Spatial and temporal characteristics of climate in medieval times revisited
H. F. Diaz, R. Trigo, M. K. Hughes, M. E. Mann, E. Xoplaki, and D. Barriopedro
Bulletin of the American Meteorological Society (November 2011)
Abstract [...] high-resolution paleorecords prior to approximately the fifteenth century were (and are still) relatively sparse (compared to modern instrumental records). Since the mid- 1990s there has been a considerable growth in the availability of high-quality proxy ...