scostep 2010 (stp12) - Leibniz-Institut für Atmosphärenphysik an der ...

STP12 Abstracts
Berlin, 12 - 16 July 2010
SCOSTEP Symposium 2010
Long-term trends and their changes in midlatitude MLT winds
Jacobi Christoph 1 , Liu Renqiang 1 , Merzlyakov Eugeny 2 , Portnyagin Yuri 2 , Manson Alan 3 , Meek
Chris 3 , Solovyova Tatjana 2
1 University of Leipzig, Institute for Meteorology, 2 Institute for Experimental Meteorology, Obninsk,
3 Institute of Space and Atmospheric Studies, University of Saskatchewan, Saskatoon
Long-term variability of mesosphere/lower thermosphere (MLT) winds, tidal amplitudes and
phases, and long-period oscillations has been analyzed using three ground-based wind data
series obtained at Collm (52°N, 15°E), Obninsk (55°N, 37°E) and Saskatoon (52°N, 107°E).
Applying piecewise linear trend analysis with a priori unknown number and positions of
breakpoints shows that trend models with breakpoints are partly preferred against straight
lines. Differences between the three wind time series and their trends are found, which are
partly connected with stratospheric stationary planetary waves, indicating an influence of
stratospheric circulation on MLT trends.