World warm last year, but not like record US heat
By | Associated Press – 15 hrs ago- View PhotoAssociated Press/Felipe Dana - FILE - In this Friday, Dec. 28, 2012 file photo, the sun sets behind the Christ the Redeemer statue and the Corcovado mountain in Rio de Janeiro, Brazil, two days after the city
WASHINGTON (AP) — While the U.S. was smashing heat
marks last year, the world as a whole barely slipped into the top 10
hottest years on record, two American science agencies said Tuesday.
The global average temperature for last year would have been a record
15 years ago, an indication that what used to be unusual heat is more
commonplace.Now it merely ranks 10th, something climate scientists shows man-made climate change in action.
Last year's average was 58 degrees Fahrenheit (14.5 degrees Celsius), the National Oceanic and Atmospheric Administration said. That's a full degree above the 20th century average of 57 F (13.9 C).
The hottest was 2010 when the average temperature was 58.2 degrees (14.6 degrees Celsius). NOAA records go back to 1880.
"We're playing in a new neighborhood as far as global temperatures
go, compared to even the late 20th century and especially the mid-20th
century," said Deke Arndt, head of monitoring for NOAA's National
Climatic Data Center.
A weather pattern called La Nina
— the flip side of El Nino — and mildness in Alaska, Canada, the United
Kingdom and parts of Asia moderated the globe's average temperature.
The Lower 48 states in the U.S. recorded its hottest year last year with
an average of 55.3 F. (12.9 C)
"In global warming, you expect warming to manifest itself in different locations in any given year," said Andrew Weaver, a climate scientist at the University of Victoria in Canada. "This year it was America's turn to feel the brunt of global warming's growing fury."
NASA,
which measures temperatures differently, ranks 2012 as ninth warmest.
It put the temperature at 58.3 F (14.6 C). Both agencies announced the
data Tuesday.
Some global warming skeptics have claimed the world hasn't warmed in
the last 16 years, but each decade is warmer than the last. Even the
first three years of this decade were warmer than the last, the two
agencies said. Since 1963, NOAA said the global temperature has
increased at a rate of 0.27 degrees Fahrenheit a decade (0.15 degrees
Celsius).
Top NASA climate scientist James Hansen said in the past few years there has been a temporary "apparent standstill in global temperatures"
that is heavily due to more frequent cooling La Ninas. What's
significant, he said, is that temperatures are rising decade by decade.
Hansen and other scientists said the planet is warming because the
world is spewing ever rising amounts of greenhouse gases — mostly carbon
dioxide. Those heat-trapping gases are from the burning of fossil fuels
like coal, oil and gas.The La Nina pattern, which generally cools the ocean globally, happens every few years and was in play for much of 2011 and the early part of 2012. Yet both years were the hottest La Nina years on record and that shows the underlying global warming at work, said climate scientist Stefan Rahmstorf of the Max Planck Institute in Germany.
The last time the world had a cooler than average year was 1976, according to NOAA. That means more than half the people on Earth haven't lived during a cooler than normal year for the globe.
Three groups keep track of global
surface temperatures with records that go back more than a century:
NOAA, NASA and the British meteorology office. The British records for
2012 aren't finished yet, but are hovering around ninth warmest on
record, said monitoring chief David Parker.
NASA and NOAA calculations differ mostly in the polar areas, where there are far less measurements.A fourth group out of the University of Alabama at Huntsville looks at temperatures measured by satellites and only goes back to 1979, but is preferred by climate skeptics. That measurement ranked 2012 as the ninth warmest on record and notes that 11 of the 12 hottest years in their dataset have occurred since 2001.
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Online:
NOAA: http://www.ncdc.noaa.gov/sotc/global/2012/13
NASA: http://www.nasa.gov/topics/earth/features/2012-temps.html
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Seth Borenstein can be followed at http://twitter.com/borenbears
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