首页|Continuous 25-yr aerosol records at coastal Antarctica Part 2: variability of the radionuclides ~7Be, ~(10)Be and ~(210)Pb
Continuous 25-yr aerosol records at coastal Antarctica Part 2: variability of the radionuclides ~7Be, ~(10)Be and ~(210)Pb
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NSTL
Taylor & Francis
We investigated the variability of ~(210)Pb, 7Be and 10Be in coastal Antarctic aerosol samples based on continuous,monthly and annually resolved time series obtained from Neumayer Station over the period 1983 to 2008. Clear seasonal cycles peaking in the local summer half year stand out as a common feature of all three radionuclide records. Time series analyses suggest that significant multiannual changes are confined to a 4–6 yr periodicity resembling that of the Southern Annual Mode index in case of ~(210)Pb and to the expected decadal solar cycle in case of the cosmogenic Be-isotopes. Both, changes in the meridional transport and surface inversion strength appear to drive the seasonal ~(210)Pb cycle, which generally peaks in November. In contrast, stratospheric air mass intrusions are proved to be the main reason for the Be-isotopes seasonality. This finding is revealed by enhanced ~(10)Be/~7Be ratios occurring during late summer / early autumn broadly concurrently with the individual Be-isotopes and the ~7Be/~(210)Pb ratio. The ~(10)Be and ~7Be records clearly reflect the decadal, solar-modulated production signal but, for unknown reasons, they substantially differ in their detailed pattern. It is ruled out, that an excess ~7Be production by solar energetic particles was responsible for this mismatch.
aerosolAntarcticaradionuclides
CHRISTOPH ELSASSER、DIETMAR WAGENBACH、ROLF WELLER、MATTHIAS AUER、ANTON WALLNER、MARCUS CHRISTL
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Institut fur Umweltphysik,University of Heidelberg, Im Neuenheimer Feld 229, D-69120 Heidelberg, Germany
Alfred Wegener Institute for Polar and Marine Research, D-27570 Bremerhaven, Germany
Vienna Environmental Research Accelerator,University of Vienna, A-1090 Vienna, Austria
NSTL
Taylor & Francis
