Tropospheric Ozone Impacts Global Climate Warming

Released Tuesday, February 28, 2006

ID: 3338

- Visualizations by:
- Lori Perkins

In the first global assessment of the impact of ozone on climate warming, scientists at the NASA Goddard Institute for Space Studies (GISS), New York, evaluated how ozone in the lowest part of the atmosphere (the troposphere) changed temperatures over the past 100 years. Using the best available estimates of global emissions of gases that create ozone, the GISS computer model study reveals how much this single air pollutant and greenhouse gas has contributed to warming in specific regions of the world.

Ozone was responsible for one-third to half of the observed warming trend in the Arctic during winter and spring, according to the new research. Ozone is transported from the industrialized countries in the Northern Hemisphere to the Arctic quite efficiently during these seasons. The findings will be published soon in the American Geophysical Union's Journal of Geophysical Research-Atmospheres.

The impact of ozone air pollution on climate warming is difficult to pinpoint because, unlike other greenhouse gases such as carbon dioxide, ozone does not last long enough in the lower atmosphere to spread uniformly around the globe. Its warming impact is much more closely tied to the region it originated from. To capture this complex picture, the GISS scientists used a suite of three-dimensional computer models that starts with data on ozone sources and then tracks how ozone chemically evolved and moved around the world over the past century.

The research was supported by NASA's Atmospheric Chemistry Modeling and Analysis Program.

This animation shows anomalous global temperature averages from December through May in the years 1880 through 2000.

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Temperature Colorbar

1880 - This image shows a decadal winter and spring seasonal average between December through May in the years 1880 through 1889.

1890 - This image shows a decadal winter and spring seasonal average between 1890 and 1899. Both polar regions are slightly above normal temperatures.

1900 - This image shows a decadal winter and spring seasonal average between 1900 and 1909. Notice both polar regions are at or below average temperatures.

1910 - This image shows a decadal winter and spring seasonal average between 1910 and 1919. Notice both polar regions are at or below average temperatures.

1920 - This decadal winter and spring seasonal average shows higher than normal temperatures in Europe, but the poles are both normal.

1930 - This decadal winter and spring seasonal average shows both polar regions are at or below average temperatures.

1940 - This decadal winter and spring seasonal average shows warmer then normal temperatures over Europe, but both polar areas record normal temperatures.