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Title
Supplementary data, code, validation statistics, and other information for ‘Proxy-based reconstructions of hemispheric and global surface temperature variations over the past two millennia’ (PNAS, Mann et al. 2008)
Date
2008
Abstract
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 for at least the past 1,300 years whether or not tree-ring data are used. If tree-ring data are used, the conclusion can be extended to at least the past 1,700 years, but with additional strong caveats. The reconstructed amplitude of change over past centuries is greater than hitherto reported, with somewhat greater Medieval warmth in the Northern Hemisphere, albeit still not reaching recent levels.
Metadata
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Data DOI
doi:10.26208/1893-df25
Researchers
Mann, M. E.
Penn State Department of Meteorology
Zhang, Z.
Penn State
Hughes, M. K.
University of Arizona
Bradley, R. S.
University of Massachusetts
Miller, S. K.
Penn State Department of Meteorology
Rutherford, S.
Roger Williams University
Ni, F.
University of Arizona
Data Access
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References
Mann, M.E., Zhang, Z., Hughes, M.K., Bradley, R.S., Miller, S.K., Rutherford, S., Proxy-Based Reconstructions of Hemispheric and Global Surface Temperature Variations over the Past Two Millennia, Proc. Natl. Acad. Sci., 105, 13252-13257, 2008.
