Featured Research

from universities, journals, and other organizations

Rising Surface Temperatures Drive Back Winter Ice In Barents Sea, Researchers Find

Date:
September 20, 2007
Source:
Rutgers, the State University of New Jersey
Summary:
Rising sea-surface temperatures in the Barents Sea, northeast of Scandinavia, are the prime cause of the retreating winter ice edge over the past 26 years, according to new research. The recent decreases in winter ice cover is clear evidence that Arctic pack ice will continue on its trajectory of rapid decline, Francis said.

Rising sea-surface temperatures in the Barents Sea, northeast of Scandinavia, are the prime cause of the retreating winter ice edge over the past 26 years, according to research by Jennifer Francis, associate research professor at Rutgers’ Institute of Marine and Coastal Sciences (IMCS). The recent decreases in winter ice cover is clear evidence that Arctic pack ice will continue on its trajectory of rapid decline, Francis said.

In a paper published in Geophysical Review Letters, Francis and Elias Hunter, a research specialist in Francis’ laboratory, found that the rising average winter-time sea-surface temperature of the Barents Sea – up 3 degrees Celsius since 1980 – is likely driven by increasing greenhouse gases, which in turn are melting more ice. Francis and Hunter used satellite information dating back 26 years to perform their study.

Scientists have known for some time that the extent of perpetual, summer ice cover in the Arctic has been shrinking, but until the past few years, the average amount of winter ice has been relatively steady. The winter ice amount is important because if it begins to decrease, scientists believe it is an indicator that enough extra heat from the sun is being absorbed in summer in new open water areas so that the ice grows less in winter and is more easily melted the following summer, leading to even less summer ice.

The record-breaking ice loss this year is further, dramatic evidence that this process is underway. While satellites can see the recent winter ice retreat, no one knew until now what was driving the ice back. Francis said she and Hunter were surprised when they discovered that warming ocean temperatures – and not atmospheric effects – were the main source of winter ice retreat, and that the warming is linked to general rising temperatures of the Atlantic Ocean via the Gulf Stream, which brings Atlantic water into the Barents Sea.

“In the Barents Sea, I expected more influence from atmospheric heating; but it [the retreat of the ice edge] seems to be governed almost entirely by warming from the ocean,” Francis said.

Should the warming trend continue -- and all indications are that it will -- there would be considerable economic and political implications. “Fishing, shipping, oil exploration will all be easier to do in the Arctic if there is less ice around for a shorter time,” Francis said.

Francis and Hunter were in for another surprise in the Bering Sea, between Alaska and Siberia. That sea is virtually cut off from the Pacific Ocean by the Aleutian Islands. The researchers expected the ice edge there to be pushed around by northerly and southerly winds, but that wasn’t the case. Instead, it was the strength or weakness of the Aleutian Low – a semi-permanent storm with predominantly easterly winds in much of the Bering Sea – that determined the ice edge. In years when the low was weak – when the east wind didn’t blow as hard – the ice edge crept farther south.

In years when the east winds blew hard, the ice edge retreated northward. The strength of the Aleutian Low oscillates in cycles lasting 10 to 20 years, Francis said, and right now, appears to be in a weak cycle. That means that the ice edge in the Bering Sea, not exposed to the world’s ocean system like its Barents Sea counterpart, has not retreated as much. Computer models predict, however, that the Aleutian Low will strengthen as the global climate system adapts to increasing greenhouse gases.


Story Source:

The above story is based on materials provided by Rutgers, the State University of New Jersey. Note: Materials may be edited for content and length.


Cite This Page:

Rutgers, the State University of New Jersey. "Rising Surface Temperatures Drive Back Winter Ice In Barents Sea, Researchers Find." ScienceDaily. ScienceDaily, 20 September 2007. <www.sciencedaily.com/releases/2007/09/070917172937.htm>.
Rutgers, the State University of New Jersey. (2007, September 20). Rising Surface Temperatures Drive Back Winter Ice In Barents Sea, Researchers Find. ScienceDaily. Retrieved September 30, 2014 from www.sciencedaily.com/releases/2007/09/070917172937.htm
Rutgers, the State University of New Jersey. "Rising Surface Temperatures Drive Back Winter Ice In Barents Sea, Researchers Find." ScienceDaily. www.sciencedaily.com/releases/2007/09/070917172937.htm (accessed September 30, 2014).

Share This



More Earth & Climate News

Tuesday, September 30, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Raw: Balloon Descends to Bottom of Croatian Cave

Raw: Balloon Descends to Bottom of Croatian Cave

AP (Sep. 29, 2014) An Austrian balloon pilot has succeeded in taking a balloon deep underground, a feat which he believes is a world first. (Sept. 29) Video provided by AP
Powered by NewsLook.com
Bodies Recovered from Japan Volcano Eruption

Bodies Recovered from Japan Volcano Eruption

AP (Sep. 29, 2014) Rescue crews finished recovering the remaining 27 bodies from atop Japan's Mount Ontake Monday. At least 31 people were killed Saturday in the mountain's first fatal volcanic event in modern history. (Sept. 29) Video provided by AP
Powered by NewsLook.com
Raw: Japan's Mount Ontake Erupts

Raw: Japan's Mount Ontake Erupts

AP (Sep. 27, 2014) A volcano erupted in central Japan on Saturday, sending a large plume of ash high into the sky and prompting a warning to climbers and others to avoid the area. (Sept. 27) Video provided by AP
Powered by NewsLook.com
California University Designs Sustainable Winery

California University Designs Sustainable Winery

Reuters - US Online Video (Sep. 27, 2014) Amid California's worst drought in decades, scientists at UC Davis design a sustainable winery that includes a water recycling system. Vanessa Johnston reports. Video provided by Reuters
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:

Breaking News:

Strange & Offbeat Stories


Plants & Animals

Earth & Climate

Fossils & Ruins

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile: iPhone Android Web
Follow: Facebook Twitter Google+
Subscribe: RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins