• Bergeron, O., H. A. Margolis, T. A. Black, C. Coursolle, A. L. Dunn, A. G. Barr, and S. C. Wofsy, Comparison of carbon dioxide fluxes over three boreal black spruce forests in Canada, Global Change Biol., 13, 89107, 2007.
  • Buermann, W., B. R. Lintner, C. D. Koven, A. Angert, J. E. Pinzon, C. J. T ucker, and I. Y. Fung, The changing carbon cycle at Mauna Loa Observatory, Proc. Natl. Acad. Sci., 704, 42494254, 2007.
  • Bunn, A. G., and S. J. Goetz, Trends in circum-polar satellite observed gross photosynthesis from 1982–2003: The role of cover type and vegetation density, Earth Interactions, 10, 119, 2006.
  • Chapin III, F. S., et al., Role of land-surface changes in Arctic summer warming, Science, 370, 657660, 2005.
  • D'Arrigo, R., Wilson, R., Liepert, B., and Cherubini, P. (2007), On the “divergence problem” in northern forests: A review of the tree-ring evidence and possible causes, Global Planet. Change, in press.
  • Goetz, S. J., A. Bunn, G. Fiske, and R. A. Houghton, Satellite observed photosynthetic trends across boreal North America associated with climate and fire disturbance, Proc. Natl. Acad. Sci., 702, 13,52113,525, 2005.
  • Hall, F. G., BOREAS experiment and science overview, J. Geophys. Res., 104, 27,62727,639, 1999.
  • Hansen, J., M. Sato, R. Ruedy, K. Lo, D. W. Lea, and M. Medina-Elizade, Global temperature change, Proc. Natl. Acad. Sci., 103, 14,28814,293, 2006.
  • Lloyd, A. H., Ecological histories, ecological futures: What recent changes at treeline reveal about the future, Ecology, 86, 16871695, 2005.
  • Peterson, B. J., J. McClelland, R. Curry, R. M. Holmes, J. E. Walsh, and K. Aagaard, Trajectory shifts in the Arctic and subarctic freshwater cycle, Science, 313, 10611066, 2006.
  • Tape, K., M. Sturm, and C. Racine, The evidence for shrub expansion in northern Alaska and the pan-Arctic, Global Change Biol., 12, 686702, 2006.
  • Tucker, C. J., et al., Extended AVHRR 8-km NDVI data set compatible with MODIS and SPOT vegetation NDVI data, Int. J. Remote Sens., 26, 44854498, 2005.
  • Walker, M. D., et al., Plant community respons-to experimental warming across the tundra biome, Proc. Natl. Acad. Sci., 103, 13421346, 2006.