ACP Atmospheric Chemistry and Physics ACP 1680-7324 Copernicus GmbH Göttingen, Germany 10.5194/acp-9-9059-2009 Ground-based lidar measurements from Ny-Ålesund during ASTAR 2007 Hoffmann A. 1 Ritter C. 1 Stock M. 1 Shiobara M. 2 Lampert A. 1 Maturilli M. 1 Orgis T. 1 Neuber R. 1 Herber A. 3 Alfred Wegener Institute for Polar and Marine Research in the Helmholtz Association, Telegrafenberg A 43, 14473 Potsdam, Germany National Institute of Polar Research, Kaga 1-9-10, Itabashi-ku, Tokyo, 190-8518 Japan Alfred Wegener Institute for Polar and Marine Research in the Helmholtz Association, Bürgermeister-Smidt-Straße 20, 27568 Bremerhaven, Germany 30 11 2009 9 22 9059 9081 This is an open-access article ditributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. This article is available from http://www.atmos-chem-phys.net/9/9059/2009/acp-9-9059-2009.html The full text article is available as a PDF file from http://www.atmos-chem-phys.net/9/9059/2009/acp-9-9059-2009.pdf

During the Arctic Study of Tropospheric Aerosol, Clouds and Radiation (ASTAR) in March and April 2007, measurements obtained at the AWIPEV Arctic Research Base in Ny-Ålesund, Spitsbergen at 78.9° N, 11.9° E (operated by the Alfred Wegener Institute for Polar and Marine Research – AWI and the Institut polaire français Paul-Emile Victor – IPEV), supported the airborne campaign. This included lidar data from the Koldewey Aerosol Raman Lidar (KARL) and the Micro Pulse Lidar (MPL), located in the atmospheric observatory as well as photometer data and the daily launched radiosonde. The MPL features nearly continuous measurements; the KARL was switched on whenever weather conditions allowed observations (145 h in 61 days). From 1 March to 30 April, 71 meteorological balloon soundings were performed and compared with the concurrent MPL measurements; photometer measurements are available from 18 March. For the KARL data, a statistical overview of particle detection based on their optical properties backscatter ratio and volume depolarization can be given. The altitudes of the occurrence of the named features (subvisible and visible ice and water as well as mixed-phase clouds, aerosol layers) as well as their dependence on different air mass origins are analyzed. Although the spring 2007 was characterized by rather clean conditions, diverse case studies of cloud and aerosol occurrence during March and April 2007 are presented in more detail, including temporal development and main optical properties as depolarization, backscatter and extinction coefficients. Links between air mass origins and optical properties can be presumed but need further evidence.

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