 |
| Titel |
Observation of mixing above the 370 K-isentrope during TACTS 2012 |
| VerfasserIn |
Stefan Mueller, Heiko Bozem, Andreas Zahn, Ellen Gute, Horst Fischer, Peter Hoor |
| Konferenz |
EGU General Assembly 2013
|
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 15 (2013) |
| Datensatznummer |
250072041
|
|
|
|
|
|
| Zusammenfassung |
| During the measurement campaign TACTS (Transport and Composition in the Upper
Troposphere/Lowermost Stratosphere) in August and September 2012, several flights with
the new German research aircraft HALO (High Altitude and Long Range Research
Aircraft) were performed over Europe and Northern Africa. In-situ measurements of
CO2, CO, N2O and CH4 were carried out with a QCL-spectrometer to investigate
dynamic processes in the UTLS-region up to 15 km. We focus on the survey of
a trough over the Eastern Atlantic in the last week of August. A first analysis of
the measurement data shows minimum CO and N2O values of less than 22 ppbv
and 301 ppbv, respectively indicating chemically aged / processed stratospheric
air.
Tracer-tracer-correlations with ozone show regions of mixing above the 370 K-isentrope
extending up to 400 K. These filamented structures are associated with a baroclinic wave
breaking event, which transports air of tropical origin deep into the extratropical lowermost
stratosphere above 370 K. Further analysis of the synoptic situation gives additional
information on the origin of the evaluated air masses and their pathway into the stratosphere. |
|
|
|
|
|
|