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Yereth Rosen

The world’s most acidic ocean waters are found in the winter in the Bering Sea, according to studies by scientists at Columbia University’s Lamont-Doherty Earth Observatory who have released a series of maps tracking changes in global marine acidity...

Yereth Rosen

Oil companies spent big money Wednesday for rights to explore the Colville River Delta and other state territory, making this year’s North Slope auction the richest Alaska state lease sale in 21 years...

Yereth Rosen

Though Arctic Alaska is warming and permafrost is thawing, the area so far has been spared from the scourge of excessive methane emissions, according to data collected by a NASA-managed research project.

Concentrations of methane measured in the atmosphere over Alaska from May to September 2012 -- the first of five seasons for NASA’s Carbon in Arctic Reservoirs Vulnerability Experiment , or CARVE -- turned out to be about equal to the global average for a similar-sized area.

The findings, gleaned from more than 30 airborne-measurement flights, were published last week in the Proceedings of the National Academy of Sciences...

Yereth Rosen

The polar bear population in the southern Beaufort Sea -- considered one of the populations most vulnerable to reductions in Arctic sea ice -- dropped by roughly 40 percent between 2001 and 2010, according to a new study by U.S. and Canadian scientists.

The bears fared especially poorly in the middle of the decade, according to the study, published online in the journal Ecological Applications . The population of youngest bears was most hurt, with few surviving in the years 2004 to 2006, according to the study...

Yereth Rosen

Miners were pulling gold out of eastern Alaska even before the thousands of fortune-hunters rushed north to the Klondike gold fields right next door in Canada’s Yukon Territory.

But more than a century later, no one is entirely sure of the precise geologic source of gold in the Ladue River unit, which includes Alaska’s historic Fortymile mining district , among others.

While maps of Canada’s Klondike region just to the east are up-to-date and precise, thanks to periodic fine-tuning with new surveys and modern technology, geologic maps for the Alaska area right across the border are less detailed and do not match the Canadian side...

Yereth Rosen

The company that acquired the scandal-plagued Alaska oilfield services firm Veco in 2007 now plans to sell some of its Alaska business interests, along with its oil and gas operations on Russia’s Sakhalin Island.

Colorado-based CH2M Hill said Wednesday it “intends to explore strategic alternatives for the portion of its oil, gas and chemicals business” located in and serving Alaska and Sakhalin...

Yereth Rosen

A federal appeals court on Wednesday threw out a Royal Dutch Shell lawsuit that was intended to inoculate the company’s oil-spill plans from challenges by environmentalists.

The 9th U.S. Circuit Court of Appeals said Shell’s 2012 lawsuit against numerous environmental groups, including Greenpeace and the Center for Biological Diversity, represented a “novel legal strategy” but violated the U.S. Constitution...

Yereth Rosen

Polar bears looking for mates appear to be following their noses over the sea ice, according to a newly published study .

Like brown and black bears, polar bears make a practice of sniffing scents left behind by other members of their species. But unlike brown and black bears, which leave their odors on trees or other vertical surfaces, polar bears have to rely on paw prints left on the horizontal surface of snow-covered ice...

Yereth Rosen

Columbia Glacier , one of Alaska’s best-known, most-viewed and fastest-changing glaciers, has retreated so far back that it is now separated into two sections, a transformation captured by satellite imagery.

NASA’s Earth Observatory has compiled a time-lapse series of images that shows changes to Columbia Glacier between 1986 and now, a period of rapid retreat...

Yereth Rosen
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Columbia Glacier, one of Alaska’s best-known, most-viewed and fastest-changing glaciers, has retreated so far back that it is now separated into two sections, a transformation captured by satellite imagery...

Yereth Rosen

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