CLICK ON THE GRAPH TO SEE A LARGER IMAGE
The graph above these lines is a comparison between the change of atmospheric temperature in China through the last two millennia reconstructed by Yang et al (that a kind colleague, Dr. Craig Loehle, sent to me for its analysis) and the Antarctica temperature obtained from boreholes by Bond et al.
The blue line shows the reconstruction of the atmospheric temperature from boreholes at the Antarctica. The dark blue line shows the change of temperature reconstructed by Yang et al. Both plots coincides in warm and cold periods; however, we can observe that the temperature in the Antarctica raised many years before a change of atmospheric temperature was perceptible from the proxies used by Yang et al.
The reconstruction of the Antarctic temperature shows a period from ~110 AD to ~1020 AD when the atmosphere was warmer than at present. Perhaps during this period of extreme warming during the Medieval Age the Antarctic glaciers melted at a faster and superior rate than at present.
8 December 2007
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