharp discontinuities in diffusive behavior, including continuous fumigation of elevated plumes Lyons and Cole, A comparison of different coastal fumigation models is given by Stunder and Raman Plume trapping over land and ribbon plumes over water can result in locally high pollutant concentrations Lyons et al.
The diurnal cycling from land breeze to sea breeze presents special problems, especially for emergency response planners. Tracers, tetroons, sulfate aerosol data, and aerometric studies in the Los Angeles basin, the Chicago-Milwaukee area, along the U.
Figure 7. Yet plume transport in coastal zones involves inherently three-dimensional dynamic processes. Lyons and Cole hypothesized that mesoscale transport in sea breezes took the form of broad quasi-helical vortices extending parallel to the shore.
Very finemesh mesoscale numerical dispersion modeling of complex wind fields at the Kennedy Space Center Lyons et al. During sea breezes, plumes from continuous sources can evolve into contorted patterns.
As illustrated in Figure 7. Subsequently, these plumes can divide into several branches, with some material entering the gradient wind layer aloft and exiting the region. The remainder subsides into the sea breeze inflow layer, perhaps undergoing fumigation to the surface again many tens of kilometers from the source.
These processes can become even more complicated in the presence of heated coastal mountain slopes. Coastal katabatic winds are important locally since they result in the ventilation and consequent abatement of nocturnal pollutants in cities located on slopes Ulrickson and Mass, a, b. The size sorting of aerosols and pollen in regions of strong land and sea breeze systems' ascent and descent Lyons, ; Lyons et al. The influence of coastal mesoscale systems on optical and other electromagnetic transmissions is not completely understood.
Illustrated are recirculating flows, limited mixing depths in coastal zones, dynamic fumigation associated with the thermal internal boundary layer, and size sorting of aerosols. This two-dimensional conceptual model has been extant since the mids Lyons, Current efforts require verifying and quantifying many aspects of this model and expanding it to include the threedimensional structure of the land-sea breeze and its impacts on mesosale transport and clouds in regions of irregular coastlines, islands, estuaries, and complex topography.
Plan view left of the predicted plume of particles released from a continuous surface source over the Indian River, and right the same plume seen from an elevated southwesterly perspective showing the three-dimensional nature of the transport processes.
They then rise rapidly in the strong updrafts in the sea breeze front over the Florida mainland. Some of the pollution subsides back into the sea breeze inflow due to strong subsidence over the Indian River and then fumigates again as it moves inland some 20 km south of the source.
The other branch of the plume, ejected higher into the gradient flow, drifts almost due east as it exits the region Lyons et al.
Graphics courtesy of Cecil S. The mechanisms by which vertical and horizontal recirculation processes degrade coastal air quality are only partially understood.
Pollutant reen-trainment back into the inflow from the elevated return flow layer in offshore subsidence zones remains unquantified. Coastal circulations are major factors in exacerbating regional photochemical ozone pollution. Violations of the U. Worldwide ozone levels in cities as diverse as Oslo, Toronto, Athens, and Tokyo are strongly influenced by local sea breeze circulations and interactions with urban and complex terrain-induced circulations.
Low-level jets in lake breeze cells over the Great Lakes have not been well documented but may play a crucial role in regional photochemical pollution transport. Developing improved conceptual and mathematical models of the myriad processes involved is an ongoing challenge. The majority of diffusion simulation codes used today utilize the straight-line Gaussian plume or its progeny , segmented plume, or puff models.
This results largely from these models' relatively modest computational requirements, easily available input data, conceptual simplicity, and widespread acceptance by regulatory agencies. While they achieve modest accuracy in idealized environments, the gradients of heat flux, mixing depth, and surface roughness, as well as intense shear, updrafts, and subsidence, severely limit their suitability in coastal zones. During the past decade, mesoscale numerical models MNMs have gradually emerged as the basis of more advanced dispersion systems.
By the late s, three-dimensional prognostic codes began to drive regional photochemical grid models, especially in California Tesche, The emergence of affordable high-speed computing portends increasingly widespread use of numerical codes in dispersion research.
Many empirical models of the thermal internal boundary layer TIBL have been developed for coastal fumigation calculations Venkatram, Most do not address such factors as wind shear, variable initial air mass lapse rate, or coastal zone vertical motion. Three-dimensional MNMs account for such factors as heterogeneous land surfaces, complex topography, and irregular coastline shapes. By predicting the atmospheric state variables at each model grid point and time step, the MNM serves as the basis for new dispersion calculation methodologies.
Considerable effort remains before new dispersion methodologies become generally applicable tools. Four-dimensional data assimilation techniques, successfully used in regional MNMs, must be adapted to the strong gradients of the coastal zone Stauffer et al.
The interactions of coastal circulations with primary and photochemical aerosols and their treatment in regional meteorological and photochemical models are largely unaddressed issues in ozone and visibility modeling. Few field programs have been designed to observe coastal circulations and mesoscale dispersion on both sides of the littoral with equal intensity and through their entire diurnal cycle. There is a dearth of comprehensive studies of dispersion in the land breeze.
