Tag: Sea ice

Antarctic sea ice peaks near record-low extent

Australian scientists document early start to melt season

Yes, there is still lots of ice in Antarctica, but it's melting faster than ever. bberwyn photo.
Yes, there is still lots of ice in Antarctica, but it’s melting faster than ever. bberwyn photo.
Antarctic sea ice extent was near a record low in late September and early October. Via NSIDC.

Staff Report

Australian scientists say Antarctic sea ice started its annual spring retreat early this year and has set new daily record lows for extent during late September — during the Austral spring, when Antarctic sea ice is at a maximum.

In a press release, the Antarctic Climate & Ecosystems Cooperative Research Centre said the sea ice extent started its annual retreat early, just two years after  winter sea ice extent around Antarctica reached a new record high in September 2014, when it exceeded 20 million square kilometres for the first time since satellite measurements began in 1979.

This year, Antarctic sea ice began its annual spring retreat about four weeks earlier than average, after peaking at 18.5 million square kilometres on 28 August 2016, which was close to the lowest winter maximum on record.

Continue reading “Antarctic sea ice peaks near record-low extent”

2014 Arctic report card documents ongoing global warming impacts

A NASA Blue Marble view of Earth, with Greenland parts of the Arctic visible top-center.

Arctic warming twice as fast as rest of the planet

Staff Report

FRISCO — Parts of the Arctic Ocean are warming by nearly 1 degree Fahrenheit every decade, and overall, Arctic temperatures are rising twice as fast the global average, climate scientists said today as they released results of an annual Arctic Report Card.

The report documents increasing air and sea surface temperatures, declining reflectivity at the surface of the Greenland ice sheet, which reached a new record low last summer. And there is ongoing shrinkage of  spring snow cover on land and summer ice on the ocean.

The warming Arctic atmosphere was strongly connected to lower latitudes in early 2014 causing cold air outbreaks into the eastern USA and warm air intrusions into Alaska and northern Europe. Continue reading “2014 Arctic report card documents ongoing global warming impacts”

Study tracks big drop in Pacific walrus numbers

PHOTO: U.S. GEOLOGICAL SURVEY Melting Arctic sea ice is forcing walrus colonies into a shore-bound existence to which they aren't adapted. Scientists say they've documented several cases of young calves being trampled in stampedes.
 Melting Arctic sea ice is forcing walrus colonies into a shore-bound existence to which they aren’t adapted. Photo courtesy USGS.

Melting sea ice likely a factor in population decline

Staff Report

FRISCO — With a 2017 endangered species listing deadline looming, federal researchers are trying to pinpoint Pacific walrus population numbers. In the newest study, the U.S. Geological Survey said the population dropped by about half between 1981 and 1999, but scientists aren’t sure if the numbers have stabilized since then.

in 2011, the U.S. Fish and Wildlife Service acknowledged that the species was under pressure from sea ice loss and over-harvesting, but didn’t formally add the Pacific walrus to the endangered species list. A federal court said the agency must make a final determination by 2017. Continue reading “Study tracks big drop in Pacific walrus numbers”

Online Arctic sea ice atlas unveiled

Tracking Arctic ice. Image courtesy NASA’s Blue Marble website.

New tool to help coastal and ocean planners in the region

By Summit Voice

FRISCO — With Arctic sea ice at an all-time record low for late January and the melt season about to begin, researchers have created a new online tool that helps put ice conditions in historical perspective. Continue reading “Online Arctic sea ice atlas unveiled”

Global warming: More coastal habitat for geese in Alaska due to rising temperatures, melting sea ice

A family of black brant geese in Alaska, Photo courtesy USGS.

Some species may benefit from climate change

By Summit Voice

FRISCO — Dwindling sea ice spells trouble for polar bears and walrus colonies, but some other animals are benefiting from global warming — at least for now.

Warming temperatures have resulted in more high quality habitat for geese along the Arctic coast of Alaska, according to a U.S. Geological Survey study.

The research focused on  black brant geese that migrate by the thousands each summer to the Arctic Coastal Plain of Alaska to undergo their wing molt, during which time the birds are flightless for three weeks. This molting period requires high quality food to give the birds the energy necessary to replace worn feathers and also extensive open water areas where birds can escape from predators. Continue reading “Global warming: More coastal habitat for geese in Alaska due to rising temperatures, melting sea ice”

Climate: Winds driving Antarctic sea ice growth

Global warming likely to reverse trend in coming decades

Antarctic sea ice extent has been growing the past few decades, bberwyn photo.

By Summit Voice

FRISCO — Climate scientists have long suspected that increasing winds around Antarctica have been the main cause of growing sea ice extent in the southern hemisphere, and new research from the University of Washington shows how and why that might be happening — even as overall global temperatures warm.

Global warming deniers have tried to use the growth of Antarctic sea as a weapon in their battle against science, but climate researchers point out that the loss of Arctic sea ice far outweighs the small increase in the southern hemisphere. And the new research suggests that, as global temperatures continue to increase, Antarctic sea ice is all but certain to start shrinking.

Overall, Antarctic sea ice has been increasing by about 1 percent annually, which has led to record sea ice extent in the region the past few years. As of September 16, Antarctic sea ice extent reached about 7.51 million square miles, a record for the date and about 3.9 percent above the 30 year average. By contrast, this year’s Arctic summer minimum ice extent is approximately 30 percent below the 30-year average. Continue reading “Climate: Winds driving Antarctic sea ice growth”

Climate: Parts of the Arctic getting greener

Researchers are trying to identify the consequences of dwindling sea ice. Photo courtesy University of Alaska Fairbanks.
Researchers are trying to identify the consequences of dwindling sea ice. Photo courtesy University of Alaska Fairbanks.

Study shows fundamental ecosystem changes under way

By Summit Voice

Sea ice decline is already changing some Arctic ecosystems in fundamental ways, according to University of Alaska Fairbanks scientists. As part of review team, the two researchers showed, for example, that disappearing sea ice leads to a loss of sea-ice algae, at the very base of the Arctic marine food web. Larger plankton is thriving, replacing smaller, but more nutrient dense plankton. What that means exactly is not yet understood.

“Our thought was to see if sea ice decline contributed to greening of the tundra along the coastal areas,” said Uma Bhatt, an associate professor with UAF’s Geophysical Institute. “It’s a relatively new idea.” Continue reading “Climate: Parts of the Arctic getting greener”