IAI-ScientificArticles-CRN_003_Wrangell: Boreal temperature variability inferred from maximum latewood density and tree-ring width data, Alaska

This metadata references the scientific article: "Boreal temperature
variability inferred from maximum latewood density and tree-ring width data,
Wrangell Mountain region, Alaska", which can be download from here. Authors:
Nicole K. Davi,(a,)* Gordon C. Jacoby,(a) and Gregory C. Wiles(b)
(a)Lamont-Doherty Earth Observatory, Columbia University, Palisades, NY 10964,
USA (b)Department of Geology, The College of Wooster, Wooster, OH 44691, USA
Variations in both width and density of annual rings from a network of tree
chronologies were used to develop high-resolution proxies to extend the climate
record in the Wrangell Mountain region of Alaska. We developed a warm-season
(July-September) temperature reconstruction that spans A.D. 1593-1992 based on
the first eigenvector from principal component analysis of six maximum latewood
density (MXD) chronologies. The climate/tree-growth model accounts for 510f the
temperature variance from 1958 to 1992 and shows cold in the late 1600s early
1700s followed by a warmer period, cooling in the late 1700s early 1800s, and
warming in the 20th century. The 20th century is the warmest of the past four
centuries. Several severely cold warm-seasons coincide with major volcanic
eruptions. The first eigenvector from a ring-width (RW) network, based on nine
chronologies from the Wrangell Mountain region (A.D. 1550-1970), is correlated
positively with both reconstructed and recorded Northern Hemisphere
temperatures. RW shows a temporal history similar to that of MXD by increased
growth (warmer) and decreased growth (cooler) intervals and trends. After
around 1970 the RW series show a decrease in growth, while station data show
continued warming, which may be related to increasing moisture stress or other
factors. Both the temperature history based on MXD and the growth trends from
the RW series are consistent with well-dated glacier fluctuations in the
Wrangell Mountains and some of the temperature variations also correspond to
variations in solar activity. 2003 University of Washington. Published by
Elsevier Inc. All rights reserved. Keywords: Paleoclimate; Tree rings; Maximum
latewood density; Ring width; Temperature; Boreal; Alaska CRN003, PI Dr. Brian
Luckman.