An impressive glacier formed from firn (FIRN), a Swiss-German word meaning “last year’s snow”. Note the clearly evident layers and, for a sense of scale, the people walking on the glacier, which is formed simply from fallen snow. Each distinct layer of firn contains a slightly different contribution from the atmosphere.
Here’s a thread to discuss the migration of gases (or not!) through firn, or old snow, and the ramifications for past levels of atmospheric gases. When I discover how to move comments between threads, I’ll add the relevant comments from other threads.
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