Arctic ice loss may drive extreme weather patterns

I believe TOP scientists over commentators at FOX News that are paid by the big oil industry!

By Monte Morin
March 26, 2013, 12:18 p.m.



Anyone forced to shovel their
car out of a snowbank this winter might wonder just how it is a
blizzard can occur in a warming climate.

The answer, climate scientists say, may have to do with record sea ice losses in the Arctic.

At a Tuesday news conference, several researchers said that warming
conditions in the Arctic may be weakening jet stream currents and
causing extreme weather systems to linger in northern mid-latitudes.

"Ironically ... as the ice
pack retreats and the Arctic heats up, there's a counteracting tendency
in middle latitudes for colder winters, as well as hotter summers," said
Stephen Vavrus, senior scientist at the Nelson Institute for
Environmental Studies at the University of Wisconsin.

The jet stream is a band of very strong winds that blow from west to
east, several miles above the earth's surface. Normally, these powerful
winds push weather systems around, preventing them from staying in one
place for very long.

However, the loss of sea ice in recent decades has allowed Arctic
waters to absorb more heat energy from the sun, which has in turn heated
the atmosphere above the water, according to Vavrus.

This heating influences atmospheric pressure and appears to be
slowing the westerly jet stream, Vavrus said. Instead of flowing quickly
and in a relatively straight line, like a river down a mountain, the
winds mimic a slower, meandering river.

"When that happens during winter, there's less warm air that gets
transported over land," Vavrus said. "That essentially helps to
refrigerate the land during the wintertime and we get snow and more cold
and more extreme cold as well."

Arctic sea ice is referred to as the planet's air conditioner, due to
its influence on global temperatures. Last year, Arctic sea ice reached
its lowest level in the satellite age.

This rate of sea ice loss is faster than what models predicted. Now,
some experts say, the Arctic could experience a nearly ice-free summer
by 2020.

"We are in the process right now of going to a new state in the Arctic," said David Titley, chief operations officer at NOAA and a retired Navy rear admiral.

Vavrus and Titley were among a handful of experts who spoke on
changes in Arctic sea ice during a news conference organized by the
environmental group Climate Nexus.