Jan FEB Mar 13 2009 2010 2011 2 captures 13 Feb 10 - 20 Feb 10

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North Hemisphere patterns of phase coherence between solar/geomagmetic activity and NCEP/NCAR and ERA40 near-surface air temperature in period 7-8y oscillatory modes

Milan Palus
Institute of Computer Science, Academy of Sciences of the Czech Republic
Pod vodárenskou vezí 2, 182 07 Prague 8, Czech Republic
E-mail: mp@cs.cas.cz

Dagmar Novotna
Institute of Atmospheric Physics, Academy of Sciences of the Czech Republic
Bocni II/1401, 141 31 Prague 4, Czech Republic
E-mail: nov@ufa.cas.cz

Abstract:

Beginning from 1950's, Palus and Novotna (J. Atmos. Sol.-Terr. Phys. 71, 923--930, 2009) observed statistically significant phase coherence among oscillatory modes with the period of approximately 7--8 years detected in monthly time series of sunspot numbers, geomagnetic activity aa index, NAO index and near-surface air temperature from several mid-latitude European stations. Using again the oscillatory modes with the period 7-8y, here we study North Hemisphere patterns of phase coherence between solar/geomagnetic activity and NCEP/NCAR and ERA40 near-surface air temperature. Both the reanalysis datasets provide consistent patterns of areas with marked, statistically significant coupling between solar/geomagnetic activity and climate variability observed in continuous monthly data, independent of the season, however, confined to the temporal scale related to oscillatory periods about 7--8 years.