TITLE:
No Solar Signal in Temperature Proxies from Antarctica
AUTHORS:
Maxim Ogurtsov, Markus Lindholm, Risto Jalkanen, Svetlana Veretenenko
KEYWORDS:
Solar Activity, Paleoclimatiolgy
JOURNAL NAME:
Atmospheric and Climate Sciences,
Vol.5 No.4,
October
9,
2015
ABSTRACT: We analyzed
a number of Antarctic climatic proxies including: 1) an annual proxy covering the
time interval 1800-2003, 2) four low-resolution (tens to hundreds of years) ice
core records covering the last 242,000 years. The main goal of the work was to search
for traces of solar influence on Antarctic climate. Both Fourier and wavelet approaches
were used in the statistical analyses. We found no evident fingerprints of solar
cycles of Schwabe (ca 11 years), Hale (ca 22 years), Gleissberg (century-scale)
or Hallstatt (ca 2000 years). Instead a strong variation with period ca 9800 - 11,600
years is present in the long temperature proxies during the last 242,000 years.
It was shown that this variation likely was the result of varying CO2 concentration in the atmosphere, although some solar influence cannot be fully excluded.
No features of a quasi 10,000 year variation were found in the Greenland δ18O record. The results show
that solar-climatic relationship in Antarctica is weaker than in the high-latitude
areas of the Northern Hemisphere.