2006 Philadelphia Annual Meeting (2225 October 2006)
Paper No. 97-1
Presentation Time: 1:45 PM-2:00 PM

EXTENSION OF A MULTI-MILLENNIAL TREE RING SERIES FROM SOUTHERN COASTAL ALASKA USING SUBFOSSIL WOOD FROM GLACIER BAY NATIONAL PARK AND PRESERVE: A RECORD OF SUBARCTIC CLIMATE FORCING

WILES, Gregory C.1, LYON, Eva1, LAWSON, Daniel E.2, and FINNEGAN, David2, (1) Geology, The College of Wooster, 1189 Beall Ave, Wooster, OH 44691, gwiles@wooster.edu, (2) Cold Regions Rsch and Engineering Lab, 72 Lyme Road, Hanover, NH 03755

Few calendar-dated records of climate variability through the last 2,000 years are available for the subarctic North Pacific sector. Here we report on progress in the development of a multi-millennial tree-ring series and preliminary interpretation of its climatic significance. A remarkable set of subfossil trees radiocarbon-dated to intervals throughout the Holocene are preserved in the wake of retreating ice in Glacier Bay National Park and Preserve. Initial Glacier Bay tree-ring series are extracted from logs dating to the First Millennium AD (FMA) when they were overrun by advancing ice. The ring-width records from these trees are crossdated with a long tree-ring series from Prince William Sound, Alaska that extends into the 6th century AD. Together this exactly-dated, annual series spans almost 1800 years and provides an estimate of past temperature variability and contributes to the dating of glacier fluctuations and their response to this forcing.

The millennial to century-scale character of North Pacific climate is clear with cooling in the FMA, warming centered on AD 950, and intervals of cooling during the Little Ice Age between the 13th and 19th centuries. This ring-width record is one of inferred summer temperature and is consistent with the glacial record from land-terminating glaciers for the region, which is also considered as a proxy of summer temperature. Ongoing chronology development and dendroclimatic analysis provides a calendar-dated framework for glacier fluctuations in Glacier Bay and an independent record of temperature variability extending through the last several millennia.

2006 Philadelphia Annual Meeting (2225 October 2006)
General Information for this Meeting
Session No. 97
The Impact of Climate Change on Hydrologic and Geomorphic Processes in the Arctic and Subarctic
Pennsylvania Convention Center: 103 B
1:30 PM-5:30 PM, Monday, 23 October 2006

Geological Society of America Abstracts with Programs, Vol. 38, No. 7, p. 248

© Copyright 2006 The Geological Society of America (GSA), all rights reserved. Permission is hereby granted to the author(s) of this abstract to reproduce and distribute it freely, for noncommercial purposes. Permission is hereby granted to any individual scientist to download a single copy of this electronic file and reproduce up to 20 paper copies for noncommercial purposes advancing science and education, including classroom use, providing all reproductions include the complete content shown here, including the author information. All other forms of reproduction and/or transmittal are prohibited without written permission from GSA Copyright Permissions.