Airborne Particle Size Distribution Measurements at DOE Fernald

Harley, Naomi H.; Chittaporn, Passaporn; Heikkinen, Maire S.A.; Medora, R.; Merrill, Richard A.

doi:10.1021/bk-2005-0904.ch015

Cited by 3 publications

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“… Kada and Heit [1992] have shown that 210 Pb and 137 Cs can be used to account for the depositional focusing of the anthropogenic trace elements Pb, Zn, As, and Cd. Since the size distribution of EC is similar to that of Pb‐bearing aerosols [ Harley et al , 2005], the use of these isotopes should also be equally applicable to EC‐bearing aerosols. Several investigators have addressed the question of catchment contributions [ Lewis , 1977; Scott et al , 1985; Dominik et al , 1987].…”

Section: Theory Of Atmospheric Ec Determination From Ec In Sedimentmentioning

confidence: 99%

Trends in atmospheric elemental carbon concentrations from 1835 to 2005

et al. 2008

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[1] Elemental carbon (EC) aerosols absorb solar radiation which results in heating of the atmosphere. Recent increases in the atmospheric burden of EC may account for $10 to 15 % of global warming. Long-term EC data, however, are sparse. We report here our measurements of annual mean atmospheric EC concentration, [EC] for 1978-1986, 1987-1996, and 1997-2005 were, 550, 225, and 62 ng m À3, respectively. We also collected $55 cm long sediment cores from West Pine Pond near Whiteface Mountain. The cores were sliced and their 210 Pb ages determined. The first (top) five slices each represented sediment deposition over 7 years and the remaining 13 years each. EC was chemically separated from the sediment samples from four cores, and its concentration in each slice was determined using the thermal optical method. from 1917from -1930from . From 1931from -1943from through 1978from -1984, the concentration decreased gradually, from 680 to 560 ng m À3. The concentrations for 1985-1991, 1992-1998, and 1999-2005 were 295, 195, and 60 ng m À3 , respectively. Model calculations for BC emissions from fossil fuel combustion for the US by Novakov et al. (2003) qualitatively reproduce the trend determined experimentally in this work.

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Section: Theory Of Atmospheric Ec Determination From Ec In Sedimentmentioning

confidence: 99%

Trends in atmospheric elemental carbon concentrations from 1835 to 2005

et al. 2008

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“…Thoron is calculated by signal difference between the two sets of measurements. A more detailed description of the 4Leaf radon/thoron detector is reported [1].…”

Section: Radon and Thoron Measurementsmentioning

confidence: 99%

“…A low flow pump (4-6 l/min) draws the atmosphere sampled through the sampler for periods of up to 2 months to yield an integrated particle size distribution. The operations at Fernald are described elsewhere with a more complete description of the particle size sampler [1]. Radon gas is present in all atmospheres, and most of its short-lived decay products attach immediately to the ambient aerosol particles and decay to long-lived 210 Pb/ 210 Po.…”

Section: Particle Size Measurementsmentioning

confidence: 99%