Other
Scientific paper
Dec 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsa33b..04f&link_type=abstract
American Geophysical Union, Fall Meeting 2009, abstract #SA33B-04
Other
[3311] Atmospheric Processes / Clouds And Aerosols, [3332] Atmospheric Processes / Mesospheric Dynamics, [3360] Atmospheric Processes / Remote Sensing
Scientific paper
Noctilucent clouds (NLC) are the visible manifestation of ice particles in the polar summer mesopause region and can be observed by active laser remote sensing precisely. Cloud parameters show variabilities ranging from minutes to decades, including tidal and solar cycle variations. Between 1997 and 2009 NLC have been observed by the ALOMAR Rayleigh/Mie/Raman (RMR) lidar in Northern Norway at 69°N, 16°E. During a total of 4105 measurement hours, being well distributed over the 13 years, season and local time, NLC were detected for 1735 hours, which is the largest NLC data base acquired by lidar. We will report on the variability of NLC parameters, like occurrence, altitude, brightness and particle properties, on different time scales. During the extended approach to the last solar minimum the occurrence rate of bright clouds did not follow the expected anti-correlation to solar radiation. Only since 2008, where the minimum was reached, this cloud class occurred more frequent again, which indicates that other processes than the widely assumed direct Lyman-alpha influence on water vapor have major impact on the NLC formation. For interpretation of our lidar NLC data we use multi-year data sets obtained by colocated radars and LIMA (Leibniz Institute Middle Atmosphere Model). The altitude profile of the cloud brightness can exhibit multiple distinct maxima, indicating the influence of tides and gravity waves on layering processes in the summer mesopause region. We will investigate the properties of double layers which occur during about 10% of our NLC observations.
Baumgarten Gerd
Berger Ulrich
Fiedler Jens
Hoffmann Peter
Luebken F.
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