ST16 Stratosphere-troposphere-exchange (co-sponsored by OA) I

Convener: Wirth, V.
Co-Convener(s): Haynes, P.H.
Wednesday, 22 April 1998
Lecture Room: M6

Chairperson: Haynes, P.H.

1. Large-scale transport/exchange/processes
a) General circulation questions

• 08:45 PLUMB, R.A.
  Dynamics and transport in the lower stratosphere (Solicited Paper)
• 09:15 SIEGMUND, P.; VAN VELTHOVEN, P.; KELDER, H.
  The residual mean meridional circulation in the lower stratosphere, diagnosed from 15 years of ECMWF-reanalysis data
• 09:30 JUCKES, M.N.
  The meridional circulation in the lowermost stratosphere
• 09:45 CRAIG, G.C.; THUBURN, J.
  The radiative constraint on tropopause height

2. Chemical distributions in the lowermost stratosphere/tropopause region
a) Lowermost stratosphere

• 10:00 BORRMANN, S.
  Heterogenous chemistry in the tropopause region (Solicited Paper)
• 10:30 BREGMAN, A.; LELIEVELD, J.
  Mixing of tropospheric air into the mid-latitude stratosphere and its role in atmospheric chemsitry
• 10:45 EICKE, N.; BUJOK, O.; FISCHER, H.; MCKENNA, D.S.; SCHILLER, C.; SCHLAGER, H.; ZÖGER, M.
  The dry lowermost stratosphere in the arctic winter: evidence for local dehydration
• 11:00 ZAHN, A.; PLATT, U.
  Airborne CO2, CH4, O3 and SF6 measurements to study tracer transport around the tropopause
• 11:15 BÜHLER, S.A.; KÜNZI, K.
  Microwave limb-sounding of water vapour in the tropopause region
• 11:30 BUJOK, O.; EICKE, N.; ENGEL, A.; LELIEVELD, J.; MCKENNA, D.S.; SCHILLER, C.; ZÖGER, M.
  Experimental evidence for the existence of a very lowermost stratosphere
• 11:45 HESS, P.
  Analysis of the seasonal transport of ozone and water vapor into the lower stratosphere

12:00 LUNCH

12:00 Business Meetings

Chairperson: Borrmann, S.

b) Tropics/subtropics

• 14:00 WEINSTOCK, E.M.; HINTSA, E.J.; ANDERSON, J.G.; BOERING, K.A.; DAUBER, B.C.; WOFSY, S.C.; HERMAN, R.L.; MAY, R.D.; WEBSTER, C.R.
  Evaluation of the seasonal cycle of water vapor in the stratosphere derived from monthly average tropical tropopause temperatures using a CO photochemical clock (Solicited Paper)
• 14:30 SUHRE, K.; CAMMAS, J.-P.; NEDELEC, P.; ROSSET, R.; MARENCO, A.; SMIT, H.G.J.
  Ozone-rich transients in the upper equatorial Atlantic troposphere
• 14:45 DETHOF, A.; O'NEILL, A.; SLINGO, J.
  Water vapour transport associated with the Asian summer monsoon
• 15:00 CAMMAS, J.-P.; JACOBY-KOALY, S.; SUHRE, K.; ROSSET, R.; MARENCO, A.
  Stratosphere-troposphere exchange across the potential vorticity barrier of the subtropical jet as seen with MOZAIC-ozone measurement

Chairperson: Wirth, V.

