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| Titel |
Mid-latitude tropospheric ozone columns from the MOZAIC program: climatology and interannual variability |
| VerfasserIn |
R. M. Zbinden, J.-P. Cammas, V. Thouret, P. Nédélec, F. Karcher, P. Simon |
| 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 ; 6, no. 4 ; Nr. 6, no. 4 (2006-03-31), S.1053-1073 |
| Datensatznummer |
250003630
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| Publikation (Nr.) |
 copernicus.org/acp-6-1053-2006.pdf |
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| Zusammenfassung |
| Several thousands of ozone vertical profiles collected in the course of the
MOZAIC programme (Measurements of Ozone, Water Vapour, Carbon Monoxide and
Nitrogen Oxides by In-Service Airbus Aircraft) from August 1994 to February
2002 are investigated to bring out climatological and interannual variability
aspects. The study is centred on the most frequently visited MOZAIC airports,
i.e. Frankfurt (Germany), Paris (France), New York (USA) and the cluster of
Tokyo, Nagoya and Osaka (Japan). The analysis focuses on the vertical
integration of ozone from the ground to the dynamical tropopause and the
vertical integration of stratospheric-origin ozone throughout the
troposphere. The characteristics of the MOZAIC profiles: frequency of
flights, accuracy, precision, and depth of the troposphere observed, are
presented. The climatological analysis shows that the Tropospheric Ozone
Column (TOC) seasonal cycle ranges from a wintertime minimum at all four
stations to a spring-summer maximum in Frankfurt, Paris, and New York. Over
Japan, the maximum occurs in spring presumably because of the earlier
springtime sun. The incursion of monsoon air masses into the boundary layer
and into the mid troposphere then steeply diminishes the summertime value.
Boundary layer contributions to the TOC are 10% higher in New York than
in Frankfurt and Paris during spring and summer, and are 10% higher in
Japan than in New York, Frankfurt and Paris during autumn and early spring.
Local and remote anthropogenic emissions, and biomass burning over upstream
regions of Asia may be responsible for the larger low- and mid-tropospheric
contributions to the tropospheric ozone column over Japan throughout the year
except during the summer-monsoon season. A simple Lagrangian analysis has
shown that a minimum of 10% of the TOC is of stratospheric-origin
throughout the year. Investigation of the short-term trends of the TOC over
the period 1995–2001 shows a linear increase 0.7%/year in Frankfurt,
0.8%/year in Japan, 1.1%/year in New York and 1.6%/year in Paris for
the reduced 1995–1999 period. Dominant ingredients of these positive
short-term trends are the continuous increase of wintertime tropospheric
ozone columns from 1996 to 1999 and the positive contributions of the mid
troposphere whatever the season. |
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