2010 finishes in a statistical tie as the warmest year in the past 32
Global climate trend since Nov. 16, 1978: +0.14 C per decade
December temperatures (preliminary)
Global composite temp.: +0.18 C (about 0.32 degrees Fahrenheit) above 30-year average for December.
Northern Hemisphere: +0.21 C (about 0.38 degrees Fahrenheit) above 30-year average for December.
Southern Hemisphere: +0.15 C (about 0.26 degrees Fahrenheit) above 30-year average for December.
Tropics: -0.22 C (about 0.40 degrees Fahrenheit) below 30-year average for December.
November temperatures (revised):
Global Composite: +0.27 C above 30-year average
Northern Hemisphere: +0.37 C above 30-year average
Southern Hemisphere: +0.17 C above 30-year average
Tropics: -0.12 C below 30-year average
(All temperature anomalies are based on a 30-year average (1981-2010) for the month reported.)
Notes on data released Jan. 5, 2011:
The year 2010 finished in a photo finish with 1998 for the warmest year in the 32-year satellite temperature record, according to Dr. John Christy, professor of atmospheric science and director of the Earth System Science Center at he University of Alabama in Huntsville. 2010 was only 0.013 C cooler than 1998, an amount that is not statistically significant.
Both 1998 and 2010 were years in which an El Nino Pacific Ocean warming event raised temperatures around the globe. In recent months a La Nina Pacific Ocean cooling event has been building; temperatures in the tropics were cooler than seasonal norms for both November and December.Annual Global Average Anomaly
The continental, contiguous U.S. has warmed by about 0.67 C (about 1.21 degrees Fahrenheit) since 1979.Climate trends since November 1979
"This will not affect the long term trend, which is the most important of the numbers we produce, but will 'reshuffle' anomalies to reflect the new base period," said Christy.* * *
The satellite-based instruments measure the temperature of the atmosphere from the surface up to an altitude of about eight kilometers above sea level. Once the monthly temperature data is collected and processed, it is placed in a "public" computer file for immediate access by atmospheric scientists in the U.S. and abroad.Neither Christy nor Spencer receives any research support or funding from oil, coal or industrial companies or organizations, or from any private or special interest groups. All of their climate research funding comes from
federal and state grants or contracts.Dr. John Christy, (256) 961-7763
Dr. John Christy | Newswise Science News
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