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| Titel |
Long-term dynamics of OH∗ temperatures over central Europe: trends and solar correlations |
| VerfasserIn |
Christoph Kalicinsky, Peter Knieling, Ralf Koppmann, Dirk Offermann, Wolfgang Steinbrecht, Johannes Wintel |
| Konferenz |
EGU General Assembly 2017
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 19 (2017) |
| Datensatznummer |
250141309
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| Publikation (Nr.) |
 EGU/EGU2017-4807.pdf |
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| Zusammenfassung |
| We present the analysis of annual average OH* temperatures in the mesopause region derived
from measurements of the GRound based Infrared P-branch Spectrometer (GRIPS) at
Wuppertal (51∘ N, 7∘ E) in the time interval 1988 to 2015. The temperature time series shows
a clear correlation with the solar radio flux F10.7cm (11-year cycle of solar activity) with a
sensitivity of about 3 - 5 K/(100 SFU) . Beside this correlation we find a trend break in the
temperature time series in 2008.
This apparent trend break can be caused by a long periodic oscillation. Thus, we describe the
OH∗ temperature time series by using the solar radio flux and an oscillation. A least square fit
leads to a sensitivity to the solar activity of (4.1 ± 0.8) K/(100 SFU), a period
P = (24.8 ± 3.3) years, and an amplitude Csin = (1.95 ± 0.44) K of the oscillation.
The most important finding here is that using this description an additional linear trend is no
longer needed.
It furthermore turns out that a trend derivation is principally difficult if a long period
oscillation exists in the atmosphere and the sampling interval is shorter than the period. As a
consequence, completely different linear trends with respect to magnitude and sign can be
observed depending on the analysed time interval. |
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