Physics
Scientific paper
Nov 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011georl..3822804b&link_type=abstract
Geophysical Research Letters, Volume 38, Issue 22, CiteID L22804
Physics
Atmospheric Composition And Structure: Evolution Of The Atmosphere (1610, 8125), Global Change: Climate Variability (1635, 3305, 3309, 4215, 4513)
Scientific paper
The Leibniz-Institute Middle Atmosphere Model LIMA is used to study mesospheric temperature trends in summer during the last 5 decades (1961-2009). In order to account for realistic atmospheric conditions LIMA adapts several observational data sets, namely a) tropospheric and stratospheric temperatures and winds from ECMWF at heights 0-35 km, b) daily Lyman-α fluxes, c) monthly carbon dioxide concentrations since 1961, and d) annual total ozone from ground-based data for 1964-1978 and monthly ozone profiles up to 0.60 hPa from satellites since 1979. This paper presents a comparison of simulated temperature trends with a) ground-based observations of lidar temperatures at 44°N, b) phase height measurements at mid-latitudes (51°N), and c) temperature trends derived from satellite data. In general there is excellent agreement between trends from LIMA and observations. Cooling in the mesosphere is on the order of 2-4 K/decade. The magnitude of the mesospheric temperature trend varies during the last five decades. In particular, the period from 1979-1997 shows large mesospheric cooling of 3-5 K/decade. This large cooling is primarily caused by long-term changes of ozone in the upper stratosphere in combination with a CO2 increase. For the first time, modeling of mesospheric temperature trends confirm the extraordinarily large trends from observations.
Berger Ulrich
Lübken Franz-Josef
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