Physics
Scientific paper
Dec 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufmsa14a..02b&link_type=abstract
American Geophysical Union, Fall Meeting 2007, abstract #SA14A-02
Physics
0305 Aerosols And Particles (0345, 4801, 4906), 0320 Cloud Physics And Chemistry, 0340 Middle Atmosphere: Composition And Chemistry
Scientific paper
The ALOMAR RMR-lidar located in Northern Norway at 69N is capable to observe noctilucent clouds (NLC) with three widely separated wavelengths (355nm, 532nm, 1064nm) since 1998. From the three color backscatter coefficients we can deduce the number density, size, and the width of the size distribution of the particles in the volume observed. The analysis procedure includes spherical and non spherical particles and is not affected by the unknown particle shape. The lidar sounds the clouds with a vertical resolution of about 150 m and allows to study the vertical variation of the particle properties. The vertical structure of NLC gives a unique chance to investigate the particle evaluation and test the micro physical parameterization in cloud models and our understanding of the particle growth process. For a statistical treatment the clouds are separated vertically into the peak layer and an upper and lower layer. We will present results on the mean vertical structure of particle properties, investigating the astonishing fact that the largest mean particle sizes are found below the peak of the layer, where one would expect the particles to melt. We compare the observations to the 3-d LIMA-ICE cloud model including the variability of the ambient atmosphere. Additionally we will investigate year to year variations of particle properties at the peak of the layer and cloud properties like the volume density and estimated ice mass.
Baumgarten Gerd
Berger Ulrich
Fiedler Jens
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