Data from the paper shows Arctic sea ice concentrations were similar [or less than] the present during the Medieval & Roman Warm Periods & the late Holocene Climate Optimum, when solar activity was relatively high. The authors find Arctic sea ice was at the highest concentrations during the Little Ice Age [LIA], corresponding to a period of very low solar activity [the LIA is coincidentally when instrumental observations of global temperatures began].
Tuesday, April 15, 2014
New paper finds solar activity may influence Arctic sea ice, less ice during Medieval & Roman Warm Periods
A paper published today in Palaeogeography, Palaeoclimatology, Palaeoecology reconstructs Arctic sea ice near West Greenland over the past 5,000 years and finds that solar activity "may be an important contributor to the sea-ice changes." The paper shows Total Solar Irradiance [TSI] at the end of the 20th century was at the highest levels of the past 5,000 years, and a correspondence between solar activity and Arctic sea ice concentration.
Posted by MS at 9:42 AM