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| Titel |
Identification of transport pathways using modeled and observed CO-O3 correlations |
| VerfasserIn |
B. Vogel, P. Konopka, E. Atlas, K. P. Bowman, T. Campos, B. Hall, R. Müller, I. Pollack, A. Weinheimer, L. Pan |
| Konferenz |
EGU General Assembly 2009
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 11 (2009) |
| Datensatznummer |
250022673
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| Zusammenfassung |
| To better understand and characterize the transport pathways of air masses from the Earth’s
surface in the extra-tropical tropopause region the Stratosphere-Troposphere Analyses of
Regional Transport (START08) experiment was developed by the NCAR UTLS initiative in
collaboration with colleagues from several universities. Here we present a model study
based on measurements conducted during two START08 flights. These flights are
performed to study a tropospheric intrusion on April 18th, 2008 and a stratospheric
intrusion on April 28th, 2008 over Central USA. To analyze the measurements we use
the chemistry-transport model CLaMS. CLaMS is based on a unique Lagrangian
formulation of the tracer transport. In CLaMS a deformation driven mixing scheme is
implemented, which allows to simulated tracer correlations in the vicinity of the tropopause.
Using artificial tracers that mark particular regions in the atmosphere allows to
investigate the contribution of air mass origin in every individual CLaMS air parcel.
Thus CLaMS identifies the degree of mixing between certain air masses since the
beginning of the model simulation. A CLaMS simulation was performed for April
and May 2008. In CO-O3 correlations we found in both the measurements and the
simulations that different mixing lines and regions occurred depending on the origin of
the air masses. We connect these lines to different transport pathways of the air
masses across the tropopause depending on their location related to the jet streams. In
particular evidences of deep tropospheric intrusions into the lowermost stratosphere
could be found both in measured CO-O3 correlations and in CLaMS simulations. |
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