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23 Jan 2007
Status : this preprint was under review for the journal ACP. A revision for further review has not been submitted.
Evidence of tropospheric layering: interleaved stratospheric and planetary boundary layer intrusions
J. Brioude , J.-P. Cammas , R. M. Zbinden , and V. Thouret
We present a case study of interleaving in the free troposphere of 4 layers of non-tropospheric origin, with emphasis on their residence time in the troposphere. Two layers are stratospheric intrusions at 4.7 and 2.2 km altitude with residence times of about 2 and 6.5 days, respectively. The two other layers at 7 and 3 km altitude were extracted from the maritime planetary boundary layer by warm conveyor belts associated with two extratropical lows and have residence times of about 2 and 5.75 days, respectively. The event took place over Frankfurt (Germany) in February 2002 and was observed by a commercial airliner from the MOZAIC programme with measurements of ozone, carbon monoxide and water vapour. Origins and residence times in the troposphere of these layers are documented with a trajectory and particle dispersion model. The combination of forward and backward simulations of the Lagrangian model allows the period of time during which the residence time can be assessed to be longer, as shown by the capture of the stratospheric-origin signature of the lowest tropopause fold just about to be completely mixed above the planetary boundary layer. This case study is of interest for atmospheric chemistry because it emphasizes the importance of coherent airstreams that produce laminae in the free troposphere and that contribute to the average tropospheric ozone. The interleaving of these 4 layers also provides the conditions for a valuable case study for the validation of global chemistry transport models used to perform tropospheric ozone budgets.
Received: 04 Oct 2006 – Discussion started: 23 Jan 2007
J. Brioude , J.-P. Cammas , R. M. Zbinden , and V. Thouret
Status: closed (peer review stopped)
Status: closed (peer review stopped)
AC : Author comment | RC : Referee comment | SC : Short comment | EC : Editor comment
- Printer-friendly version
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Status: closed (peer review stopped)
Status: closed (peer review stopped)
AC : Author comment | RC : Referee comment | SC : Short comment | EC : Editor comment
- Printer-friendly version
- Supplement
J. Brioude , J.-P. Cammas , R. M. Zbinden , and V. Thouret
J. Brioude , J.-P. Cammas , R. M. Zbinden , and V. Thouret
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