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ASTAR - Arctic Study of Tropospheric Aerosols, Clouds and Radiation

gefördert durch DFG WE1900/8-1,2,3

Within the scope of the Arctic Study on Aerosol, Clouds and Radiation (ASTAR) the SMART-Albedometer was mounted on the research aircraft Polar 2 of the Alfred Wegener Institute for Polar and Marine Research (AWI). A detailed description of the instrument is given here. The measurements were conducted in April 2007 in Longyearbyen, Svalbard. Supported by simultaneous airborne microphysical measurements by the Laboratoire de Météorologie Physique, Clermont-Ferrand, France and airborne lidar measurements by AWI the optical properties of boundary layer mixed-phase clouds were derived. The measurements of the SMART-Albedometer were primarily used for detailied investigations on Arctic mixed-phase clouds:

• Identification of ice, mixed-phase and liquid water clouds from passive remote sensing techniques.

• Investigation on the vertical distribution of ice crystals and liquid water dropets within arctic mixed-phase clouds.

Further investigations are focussed on:

• Measurements of the spectral Albedo of snow and sea ice.

• Optical properties of subvisible midlevel ice clouds.

The research aircraft Polar 2 during a research flight above Spitsbergen/Svalbard. (copyright AWI)

Geographical location of Spitsbergen/Svalbard.

External Webpage of the ASTAR campaign

Information on Arctic mixed-phase clouds

Publications

2010

Lidar characterization of the Arctic atmosphere during ASTAR 2007: four cases studies of boundary layer, mixed-phase and multi-layer clouds, A. Lampert, C. Ritter, A. Hoffmann, J.-F. Gayet, G. Mioche, A. Ehrlich, A. Dörnbrack, M. Wendisch, and M. Shiobara Atmos. Chem. Phys. 10 (2010), 2847-2866 (pdf)

2009

Evidence of ice crystals at cloud top of Arctic boundary-layer mixed-phase clouds derived from airborne remote sensing, A. Ehrlich, M. Wendisch, E. Bierwirth, J.-F. Gayet, G. Mioche, A. Lampert, B. Mayer Atmos. Chem. Phys. 9 (2009), 9401-9416 (pdf)

Microphysical and optical properties of Arctic mixed-phase clouds. The 9 April 2007 case study., J.-F. Gayet, G. Mioche, A. Dörnbrack, A. Ehrlich, A. Lampert, and M. Wendisch, Atmos. Chem. Phys. 9, (2009), 6581-6595 (pdf)

Microphysical and radiative characterization of a subvisible midlevel Arctic ice cloud by airborne observations – a case study, A. Lampert, A. Ehrlich, A. Dörnbrack, O. Jourdan, J.-F. Gayet, G. Mioche, V. Shcherbakov, C. Ritter, M. Wendisch, Atmos. Chem. Phys. 9, (2009), 2647-2661 (pdf)

2008

Cloud phase identification of arctic boundary-layer clouds from airborne spectral reflection measurements: Test of three approaches, A. Ehrlich, E. Bierwirth, M. Wendisch, J.-F. Gayet, G. Mioche, A. Lampert, J. Heintzenberg, Atmos. Chem. Phys. 8 (2008), 7493-7505 (pdf)

Ice crystal shape effects on solar radiative properties of Arctic mixed-phase clouds - Dependence on microphysical properties, A. Ehrlich, M. Wendisch, E. Bierwirth, A. Herber, A. Schwarzenböck, Atmos. Res. 88 (2008), 266-276