Physics
Scientific paper
May 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agusmsa51a..02b&link_type=abstract
American Geophysical Union, Fall Meeting 2007, abstract #SA51A-02
Physics
0340 Middle Atmosphere: Composition And Chemistry, 0341 Middle Atmosphere: Constituent Transport And Chemistry (3334)
Scientific paper
Layers in the summer mesosphere are studied using an ice model which applies background conditions from a new model called LIMA (Leibniz Institute Middle Atmosphere Model). At low altitudes LIMA assimilates ECMWF ERA40 data which introduce variability in the upper atmosphere. LIMA adequately presents the conditions in the mesosphere/lower thermosphere. Ice formation is interactively coupled to LIMA background water vapor which leads to 'freeze drying'. Model ice layers vary in time and space and occasionally appear at mid latitudes. These variations of ice properties led us to introduce the term 'weather' for this phenomena. The geographical distribution of ice clouds generally agrees with observations. For example, the mean occurrence rate of PMCs as a function of season and latitude is 30 percent at ALOMAR (69N), the mean height is 83.6 km, and the mean width of the PMC is 800 m. At high latitudes ice layers sometimes disappears ('ice holes'), a feature which is also evident in satellite data.
Berger Ulrich
Luebken F. J.
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