Glacial Melt Is Exposing Land That's Been Hidden For More Than 40000 Years - IFLScience

Melting ice is exposing hidden landscapes in the Canadian Arctic that haven't been seen in more than 40,000 years, new research published in Nature Communications reveals.

Unsurprisingly, the study suggests climate change is the driving force behind this record-breaking glacial retreat and with Arctic temps rising at increasing speed thanks to strong positive feedback loops in the polar regions, we can expect things to heat up even quicker in the near future. According to researchers at the University of Colorado Boulder, the Canadian Arctic may be seeing its warmest century in as many as 115,000 years.

"The Arctic is currently warming two to three times faster than the rest of the globe, so naturally, glaciers and ice caps are going to react faster," Simon Pendleton, lead author and a doctoral researcher in CU Boulder's Institute of Arctic and Alpine Research (INSTAAR), said in a statement.

Pendleton and colleagues' research is based on plants collected at the edge of ice caps on Baffin Island, the fifth largest island in the world. The landscape is dominated by deeply incised fjords and high-elevation, low-relief plateaus. The latter conserves lichens and moss in their original position in the ice for periods of time lasting thousands of years – a little like a cryogenic chamber.

Previous observations indicate that foliage is soon "removed" from the environment once it loses that protective ice layer, either by meltwater in the summertime or wind-blown snow in winter. This lets scientists make a reasonable assumption that vegetation collected today is vegetation that has been covered in ice since its original growth period. As such, it offers a pretty decent barometer for how far and how quickly glaciers are retreating.

"We travel to the retreating ice margins, sample newly exposed plants preserved on these ancient landscapes and carbon date the plants to get a sense of when the ice last advanced over that location," Pendleton explained.

"Because dead plants are efficiently removed from the landscape, the radiocarbon age of rooted plants define the last time summers were as warm, on average, as those of the past century."

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