2 edition of NMOC and ozone aloft and their effect on modeled urban ozone production and control strategies found in the catalog.
NMOC and ozone aloft and their effect on modeled urban ozone production and control strategies
Lorne Douglas MacGregor
Written in English
|Statement||by Lorne Douglas MacGregor.|
|The Physical Object|
|Pagination||ix, 83 leaves, bound :|
|Number of Pages||83|
The Concept of Ozone-Forming Potential and Its Quantification In any given airshed, it is common to find hundreds of different VOC species, each with its own unique chemistry. In the simplest approach to ozone mitigation based on VOC controls, emission reductions are implemented on a mass basis without any regard to the unique chemistry of each Chemical sensitivity analysis (CSA) is a new probing tool for sampling sensitivities to chemistry parameters during a three-dimensional (3-D) simulation. CSA was applied to rank all of the parameters in the Carbon Bond 6 revision 4 (CB6r4) mechanism and to create an ensemble of six chemical mechanisms representing higher and lower O3 formations than CB6r4. This ensemble of
For ozone, WRF‐Chem was biased low (− ppb mean bias for daytime ozone) and underestimated hourly peak ozone. In some cases, ozone bias can be attributed to transport and lake breeze errors. Average ozone concentration showed minor ( Components of Exposure. Human exposure to a pollutant, and its consequent impact on health, results from the simultaneous occurrence of two events—a pollutant concentration c(x,t) at point x and time t, and the presence of people. Exposure=f[P(x,t), c(x,t)] where P(x,t) represents the number of people at point x and time t inhaling a pollutant at concentration c(x,t).
Global map of aerosol optical depth at nm derived from MODIS (May–July, –) using the Deep Blue algorithm over land [Hsu et al., ] and the Dark Target ocean algorithm over oceans [Levy et al., ] (courtesy of Jaehwa Lee of NASA/GFSC).Superimposed are the locations of the world's major monsoon :// AP-RT8DFR INVESTIGATION OF THE ATMOSPHERIC OZONE FORMATION POTENTIAL OF ACETYLENE F_专业资料。 Environmental chamber experiments and computer model calculations were carried out to assess the atmospheric ozone formation potential of ://
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NMOC and ozone aloft and their effect on modeled urban ozone production and control strategies Thesis/Dissertation MacGregor, L.D. An instrumented aircraft was used to measure non-methane organic carbon (NMOC) and ozone aloft, in the background air masses advected into seven urban areas in the U.S.A.
Measurements were made in the layer above The effect of NMOC and ozone aloft on modeled urban ozone production and control strategies. Journal of Air & Waste Management Associat Milford J.B., Russell A.G., McRae G.J., Photochemical Production of Ozone and Control Strategy for Southern Taiwan Article in Atmospheric Environment 41(40) December with 92 Reads How we measure 'reads' Effect of NMOC and ozone aloft on modeled urban ozone production and control strategies October Journal of the Air & Waste Management Association Lome MacGregor Nmoc, Ozone, And Organic Aerosol In The Southeastern United States, 2.
Ozone Trends And Sensitivity To Nmoc Emissions In Atlanta, Georgia December Duncan and Chameides () studied the export of ozone and ozone precursors from urban atmosphere to troposphere due to interventions taken in urban regions for emission control. The study showed that effect of urban emission controls strategies, on the export of primary and secondary ozone precursor compounds, is very :// Journal of the Air & Waste Management Association.
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Lome MacGregor & Hal Westberg. Pages: Effect of Fuel Properties on Mutagenic Activity in Extracts of Heavy-duty Diesel ?nav=tocList. TITLE AND SUBTITLE Review of Control Strategies for Ozone and Their Effects on Other Environmental Issues 7.
AUTHOR(S) Edwin L. Meyer, Jr. PERFORMING ORGANIZATION NAME AND ADDRESS U.S. EPA, Office of Air Quality Planning and Standards, Monitoring and Data Analysis Division Research Triangle Park, NC ?Dockey=NTXT.
