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Data from northen treeline forests sites (Alaska; the Canadian Interior; Labrador, Canada; Taymir peninsula, Russia and an elevational treeline site in Mongolia) sampled by the TRL over the past two decades have and are being used in modelling and reconstruction of large scale temperature variability over the past several centuries. Initial reconstruction of annual Arctic and northern hemisphere temperatures were published by Jacoby & D'Arrigo (1989) and D'Arrigo & Jacoby (1993). Since then new sites have been sampled and some existing sites have been updated.

The map above shows 20 forest sites utilized in recent model reconstructing Northern Hemisphere temperature (D'Arrigo et al., in press). The two white dots represent new sites: one in Mongolia and a second on the Taymir Peninsula, Russia. The sites in Scandinavia and northwestern Russia are data from other researchers.

Related Publications:

D'Arrigo, R.D., G.C. Jacoby, M. Free, and A. Robock, 1999. Northern hemisphere temperature variability for the past three centuries: tree-ring and model estimates, Climatic Change (in press).

Jacoby, G.C., R.D. D'Arrigo, and G.P. Juday. 1999. Tree-ring indicators of climatic change at northern latitudes, World Resources Review (11) 1, 21-29.

Jacoby, G., D'Arrigo, R., Luckman, B. 1996. Millennial and near-millennial scale dendroclimatic studies in northern North America. In Jones, P.D., Bradley, R.S., and Jouzel, J., eds., Climatic Variations and Forcing Mechanisms of the Last 2000 Years. NATO ASI Series I41: 67-84.

D'Arrigo, R.D., Jacoby, G.C. 1993. Secular trends in high northern latitude temperature reconstructions based on tree rings. Climatic Change 25: 163-177.

Overpeck, J., K. Hughen, D. Hardy, R. Bradley, R. Case, M. Douglas, B. Finney, K. Gajewski, G. Jacoby, A. Jennings, S. Lamoureux, A. Lasca, G. MacDonald, J. Moore, M. Retelle, S. Smith, A. Wolfe, G.Zielinski. 1997. Arctic environmental change of the last four centuries. Science 278: 1251-1256.

D'Arrigo, R.D., Jacoby, G.C., Free, R.M. 1992. Tree-ring width and maximum latewood density at the North American tree line: parameters of climatic change. Canadian Journal of Forest Research 22:1290-1296.

Jacoby, Jr., G.C., D'Arrigo, R.D. 1992. Spatial patterns of tree-growth anomalies from the North American boreal treeline in the early 1800's, including the year 1816. In The Year Without a Summer? World Climate in 1816 (ed. C.R. Harrington). Canadian Museum of Nature, Ottawa, Ontario: 255-265.

Jacoby, G.C. and D'Arrigo, R.D. 1989. Reconstructed northern hemisphere annual temperature since 1671 based on high-latitude tree-ring data from North America. Climatic Change 14:39-59.

Jacoby, G.C., E.R. Cook and L.D. Ulan. 1985. Reconstructed summer degree days in central Alaska and northwestern Canada since 1524. Quaternary Research 23:18-26.