Proxy-based reconstructions of hemispheric and global surface temperature variations over the past two millennia

Following the suggestions of a recent National Research Council report [NRC (National Research Council) (2006) Surface Temperature Reconstructions for the Last 2,000 Years (Natl Acad Press, Washington, DC).], we reconstruct surface temperature at hemispheric and global scale for much of the last 2,000 years using a greatly expanded set of proxy data for decadal-to-centennial climate changes, recently updated instrumental data, and complementary methods that have been thoroughly tested and validated with model simulation experiments. Our results extend previous conclusions that recent Northern Hemisphere surface temperature increases are likely anomalous in a long-term context. Recent warmth appears anomalous…

• NS
  National Science Foundation

  Award: 0542356
• UD
  U.S. Department of Energy

  Awards: FG02-98ER62604, DE-FG02-, DE-FG02
• NO
  National Oceanic and Atmospheric Administration
• OO
  Office of Science
• BA
  Biological and Environmental Research