Between 2005 to 2015, surface melt off ice caps and glaciers of the Queen Elizabeth Islands grew from an average of three gigatons to 30 gigatons
The Greenland Ice Sheet isn’t the only place melting under a thickening blanket of heat-trapping greenhouse gases. A new study shows that Canada’s Arctic glaciers are also shedding ice at a rapidly increasing rate, making them a big factor in global sea level rise.
In a new study, glaciologists with the University of California, Irvine said that, between 2005 to 2015, surface melt off ice caps and glaciers of the Queen Elizabeth Islands grew by 900 percent, from an average of three gigatons to 30 gigatons per year, according to findings published last week in the journal Environmental Research Letters. Continue reading “Arctic warmup speeds Canada glacier meltdown”→
Just small increases in ocean temperatures during past geological epochs may have been enough to tip Northern Hemisphere ice sheets toward disintegration, even as air temperatures remained cold. That could spell trouble in the current era of climate warming, according to a new study led by University of Michigan researchers, who said their finding suggest that climate change could cause sea level to rise higher than most models predict. Continue reading “Study says ice sheets can crumble quickly”→
New CSU study eyes regional climate cycle as one factor
This year’s rapid loss of sea ice around Antarctica may make the floating ice shelves along the coast of the continent even more vulnerable to collapse, and a Hemisphere climate cycle known as the Southern Annular Mode is probably a factor in the equation.
As scientists learn more about the dynamics of the ocean around Antarctica, they’ve discovered a climate warming signal. Distinct layers of water, marked by temperature boundaries, are forming right now, leading to conditions similar to about 14,000 years ago, when Antarctic ice sheets melted rapidly, raising global sea level by more than 10 feet. Continue reading “Ocean layering around Antarctica could signal major meltdown”→
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?”→
The goal of limiting atmospheric carbon dioxide to 350 parts per million — considered the environmentally “safe” level, just moved a little farther away. Scientists tracking concentrations of the heat-trapping pollutant at a mountaintop lab in Hawaii said last week that CO2 concentrations jumped by the largest annual amount recorded since measurements began 56 years ago.
The reading comes from NOAA’s Mauna Loa Observatory, and researchers said the latest increase was the fourth year in a row that CO2 concentrations grew by more than 2 parts per million, according to a press release from NOAA.
Study pinpoints changes in global hydrological cycle
As crucial as it is for the future of humanity, calculating the rate of sea level rise has never been easy, and new measurements by NASA satellites have added a new twist to the equation. Careful study of the data from NASA’s twin NASA’s Gravity Recovery and Climate Experiment (GRACE) satellites helped show how climate-driven increases of liquid water storage on land have affected the rate of sea level rise.