Linear approximation for the interpretation of the "adze" observations with a dobson spectrophotometer at Mexico City

Abstract

A linear analytical expression for the reduction of the "ADZB" type total ozone observations made at Mexico City is obtained. A comparative analysis among the charts developed in Canada, England, Sweden and the method proposed here is made. We find that the observations at Mexico City give erroneous results when they are interpreted using the Canadian and English charts. The reduction of the data using the method proposed here when the total ozone amount was between 240 and 320 DU and when the optical mass was between 1 and 2.5, give similar results to those obtained using the Swedish chart. For high ozone amounts (X> 320DU) the "ADZB" total ozone observations give uncertain results at Mexico City, this is probably caused by atmospheric pollution and, under these conditions, the use of this type of observation is not recommended.