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Overland : Arctic Melt Means Less Snow – Overland : Arctic Melt Means More Snow

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Steven Goddard
Real Science

Feb 8, 2011

James Overland 2004 :

When scientists trained their analytical tools on the North Pole and its environs, they quantified the local knowledge: The polar ice cap is 40 percent thinner and millions of acres smaller than it was in the 1970s.

What happens at the North Pole can affect the rest of the planet, potentially altering the course of the Gulf Stream, which moderates climate from the East Coast of the United States to the British Isles. Closer to home, the jet stream that dictates much of Seattle’s weather can be diverted when the polar vortex speeds up.

“It’s probably contributing to the fact that it’s warmer and we’ve been getting less snow,” Overland said.

http://seattletimes.nwsource.com/html/localnews/2001910590_northpole23m.html

James Overland 2011 :

Our region experienced record snowfall last winter, topping the charts dating at least as far back as the late 1800s. In all, more than six feet of snow fell at sites such as Baltimore-Washington International Marshall Airport. Extreme weather nailed other U.S. cities last winter, too, and swaths of Europe saw unprecedented snowfalls and record cold temperatures. This year, the nation’s capital has suffered one unusually severe storm. Parts of the East Coast from Atlanta to Boston have been experiencing blizzard conditions. Last week, a vast swath of the country’s midsection and East Coast got deluged with sleet and snow, paralyzing travel. What gives?

To understand how warming and snowstorms may be connected, it helps to start with the epicenter of winter weather. Around the North Pole, some of the world’s coldest air currents blow in what’s typically a tight loop known as the polar vortex. Air masses inside the vortex tend to have not only low temperatures but also low barometric pressures compared with air outside the vortex. The surrounding high-pressure zones push in on the vortex from all sides, helping the cold air stay where it belongs, at the top of the world.

……

  • A d v e r t i s e m e n t

The root of the problem, Overland says, is melting sea ice. Sea ice forms in the Arctic Ocean during the cold, dark days of fall and winter and hangs around, melting slowly but not completely vanishing, throughout the summer. In recent years, more sea ice has melted during the warm months than can be replenished during the chillier ones.

http://www.washingtonpost.com/

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This article was posted: Tuesday, February 8, 2011 at 5:28 am





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