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| Titel |
Phase coherence between solar/geomagnetic activity and climate variability from the stratosphere to the troposphere and the North Atlantic Oscillation |
| VerfasserIn |
M. Paluš, D. Novotná |
| Konferenz |
EGU General Assembly 2012
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 14 (2012) |
| Datensatznummer |
250066110
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| Zusammenfassung |
| Using the enhanced Monte Carlo Singular System Analysis (MC SSA) [1], Palus & Novotna detected a number of oscillatory modes in monthly time series of sunspot numbers, geomagnetic activity aa index, North Atlantic Oscillation (NAO) index and near-surface air temperature from several mid-latitude European stations, some of them with common periods [2]. Instantaneous phases of the detected modes underwent synchronization analysis. In the case of the modes with the period 7-8y statistically significant phase coherence, beginning from 1950's, has been observed [3]. Study of phase coherence between solar/geomagnetic activity and NCEP/NCAR and ERA40 air temperature confirms that the response to solar signal is not homogenously distributed over the atmosphere, but it shows latitudinal, longitudinal and altitudinal dependence. The areas of marked, statistically significant coupling between solar/geomagnetic activity and climate variability observed in continuous monthly data, independently of the season or the QBO phase are extended over large areas of the stratosphere, however, confined within the area of the NAO influence near the Earth surface [4]. Using the concept of partial phase synchronization [5] we investigate the role of the NAO in transferring solar/geomagnetic signatures from the stratosphere to the troposphere.
This study is supported by the Czech Science Foundation, Project No. P103/11/J068.
References
[1] M. Palus and D. Novotna, „Enhanced Monte Carlo Singular System Analysis and Detection of
Period 7.8 Years Oscillatory Modes in the Monthly NAO Index and Temperature Records", Nonlin.
Proc. Geophys., 11, 721-729 (2004)
[2] M. Palus and D. Novotna, “Common Oscillatory Modes in Geomagnetic Activity, NAO Index and
Surface Air Temperature Records", J. Atmos. Sol.-Terr. Phys., 69, 2405-2415 (2007)
[3] M. Palus and D. Novotna, “Phase-coherent Oscillatory Modes in Solar and Geomagnetic Activity
and Climate Variability", J. Atmos. Sol.-Terr. Phys., 71, 923-930 (2009)
[4] M. Palus and D. Novotna, “Northern Hemisphere Patterns of Phase Coherence between Solar/Geomagnetic Activity and NCEP/NCAR and ERA40 Near-surface Air Temperature in Period 7-8 Years Oscillatory Modes", Nonlin. Proc. Geophys., 18, 251-260 (2011)
[5] B. Schelter et al., “Partial Phase Synchronization for Multivariate Synchronizing Systems", Phys.
Rev. Lett., 96, 208103 (2006) |
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