New study suggests rapid meltdown during post-ice age warming
After taking a close look at rocks from West Antarctica’s dramatic Ellsworth Mountains, climate researchers say there’s a chance that ice sheets in the region could melt quickly as the planet warms, potentially causing sea level to rise by six to eight feet.
The new study, published in Nature Communications, took a close look at Antarctic climate change about 21,000 years ago during a period of warming after the coldest point of the most recent Ice Age. They found that the West Antarctic Ice Sheet reached a tipping point, after which it thinned relatively quickly, losing 400m of thickness in 3,000 years. Continue reading “What’s the tipping point for Antarctica’s ice sheets?”→
British researchers say regional patterns of melting of glaciers on the Antarctic Peninsula are linked with warming oceans in the region. The Antarctic Peninsula is one of the biggest contributors to sea level rise, so the new finding will help pinpoint how fast and how high seas will rise in the decades ahead.
British Antarctic Survey scientists to monitor impacts of ash deposits
A volcanic eruption in the remote South Sandwich archipelago, near the tip of the Antarctic Peninsula, may threaten the largest known colony of chinstrap penguins, according to scientists with the British Antarctic Survey who have been monitoring the eruption.
The Mt. Curry volcano on Zavodovski Island has been erupting since March, sending ash toward the penguin enclave. The uninhabited island is part of the British Overseas Territory of South Georgia and the South Sandwich Islands. After reports of a 7.2 magnitude earthquake last month, researchers confirmed from satellite imagery that not one, but two volcanoes are erupting in the South Sandwich Islands — Mt. Curry on Zavodovski Island to the north of the archipelago and Mt. Sourabaya on Bristol Island to the south. Continue reading “Eruption poses threat to huge penguin colony”→
Pole to pole and across the world’s oceans and mountains, climate change impacts are adding up
By Bob Berwyn
For any Summit Voice readers not following my Twitter or Facebook feeds, here’s a list of links to my recent stories for InsideClimate News.
Of greatest interest here in the West is a new University of Utah study that projects a dramatic upward shift of the snowline in the Rockies and coastal ranges in California, Oregon and Washington. Less spring snowpack at lower elevations has huge effects on we manage our water, and could also result in more early season wildfires: Unabated Global Warming Threatens West’s Snowpack, Water Supply.
New research suggests that Antarctica’s contribution to sea level rise over the next few decades has been underestimated
By Bob Berwyn
When it comes to the question of how much sea levels will rise in the global warming era, Antarctica is the big, frozen, enchilada.
Just a partial meltdown of the ice shelves along the western fringe of the continent could raise sea level two to three feet in a few hundred years, and more extensive melting of inland ice sheets would send seas surging upward higher and faster than most coastal communities could adapt for.
Until recently, Antarctica’s inland ice fields were deemed as relatively stable, andrecent NASA research even suggested that global warming will increase snowfall over Antarctica and build more ice mass—a process that could slow melting and offset sea level rise.
ESA satellites offer clues about climate change consequences
An analysis of data from European Space Agency satellites shows that Antarctic ice shelves may be losing their buttressing role as they get thinner and retreat inland.
The findings, announced in February, used ice velocity data to show that there is a critical tipping point at which the shelves act like a restraining band, holding back the the ice that flows toward the sea. In a dramatic press release, the ESA said that, if the ice is lost, it could be “point of no return” for Antarctica’s ice.