3. Synoptic- and small-scale exchange/processes
a) Folds, laminae, relevant processes

• 15:15 MCKENNA, D.; LERNER, A.
  Observations of trace gases in the vicinity of a tropopause fold
• 15:30 MANCIER, C.; BEEKMANN, M.; ANCELLET, G.; MARENCO, A.
  Spatial and temporal variability of tropopause folds occurrence - implications for the cross tropospheric ozone flux
• 15:45 CAMMAS, J.-P.; RAVETTA, F.; ANCELLET, G.
  Life cycle of a tropopause fold
• 16:00 WORTHINGTON, R.M.; VAUGHAN, G.
  Case study of stratosphere troposphere exchange using VHF wind profiler, ozonesonde, radiosonde and E.C.M.W.F. data
• 16:15 FORSTER, C.; WIRTH, V.
  Radiative decay of stratospheric laminae in the troposphere

b) VOTALP

• 16:30 FELDMANN, H.; MEMMESHEIMER, M.; STOHL, A.; TRICKL, T.; BONASONI, P.; GAEGGELER, H.; GRABER, W.; KROMP-KOLB, H.
  VOTALP: observation and simulation of a stratospheric intrusion event over the Alps
• 16:45 ZANIS, P.; SCHUEPBACH, E.; GGGELER, H.W.; HBENER, S.; STOHL, A.
  A summer stratospheric intrusion event at Jungfraujoch (3,580 m ASL) in Switzerland

17:00 END OF PART I
 

ST16 Stratosphere-troposphere-exchange (co-sponsored by OA) II

Convener: Wirth, V.
Co-Convener(s): Haynes, P.H.
Thursday, 23 April 1998
Lecture Room: M6

Chairperson: Craig, G.C.

c) Various other case studies etc.

• 08:30 KOWOL-SANTEN, J.; RAVETTA, F.; EBEL, A.
  Analysis of transport and exchange processes in the tropopause region by means of Lagrangian methods
• 08:45 GOUGET, H.; VAUGHAN, G.
  Case study of a cut-off low during TOASTE-C campaign
• 09:00 RAVETTA, F.; ANCELLET, G.; KOWOL-SANTEN, J.
  Stratosphere-troposphere exchange within a cut-off low: airborne measurement campaign and mesoscale modelling
• 09:15 WIRTH, V.; EGGER, J.
  Diagnosing extratropical stratosphere-troposphere exchange: a case study
• 09:30 TAFFERNER, A.
  Stratosphere-troposphere exchange in a stratospheric intrusion
• 09:45 HEREIL, P.; VAN BAELEN, J.
  Nonhydrostatic numerical simulations and wind profilers observations of a cut-off low episode near the Alps
• 10:00 PERSSON, K.; NILSSON, H.; KIRKWOOD, S; CHILSON, P.
  Study of stratosphere troposphere exchange at high latitudes with MST radar and ozonesondes

10:15 BREAK

Chairperson: Hess, P.

• 10:45 SCHULZ-SCHÖLLHAMMER, K.; MARQUARDT, C.; SINGER, W.; HOFFMANN, P.
  A case study to identify layers with laminor or turbulent flows using ST radar and radiosonde observations and trajectory calculations
• 11:00 SINGER, W.; HOFFMANN, P.; KEUER, D.; CZECHOWSKY, P.
  Observations of the tropopause region above Andenes during the break up of the polar vortex in March 1995 with the ALOMAR SOUSY radar

1.b) GCMs

• 11:15 BOURQUI, M.; WERNLI, H.; BRUNNER, D.
  A climatology of stratosphere-troposphere ozone exchange for the Atlantic-European sector
• 11:30 MANZINI, E.; FEICHTER, J.
  Transport in the middle atmosphere (MA) ECHAM general circulation model
• 11:45 LAND, C.; FEICHTER, J.; SAUSEN, R.
  Transport simulations of natural tracers with the ECHAM GCM: sensitivity of stratosphere-troposphere exchange to the vertical resolution
• 12:00 TIMMRECK, C.
  Stratospheric-tropospheric-exchange: a Pinatubo case study
• 12:15 JACKSON, D.R.; PAMMENT, J.A.; METHVEN, J.; POPE, V.D.
  Transport in the low latitude tropopause region as simulated by the UK Meteorological Office Unified Model
• 12:30 PLANTEVIN, P.H.; SHALLCROSS, D.E.; LAW, K.S.; PYLE, J.A.
  Chemical impact on the troposphere of tropopause fold events during TOASTE campaigns
• 12:45 KENTARCHOS, A.; ROELOFS, G.J.; LELIEVELD, J.
  Simulation of a stratospheric intrusion event at subtropical latitudes using a coupled chemistry-general circulation model

13:00 LUNCH

Joint Session ST16/NP3.5 to continue in Lecture Room M3 at 14.00
 

Lecture Room: M3
Chairperson: Waugh, D.W.