A method that uses surface monitors to estimate the effect of ozone from aloft is given on pa and of the EKMA Guideline document, and in more detail by Chan, A!lard and Tombach ().
This method gives reasonable agreement with helicopter measure- ments of ozone ://?Dockey= Thus, the NMOC and NOX coordinates associated with any point on a single, curved line produce the same maximum concentration of ozone. In OZIPM-4, simulations are normally performed to produce such a diagram.
Reactivity This is a property of the precursors that governs the rate and extent of ozone ://?Dockey= NMOC, ozone, and organic aerosol in the southeastern United States, 1.
Spatial and temporal variations of NMOC concentrations and composition in Atlanta, Georgia Download Citation | Study of the meteorological influence on ozone in urban areas and their use in assessing ozone trends in all seasons from to in Tianjin, China | Ozone pollution in Page 10 Ozone Air-Quality Models Introduction.
To predict compliance with the ozone air-quality standard at some future date it is necessary to know how ozone concentrations change in response to prescribed changes in source emissions of precursor species: the oxides of nitrogen (NO x) and volatile organic compounds (VOCs).This assessment requires an air-quality model, which in the case Nuclear winter is a severe and prolonged global climatic cooling effect hypothesized to occur after widespread firestorms following a nuclear war.
The hypothesis is based on the fact that such fires can inject soot into the stratosphere, where it can block some direct sunlight from reaching the surface of the Earth. It is speculated that the resulting cooling would lead to widespread crop In essence, a number of high ozone days are modeled, and the precursor reduction needed to achieve the ozone NAAQS is selected such that it is consistent with the acceptable number of ozone peaks above ppm, and other possible changes in existing conditions which may take place (e.g., changes in the levels of pollutants aloft).?Dockey= This base-case point is located by finding the intersection of a design NMOC/NOX ratio line with the isopleth corresponding to the base-case ozone value.
Typically, the NMOC/NOX ratio used in the calculation is derived from a.m. measurements of NMOC and NOX taken in the urban core, and the base-case ozone value corresponds to a peak ozone ?Dockey= Figure illustrates the non-linearity of ozone production as a function of NO x levels at a constant VOC concentration and highlights how NO x is involved in both propagation and termination.
The competing chemical reactions result in the two distinct regions in the graph: the NO x-limited region to the left and the VOC-limited region to the ‘hump’ shape has important 1. Introduction. Volatile organic compounds (VOCs) are notable air pollutants as a result of their toxic or hazardous nature in ambient air (Jones,Lau et al.,Simpson et al.,Zhang et al., ).Furthermore, they are precursors to a number of secondary pollutants, such as tropospheric ozone (Atkinson and Arey,Carter,Carter, ), secondary organic aerosols The potential of emissions from urban vegetation combined with anthropogenic emissions to produce ozone and particulate matter has long been recognized.
This potential increases with rising temperatures and may lead to severe problems with air quality in densely populated areas during heat waves.
Here, we investigate how heat waves affect emissions of volatile organic compounds from urban precursor control strategy for reducing ozone levels be maintained while conducting additional research to definitively identify the contributing causes of the weekend effect and to quantify their contributions.
This chapter presents a multi-disciplinary research program needed to resolve the cause(s) and implications of the ozone weekend ://. A box model was selected to study the sensitivity of PM nitrate to NOx and oxidants.
Although a three-dimensional (3-D) model should ultimately be used for this investigation, existing databases were insufficient for the reliable application of a 3-D model (e.g., aloft concentrations needed to define boundary and initial conditions were not Web view.Rethinking the Ozone Problem in Urban and Regional Air Pollution discusses: The latest data and analysis on how tropospheric ozone is formed.
How well our measurement techniques are functioning. Deficiencies in efforts to date to control the problem. Approaches to reducing ozone precursor emissions that hold the most ://The NMOC composition aloft for the BASE case is taken from default values rec- ommended by Lurmann et al.
(). For cases A-D, similar fractional changes are made to the NMOC composition aloft as done for the surface layer. Car- bon fractions of methanoi in the NMOC aloft are taken to be the same as those in the surface layer for cases ://