January 24, 2006

2005 was warmest year on record: NASA

By Deborah Zabarenko

WASHINGTON (Reuters) - Last year was the warmest recorded
on Earth's surface, and it was unusually hot in the Arctic,
U.S. space agency NASA said on Tuesday.

All five of the hottest years since modern record-keeping
began in the 1890s occurred within the last decade, according
to analysis by NASA's Goddard Institute for Space Studies.

In descending order, the years with the highest global
average annual temperatures were 2005, 1998, 2002, 2003 and
2004, NASA said in a statement.

"It's fair to say that it probably is the warmest since we
have modern meteorological records," said Drew Shindell of the
NASA institute in New York City.

"Using indirect measurements that go back farther, I think
it's even fair to say that it's the warmest in the last several
thousand years."

Some researchers had expected 1998 would be the hottest
year on record, notably because a strong El Nino -- a
warm-water pattern in the eastern Pacific -- boosted global

But Shindell said last year was slightly warmer than 1998,
even without any extraordinary weather pattern. Temperatures in
the Arctic were unusually warm in 2005, NASA said.

"That very anomalously warm year (1998) has become the
norm," Shindell said in a telephone interview.

"The rate of warming has been so rapid that this
temperature that we only got when we had a real strong El Nino
now has become something that we've gotten without any unusual
worldwide weather disturbance."

Over the past 30 years, Earth has warmed by 1.08 degrees F
(0.6 degrees C), NASA said. Over the past 100 years, it has
warmed by 1.44 degrees F (0.8 degrees C).

Shindell, in line with the view held by most scientists,
attributed the rise to emissions of greenhouse gases such as
carbon dioxide, methane and ozone, with the burning of fossil
fuels being the primary source.

The 21st century could see global temperature increases of
6 to 10 degrees F (3 to 5 degrees C), Shindell said.

"That will really bring us up to the warmest temperatures
the world has experienced probably in the last million years,"
he said.

To understand whether the Earth is cooling or warming,
scientists use data from weather stations on land, satellite
measurements of sea surface temperature since 1982, and data
from ships for earlier years.

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