The Erythemal Index is a measure of ultraviolet (UV) radiation at ground level on the Earth. (The word 'erythema' means an abnormal redness of the skin, such as is caused by spending too much time in the sun—a sunburn is damage to your skin cells caused by UV radiation.) Atmospheric ozone shields life at the surface from most of the harmful components of solar radiation. Chemical processes in the atmosphere can affect the level of protection provided by the ozone in the upper atmosphere. This thinning of the atmospheric ozone in the stratosphere leads to elevated levels of UV at ground level and increases the risks of DNA damage in living organisms.
This animation shows monthly average erythemal index for 2000-01 through 2001-12. The image size is 288x180 pixels (288x176 pixels for the MPEG movie); each pixel corresponds to an area 1 degree in longitude by 1.25 degrees in latitude.
Please give credit for this item to: NASA/Goddard Space Flight Center
Scientific Visualization Studio
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Data Used: Earth Probe/TOMS/Erythemal
2000-01-01 through 2001-12-31
Note: While we identify the data sets used in these visualizations, we do not store any further details nor the data sets themselves on our site.
GCMD keywords can be found on the Internet with the following citation:
Olsen, L.M., G. Major, K. Shein, J. Scialdone, S. Ritz, T. Stevens, M. Morahan, A. Aleman, R. Vogel, S. Leicester, H. Weir, M. Meaux, S. Grebas, C.Solomon, M. Holland, T. Northcutt, R. A. Restrepo, R. Bilodeau, 2013. NASA/Global Change Master Directory (GCMD) Earth Science Keywords. Version 22.214.171.124.0