Mathematics – Logic
Scientific paper
Dec 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsa31b1735p&link_type=abstract
American Geophysical Union, Fall Meeting 2010, abstract #SA31B-1735
Mathematics
Logic
[0300] Atmospheric Composition And Structure, [0305] Atmospheric Composition And Structure / Aerosols And Particles, [0368] Atmospheric Composition And Structure / Troposphere: Constituent Transport And Chemistry
Scientific paper
We report the first measurement of cosmogenically produced radionuclide 35S activity in sulfate aerosols collected at inland (Dome C: latitude 75.6, longitude 123.24, altitude 3233 m) and coastal site (Dumont D’Urville: latitude 66.39, longitude 140.01, altitude 43 m) in Antarctica. Sulfate aerosol samples were collected using a High-Volume aerosol sampler on a glass fiber filter paper for 7 days once a month for a year. The radioactivity was measured using low noise liquid scintillation spectrometer1.The measurements reveal a maximum abundance of 35SO4 in spring-summer (500-1200 35S atoms/m3) and minimum (50-200 atoms/m3) during winter. This variation is explained by considering the relative seasonality of the air circulation patterns prevailing at inland and the costal sites. Tropospheric-stratospheric air mixing in summer leads to higher 35SO4, whereas a lack of mixing within the winter polar vortex causes a significant decrease in 35SO4. The 35S activity was found to be higher in fine sulfate aerosol particle (PM 2.5) as compared to coarse (PM10) at DDU. The normalised activity, the ratio of 35SO4 to the total sulfate concentration, shows no link of 35SO4 (or activity) concentration to the local meteorological conditions responsible for sulfate aerosol formation. Rather, the observed high value indicates higher air mass mixing between the stratosphere and troposphere. A secondary 35SO4 peak is observed at both stations during July and August. Based on a preliminary model, an additional 4-6% stratospheric contribution, either due to the stratospheric air mass intrusion into the troposphere or evaporation of 35SO4 from cloud particles during Polar Stratospheric Cloud sedimentation is required to explain this enhancement during the polar winter. 1 Brother, L.A., G. Dominguez, A. Abramian, A. Corbin, Ben Bluen, and M. H. Thiemens, Otimized low-level liquid scintillation spectroscopy of 35S for atmospheric and biogeochemical chemistry applications, Proceedings National Acad. Sci. 107, 5311, 2010
Pandey Abhishek
Savarino J. P.
Thiemens Mark H.
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