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| Titel |
Zonal asymmetries in middle atmospheric ozone and water vapour derived from Odin satellite data 2001–2010 |
| VerfasserIn |
A. Gabriel, H. Körnich, S. Lossow, D. H. W. Peters, J. Urban, D. Murtagh |
| 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 ; 11, no. 18 ; Nr. 11, no. 18 (2011-09-26), S.9865-9885 |
| Datensatznummer |
250010100
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| Publikation (Nr.) |
 copernicus.org/acp-11-9865-2011.pdf |
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| Zusammenfassung |
| Stationary wave patterns in middle atmospheric ozone (O3) and water
vapour (H2O) are an important factor in the atmospheric circulation, but
there is a strong gap in diagnosing and understanding their configuration and
origin. Based on Odin satellite data from 2001 to 2010 we investigate the
stationary wave patterns in O3 and H2O as indicated by the seasonal
long-term means of the zonally asymmetric components
O3* = O3-[O3] and
H2O* = H2O-[H2O] ([O3], [H2O]: zonal
means). At mid- and polar latitudes we find a pronounced wave one pattern in
both constituents. In the Northern Hemisphere, the wave patterns increase
during autumn, maintain their strength during winter and decay during spring,
with maximum amplitudes of about 10–20 % of the zonal mean values. During
winter, the wave one in O3* shows a maximum over the North
Pacific/Aleutians and a minimum over the North Atlantic/Northern Europe and a
double-peak structure with enhanced amplitude in the lower and in the upper
stratosphere. The wave one in H2O* extends from the lower
stratosphere to the upper mesosphere with a westward shift in phase with
increasing height including a jump in phase at upper stratosphere altitudes.
In the Southern Hemisphere, similar wave patterns occur mainly during
southern spring. By comparing the observed wave patterns in O3* and
H2O* with a linear solution of a steady-state transport equation
for a zonally asymmetric tracer component we find that these wave patterns
are primarily due to zonally asymmetric transport by geostrophically balanced
winds, which are derived from observed temperature profiles. In addition
temperature-dependent photochemistry contributes substantially to the spatial
structure of the wave pattern in O3* . Further influences, e.g., zonal
asymmetries in eddy mixing processes, are discussed. |
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