Posted on January 12, 2016 by Bob Berwyn
Antarctic sea ice is back to a near average extent after running well above average for several years. @bberwyn photo.
End of year heat wave slowed expansion
Arctic sea ice extent in December ended up as the fourth-lowest on record, and is still hovering near a record low in mid-January, according to the latest monthly update from the National Snow and Ice Data Center.
Through 2015, the linear rate of decline for December sea ice extent is 3.4 percent per decade (about 17,000 miles) per year.
For the month, the sea ice extent averaged 4.74 million square miles, about 301,000 square miles below the 1981 to 2010 average for the month. The rate of sea ice growth slowed slightly throughout December and nearly stopped early in January, federal ice trackers said, suspecting that a period of unusually warm temperatures in the Arctic caused the slowdown. Continue reading
Filed under: Arctic, climate and weather, climate change, El Niño, extreme weather, global warming | Tagged: Arctic sea ice, climate change, El Nino, Environment, global warming, North Pole, sea ice extent | Leave a comment »
Posted on March 5, 2013 by Bob Berwyn
The fastest navigation routes for ships seeking to cross the Arctic Ocean by mid-century include the Northwest Passage (on the left) and over the North Pole (center), in addition to the Northern Sea Route (on the right).
New study looks at Arctic sea ice projections and also explores geopolitical issues
By Summit Voice
FRISCO — A new study helps quantify some of recent speculation about shipping routes through the Arctic, indicating that, in 40 years, normal seagoing vessels will be able to navigate previously inaccessible parts of the Arctic Ocean without the help of icebreakers.
The Arctic ice sheet is expected to thin to the point that polar icebreakers will be able to navigate between the Pacific and Atlantic oceans by making a straight shot over the North Pole, according to UCLA geographers Laurence C. Smith and Scott R. Stephenson. Continue reading
Filed under: Arctic, climate and weather, global warming, world news | Tagged: Arctic sea ice, Arctic shipping, climate change, global warming, North Pole, Northern Sea Route, Northwest Passage | Leave a comment »
Posted on March 6, 2011 by Bob Berwyn
Arctic sea ice extent for February 2011 was 14.36 million square kilometers (5.54 million square miles). The magenta line shows the 1979 to 2000 median extent for that month. The black cross indicates the geographic North Pole.
Northern hemisphere snow cover well above average
By Summit Voice
SUMMIT COUNTY — Arctic sea ice extent in February tied with 2005 for lowest on record since 1979, when satellite measurements began. Ice covered about 5.54 million square miles of the Arctic area, about half a million square miles below the average.
The sea ice extent was below average in both the Atlantic and Pacific sectors, especially in the Labrador Sea and the Gulf of St. Lawrence, according to the monthly update from the National Snow and Ice Data Center. Here’s an excerpt:
“While ice extent has declined less in winter months than in summer, the downward winter trend is clear. The 1979 to 2000 average is 15.64 million square kilometers (6.04 million square miles). From 1979 through 2003, the February extent averaged 15.60 million square kilometers (6.02 million square miles). Every year since 2004 has had a mean February extent below 15 million square kilometers (5.79 million square miles).” Continue reading
Filed under: climate and weather, global warming | Tagged: Arctic Oscillation, Arctic sea ice, Arctic sea ice February 2011, climate, climate change, Environment, global warming, Harp Seal, Labrador Sea, Measurement of sea ice, National Snow and Ice Data Center, North Pole, Rutgers global snow lab, Summit County News | 2 Comments »