Journal ArticleDOI
Sources of polonium-210 in atmosphere
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In this paper, the authors investigated the sources of atmospheric /sup 210/Po in the troposphere and found that the most important sources are soil particles and plant exudates, both of which are natural sources.Abstract:
Mean tropospheric aerosol residence times determined from cosmic ray-produced isotope activity ratios, fallout, and /sup 210/Po//sup 210/Pb ratios are concluded to be in error. Thus, complementary sources of /sup 210/Po in the atmosphere must exist. Results presented substantiate dust storms, coal-burning power plants, forest fires, and plant exudates as sources of atmospheric /sup 210/Po. Preliminary estimates of the magnitude of these and other possible complementary sources of atmospheric /sup 210/Po are made. The most important sources appear to be soil particles and plant exudates, both of which are natural sources. The largest anthropogenic source is associated with phosphate fertilizer production. Together, the complementary sources account for most of the /sup 210/Po in the troposphere. Thus, a shorter residence time of 4-6 days appears reasonable.read more
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Trace elements in soils and plants
TL;DR: The Biosphere The Anthroposphere Soils and Soil Processes Weathering Processes Pedogenic Processes Soil Constituents Trace Elements Minerals Organic Matter Organisms in Soils Trace Elements in Plants.
Journal ArticleDOI
Po-210 and Pb-210 as atmospheric tracers and global atmospheric Pb-210 fallout: A Review
TL;DR: Recent results from the distribution of these nuclides in size-fractionated aerosols appear to yield consistent residence time in smaller-size aerosols, possibly suggesting that larger size aerosols are derived from resuspended dust.
Journal ArticleDOI
210Pb balance in Long Island Sound
TL;DR: In this article, a material balance was constructed for excess 210Pb (relative to 226Ra) as a test of the retentivity of Long Island Sound for a reactive heavy metal.
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Residence time of arctic haze aerosols using the concentrations and activity ratios of 210Po, 210Pb and 7Be
Mark Baskaran,Glenn E. Shaw +1 more
TL;DR: In this paper, the authors have carried out a pilot study to explore the feasibility of determining the residence time of aerosols from the arctic haze using the disequilibrium between the 210 Po and 210 Pb, varied between 0 and 39 days.
Journal ArticleDOI
Speculations on the budget of particulate and vapor phase non-methane organic carbon in the global troposphere
TL;DR: In this article, the global source, distribution, and fluxes of non-methane organic matter are investigated. But, the authors admit that less is known about the global sources and distribution of organic matter than any other major class of chemical substances in the atmosphere.