http://www.giss.nasa.gov/research/news/20140121/
NASA Finds 2013 Sustained Long-Term Climate Warming Trend
Posted Jan. 21, 2014
NASA scientists say 2013 tied with 2009 and 2006 for the seventh warmest year since 1880, continuing a long-term trend of rising global temperatures.
Maps of 2013 global temperature anomaly and trend
Maps of the 2013 global temperature anomaly (top) and the 1950-2013 temperature trend (bottom.) (Image Credit: NASA/GSFC/Earth Observatory, NASA/GISS)
+ View larger image
With the exception of 1998, the 10 warmest years in the 134-year record all have occurred since 2000, with 2010 and 2005 ranking as the warmest years on record.
NASA's Goddard Institute for Space Studies (GISS) in New York, which analyzes global surface temperatures on an ongoing basis, released an updated report Tuesday on temperatures around the globe in 2013. The comparison shows how Earth continues to experience temperatures warmer than those measured several decades ago.
The average temperature in 2013 was 58.3 degrees Fahrenheit (14.6 degrees Celsius), which is 1.1 °F (0.6 °C) warmer than the mid-20th century baseline. The average global temperature has risen about 1.4 °F (0.8 °C) since 1880, according to the new analysis. Exact rankings for individual years are sensitive to data inputs and analysis methods.
"Long-term trends in surface temperatures are unusual and 2013 adds to the evidence for ongoing climate change," GISS climatologist Gavin Schmidt said. "While one year or one season can be affected by random weather events, this analysis shows the necessity for continued, long-term monitoring."
Scientists emphasize that weather patterns always will cause fluctuations in average temperatures from year to year, but the continued increases in greenhouse gas levels in Earth's atmosphere are driving a long-term rise in global temperatures. Each successive year will not necessarily be warmer than the year before, but with the current level of greenhouse gas emissions, scientists expect each successive decade to be warmer than the previous.
Carbon dioxide is a greenhouse gas that traps heat and plays a major role in controlling changes to Earth's climate. It occurs naturally and also is emitted by the burning of fossil fuels for energy. Driven by increasing man-made emissions, the level of carbon dioxide in Earth's atmosphere presently is higher than at any time in the last 800,000 years.
Bar chart of temperature anomalies, 1950-2013
Chart of the temperature anomalies for 1950-2013, also showing the phase of the El Niño-La Niña cycle. (Image Credit: NASA/GSFC/Earth Observatory, NASA/GISS)
+ View larger image
The carbon dioxide level in the atmosphere was about 285 parts per million in 1880, the first year in the GISS temperature record. By 1960, the atmospheric carbon dioxide concentration, measured at the National Oceanic and Atmospheric Administration's (NOAA) Mauna Loa Observatory in Hawaii, was about 315 parts per million. This measurement peaked last year at more than 400 parts per million.
While the world experienced relatively warm temperatures in 2013, the continental United States experienced the 42nd warmest year on record, according to GISS analysis. For some other countries, such as Australia, 2013 was the hottest year on record.
This visualization shows how global temperatures have risen from 1950 through the end of 2013. This and related visualizations are available from the NASA GSFC Scientific Visualization Studio. (Image Credit: NASA/GSFC/SVS, NASA/GISS)
+ Download this video
The temperature analysis produced at GISS is compiled from weather data from more than 1,000 meteorological stations around the world, satellite observations of sea-surface temperature, and Antarctic research station measurements, taking into account station history and urban heat island effects. Software is used to calculate the difference between surface temperature in a given month and the average temperature for the same place from 1951 to 1980. This three-decade period functions as a baseline for the analysis. It has been 38 years since the recording of a year of cooler than average temperatures.
The GISS temperature record is one of several global temperature analyses, along with those produced by the Met Office Hadley Centre in the United Kingdom and NOAA's National Climatic Data Center in Asheville, N.C. These three primary records use slightly different methods, but overall, their trends show close agreement.
Related links:
NASA Earth Observatory has posted a somewhat different temperature summation at:
http://earthobservatory.nasa.gov/IOTD/view.php?id=82918
Additional commentary on the 2013 temperature anomaly is provided by Dr. James Hansen of Columbia University at:
www.columbia.edu/~jeh1/mailings/2014/20140121_Temperature2013.pdf
The GISTEMP analysis website is located at:
http://data.giss.nasa.gov/gistemp/
NASA Finds 2013 Sustained Long-Term Climate Warming Trend
Posted Jan. 21, 2014
NASA scientists say 2013 tied with 2009 and 2006 for the seventh warmest year since 1880, continuing a long-term trend of rising global temperatures.
