AIR FORCE CAMBRIDGE RESEARCH LABS HANSCOM AFB MA
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The vertical distribution of atmospheric ozone as determined by the infrared method is limited in vertical resolution and is very sensitive to observational errors. A set of linearized error equations was derived from the three basic equations of the infrared method, and the sensitivity of the determined ozone distribution to errors in the observational input data total ozone, infrared absorption and infrared emission was computed for a few cases. It was shown that in the region above the tropopause, the ozone distribution is most sensitive to measurements of infrared absorption. The numerical results indicate that a positive error of, e. g. one percent in the observation of infrared absorption could erroneously increase the ozone amount in the layer tropopause to 50 mb by 15 percent and erroneously decrease the amount of ozone in the layer 50-30 mb by about 10 percent. In the infrared method the Curtis Godson approximation is used in an inverted way in order to obtain the mean pressure of the ozone distribution. An estimate of the accuracy of the inverted use of the approximation was made by making use of a simple spectral model, and the effect of this theoretical error on the determined ozone distribution was also included in the above error analysis. The mean pressure was found to be underestimated by about 20 percent in the case of atmospheric ozone, and the resulting ozone distribution would be severely distorted by this error alone.
- Atmospheric Physics