Abstract
Routine high-quality lidar measurements of ozone, water vapour and aerosol at Garmisch-Partenkirchen since 2007 have made possible more comprehensive atmospheric studies and lead to a growing insight concerning the most frequently occurring long-range transport pathways. In this contribution we present as examples results on stratospheric layers travelling in the free troposphere for extended periods of time without eroding. In particular, we present a case of an intrusion layer that subsided over as many as fifteen days and survived the interference by strong Canadian fires. These results impose a challenge on atmospheric modelling that grossly overestimates free-tropospheric mixing.
Highlights
Differential absorption lidar (DIAL) methods have been applied in numerous atmospheric process and air-quality studies [
In the GarmischPartenkirchen area (Bavarian Alps, Germany) IMK-IFU has developed three DIAL systems for ozone and water vapour [2,3,4,5] that have been extensively used in focussed atmospheric investigations
Three ranges of travel times are distinguished by estimates from four-day forward trajectory plots daily received for stratospheric intrusion forecasts [12,13,14] and from 315-h backward runs with the HYSPLIT trajectory model
Summary
Differential absorption lidar (DIAL) methods have been applied in numerous atmospheric process and air-quality studies [. Routine high-quality lidar measurements of ozone, water vapour and aerosol at GarmischPartenkirchen since 2007 have made possible more comprehensive atmospheric studies and lead to a growing insight concerning the most frequently occurring long-range transport pathways. In this contribution we present as examples results on stratospheric layers travelling in the free troposphere for extended periods of time without eroding.
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