Hostname: page-component-7b7567c8c-wxvwp Total loading time: 0 Render date: 2026-11-15T10:22:49.381Z Has data issue: false hasContentIssue false

Boreal temperature variability inferred from maximum latewood density and tree-ring width data, Wrangell Mountain region, Alaska

Published online by Cambridge University Press:  20 January 2017

Nicole K. Davi*
Affiliation:
Lamont-Doherty Earth Observatory, Columbia University, Palisades, NY 10964, USA
Gordon C. Jacoby
Affiliation:
Lamont-Doherty Earth Observatory, Columbia University, Palisades, NY 10964, USA
Gregory C. Wiles
Affiliation:
Department of Geology, The College of Wooster, Wooster, OH 44691, USA
*
*Corresponding author. Fax: +1-845-365-8152.E-mail address:ndavi@Ldeo.columbia.edu (N. K. Davi).

Abstract

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 51% of 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.

Information

Type
Research Article
Copyright
University of Washington

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

Article purchase

Temporarily unavailable