Tham khảo tài liệu 'global warming part 3', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Global Warming CO2 vs Sun 27 reconstruction occur in a 200-year period centered on AD 1000. A Medieval Warm Period is supported by other paleoclimate evidence from northern Fennoscandia although the new tree-ring evidence from Tornetrask suggests that this period was much warmer than previously recognized. b - Loehle McCulloch 2008 presented a reconstruction using data that largely excluded tree-ring records to investigate the possible effect of proxy type on reconstruction outcome Fig. 6 . Again confidence intervals were computed for more robust evaluation of the results. Fig. 5. Reconstructions by Grudd 2008 blue curve with a 95 confidence interval grey shading compared to Briffa et al. 1992 red curve and Grudd et al. 2002 hatched curve . Fig. 6. Loehle McCulloch 2008 temperature reconstruction. The obtained data are for long series that had been previously calibrated and converted to temperature by their respective authors. All data that were used had at least 20 dates over 28 Global Warming the 2000-year period. The final results were smoothed 29-year running mean therefore peaks and troughs are damped compared to annual data. Thus it is not possible to compare recent annual data to this figure and ask about anomalous years or decades. The results continue to show the Medieval Warm Period MWP and the Little Ice Age LIA quite clearly. The 95 confidence intervals indicate that the MWP was significantly warmer than the bimillennial average during most of approximately 820-1040 AD. Likewise the LIA was significantly cooler than the bimillennial average during most of approximately 1440-1740 AD. The peak value of the MWP is C above the mean over the period again as a 29year mean not annual value . This is C above the last reported value in 1935 which includes data through 1949 of C. The main significance of these results is the overall picture of the 2000 year pattern showing the MWP and LIA timing and curve shapes. Finally observing the .
