Giannakaki, Eleni

Hoffmann, Anne

Immler, Franz

Kivi, Rigel

Komppula, Mika

Schrems, Otto

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Geophysical Research AbstractsVol. 15, EGU2013-8356, 2013EGU General Assembly 2013© Author(s) 2013. CC Attribution 3.0 License.Polar stratospheric clouds over Finland in the 2012/2013 Arctic wintermeasured by two Raman lidarsAnne Hoffmann (1), Eleni Giannakaki (1), Rigel Kivi (2), Otto Schrems (3,4), Franz Immler (5), and MikaKomppula (1)(1) Finnish Meteorological Institute, Kuopio Unit, Kuopio, Finland (mika.komppula@fmi.fi), (2) Finnish MeteorologicalInstitute, Arctic Research Centre, Sodankylä, Finland, (3) Department of Chemistry, University of Bremen, Bremen, Germany,(4) Alfred Wegener Institute for Polar and Marine Research, Bremerhaven, Germany, (5) European Commission, DGResearch and Innovation, Brussels, BelgiumAlready in December 2012, the Arctic stratospheric vortex reached temperatures sufficiently low for polarstratospheric cloud (PSC) formation over wide areas of Northern Europe and whole Finland. Within Finland,stratospheric aerosol lidar measurements have been and are performed with two Raman lidar systems, the PollyXT,owned by the Finnish Meteorological Institute (FMI) and situated well below the Arctic circle close to Kuopio(63 N, 27 E) and the MARL lidar owned by the Alfred-Wegener-Institute for Polar and Marine Research (AWI),and situated at the FMI Arctic Research Centre in Sodankylä (67 N, 26 E). The PollyXT has been designed as anautonomous tropospheric lidar system, but it has proven to be able to detect aerosol backscatter and depolarizationat least as high up as 25 km.Measurements are ongoing as far as low clouds allow for stratospheric analysis with both lidars until theend of PSC season in February. For the winter 2012/2013, PSC occurrence frequency, types and characteristicswill be determined. Comparative analysis with Calipso lidar profiles covering Finland will be performed.Preliminary results from December 17-24 show PSCs detected in Kuopio during seven days with the Pol-lyXT lidar. The altitude of the clouds varied in the range of 17-25 km. In Sodankylä the measurements wererunning on one day during the period and PSCs were observed between altitudes 17-25 km. For the same timeperiod (December 17-24, 2012) CALIPSO has observed stratospheric layers at all overpasses over Finland (9tracks on five days). The clouds were observed between 18.5 and 26 km, with varying geometric and opticalthickness.

Polar Stratospheric clouds over Finland in the 2012/2013 Arctic winter measured by two Raman lidars

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