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The Yukon River Basin, which encompasses 330,000 square miles in northwestern Canada and central Alaska (Fig. 1), is one of the largest and most diverse ecosystems in North America. The Yukon River is also fundamental to the ecosystems of the eastern Bering Sea and Chukchi Sea, providing most of the freshwater runoff, sediments, and dissolved solutes. Despite its remoteness and perceived invulnerability, the Yukon River Basin is changing. For example, records of air temperature during 1961- 1990 indicate a warming trend of about 0.75 °C per decade at latitudes where the Yukon River is located. Increases in temperature will have wide-ranging effects on permafrost distribution, glacial runoff and the movement of carbon...
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Where the USGS works to understand the Alaskan environment through biology, geology, geography, and water resources. [This home page for the Alaska Division of the USGS provides links to numerous programs, projects, and findings in the following research areas:] USGS and Water in Alaska The Water Resources Office works on a variety of programs including: glacier monitoring, hydrologic data collection, the National Water-Quality Assessment (NAWQA), and volcano hazards. USGS and Geography/Mapping in Alaska The Geographic Sciences Office has three programmatic Components in Alaska including: Geographic Analysis and Monitoring (GAM), Land Remote Sensing (LRS), and Cooperative Topographic Mapping (CTM). USGS and Geology...
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