Unformatted text preview: The 8 shortest wavelengths are entirely absorbed by ozone before reaching the surface (within these 8, the shorter they are the smaller distance they penetrate into the atmosphere; i.e. optical depth is longer for the shorter UV wavelengths used in this composite). Consequently, these 8 shorter wavelengths are representative of a particular altitude (the altitude at which the wavelength is entirely extinguished). The remaining 4 are able to get through the atmosphere (optical depth of 0) without being extinguished by ozone. The image above uses all 12 so that the resulting data is less sensitive to tropospheric scattering and surface reflectivity (as opposed to only using the channels that make it all the way through). Clearly visible is the classic South Pole Ozone Hole. More info/Source: http://acdb-ext.gsfc.nasa.gov/Data_services/merged/sbuv.alg_cal.html...
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- Summer '08
- Ultraviolet, South Pole Ozone Hole, total column ozone