Reconstruction of summer temperatures in interior Alaska from tree-ring proxies: evidence for changing synoptic climate regimes

Abstract. Maximum latewood density and δ13C discrimination of Interior Alaska white spruce were used to reconstruct summer (May through August) temperature at Fairbanks for the period 1800– 1996, one of the first high-resolution reconstructions for this region. This combination of latewood density and δ13C discrimination explains 59.9 % of the variance in summer temperature during the period of record 1906–1996. The 200-yr. reconstruction is characterized by 7 decadal-scale regimes