Showing papers in "Atmospheric Environment in 2003"

TL;DR: In this article, the kinetics, products and mechanisms of the tropospheric reactions of biogenic organic compounds are presented and briefly discussed, and the results of the reactions are discussed.

TL;DR: In this paper, a range of monitoring techniques are used to measure pollutant concentrations in urban street canyons, such as continuous monitoring, passive and active pre-concentration sampling, and grab sampling.

TL;DR: In this article, the authors measured the organic carbon and elemental carbon (EC) in atmospheric particles at 8 sites in four cities (Hong Kong, Guangzhou, Shenzhen and Zhuhai) of Pearl River Delta Region (PRDR), China during two winter months (January and February, 2002).

TL;DR: In this paper, the concentrations of 16 selected polycyclic aromatic hydrocarbons (PAHs) in aerosols were quantified, and spatial and seasonal variations of PAHs were characterized.

TL;DR: In this article, weekly PM 2.5 samples were collected in Shanghai, China at two sites, Tongji University and Hainan Road, and the ambient mass concentration and chemical composition of the PM2.5 were determined.

TL;DR: An improved particle-into-liquid sampler (PILS) has proven successful in both ground-based and aircraft experiments for rapid measurements of soluble aerosol chemical composition as discussed by the authors.

TL;DR: In this article, a global review of published reports of dissolved organic nitrogen (DON) in precipitation is presented, showing a land-to-sea gradient in organic nitrogen concentration over time.

TL;DR: In this article, a thermal desorption particle beam mass spectrometer (TDPBMS) and tandem differential mobility analyzers (TDMA) were used for on-line measurements of the chemical composition and volatility of nanoparticles and larger particles emitted from a modern, heavy-duty diesel engine operated at light and medium loads under laboratory conditions.

TL;DR: In this paper, an additive used to keep the blends homogenous and stable, and an ignition improver, which can enhance cetane number of the blends, have favorable effects on the physicochemical properties related to ignition and combustion of diesel fuel with 10% and 30% ethanol by volume.

TL;DR: In this article, measurements of particle number size distribution in the range 11 −452 nm have been made on the side of the busy Marylebone Road in central London over a period from April 1998 to August 2001.

TL;DR: In this article, results of three hybrid receptor models, including potential source contribution function (PSCF), concentration weighted trajectory (CWT), and residence time weighted concentration (RTWC), were compared for locating polychlorinated biphenyl (PCB) sources contributing to the atmospheric concentrations in Chicago.

TL;DR: This article used unique mesocosms to examine the role that plants play in accumulating and transforming atmospheric Hg and found that approximately 80% of the total Hg accumulated in the aboveground biomass was found in the leaves, and roughly 1% of that Hg was methylated.

TL;DR: Aerosol samples for PM10 and PM2.5 were collected by high-volume (hi-vol.) samplers and the concentrations of major elements, ions, organic and elemental carbons were quantified.

TL;DR: In this article, five neural network (NN) models, a linear statistical model and a deterministic modelling system (DET) were evaluated for the prediction of urban NO2 and PM10 concentrations.

TL;DR: In this article, the authors evaluate published data from volcanic plumes, and combine this with information from natural archives to show unequivocally the significance of volcanoes for the global biogeochemical mercury cycle.

TL;DR: In this article, the authors examined the kosa (Asian dust) aerosol at eight locations in China and Japan along the route of the dust event in March 2001 and found that the concentrations dropped by one order of magnitude as the dust was transported from the interior of China to Japan.

TL;DR: In this paper, samples of atmospheric deposits were collected at urban, suburban and rural locations in the Pearl River Delta (including Hong Kong) using bulk deposition samplers in the summer and winter seasons of 2001-2002.

TL;DR: In this article, the authors presented three different maps of the distribution of dust storms, drifting dust, and the number of dusty days in Mongolia and compared them with data between 1937 and 1989. But the results of the analysis showed that the number number of days with dust storms is o5 days over the Altai, the Khangai and the Khentei mountainous regions and more than 20-37 days in the Gobi Desert and semi-desert area.

TL;DR: In this article, the emissions of selected flame retardants were measured in 1-and 0.02-m3 emission test chambers and 0.001-m 3 emission test cells.

TL;DR: In this paper, the authors analyzed data from several ground sites in the Pacific Northwest and from aircraft observations in the region to identify six new episodes of trans-Pacific transport that occurred between 1993 and 2001.

TL;DR: In this paper, the authors investigated the complex relationship between meteorological and time period parameters and particle concentrations and found that PM2.5 and PM10 concentrations were highly correlated with carbon monoxide, black carbon and nitrogen oxides and inversely correlated with local wind speed.

TL;DR: In this article, an investigation on particulate and vapor phase distribution of n-alkanes and polycyclic aromatic hydrocarbons (PAHs) in urban atmosphere has been conducted.

TL;DR: In this article, a study of the concentrations of a range of inorganic elements and polycyclic aromatic hydrocarbons during a winter period at a roadside location in Birmingham, UK was conducted.

TL;DR: The chemical composition of aerosols has been determined in 30 size-resolved samples collected using a Berner low-pressure impactor during two campaigns conducted at a coastal site in the Eastern Mediterranean in July 2000 and in January 2001 as discussed by the authors.

TL;DR: Ren et al. as discussed by the authors compared the observed hydroxyl (OH) and hydroperoxy (HO2) radicals, collectively called H ox, calculated by a box model that used the regional atmospheric chemistry mechanism and was constrained to the ancillary measurements during the PM2.5 Technology Assessment and Characterization Study-New York (PMTACS-NY) summer 2001 intensive.

TL;DR: In this paper, a simple linear regression analysis was conducted to relate the emission rates of the metal contents in vehicle exhaust to the consumption rates of metal contents contained in diesel fuel, and the results indicated that the relatively high amount of metal content emitted from diesel engines strongly suggests that the measurement on the control of diesel fuel should be taken in the future.

TL;DR: In this paper, the effect of ethanol blended gasoline fuels on emissions and catalyst conversion efficiencies was investigated in a spark ignition engine with an electronic fuel injection (EFI) system, and three-way catalysts are effective in reducing acetaldehyde emissions, but the conversion of unburned ethanol is low.

TL;DR: In this article, the authors performed extensive mass and chemical measurements at roadside locations in Reno, Nevada and Durham/ Research Triangle Park (North Carolina) to derive tailpipe, resuspended road dust, and brake-wear emission factors from in-use vehicles.

TL;DR: In this article, simultaneous measurements of particle size distribution inside an urban street canyon and a nearby urban background location in Copenhagen in May-November 2001 were used to separate the traffic source contribution in the street canyon from the background levels.