Vertical distribution, seasonality and troposphericity of ice-supersaturated air masses in the northern mid-latitudes from regular in-situ observations by passenger aircraft
- Publication type:
- Other
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- Abstract
- <jats:p> &lt;p&gt;The vertical distribution and seasonal variation of water vapour volume mixing ratio (H&lt;sub&gt;2&lt;/sub&gt;O VMR), relative humidity with respect to ice (RH&lt;sub&gt;ice&lt;/sub&gt;) and particularly of regions with ice-supersaturated air masses (ISSR) in the extratropical upper troposphere and lowermost stratosphere are investigated at northern mid-latitudes over the regions Eastern North America, the North Atlantic and Europe for the period 1995 to 2010.&lt;/p&gt;&lt;p&gt;Observation data originate from regular and continuous long-term measurements of H&lt;sub&gt;2&lt;/sub&gt;O VMR, temperature and RH&lt;sub&gt;ice&lt;/sub&gt; by instrumented passenger aircraft in the framework of the European research program MOZAIC which is continued as European research infrastructure IAGOS (from 2011; see www.iagos.org). The observation data are analysed with respect to the thermal and dynamical tropopauses, as provided by ERA-Interim. Additionally, collocated O&lt;sub&gt;3&lt;/sub&gt; observations from MOZAIC are used as tracer for stratospheric air masses.&lt;/p&gt;&lt;p&gt;Our key results provide in-depth insight into seasonal and regional variability and tropospheric nature of ice-supersaturated air masses at various distances from the tropopause layer. For the vertical distribution and seasonal variation of ISSR occurrence we show a comparison of our results to radio soundings and to satellite observations of cirrus cloud occurrence from AIRS and TOVs Path B instruments. Finally, for all three regions, we investigate the trends and the dependencies of ISSR occurrence on the North Atlantic Oscillation (NAO) index.&lt;/p&gt; </jats:p>
- Autoren
- Andreas Petzold
- Susanne Rohs
- Mihal Rütimann
- Patrick Neis
- Berkes Florian
- Smit Herman
- Krämer Martina
- Spelten Nicole
- Spichtinger Peter
- Nedelec Philippe
- Wahner Andreas
- DOI
- 10.5194/egusphere-egu2020-8992
- Buchtitel
- Copernicus GmbH
- Datum der Veröffentlichung
- 2020
- Status
- Published
- Herausgeber URL
- http://dx.doi.org/10.5194/egusphere-egu2020-8992
- Datum der Datenerfassung
- 2020
- Titel
- Vertical distribution, seasonality and troposphericity of ice-supersaturated air masses in the northern mid-latitudes from regular in-situ observations by passenger aircraft
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