Physics
Scientific paper
May 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002jastp..64..805b&link_type=abstract
Journal of Atmospheric and Solar-Terrestrial Physics, Volume 64, Issue 7, p. 805-816.
Physics
32
Scientific paper
From indirect phase-height observations in the LF range at mid-latitudes, significant negative long-term trends of the ionospheric reflection height can be derived. The lowering of the reflection height at constant solar zenith angle can mainly be explained by a temperature decrease of the mesosphere due to increasing greenhouse gases (e.g. CO2) and a reduction of the atmospheric ozone content. Marked seasonal differences of the temperature trends could be found with a stronger cooling of the mesosphere in summer than in winter. A comparison of experimental trend results and model calculations with the three-dimensional global circulation model COMMA-IAP shows a reasonable agreement.
Berger Ulrich
Bremer Jürgen
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