This 12 day mountaineering course is having a great time!
Report from Chelsea Bomba:
"Going cragging today! Late start pancake breakfast after taking advantage of the midnight sun and traveling until 1am last night, getting very close to the Kahiltna glacier. Navigation through crevasse fields was the main lesson.
The group had a blast exploring the ablation zone (see definition below). We saw some beautiful features and spent a ton of time on crampons.
Finished the day off with lowering them into a crevasse that was wide enough for some ice climbing. 9 mile-ish day from camp round-trip. So far everyone's favorite day."
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| AMS photo by guide Allen Dahl of students traveling on the Pika Glacier |
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Ablation Zone
The loss of mass from snow or ice, mostly from melting but also including sublimation, scouring, and other processes.
Ablation is the opposite of accumulation.
While this term can be used with snow or ice the most common use is with glaciers. Glaciers gain mass over the course of a year in the accumulation zone, where the past winters snow does not all melt over the summer. Below a certain elevation, the glacier loses mass because the mass lost exceeds the amount accumulation in winter - this is called the ablation zone. Late in the summer, there is often a distinct line separating the whiter looking accumulation zone above from the darker ablation zone below - this is called the firn line