Improved coordination of large-scale air quality research efforts which concentrate efforts over land with offshore air-sea interaction studies would benefit both groups of investigators. Transport and diffusion processes in coastal zones are only partially understood, and what knowledge there is, is weighted toward straight coastlines in flat terrain under idealized meteorological conditions.
Dispersion modeling techniques currently in widespread use do not always account for even the known coastal zone dispersion mechanisms. Continued advances in affordable high-speed computing, prognostic mesoscale numerical modeling, and advanced dispersion simulation techniques promise to yield a more comprehensive understanding of coastal zone phenomena. Furthermore, these advanced technologies, once adequately tested, will soon be able to replace many current dispersion modeling systems used by the regulatory and emergency response communities.
There should be continued development and testing of advanced prognostic meteorological and coupled dispersion models to simulate, and eventually. Further investigations should be made of the role of coastal circulations in aggravating regional photochemical oxidant episodes, including interactions between locally emitted pollutants and those entering the region through long-range transport.
Comprehensive tracer programs should be conducted at increasingly less idealized coastal sites, which would allow for evaluation, validation, and eventual widespread use of improved dispersion models, as well as further quantification of the complex transport and diffusion processes affecting pollutants in the coastal zone.
Improved coordination should be required between air pollution and boundary layer field observation programs conducted on both sides of the littoral, which would advance knowledge of the underlying physical processes affecting dispersion over land, water, and the intervening transition zones. Almost half the U. In another 20 years this population is expected to more than double in size.
The unique weather and climate of the coastal zone, circulating pollutants, altering storms, changing temperature, and moving coastal currents affect air pollution and disaster preparedness, ocean pollution, and safeguarding near-shore ecosystems.
Activities in commerce, industry, transportation, freshwater supply, safety, recreation, and national defense also are affected. The research community engaged in studies of coastal meteorology in recent years has made significant advancements in describing and predicting atmospheric properties along coasts. Coastal Meteorology reviews this progress and recommends research that would increase the value and application of what is known today.
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Sign up for email notifications and we'll let you know about new publications in your areas of interest when they're released. Air Quality. Get This Book. Visit NAP. Looking for other ways to read this? No thanks. Suggested Citation: "7. Page 64 Share Cite. Page 65 Share Cite. Page 66 Share Cite. Page 67 Share Cite. Page 68 Share Cite. Page 69 Share Cite. Page 70 Share Cite. This page in the original is blank. Page 63 Share Cite. Login or Register to save! Contents Front Matter i—xii Executive Summary 1—4 1.
Introduction 5—8 2.
Air Pollution Meteorology and Dispersion
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Influences of boundary layer phenomena and meteorology on ambient air quality status of an urban area in eastern India. Monitoring and analyses of various air pollutants like particulate matter PM 10 , sulphur dioxide SO 2 , nitrogen dioxide NO 2 , ozone O 3 , carbon monoxide CO and ammonia NH 3 , as well as meteorological parameters temperature, humidity, wind speed and direction have been performed for the period between April and May, at three different sites an area with high vehicular density, a residential area and an industrial area of an urban area in eastern India. The hourly average concentration of surface ozone is found maximum at the industrial site The site with high vehicular density shows the maximum 24 h average concentration of NO 2 Maximum daily 24 h average concentration of PM 10 This detailed study reveals that variations in the concentration of different air pollutants manifest the combined effect of emission sources and patterns, planetary boundary layer height and meteorology. The height of the PBL is a crucial parameter for air quality analysis, pollutants dispersion and quantification of pollutant emissions and sources Coen et.
Preface Acknowledgments 1. INTRODUCTION TO AIR POLLUTION The Air Pollution Problem Sources of Air Pollution Air Pollutants Effects of Air.
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Air dispersion modeling simulates how air pollutants disperse in the atmosphere. Inputs to the model include emissions, stack parameters, meteorological data, terrain and the height of surrounding structures. Dispersion modeling is performed with computer programs that solve complex mathematical equations to calculate the downwind concentration of air pollutants from industrial sources. Air dispersion modeling is used by the DNR as part of the permit process to ensure that emissions from sources do not violate applicable air quality standards.
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Not a MyNAP member yet? Register for a free account to start saving and receiving special member only perks. A substantial fraction of the nation's and the world's populations, fossil and nuclear energy production, heavy industry, vehicular traffic, and energy exploration and production lie within km of a coastline. The large emissions of primary, and the production of secondary, pollutants combined with complex and often adverse meteorological conditions can result in increased air pollution levels. An adequate understanding of coastal zone air pollution dispersion is required to license and control point sources of primary pollutants, design regional emission control strategies for secondary pollutants contributing to photochemical oxidants, develop and implement emergency responses to accidental releases of radiological and hazardous materials, assess dry and wet deposition of trace metals and other contaminants into sensitive coastal ecosystems, and, potentially, predict dispersion of militarily significant chemical and biological agents.
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