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| Titel |
Distribution of chemical compounds observed in the UTLS during the TACTS campaign using the HALO aircraft |
| VerfasserIn |
Timo Keber, Harald Boenisch, Andreas Engel, Peter Hoor, Heiko Bozem, Stefan Müller, Andreas Zahn, Martina Krämer, Nicole Spelten |
| Konferenz |
EGU General Assembly 2014
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 16 (2014) |
| Datensatznummer |
250096381
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| Publikation (Nr.) |
 EGU/EGU2014-11881.pdf |
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| Zusammenfassung |
| The SPURT (Spurenstofftransport in der Tropopausenregion, trace gas transport in the
tropopause region) campaign was the first systematic observational study of extratropical
Upper Troposphere / Lower Stratosphere (UTLS) seasonality. A clear seasonality of the
composition in and air mass transport into the lowermost stratosphere (LMS) was found. In
particular the composition of the LMS showed a sharp transition between July and October.
In the course of the summer the LMS is flushed with very young air indicating air mass
transport via the tropical pathway.
For further investigation of these findings the TACTS (Transport and Composition in the
UT/LMS) campaign was designed to improve our understanding of transport timescales,
compositions and pathways in the UTLS region during the transition between mid-summer
and fall. In order to cover the seasonal transition, TACTS was flown in conjunction with the
ESMVal (Earth System Model Validation) mission in late August and September 2012 using
the new German research aircraft HALO (The High Altitude and LOng Range Research
Aircraft). The TACTS payload with 13 different instruments measuring a wide range of
chemical tracers with different lifetimes and different source-sink characteristics provides
additional information compared to the SPURT dataset (e.g. very short-lived (VSLS)
halocarbons).
We will present a comparison between the SPURT dataset and the in-situ measurements
during the TACTS campaign. The main focus will be on a comparison of the observed
distribution of nitrous oxide (N2O), water vapour, ozone and mean age derived from
sulfurhexafluoride (SF6) as function of equivalent latitude and potential temperature. Also
comparison of Tracer-Tracer correlations will be shown.
Furthermore we discuss the additional information on transport timescale in
the LMS provided by the measurements of very short-lived (VSLS) halocarbons. |
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