Arctic

Greenland to sprout new shades of green as planet warms, study says

Publication: NBC News   Date: August 28, 2013   View Article

Scientists have long expected Greenland to get greener as the planet warms. Now they have a better idea of what trees will be able to take root on the Arctic island as the glaciers there retreat inland over the course of this century.

Newly published research shows that human assistance will be key to the spread of any trees over the coming decades.

Greenhouse gas escaping in the Arctic could cause economic harm, experts say

Publication: NBC News   Date: July 24, 2013   View Article

Methane bubbling to the surface as the Arctic sea ice retreats could have catastrophic consequences for the global economy, a team of researchers argue in a new paper. To avoid the economic pain measured in tens of trillions of dollars over the coming century will “require major reductions in global emissions” of greenhouse gases, the team concludes.

The economic fallout will come from an added uptick in extreme weather, rising seas, reduced crop yields and other impacts already associated with global climate change.

Ice-free Arctic may come as soon as 2054, study says

Publication: NBC News   Date: July 15, 2013   View Article

Cruise ships and oil tankers may be sailing through ice-free waters of the Arctic as early as 2054, according to a new study that narrows to a handful of years the uncertainty of when this climate-change milestone will occur. Previous studies have pegged it to everywhere between 2015 and 2100.

The implications of an ice-free Arctic range from loss of habitat for polar bears and seals to a surge in extreme weather around the world and an acceleration of global climate change, according to Arctic experts.

It also matters for ships, noted study leader Jiping Liu, an assistant professor in the department of atmospheric and environmental sciences at the State University of New York at Albany. “If the Arctic is totally ice free, you don’t need to go through a specific route, you can go anywhere,” he told NBC News.

Ice-free Arctic in our future, ancient climate record suggests

Publication: NBC News   Date: May 9, 2013   View Article

About 3 million years ago, evergreen forests — not tundra — carpeted the Arctic, Greenland was green, and sea ice only formed for a few months in the winter, if it formed at all, according to analysis of sediment pulled from a Russian lake.

“Where we are going is into this warmer world,” Julie Brigham-Grette, a geologist at the University of Massachusetts Amherst, told NBC News.

At the time — the Pliocene — concentrations of the greenhouse gas carbon dioxide were around 400 parts per million, the same as they are today. But Arctic temperatures were about 14.4 degrees Fahrenheit (8 degrees Celsius) warmer than today, explained Brigham-Grette, who led the analysis.

Arctic change reverberates around globe, experts say

Publication: NBC News   Date: March 26, 2013   View Article

Most of the sea ice that forms each fall and winter in the Arctic now melts each spring and summer, a recent change that is impacting global patterns of weather and trade as well as the U.S. military’s strategic planning, experts told reporters during a briefing Tuesday.

“There are tremendous two-way and multiple interactions between the Arctic and the rest of the world,” retired Rear Adm. David Titley said during the teleconference organized by Climate Nexus, a group trying to raise awareness about climate change.

Global warming to open ‘crazy’ shipping routes across Arctic

Publication: NBC News   Date: March 4, 2013   View Article

By the middle of this century, thanks to climate change, anyone with a light icebreaker can spend their Septembers going anywhere they want in the Arctic Ocean, including straight over the North Pole, according to a new study.

Ordinary vessels, which account for more than 99 percent of shipping traffic, could easily navigate the Northern Sea Route along the Russian coastline and, in some years, even find a route through the fabled Northwest Passage.

“That’s kind of crazy and, frankly, a little bit worrisome,” Laurence C. Smith, a geographer and sea ice expert at the University of California, Los Angeles, told NBC News. “It is not like these will be open blue seas and safe or open year round.”

Hawaii to suffer most as global sea levels rise, study says

Publication: NBC News   Date: February 21, 2013   View Article

Melting ice in Greenland, Antarctica and elsewhere will push up seas unevenly around the world, according to a new study that finds some of the highest waters will inundate Honolulu, Hawaii.

At the poles, sea levels will actually fall because of the way sea, land and ice interact. For example, the sheer mass of water held in ice in Greenland and Antarctica generates a gravitational field that pulls in the surrounding water. As ice there melts, the gravitational pull weakens and the water is redistributed.

© 2008-2010 Collected Writings By John Roach