Physics
Scientific paper
Dec 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsa53d..05b&link_type=abstract
American Geophysical Union, Fall Meeting 2008, abstract #SA53D-05
Physics
0320 Cloud Physics And Chemistry, 0340 Middle Atmosphere: Composition And Chemistry, 0545 Modeling (4255), 0550 Model Verification And Validation, 3311 Clouds And Aerosols
Scientific paper
In this paper we investigate the long term trend of mesospheric ice layers (NLC/PMC) by means of a model study with LIMA-ICE (Leibniz Middle Atmosphere Model and ICE Model). We take into account 3 decades of northern and southern mesospheric summers from 1979 up to 2008, a total of more than 60 PMC seasons, and compute the mean occurrence, altitude, and brightness of each PMC season. Each summer season has individual mesospheric temperatures, dynamics, water vapor concentrations, and Lyman-alpha conditions computed by the LIMA-GCM. As as result, the analysis of PMC trend behaviour show that the parameters occurrence, brightness, and altitudes can be used to detect a trend signal in PMC/NLC formation. In our paper we will present comparisons of our model results to satellite time series (SBUV) and lidar measurements over ALOMAR. Especially, we will investigate the different roles of possible trends of background mesopause temperatures and water vapor combined with solar cycle conditions, and their effect on NLC/PMC trends.
Baumgarten Gerd
Berger Ulrich
Fiedler Jens
Luebken F.
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