EML Surface Air Sampling Program, 1990--1993 data

Larsen, Randy J.; Sanderson, C.G.; Kada, J.

doi:10.2172/188586

Cited by 26 publications

(28 citation statements)

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“…The global distribution of 210 Pb is dominated by tropospheric distribution with occasional ingestion from stratosphere and higher concentrations of 210 Pb are found in surface air at mid-latitudes rapidly decreasing towards higher latitudes. Although a world database of global atmospheric distribution of 210 Pb has been established, there is still a lack of data for Eastern Europe and Central Asia (Larsen et al, 1995;Preiss et al, 1996;Rulik et al, 1997). As 7 Be and 210 Pb are of different origin, their ratio should depend on the altitude from which the air was transported, on continental influences and on removal processes.…”

Section: Introductionmentioning

confidence: 99%

7Be to 210Pb concentration ratio in ground level air in Belgrade area

Todorović

Popović

Djuric

et al. 2005

Journal of Environmental Radioactivity

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Section: Introductionmentioning

confidence: 99%

7Be to 210Pb concentration ratio in ground level air in Belgrade area

Todorović

Popović

Djuric

et al. 2005

Journal of Environmental Radioactivity

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“…It is therefore an excellent tracer to focus on the validation of the wet deposition scheme in the model. Moreover, many measurements exist over the whole globe, such as monthly averaged surface air concentrations gathered by the Environmental Measurements Laboratory [Larsen et al, 1995] as well as annual concentrations and deposition fluxes compiled by Preiss et al [1996] in a large database.…”

mentioning

confidence: 99%

Wet deposition in a global size‐dependent aerosol transport model: 1. Comparison of a 1 year²¹⁰Pb simulation with ground measurements

Guelle¹,

Balkanski²,

Schulz³

et al. 1998

J. Geophys. Res.

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Abstract. We present and discuss results from a 1 year (1991) global simulation of the transport and deposition of •øPb with a new size-resolved aerosol transport model. The model accounts for aerosol size distribution and its evolution during transport. Our wet deposition scheme is size-dependent and distinguishes between scavenging by deep and shallow convective rains. It treats separately below-and in-cloud scavenging by synoptic rains. Although the model is formulated to treat all aerosol sizes, the vahdation was done for the •øPb submicronic aerosol for which the main sink is wet deposition. We assess the model transport and deposition of submicron aerosols by a comparison of model results with available surface measurements. Annual mean surface concentrations are compared at 117 stations throughout the globe; seasonal variations are examined for 35 of these sites. The mean bias between simulated and measured yearly averaged surface concentrations is -2.7%, and the correlation coefficient is 0.80. The observed seasonal cycle and the annual mean concentrations are particularly well reproduced, although the model's poor vertical resolution does not capture the strong winter peak at some continental stations, nor the transport to Indian Ocean stations. Using the observed precipitation at or near the sites studied, we were able to explain a large part of the bias in model annual deposition. Deposition at coastal sites deserves also a special treatment since influenced by the land-ocean partition inherent to the model. When we represent correctly these coastal stations, we reduce the mean bias between observed and predicted annual deposition fluxes from 7.7% to 1.2% at 147 stations, and the correlation coefficient improves from 0.70 to 0.77.

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“…After the moratorium on the atmospheric nuclear weapon tests in the 1970ties and the decrease in concentrations of ceasium released in the atmosphere during the Chernobyl nuclear plant accident in 1986 due to its migration into deeper layers of soils, concentrations of 137 Cs in ground level air in the 1990ties were of order of µBq/m 3 . The concentration pattern was exhibiting one or two maxima in summers and winters, the summer maxima due to stratosphere to troposphere air exchange and the winter one due to soil dust resuspension in air (Cannizzaro et al, 1995;Larsen et al, 1995;Todorovic et al, 1997).…”

Section: Air Radioactivity Monitoringmentioning

confidence: 99%

“…In the last decade, air radioactivity monitoring in urban areas is a part of the pollution monitoring program in most of the European countries. In Serbia, there are many studies on the natural and anthropogenic radinuclides in ground level air but still there is no comprehensive database on the air radioactivity in the central city areas and the monitoring program started only recently (Manic et al, 2006;Popovic et al, 1996;Popovic et al, 1996a;Todorovic et al, 2007;Popovic et al, 2000a). 15x10 3 m 3 ).…”

Section: Air Radioactivity Monitoring Program In Belgrade Central Citmentioning

confidence: 99%