Gulkana Glacier
Geology
Gulkana Glacier is one of three detailed long-term glacier monitoring sites run by the USGS in a study on climate change and glacier-related hydrologic processes. Wolverine Glacier and South Cascade Glacier are the other two monitoring sites. The study monitors climate, glacial movement, glacial runoff, glacier mass-balance, and stream runoff.
Since 1966 when the USGS began collecting annual mass balance data, the mass of Gulkana Glacier has been decreasing by 0.4 meters per year on average. In addition, the motion of the ice has slowed, which has resulted in glacier retreat. The glacier enjoys a peak thickness in May or June which is 2 to 5 meters thicker than its minimum in August or September.
The USGS Phelan Creek near Paxson stream-gaging station is located at an altitude of 1,125 meters above sea level and one kilometer downstream from the glacier's 1996 terminus. The creek bed contains gravel and boulders of various sizes, typical of a glacial moraine.
![Suspension bridge over College Creek.](http://upload.wikimedia.org/wikipedia/commons/thumb/3/31/Suspension_bridge_over_College_Creek%2C_west_of_Gulkana_Glacier%2C_near_Richardson_Highway%2C_August_11%2C_2013.jpg/220px-Suspension_bridge_over_College_Creek%2C_west_of_Gulkana_Glacier%2C_near_Richardson_Highway%2C_August_11%2C_2013.jpg)
References
- ^ http://ak.water.usgs.gov/glaciology/gulkana/ Archived 2014-05-17 at the Wayback Machine U.S. Geological Survey Program Overview on Gulkana Glacier
- ^ https://ssl.panoramio.com/photo/45059844 Coordinates of Richardson Monument at 63° 11' 8.36" N 145° 32' 33.61" W near Gulkana Glacier
- ^ http://www.tripadvisor.com/Travel-g28923-c119230/Alaska:United-States:Richardson.Highway.Sights.html Richardson Highway on TripAdvisor
- ^ Alaska Atlas and Gazetteer (Map). DeLorme Mapping Company. 2007.
- ^ http://www.arcticman.com/directions-to-arctic-man Directions to Arctic Man 2014
- ^ http://pubs.usgs.gov/sir/2011/5046/ March, R.S., and O’Neel, Shad, 2011, Gulkana Glacier, Alaska—Mass balance, meteorology, and water measurements, 1997–2001: U.S. Geological Survey Scientific Investigations Report 2011-5046, 72 p.