It’s taken five years to figure it out, but apparently climate change is even worse than the last time we thought it was worse. Who knew? Once upon a time, glaciers were at a constant perfect position. Life was paradise on Earth and all the animals were happy. But then mankind built that first planet-destroying coal powered station in 1880 and now mountains are being moved, the Earth is changing.
Or at least, that’s sort of what the press release implies. What this tale is really about is the way the media hyperbole is just another excuse to repeat The Climate Mantra even if has nothing much to do with what the paper. What were those observations again?
If Nature, the formerly esteemed journal, was half what it used to be, it would have helped young Michele Koppes keep a longer term perspective, and not lace the press release with baseless speculation. Probably she’s seen a few too many Greenpeace-BBC specials and thinks Antarctica is warming (when the satellites show it isn’t). And curiously, the part that is warming happens to be right over the edges of the tectonic plates where the volcanoes are. She might think climate models work too.
The paper itself might reveal some new insight about the world, but the press release is just untested assumptions extrapolated ad absurdio.
Global warming can alter shape of the planet, as melting glaciers erode the land
Climate change is causing more than just warmer oceans and erratic weather. According to scientists, it also has the capacity to alter the shape of the planet.
In a five-year study published today in Nature, lead author Michele Koppes, assistant professor in the Department of Geography at the University of British Columbia, compared glaciers in Patagonia and in the Antarctic Peninsula. She and her team found that glaciers in warmer Patagonia moved faster and caused more erosion than those in Antarctica, as warmer temperatures and melting ice helped lubricate the bed of the glaciers.
“We found that glaciers erode 100 to 1,000 times faster in Patagonia than they do in Antarctica,” said Koppes. “Antarctica is warming up, and as it moves to temperatures above 0 degrees Celsius, the glaciers are all going to start moving faster. We are already seeing that the ice sheets are starting to move faster and should become more erosive, digging deeper valleys and shedding more sediment into the oceans.”
The repercussions of this erosion add to the already complex effects of climate change in the polar regions. Faster moving glaciers deposit more sediment in downstream basins and on the continental shelves, potentially impacting fisheries, dams and access to clean freshwater in mountain communities. “The polar continental margins in particular are hotspots of biodiversity,” notes Koppes. “If you’re pumping out that much more sediment into the water, you’re changing the aquatic habitat.”
The Canadian Arctic, one of the most rapidly warming regions of the world, will feel these effects acutely. With more than four degrees Celsius of warming over the last 50 years, the glaciers are on the brink of a major shift that will see them flowing up to 100 times faster if the climate shifts above zero degrees Celsius.
The findings by Koppes and coauthors also settle a scientific debate about when glaciers have the greatest impact on shaping landscapes and creating relief, suggesting that they do the most erosive work near the end of each cycle of glaciation, rather than at the peak of ice cover. The last major glacial cycles in the Vancouver region ended approximately 12,500 years ago.
The study, Observed latitudinal variations in erosion as a function of glacier dynamics, appears in Nature.