Possible Sources for Some Trace Elements Found in Airborne Particles and Precipitation in Dorset, Ontario

Gao, Ning; Hopke, Philip K.; Reid, N.

doi:10.1080/10473289.1996.10467539

Cited by 37 publications

(13 citation statements)

References 14 publications

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“…Lacustrine sediment accumulation occurs over time, trapping atmospheric particulates within sediment stratigraphies (Veselý et al 1993;Oldfield 1990;Rose and Harlock 1998). The composition of urban PM is complex and includes particles ranging from 0.001 to 100 lm composed of minerals, heavy metals, organics, magnetic spherules and persistent organic pollutants (Gao et al 1996;Allen et al 2001;Phalen 2002). The application of a wide range of environmental analyses to urban pond sediments allows the reconstruction of datable, highresolution, detailed changes in these pollution characteristics and their deposition rates spanning the last 200-300 years from pre-industrial times to present day (Worsley et al 2005;Norton 1986;Renberg 1986;Griffin and Goldberg 1983).…”

Section: Associations Between Air Pollution and Healthmentioning

confidence: 99%

Using urban man-made ponds to reconstruct a 150-year history of air pollution in northwest England

Power

Worsley

2008

Environ Geochem Health

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A regional pollution history has been reconstructed for the borough of Halton (northwest England) from four urban ponds in north Cheshire and south Merseyside, using environmental analyses of lake sediment stratigraphies. Mineral magnetism, geochemistry and radiometric dating have produced profiles of pollution characteristics dating from the mid-nineteenth century to present day. These pollution profiles reflect the atmospheric deposition of a range of pollutants over 150 years of intensified industry. Distinct phases of pollution deposition and characteristics are identified reflecting: (1) intensification of industry in the nineteenth century; (2) expansion of industry during the twentieth century; (3) post 1956 Clean Air Acts. This work promotes the potential use of these pollution archives for use in epidemiology to better understand links between human health and environmental pollution, especially for diseases with long latency times, where retrospective pollution exposure assessments are important.

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Section: Associations Between Air Pollution and Healthmentioning

confidence: 99%

Using urban man-made ponds to reconstruct a 150-year history of air pollution in northwest England

Power

Worsley

2008

Environ Geochem Health

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“…Second, to enable analysis using daily air quality data such as particulate matter components and volatile organic compounds. The arrival height was chosen as 500 m above ground level to represent a well-mixed convective boundary layer for regional transport investigation (Gao et al, 1996;Hafner and Hites, 2003;Begum et al, 2005;Sigler and Lee, 2006). The EDAS 40 km meteorological data were used since the dataset had the finest spatial resolution for North America that was available on the HYSPLIT website.…”

Section: Backward Trajectorymentioning

confidence: 99%

Identification of potential regional sources of atmospheric total gaseous mercury in Windsor, Ontario, Canada using hybrid receptor modeling

Akhtar

2010

Atmos. Chem. Phys.

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Windsor (Ontario, Canada) experiences trans-boundary air pollution as it is located on the border immediately downwind of industrialized regions of the United States of America. A study was conducted in 2007 to identify the potential regional sources of total gaseous mercury (TGM) and investigate the effects of regional sources and other factors on seasonal variability of TGM concentrations in Windsor. TGM concentration was measured at the University of Windsor campus using a Tekran® 2537A Hg vapour analyzer. An annual mean of 2.02±1.63 ng/m3 was observed in 2007. The average TGM concentration was high in the summer (2.48±2.68 ng/m3) and winter (2.17±2.01 ng/m3), compared to spring (1.88±0.78 ng/m3) and fall (1.76±0.58 ng/m3). Hybrid receptor modeling potential source contribution function (PSCF) was used by incorporating 72-h backward trajectories and measurements of TGM in Windsor. The results of PSCF were analyzed in conjunction with the Hg emissions inventory of North America (by state/province) to identify regions affecting Windsor. In addition to annual modeling, seasonal PSCF modeling was also conducted. The potential source region was identified between 24–61° N and 51–143° W. Annual PSCF modeling identified major sources southwest of Windsor, stretching from Ohio to Texas. The emissions inventory also supported the findings, as Hg emissions were high in those regions. Results of seasonal PSCF modeling were analyzed to find the combined effects of regional sources, meteorological conditions, and surface re-emissions, on seasonal variability of Hg concentrations. It was found that the summer and winter highs of atmospheric Hg can be attributed to areas where large numbers of coal fired power plants are located in the USA. Weak atmospheric dispersion due to low winds and high re-emission from surfaces due to higher temperatures also contributed to high concentrations in the summer. In the winter, the atmospheric removal of Hg was slow, but strong winds led to more dispersion, resulting in lower concentrations than the summer. Future studies could use smaller grid sizes and refined emission inventories, for more accurate analysis of source-receptor relationship of atmospheric Hg

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“…PSCF explicitly incorporate the airborne concentration data and air parcel backward trajectories and estimates the conditional probability function that an air parcel with a specified level of a pollutant concentration arrived at a receptor site after having passed through a specific region (Cheng et al, 1993;Gao et al, 1996;Kindap et al, 2006;Mehta et al, 2009;Neimi et al, 2009). The PSCF in an ij-th grid cell of a geophysical region is defined as:…”

Section: Potential Source Contribution Function (Pscf)mentioning

confidence: 98%

Potential source identification for aerosol concentrations over a site in Northwestern India

Payra

Kumar

Verma

et al. 2016

Atmospheric Research

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The collocated measurements of Aerosols Size Distribution (ASD) and Aerosol Optical Thickness (AOT) are analyzed simultaneously using Grimm aerosol spectrometer and MICROTOP II Sunphotometer respectively over Jaipur, capital of Rajasthan in India.The contrast temperature characteristics during winter and summer seasons of year 2011 are investigated in the present study. The total aerosol number concentration (TANC, 0.3-20 um) during winter season was observed higher than in summer time and it was dominated by fine aerosol number concentration (FANC <2 μm). Particles smaller than 0.8 micrometer (at aerodynamic size) constitute ~99% of all particles in winter and ~90% of particles in summer season. However, particles greater than 2 μm contribute ~3% and ~0.2% in summer and winter seasons respectively. The aerosols optical thickness shows nearly similar AOT values during summer and winter but corresponding low Angstrom Exponent (AE) values during summer than winter, respectively. In this work, Potential Source Contribution Function (PSCF) analysis is applied to identify locations of sources that influenced concentrations of aerosols over study area in two different seasons. PSCF analysis shows that the dust particles from Thar Desert contribute significantly to the coarse aerosol number concentration (CANC).Higher values of the PSCF in north from Jaipur showed the industrial areas in northern India to be the likely sources of fine particles. The variation in size distribution of aerosols during two seasons is clearly reflected in the log normal size distribution curves.The log normal size distribution curves reveals that the particle size less than 0.8 µm is key contributor in winter for higher ANC.

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Possible Sources for Some Trace Elements Found in Airborne Particles and Precipitation in Dorset, Ontario

Cited by 37 publications

References 14 publications

Using urban man-made ponds to reconstruct a 150-year history of air pollution in northwest England

Using urban man-made ponds to reconstruct a 150-year history of air pollution in northwest England

Identification of potential regional sources of atmospheric total gaseous mercury in Windsor, Ontario, Canada using hybrid receptor modeling

Potential source identification for aerosol concentrations over a site in Northwestern India

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