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Volume 16, issue 12 | Copyright

Special issue: CHemistry and AeRosols Mediterranean EXperiments (ChArMEx)...

Atmos. Chem. Phys., 16, 8023-8042, 2016
https://doi.org/10.5194/acp-16-8023-2016
© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.

Research article 01 Jul 2016

Research article | 01 Jul 2016

Gravity-wave effects on tracer gases and stratospheric aerosol concentrations during the 2013 ChArMEx campaign

Fabrice Chane Ming1, Damien Vignelles2, Fabrice Jegou2, Gwenael Berthet2, Jean-Baptiste Renard2, François Gheusi3, and Yuriy Kuleshov4,5,6,7 Fabrice Chane Ming et al.
  • 1Université de la Réunion, Laboratoire de l'Atmosphère et des Cyclones, UMR8105, UMR CNRS-Météo France-Université, La Réunion, France
  • 2CNRS, LPC2E, UMR 7328, CNRS/Université d'Orléans, Orléans, France
  • 3Laboratoire d'Aérologie, UMR5560, Université de Toulouse and CNRS, Toulouse, France
  • 4Bureau of Meteorology, Melbourne, Australia
  • 5School of Science, RMIT University, Melbourne, Australia
  • 6Faculty of Science, Engineering and Technology, Swinburne University, Melbourne, Australia
  • 7School of Mathematics and Statistics, Melbourne University, Melbourne, Australia

Abstract. Coupled balloon-borne observations of Light Optical Aerosol Counter (LOAC), M10 meteorological global positioning system (GPS) sondes, ozonesondes, and GPS radio occultation data, are examined to identify gravity-wave (GW)-induced fluctuations on tracer gases and on the vertical distribution of stratospheric aerosol concentrations during the 2013 ChArMEx (Chemistry-Aerosol Mediterranean Experiment) campaign. Observations reveal signatures of GWs with short vertical wavelengths less than 4km in dynamical parameters and tracer constituents, which are also correlated with the presence of thin layers of strong local enhancements of aerosol concentrations in the upper troposphere and the lower stratosphere. In particular, this is evident from a case study above Ile du Levant (43.02°N, 6.46°E) on 26–29 July 2013. Observations show a strong activity of dominant mesoscale inertia GWs with horizontal and vertical wavelengths of 370–510km and 2–3km respectively, and periods of 10–13h propagating southward at altitudes of 13–20km during 27–28 July. The European Centre for Medium-Range Weather Forecasts (ECMWF) analyses also show evidence of mesoscale inertia GWs with similar horizontal characteristics above the eastern part of France. Ray-tracing experiments indicate the jet-front system as the main source of observed GWs. Using a simplified linear GW theory, synthetic vertical profiles of dynamical parameters with large stratospheric vertical wind maximum oscillations of ±40mms−1 are produced for the dominant mesoscale GW observed at heights of 13–20km. Parcel advection method reveals signatures of GWs in the ozone mixing ratio and the tropospheric-specific humidity. Simulated vertical wind perturbations of the dominant GWs and small-scale perturbations of aerosol concentration (aerosol size of 0.2–0.7µm) are revealed to be in phase in the lower stratosphere. Present results support the importance of vertical wind perturbations in the GW–aerosol relationship. Observed mesoscale GWs induce a strong modulation of the amplitude of tracer gases and the stratospheric aerosol background.

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Coupled balloon-borne observations of Light Optical Aerosol Counter (LOAC), M10 meteorological GPS sondes, ozonesondes, and GPS radio occultation data are examined to identify gravity-wave (GW)-induced fluctuations on tracer gases and on the vertical distribution of stratospheric aerosol concentrations during the 2013 ChArMEx campaign. Observed mesoscale GWs induce a strong modulation of the amplitude of tracer gases and the stratospheric aerosol background.
Coupled balloon-borne observations of Light Optical Aerosol Counter (LOAC), M10 meteorological...
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