Physics
Scientific paper
Dec 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsa33c..04b&link_type=abstract
American Geophysical Union, Fall Meeting 2008, abstract #SA33C-04
Physics
0305 Aerosols And Particles (0345, 4801, 4906), 0320 Cloud Physics And Chemistry, 0340 Middle Atmosphere: Composition And Chemistry, 0394 Instruments And Techniques, 4801 Aerosols (0305, 4906)
Scientific paper
Noctilucent clouds (NLC) are the visible manifestation of icy particles persistently present in the polar summer mesopause region. Their formation is a rather complicated physical process depending on atmospheric background parameters, such as temperature and water vapor, which are highly variable and hardly to measure directly at the altitudes of interest. The strong dependence on the atmospheric parameters and the fact that the clouds show variabilities at different time scales from minutes to several years make NLC an attractive tracer. The ALOMAR RMR-lidar, located in Northern Norway at 69N, is capable to observe NLC on a regular basis since 1997. Using the most sensitive wavelength of the lidar at 532nm, we have observed NLC signatures covering all local times. From the observations basic cloud parameters like brightness, altitude and occurrence frequency are derived. From the backscatter coefficients of three widely separated wavelengths (355nm, 532nm, 1064nm) we deduce particle properties like number density and size of the particles. Additionally the width of the size distribution of NLC particles is deduced. The combination of basic cloud parameters and microphysical particle properties allows detailed studies of the observed variations and helps to understand the physical processes involved. We investigate and compare variations from hourly to seasonal time scales as contained in our 12-years data set.
Baumgarten Gerd
Fiedler Jens
Luebken F.
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