Maps of 2013 global temperature anomaly and trend
Maps of the 2013 global temperature anomaly (top) and the 1950-2013 temperature trend (bottom.) (Image Credit: NASA/GSFC/Earth Observatory, NASA/GISS)
+ View larger image
With the exception of 1998, the 10 warmest years in the 134-year record all have occurred since 2000, with 2010 and 2005 ranking as the warmest years on record.
NASA's Goddard Institute for Space Studies (GISS) in New York, which analyzes global surface temperatures on an ongoing basis, released an updated report Tuesday on temperatures around the globe in 2013. The comparison shows how Earth continues to experience temperatures warmer than those measured several decades ago.
The average temperature in 2013 was 58.3 degrees Fahrenheit (14.6 degrees Celsius), which is 1.1 °F (0.6 °C) warmer than the mid-20th century baseline. The average global temperature has risen about 1.4 °F (0.8 °C) since 1880, according to the new analysis. Exact rankings for individual years are sensitive to data inputs and analysis methods.
"Long-term trends in surface temperatures are unusual and 2013 adds to the evidence for ongoing climate change," GISS climatologist Gavin Schmidt said. "While one year or one season can be affected by random weather events, this analysis shows the necessity for continued, long-term monitoring."
Scientists emphasize that weather patterns always will cause fluctuations in average temperatures from year to year, but the continued increases in greenhouse gas levels in Earth's atmosphere are driving a long-term rise in global temperatures. Each successive year will not necessarily be warmer than the year before, but with the current level of greenhouse gas emissions, scientists expect each successive decade to be warmer than the previous.
Carbon dioxide is a greenhouse gas that traps heat and plays a major role in controlling changes to Earth's climate. It occurs naturally and also is emitted by the burning of fossil fuels for energy. Driven by increasing man-made emissions, the level of carbon dioxide in Earth's atmosphere presently is higher than at any time in the last 800,000 years.
Bar chart of temperature anomalies, 1950-2013
Chart of the temperature anomalies for 1950-2013, also showing the phase of the El Niño-La Niña cycle. (Image Credit: NASA/GSFC/Earth Observatory, NASA/GISS)
+ View larger image
The carbon dioxide level in the atmosphere was about 285 parts per million in 1880, the first year in the GISS temperature record. By 1960, the atmospheric carbon dioxide concentration, measured at the National Oceanic and Atmospheric Administration's (NOAA) Mauna Loa Observatory in Hawaii, was about 315 parts per million. This measurement peaked last year at more than 400 parts per million.
While the world experienced relatively warm temperatures in 2013, the continental United States experienced the 42nd warmest year on record, according to GISS analysis. For some other countries, such as Australia, 2013 was the hottest year on record.
This visualization shows how global temperatures have risen from 1950 through the end of 2013. This and related visualizations are available from the NASA GSFC Scientific Visualization Studio. (Image Credit: NASA/GSFC/SVS, NASA/GISS)
+ Download this video
The temperature analysis produced at GISS is compiled from weather data from more than 1,000 meteorological stations around the world, satellite observations of sea-surface temperature, and Antarctic research station measurements, taking into account station history and urban heat island effects. Software is used to calculate the difference between surface temperature in a given month and the average temperature for the same place from 1951 to 1980. This three-decade period functions as a baseline for the analysis. It has been 38 years since the recording of a year of cooler than average temperatures.
The GISS temperature record is one of several global temperature analyses, along with those produced by the Met Office Hadley Centre in the United Kingdom and NOAA's National Climatic Data Center in Asheville, N.C. These three primary records use slightly different methods, but overall, their trends show close agreement.
Related links:
NASA Earth Observatory has posted a somewhat different temperature summation at:
http://earthobservatory.nasa.gov/IOTD/view.php?id=82918
Additional commentary on the 2013 temperature anomaly is provided by Dr. James Hansen of Columbia University at:
www.columbia.edu/~jeh1/mailings/2014/20140121_Temperature2013.pdf
The GISTEMP analysis website is located at:
http://data.giss.nasa.gov/gistemp/
