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Regular Research Article 10 Dec 2013
Received: 07 Oct 2013 – Revised: 21 Nov 2013 – Accepted: 22 Nov 2013 – Published: 10 Dec 2013 Abstract. The best method for identification of planetary forcing of the Earth's
climate is to investigate periodic variations in climate time series. Some
natural frequencies in the Earth climate system seem to be synchronized to
planetary cycles, and amplified to a level of detection. The response by the
Earth depends on location, and in global averaged series, some planetary signals
may be below detection. Comparing sea level rise with
sunspot variations, we find phase variations, and even a phase reversal. A
periodogram of the global temperature shows that the Earth amplifies other
periods than observed in sunspots. A particular case is that the Earth
amplifies the 22 yr Hale period, and not the 11 yr Schwabe period. This may
be explained by alternating peak or plateau appearance of cosmic ray counts.
Among longer periods, the Earth amplifies the 60 yr planetary period and
keeps the phase during centennials. The recent global warming may be
interpreted as a rising branch of a millennium cycle, identified in ice
cores and sediments and also recorded in history. This cycle peaks in the
second half of this century, and then a 500 yr cooling trend will start. An
expected solar grand minimum due to a 200 yr cycle will introduce additional
cooling in the first part of this century.
Citation: Solheim, J.-E.: Signals from the planets, via the Sun to the Earth, Pattern Recogn. Phys., 1, 177-184, doi:10.5194/prp-1-177-2013, 2013.
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