Other groups that study climate change also rank these years as among the warmest, though the exact rankings vary depending upon details of the analyses. Results differ especially in regions of sparse measurements, where scientists use alternative methods of estimating temperature change.
Goddard Institute researchers used temperature data from weather stations on land, satellite measurements of sea surface temperature since 1982 and data from ships for earlier years.
“2007 is likely to be warmer than 2006,” said James Hansen, director of NASA GISS, “and it may turn out to be the warmest year in the period of instrumental measurements. Increased warmth is likely this year because an El Nino is underway in the tropical Pacific Ocean and because of continuing increases in human-made greenhouse gases.”
Most places on the globe have warmed in recent decades, with the greatest warming at high latitudes in the Arctic Ocean, Alaska, Siberia and the Antarctic Peninsula. Most ocean areas have warmed. Climatologists say that warming is not due to local effects of heat pollution in urban areas, a point demonstrated by warming in remote areas far from major cities.
In their analysis for the 2005 calendar year, GISS climatologists noted the highest global annual average surface temperature in more than a century.
Leslie McCarthy | EurekAlert!
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