Physics
Scientific paper
Dec 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsa33a..02b&link_type=abstract
American Geophysical Union, Fall Meeting 2011, abstract #SA33A-02
Physics
[0300] Atmospheric Composition And Structure, [3300] Atmospheric Processes
Scientific paper
The LIMA Leibniz-Institute Middle Atmosphere Model is used to study mesospheric temperature trends during the last 5 decades from 1961 until 2010. In order to account for realistic atmospheric conditions LIMA adapts several observational data sets, such as tropospheric and stratospheric temperatures and winds from ECMWF at heights 0-35 km, daily Lyman-alpha fluxes, and monthly carbon dioxide concentrations since 1961, and the monthly ozone profiles up to 0.6 hPa provided from SBUV/TOMS satellite instruments since 1979. This paper presents a comparison of simulated temperature trends with groundbased observations of temperature (lidar) and phase height trends (radiowave technique) at mid-latitudes (45-50N) and temperature trends derived from satellite data (SSU). Generally good agreement is found between model trends and trends derived from observations without any significant differences. As a major result the greenhouse warming in the lower troposphere reverses to a cooling trend in the mesosphere where the magnitude of the trend of 2-4 K/decade is about a factor of 10 larger than compared to trends in global mean surface temperature which are about 0.2 K/decade. The size of mesospheric temperature trend is not constant during the last 5 decades. Especially, the period from 1979 - 1997 shows a large mesospheric cooling trend of 4-5 K/decade which is mainly affected by an upper stratospheric ozone decrease over the same period.
Berger Ulrich
Luebken F.
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