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| Titel |
Relationships among Brewer-Dobson circulation, double tropopauses, ozone and lower-stratospheric water vapor |
| VerfasserIn |
J. M. Castanheira, T. R. Peevey, C. A. F. Marques, M. A. Olsen |
| Konferenz |
EGU General Assembly 2012
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 14 (2012) |
| Datensatznummer |
250070921
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| Zusammenfassung |
| This communication will discuss the statistical relationships between the variability of the
area covered by double tropopause events and the variabilities of total column ozone and of
lower-stratospheric water vapor. The QBO signal in double tropopause events statistics and
the relationship between tropical upwelling and the near global (50oS - 50oN) lower
stratospheric water vapour will be also presented. The analysis is based on both reanalysis
data (ERA-Interim) and satellite data.
Significant correlations were found between the area covered by double tropopause events
in the latitudinal band 20 - 65oN and the gradient of total column ozone in the subtropical
Northern Hemisphere. Significant correlations were also found between de global area of
double tropopause events and the near global (50oS - 50oN) water vapour in the lower
stratosphere.
The relationship between double tropopause events and lower stratospheric ozone is
detailed by a correlation analysis between the frequencies of ozone laminae and double
tropopause events as found in the HIRDLS data.
The correlations of DT variables with total column ozone and ozone laminae are both
consistent with intrusion events of tropospheric tropical air into the lower extratropical
stratosphere, with the tropical tropopause overlaying the extratropical one. The poleward
excursions of the tropical tropopause are also consistent with the found negative correlation
between the area extension of DTs and the near global lower stratospheric water
vapour.
Finally, we will show the existence of a significant negative correlation between the
tropical upwelling, determined using the ”downward control principle”, and the near global
lower stratospheric water vapor. |
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