BLM REA CYR 2013 Long-Term Future (2060s) Percent Permafrost Cover within the Stream Network

Metadata Updated: November 12, 2020

Thawing permafrost in interior Alaska will lead to dramatic changes in stream discharge, bank stability, and water chemistry. Stream discharge will change from surface- to groundwater-dominated flow, resulting in increased baseflows (including winter flows) and declining annual flows. Thawing permafrost along streams and rivers will decrease bank stability, which could lead to erosion and alteration of the stream channel. Shifts to deeper flow paths will result in altered stream chemistry, depending upon the soil types intersected and residence times. Observations in Alaska show that flow paths will interact with organic-rich soils and result in increased concentrations of dissolved organic carbon and nitrogen, although over longer time periods deeper flow paths through mineral soils may result in adsorption and mineralization of organic matter and decreased export to streams. Increased mineralization and weathering after permafrost thaw will lead to higher export of inorganic nutrients and major ions to streams. Increases in nutrient export and groundwater flow will likely have positive effects on aquatic habitats, such as increased productivity and increased overwintering habitats, respectively. Currently, permafrost covers most of the study area, resulting in high watershed cover for both small and large streams. By the 2060s, almost a quarter of small streams and over 10% of large streams will no longer have permafrost in their watersheds. The watersheds most affected by permafrost thaw include tributaries of the Tanana River, such as the Tolovana, Chena, and Salcha rivers in addition to upper Yukon tributaries, such as Beaver and Birch creeks.

Access & Use Information

License: No license information was provided. If this work was prepared by an officer or employee of the United States government as part of that person's official duties it is considered a U.S. Government Work.

Downloads & Resources


Metadata Date October 13, 2017
Metadata Created Date November 12, 2020
Metadata Updated Date November 12, 2020
Reference Date(s) August 10, 2016 (publication)
Frequency Of Update notPlanned

Metadata Source

Harvested from DOI Open Data

Additional Metadata

Resource Type Dataset
Metadata Date October 13, 2017
Metadata Created Date November 12, 2020
Metadata Updated Date November 12, 2020
Reference Date(s) August 10, 2016 (publication)
Responsible Party Alaska Center for Conservation Science, University of Alaska Anchorage (Point of Contact)
Contact Email
Access Constraints Use Constraints: These data are provided by Bureau of Land Management (BLM) "as is" and may contain errors or omissions. The User assumes the entire risk associated with its use of these data and bears all responsibility in determining whether these data are fit for the User's intended use. The information contained in these data is dynamic and may change over time. The data are not better than the original sources from which they were derived, and both scale and accuracy may vary across the data set. These data may not have the accuracy, resolution, completeness, timeliness, or other characteristics appropriate for applications that potential users of the data may contemplate. The User is encouraged to carefully consider the content of the metadata file associated with these data. These data are neither legal documents nor land surveys, and must not be used as such. Official records may be referenced at most BLM offices. Please report any errors in the data to the BLM office for which it was obtained. The BLM should be cited as the data source in any products derived from these data. Any Users wishing to modify the data should describe the types of modifications they have performed. The User should not misrepresent the data, nor imply that changes made were approved or endorsed by BLM. This information may be updated without notification., Access Constraints: None, these data are considered public domain
Bbox East Long -141.001857465
Bbox North Lat 69.034456883
Bbox South Lat 62.0292445479
Bbox West Long -163.832876574
Coupled Resource
Frequency Of Update notPlanned
Licence The BLM assumes no responsibility for errors or omissions. No warranty is made by the BLM as to the accuracy, reliability, or completeness of these data for individual use or aggregate use with other data; nor shall the act of distribution to contractors, partners, or beyond, constitute any such warranty for individual or aggregate data use with other data. Although these data have been processed successfully on computers of BLM, no warranty, expressed or implied, is made by BLM regarding the use of these data on any other system, or for general or scientific purposes, nor does the fact of distribution constitute or imply any such warranty. In no event shall the BLM have any liability whatsoever for payment of any consequential, incidental, indirect, special, or tort damages of any kind, including, but not limited to, any loss of profits arising out of the use or reliance on the geographic data or arising out of the delivery, installation, operation, or support by BLM.
Metadata Language
Metadata Type geospatial
Progress completed
Spatial Data Service Type
Spatial Reference System
Spatial Harvester True

Didn't find what you're looking for? Suggest a dataset here.