0Climate Change in the Koyukuk and Yukon River Valleys of Alaska
Climatological data from first-order observing stations in Alaska all show a trend toward increasing mean annual temperatures. This trend also shows seasonal variability with the largest changes occurring in winter and spring seasons. Data from cooperative observing stations in the Koyukuk and Yukon River valleys of Alaska will be studied to examine the overall temperature and precipitation change over the available period of record. Linear trend analyses, tests for significance, and total change calculations will be performed on the mean annual, seasonal, and monthly time series data of temperature and precipitation. Not only changes in means, but changes in extreme temperature events will also be studied by investigating the change in frequency of days below particular thresholds and changes in the temperature frequency distribution.
Photo by Todd Paris (UAF), copyright.
Also of interest to this study are the changes taking place during the transitional seasons of spring and autumn. Thawing and freezing degree day totals in spring and autumn, respectively, will be studied for the time series. Changes in the precipitation regime will be analyzed by investigating the amount and timing of precipitation and snowfall events as it relates to ecological / biological processes of importance to the communities, such as moose behavior in autumn.
Project Participant Affiliation
Shannon McNeeley UAF-Anthropology
Karin Lehmkuhl US Fish and Wildlife
Martha Shulski UAF-GI Alaska Climate Research Center
John Walsh UAF-International Arctic Research Center
Swedish Translation
Page for Participants
This project is funded by the Cooperative Institute for Arctic Research, Center for Global Change, Fish and Wildlife Service (Alaska), and Geophysical Institute, University of Alaska Fairbanks.

Last Update: April 4, 2007
email webmaster