Arctic ice more vulnerable to sunny weather, new study shows
Washington, Apr 23 (UNI) Extream summer sunshine is depleting the Arctic ice sheets, claims researchers.
Unusually sunny weather contributed to last summer's record loss of Arctic ice, while similar weather conditions in past summers do not appear to have had comparable impacts.
''In a warmer world, the thinner sea ice is becoming increasingly sensitive to year-to-year variations in weather and cloud patterns,'' said the lead author Jennifer Kay.
''A single unusually clear summer can now have a dramatic impact,'' he said.
The findings indicate that summer sunshine in the Arctic produces more pronounced melting than in the past, largely because there is now less ice to reflect solar radiation back into space.
As a result, the presence or absence of clouds now has greater implications for sea ice loss.
Satellite data offer clues to record-shattering 2007 melt Last summer's loss of Arctic sea ice set a modern-day record, with the ice extent shrinking to a minimum of about 1.6 million square miles (4.1 million square kilometers) in September.
That was 43 per cent less ice coverage than in 1979, when accurate satellite observations began.
''Our
research
indicates
that
the
relative
importance
of
solar
radiation
in
the
summer
is
changing,''
Kay
said
adding
''The
sunshine
reaching
the
Arctic
is
increasingly
influential,
as
there
is
less
ice
to
reflect
it
back
into
space.
Dry,
sunny
conditions
in
a
single
summer
can
now
act
as
a
potent
force
to
melt
sea
ice.''
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