Syun-Ichi Akasofu
International Arctic Research Center, University of Alaska Fairbanks, USA;
E-Mail: sakasofu@iarc.uaf.edu; Tel.: 1-907-474-6012; Fax: 1-907-474-5662
Received: 28 January 2012; in revised form: 15 April 2013/ Accepted: 15 April 2013/
Published: 3 May 2013
Abstract: The rise in global average temperature over the last century has halted since roughly the year 2000, despite the fact that the release of CO2 into the atmosphere is still increasing. It is suggested here that this interruption has been caused by the suspension of the near linear (+ 0.5° C/100 years or 0.05° C/10 years) temperature increase over the last two centuries, due to recovery from the Little Ice Age, by a superposed multi-decadal oscillation of a 0.2° C amplitude and a 50~60 year period, which reached its positive peak in about the year 2000—a halting similar to those that occurred around 1880 and 1940. Because both the near linear change and the multi-decadal oscillation are likely to be natural changes (the recovery from the Little Ice Age (LIA) and an oscillation related to the Pacific Decadal Oscillation (PDO), respectively), they must be carefully subtracted from temperature data before estimating the effects of CO2.
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