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Continental-scale temperature variability during the past two millennia

Ahmed, M and Anchukaitis, KJ and Asrat, A and Borgaonkar, HP and Braida, M and Buckley, BM and Bntgen, U and Chase, BM and Christie, DA and Cook, ER and Curran, MAJ and Diaz, HF and Esper, J and Fan, ZX and Gaire, NP and Ge, Q and Gergis, J and González-Rouco, JF and Goosse, H and Grab, SW and Graham, N and Graham, R and Grosjean, M and Hanhijärvi, ST and Kaufman, DS and Kiefer, T and Kimura, K. and Korhola, AA and Krusic, PJ and Lara, A and Lézine, AM and Ljungqvist, FC and Lorrey, AM and Luterbacher, J and Masson-Delmotte, V and McCarroll, D and McConnell, JR and McKay, NP and Morales, MS and Moy, AD and Mulvaney, R and Mundo, IA and Nakatsuka, T and Nash, DJ and Neukom, R and Nicholson, SE and Oerter, H. and Palmer, J.G. and Phipps, S.J. and Prieto, M.R. and Rivera, A. and Sano, M. and Severi, M. and Shanahan, T.M. and Shao, X. and Shi, F. and Sigl, M. and Smerdon, J.E. and Solomina, O.N. and Steig, E.J. and Stenni, B. and Thamban, M. and Trouet, V. and Turney, C.S.M. and Umer, M. and Cvan Ommen, T. and Verschuren, D. and Viau, A.E. and Villalba, R. and Vinther, B.M. and Von Gunten, L. and Wagner, S. and Wahl, E.R. and Wanner, H. and Werner, J.P. and White, J.W.C. and Yasue, K. and Zorita, E. (2013) Continental-scale temperature variability during the past two millennia. Nature Geoscience, 6 (5). pp. 339-346.

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Past global climate changes had strong regional expression. To elucidate their spatio-temporal pattern, we reconstructed past temperatures for seven continental-scale regions during the past one to two millennia. The most coherent feature in nearly all of the regional temperature reconstructions is a long-term cooling trend, which ended late in the nineteenth century. At multi-decadal to centennial scales, temperature variability shows distinctly different regional patterns, with more similarity within each hemisphere than between them. There were no globally synchronous multi-decadal warm or cold intervals that define a worldwide Medieval Warm Period or Little Ice Age, but all reconstructions show generally cold conditions between ad 1580 and 1880, punctuated in some regions by warm decades during the eighteenth century. The transition to these colder conditions occurred earlier in the Arctic, Europe and Asia than in North America or the Southern Hemisphere regions. Recent warming reversed the long-term cooling; during the period ad 1971-2000, the area-weighted average reconstructed temperature was higher than any other time in nearly 1,400 years.

Item Type: Article
Additional Information: Copyright of this article belongs to Nature publishing.
Uncontrolled Keywords: climate change; cooling; decadal variation; eighteenth century; global change; Little Ice Age; Medieval Warm Period; nineteenth century; reconstruction; regional climate; Southern Hemisphere; spatiotemporal analysis, Arctic; Asia; Europe; North America
Subjects: Meteorology and Climatology
Depositing User: IITM Library
Date Deposited: 12 Jun 2014 10:37
Last Modified: 12 Jun 2014 10:37

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