4. Joint session ST16/NP3.5
a) Techniques such as RDF

• 14:00 MCKENNA, D.; BUJOK, O.; THOMAS, N.
  Comparison of RDF with in-situ data (Solicited Paper)
• 14:30 AMBAUM, M.; BUJOK, O.
  Correction for phase errors in lagrangian modelling of tracer filameters
• 14:45 BITHELL, M.; GRAY, L.J.
  Isentropic and three dimensional trajectories near the tropopause
• 15:00 METHVEN, J.; HOSKINS, B.
  On the advection of high resolution tracers by low resolution winds
• 15:15 MARIOTTI, A.; LEGRAS, B.; MECHOSO, C.R.
  Pseudo-contour advection with surgery

b) Studies using observed/model winds

• 15:30 SHUCKBURGH, E.
  Investigating transport across the tropopause
• 15:45 BAGLIANI, M.; FRAEDRICH, K.; VON HARDENBERG, J.; LUNKEIT, F.
  Lagrangian climatology of a simplified general circulation model
• 16:00 LAPEYRE, G.; LEGRAS, B.
  A criterion for the formation of filaments around the polar vortex
• 16:15 BRUNET, G.; GRAVEL, S.; ROCH, M.; GAUTHIER, P.; PELLERIN, S.; EK, N.; EDOUARD, S.
  High resolution forecasts of polar stratospheric ozone using the Canadian Global Environmental Multiscale Model

16:30 END OF PART II
 

ST16 Stratosphere-troposphere-exchange (co-sponsored by OA) III

Convener: Wirth, V.
Co-Convener(s): Haynes, P.H.
Friday, 24 April 1998
Lecture Room: M3

Chairperson: McKenna, D.

Joint ST16/NP3.5 session continued
c) Lower stratospheric tracer studies

• 08:30 WAUGH, D.W.
  Seasonal variation of stirring and mixing in the lower stratosphere (Solicited Paper)
• 09:00 ALFIER, R.; PAWSON, S.; KETELSEN, K.
  Fine structure of water vapour transport at the polar vortex
• 09:15 LEDER, S.; BECK, A.
  The relationship between the exchange across the subtropical barrier and planetary wave activity in a global model
• 09:30 GODIN, S.; BERGERET, V.; BEKKI, S.; DAVID, C.; HAUCHECORNE, A.
  Lidar aerosol measurements showing the stratified structure of the Antarctic polar votex in the spring of 1992
• 09:45 HAUCHECORNE, A.; GODIN, S.; SOUPRAYEN, C.
  Meridional transport of ozone in the lower stratosphere at middle latitudes: lidar observations and simulation with a high resolution advection model
• 10:00 ROZANOV, E.; ZUBOV, V.; SCHLESINGER, M.; YANG, F.; ANDRONOVA, N.
  Simulation of trace-gas distributions with the UIUC 3-D atmospheric chemical-transport model and comparison of source gas distributions with observations
• 10:15 CAHILL, M.; PLANTEVIN, P.H.; LAW, K.S.; SHALLCROSS, D.E.; CHIPPERFIELD, M.; EVANS, M.; PYLE, J.A.; GERBIG, C.; RICHER, H.; BAUGUITTE, S.; BANDY, B.; MILLS, G.; PENKETT, S.
  A comparison of flight measurements from summer '97 with TOMCAT

10:30 BREAK

End of Session ST16/Session NP3.5 to continue