Shockingly, all but one of the thirty-two glaciers in Juneau’s ice-field are currently retreating. Ancient trees have been revealed at two other nearby glaciers a several miles north: Eagle Glacier and Herbert Glacier.
Scientists, including Cathy Connor from the UAS Environmental Science Program, have been monitoring the glacier’s progress and characterizing the revealed tree stumps. The stumps she’s dated so far have ranged from around 1,200 years old to 2,350 years old.
So far, the melting ice at Mendenhall Glacier is just revealing very old trees, but scientists are hoping to find some deep pockets of sediment to study. Unfortunately, glaciers generally don’t leave much history behind. Successive freeze-thaw cycles wash away layers of earth that aren’t solid rock, leaving only the most recent chapter of history directly under the glacier. Finding a forest beneath the forest is unlikely. The effects of freezing and thawing affect scientists at all levels of research.