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Joshua Turner - The 8 shortest wavelengths are entirely...

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Total Column Ozone derived from GOES Sounders: South Pole View http://www.osdpd.noaa.gov/data/ozone/n16_to_sh.gif This is a plot of the total column ozone of the South Pole. The image is created using multiple channels in order to see different levels of the atmosphere; the resulting image is a sum of those products. Specifically, it is a passive sensor, measuring backscattering ultraviolet radiation, looking at a nadir (straight down) angle as it flies overhead. This angle is important in calculating the extinction of the beam, but taken straight down simplifies the equation substantially. As the UV radiation penetrates the atmosphere, it is absorbed by the Ozone in the atmosphere, and so, as more UV radiation is absorbed by ozone, lower amounts of backscattered UV radiation are detected by the satellite. There are a total of 12 wavelengths in the UV spectrum used in the making of this image; 12 different wavelengths are used in order to penetrate deeper into the column to get a grasp of what the total column ozone amount is.
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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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