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| Titel |
Gravitational separation in the stratosphere – a new indicator of atmospheric circulation |
| VerfasserIn |
S. Ishidoya, S. Sugawara, S. Morimoto, S. Aoki, T. Nakazawa, H. Honda, S. Murayama |
| 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 ; 13, no. 17 ; Nr. 13, no. 17 (2013-09-03), S.8787-8796 |
| Datensatznummer |
250085671
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| Publikation (Nr.) |
 copernicus.org/acp-13-8787-2013.pdf |
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| Zusammenfassung |
| As a basic understanding of the dynamics of the atmospheric circulation, it
has been believed that gravitational separation of atmospheric components is
observable only in the atmosphere above the turbopause. However, we found,
from our high-precision measurements of not only the isotopic ratios of
N2, O2 and Ar but also the mole fraction of Ar, that gravitational
separation occurs even in the stratosphere below the turbopause; their
observed vertical profiles are in good agreement with those expected
theoretically from molecular mass differences. The O2/N2 ratio
observed in the middle stratosphere, corrected for gravitational separation,
showed the same mean air age as estimated from the CO2 mole fraction.
Simulations with a 2-dimensional model of the middle atmosphere indicated
that a relationship between gravitational separation and the age of air in
the stratosphere would be significantly affected if the Brewer–Dobson
circulation was enhanced due to global warming. Therefore, gravitational
separation is usable as a new indicator of changes in the atmospheric
circulation in the stratosphere. |
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