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| Titel |
36Cl bomb peak: comparison of modeled and measured data |
| VerfasserIn |
U. Heikkilä, J. Beer, J. Feichter, V. Alfimov, H.-A. Synal, U. Schotterer, A. Eichler  , M. Schwikowski, L. Thompson |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 9, no. 12 ; Nr. 9, no. 12 (2009-06-23), S.4145-4156 |
| Datensatznummer |
250007441
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| Publikation (Nr.) |
 copernicus.org/acp-9-4145-2009.pdf |
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| Zusammenfassung |
| The extensive nuclear bomb testing of the fifties and sixties and the final
tests in the seventies caused a strong 36Cl peak that has been observed
in ice cores world-wide. The measured 36Cl deposition fluxes in eight
ice cores (Dye3, Fiescherhorn, Grenzgletscher, Guliya, Huascarán, North
GRIP, Inylchek (Tien Shan) and Berkner Island) were compared with an
ECHAM5-HAM general circulation model simulation (1952–1972). We find a good
agreement between the measured and the modeled 36Cl fluxes assuming that
the bomb test produced global 36Cl input was ~80 kg. The model
simulation indicates that the fallout of the bomb test produced 36Cl is
largest in the subtropics and mid-latitudes due to the strong
stratosphere-troposphere exchange. In Greenland the 36Cl bomb signal is
quite large due to the relatively high precipitation rate. In Antarctica the
36Cl bomb peak is small but is visible even in the driest areas. The
model suggests that the large bomb tests in the Northern Hemisphere are
visible around the globe but the later (end of sixties and early seventies)
smaller tests in the Southern Hemisphere are much less visible in the
Northern Hemisphere. The question of how rapidly and to what extent the bomb
produced 36Cl is mixed between the hemispheres depends on the season of
the bomb test. The model results give an estimate of the amplitude of the
bomb peak around the globe. |
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