Scientists may not have to wait too much longer to observe firsthand the effects of global warming on Greenland’s ice sheets. One of the largest glaciers in Greenland entered “a phase of accelerated retreat in 2012,” and may be near a climate tipping point, according to new research published in the current issue of Science.
After studying the Zachariae Isstrom, scientists with the University of California, Irvine, said it’s starting to break up.
“North Greenland glaciers are changing rapidly,” said Jeremie Mouginot, an assistant researcher with UCI’s department of earth system science. “The shape and dynamics of Zachariae Isstrom have changed dramatically over the last few years. The glacier is now breaking up and calving high volumes of icebergs into the ocean, which will result in rising sea levels for decades to come.” Continue reading “Are Greenland glaciers on the verge of crumbling?”→
Researchers try to pinpoint sea level rise projections
By Bob Berwyn
FRISCO — Sea level is set to rise at least three feet during the next few decades, NASA scientists and ice researchers said this week, updating their latest research and findings on how fast the world’s ice sheets and glaciers are melting.
The scientists said they’re still not sure exactly how fast the water will rise, but they’re getting closer to nailing down the timing, thanks to several ongoing research projects, including a five-year effort to measure ice loss around the edge of Greenland.
Influx of cold, fresher water could tip climate scale
FRISCO — Earth scientists have long speculated that a massive infusion of cold and relatively fresh water into the North Atlantic could disrupt a key climate-regulating ocean current, with huge consequences for adjacent land areas.
New measurements of ocean temperatures in the region, along with other climate data, now suggest that the Atlantic Overturning Current has already slowed quite a bit in the past 100 years, and especially since 1970. The current, which is related to the Gulf Stream, helps moderate temperatures in northwestern Europe and northeastern North America.
New study shows link between Pacific Ocean hotspot and North Atlantic weather patterns
FRISCO — Climate researchers and glaciologists have long been tracking the meltdown of Greenland’s glaciers. The region has been warming at the astounding rate of about 1 degree Celsius per decade — several times the global average — but part of that may be due to natural variability, according to a new study led by University of Washington scientists.
FRISCO — At least some parts of the Greenland ice sheet likely survived some of the warmest interludes in the Earth’s geologic climate history, researchers said last week as they announced findings of a study that discovered an ancient tundra landscape preserved under the Greenland Ice Sheet, below two miles of ice.
“We found organic soil that has been frozen to the bottom of the ice sheet for 2.7 million years,” said University of Vermont geologist and lead author Paul Bierman. The finding provides strong evidence that the Greenland Ice Sheet has persisted much longer than previously known, enduring through many past periods of global warming. Continue reading “Greenland’s ice sheet, past, present and future”→
New data shows at least one glacier moving at a record pace of 50 feet per day
By Summit Voice
FRISCO — Arctic ice researchers say detailed measurements show that one Greenland’s glaciers has been moving at a record speed the past few years.
The scientists with the University of Washington and the German Space Agency measured the movement of the Jakobshavn Isbræ (Jakobshavn Glacier) in 2012 and 2013, concluding that the glacier is moving four times as fast as during the 1990s.
‘The warming we are seeing is outside any kind of known natural variability, and it has to be due to increased greenhouse gases in the atmosphere …’
By Summit Voice
FRISCO — After radiocarbon dating samples of moss at the edge of melting ice caps on Baffin Island, scientists said there’s little doubt that current warming in the Arctic is unprecedented, even on a geological time scale.
Average summer temperatures in the Eastern Canadian Arctic during the last 100 years are higher than during any century in the past 44,000 years and perhaps as long ago as 120,000 years, according to a University of Colorado Boulder study.