Showing papers in "Atmospheric Environment in 1985"

TL;DR: In this paper, a Principal Component Analysis (PCA) of paniculate elemental data is employed to identify and quantify the major particle pollution source classes affecting a monitoring site in metropolitan Boston, MA.

TL;DR: In this paper, a statistical method is developed to determine the locations of major pollutant sources affecting a distant downwind receptor, provided that air trajectories can be estimated, and a source contribution function is formulated to indicate the relative contribution of different source regions to high concentrations at the receptor.

TL;DR: In this paper, the authors reported measurements of light-absorbing material in the Arctic snowpack for longitudes from 25 E to 160 W. The contributions to light absorption due to natural crustal and soot aerosol are identified by their wavelength dependence.

TL;DR: In this paper, the qualitative composition of volatile organic compounds (VOC) produced by 22 species of plants which are characteristic for Northern hemisphere forests has been studied and the emission rate of isoprene and terpenes for some of them has been determined.

TL;DR: In this paper, the relative importance of particle vs gas scavenging for organic compounds was determined and compared to Gas scavenging ratios (Wg) obtained concurrently, in order to determine how important particle vs GC scavenging is.

TL;DR: In this article, the weekly average concentration of 25 aerosol constituents has been measured routinely at three locations in Canada between 1979 and 1984, and the seasonal variation of an aerosol constituent depends on its source.

TL;DR: The TEAM study as discussed by the authors measured exposures to 20 volatile organic compounds in personal air, outdoor air, drinking water and the breath of 355 persons in NJ, in the fall of 1981.

TL;DR: In this article, the authors describe the design, construction and testing of a simple sampling device for determining ammonia fluxes in the atmosphere, which they use to measure the air flow through the sampler at a rate linearly proportional to the external wind speed.

TL;DR: In this article, the authors evaluated portable air cleaning devices for control of indoor concentrations of respirable particles using in situ chamber decay tests, and found that particle size distribution was log normal with a count median diameter of 0.15 μm and a geometric standard deviation of 2.0.

TL;DR: In this article, 2-nitrofluoranthene (2-NO2-FL) and pyrene have been identified and quantified in paniculate organic matter (POM) samples collected in polluted ambient air in southern California.

TL;DR: In this paper, chamber experiments were conducted to study the aerosol products from ozonolysis of the major atmospheric monoterpenes; α -pinene, β -pinenes, and limonene.

TL;DR: A combination of anthropogenic activities and a possible decline of global concentrations for the hydroxyl radicals that formerly removed methane from the atmosphere are cited as potential causes for the 1.3 percent/year rise of atmospheric methane levels.

TL;DR: In this paper, airborne particles of diameter > 0.4 μm reaching Dye 3, Greenland during April-May 1983 were highly variable in size and concentration from day to day.

TL;DR: A field-exposure research facility was constructed to provide a controlled environment to determine the influence of various components of ozone exposure (concentration, frequency and duration) on plant response as discussed by the authors.

TL;DR: In this article, a laboratory and field study was performed to assess the contribution to visibility reduction of both light scattering and absorption by air pollutant particles and gases, focusing on minimizing sampling artifacts for nitrate and sulfate since previous visibility studies were generally subject to substantial errors from these sources.

TL;DR: In this paper, a study of retention time, defined as the length of time for a pollutant concentration with its source turned off to reach e−1 of its original value, has been carried out with SF6 tracer gas in an urban street canyon for the case of ambient winds perpendicular to the street.

TL;DR: In this article, the quasistationary, large scale, atmospheric phenomenon termed blocking is proposed to be a fundamental mechanism that provides conditions for poleward transport of midlatitudinal air pollution.

TL;DR: In this article, the dissociation constant, K 1, and Henry's Law constant for HCl have been calculated from vapour pressure and activity data: log 10 K 1 = −3.811 + 2995/ T (K)log 10 K h = −1.524 + 878.6/T (K), and ΔG f 298 and ΔH f 298 of associated HCl are estimated to be −23.0 ± 0.2

TL;DR: In this paper, six chemical reaction mechanisms for photochemical smog are analyzed to determine why, under identical conditions, they predict different maximum ozone concentrations, and to identify specific aspects of each mechanism that are responsible for the discrepancies with other mechanisms.

TL;DR: A seven-element tracer system for regional pollution aerosol has been applied to 100 daily samples of aerosol from Barrow, Alaska during winter 1979-1980, using regional signatures from eastern N America, Europe, and the Soviet Union as mentioned in this paper.

TL;DR: In this article, a mathematical model is used to study the fate of nitrogen oxides (NO_x) emissions and the reactions responsible for the formation of nitric acid (HNO_3).

TL;DR: In this article, the authors describe the results of a five-month study during which 222Rn (radon) concentration, air exchange (or ventilation) rate, and weather and radon source parameters were continuously monitored in a house near Chicago, with a view to accounting for the radon entry rate.

TL;DR: In this article, tunable diode laser absorption, tungstic acid denuder tube and a filter pack containing a Teflon-nylon-W41 filter combination were compared under field conditions in Southwestern Ontario during 1-14 June 1982.

TL;DR: In this article, the authors measured deposition velocities for O3 to grassland by the gradient method and found that O3 deposition is inhibited by the presence of snow or moisture at the surface and tends to decrease as the afternoon progresses.

TL;DR: In this article, a model for the prediction of atmospheric light extinction from field measurements of airborne aerosol concentration, chemical speciation, and size distribution has been tested with field data from the Detroit, Michigan area.

TL;DR: In this paper, a system of partial differential equations is developed to describe an aerosol entering from an open field into a downwind forest, where deposition and turbulent transfer affect particle concentration.

TL;DR: Aromatic hydrocarbons were measured in twelve United States cities during 1979-1984 with the help of an instrumented mobile laboratory as mentioned in this paper, with an average concentration of 1.9 ppb benzene.

TL;DR: In this paper, photo-oxidation of DMS under atmospheric conditions was studied both in dry ( [H 2 O] ppm ) and in humid air (relative humidity ~ 35% at 30°C).

TL;DR: In this article, a closed box aerosol droplet model is developed to simulate the potential degassing of HC1, taking into account thermodynamic and droplet radius effects, and equilibrium degassing is calculated and found to be very high, greater than 90 % of the initial hydrogen ion concentration for relative humidities less than about 98 %.

TL;DR: A study of deposition velocities to snow was conducted during the 1982-1983 and 1983-1984 winters at the University of Michigan Biological Station in northern Michigan as mentioned in this paper, where weekly measurements were made of dry deposition rates to snow and the atmospheric concentrations of the depositing species.