Luni-solar 18.6- and solar cycle 10 - 11-year signals in USA air temperature records.

Details Luni-solar 18.6- and solar cycle 10 - 11-year signals in USA air temperature records. Luni-solar 18.6- and solar cycle 10 - 11-year signals in USA air temperature records.

Feb 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993ijcli..13...31c&link_type=abstract

International Journa l of Climatol., Vol. 13, No. 1, p. 31 - 50

Physics

14

Scientific paper

Spectrum analysis of 1197 USA air temperature records yields evidence for two peaks with periods 18.8±1.7 and 10.4±0.5 years. Tests by the t-statistic show that both are significant at confidence levels of 99.9 per cent, and both account for 23 per cent of total variance in the raw data. They are identified as the luni-solar 18.6 year Mn and solar cycle Sc 10 - 11 year signals in climate, induced by the twelfth largest constituent tide acting on the Earth and a variation of 10 to 11 years in the Sun's luminosity of the order of 0.1 per cent. Amplitude and phase of Mn wavetrains are highly non-stationary with respect to both time and geography; in particular, abrupt 180° phase changes in wave polarity are often observed. Amplitude and phase of the Sc waves are also highly non-stationary.

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