VALIDATION OF GOMOS, MIPAS AND SCIAMACHY OZONE AND TEMPERATUREMEASUREMENTS BY GROUNDBASED MEASUREMENTS AT UCCLE (BELGIUM)

摘要

The ozone and temperature measurements by the three atmospheric physics instruments GOMOS, MIPAS and SCIAMACHYrnaboard the ENVISAT satellite are being compared with the measurements performed with the Brewer 16 spectrophotometerrnand the ozone- and radiosoundings at the Royal Meteorological Institute of Belgium.rnRegarding the SCIAMACHY total ozone values, there is a negative bias of about -5% compared to our Brewer measurements.rnThere was no possibility to study the influence of clouds or solar zenith angle. The importance of the distance ofrnthe SCIAMACHY pixel from our stations is shown.rnThe GOMOS ozone profiles have been compared to our ozone soundings, but due to the poor quality of the GOMOSrnprofiles measured during daytime, the comparison is made in a qualitative way. For the temperature measurements, therernwas more co-located data available using radiosondes. The GOMOS low resolution temperature profiles compare veryrnwell with the radiosonde profiles. However, from the data it was not clear which values were actually retrieved and whichrnvalues were taken from a climatology.rnThe MIPAS temperature measurements have been analyzed as a function of distance, pressure level and time of measurement.rnThe general agreement with the radiosonde data is within 2%. There is an indication of a dependency on thernaltitude when using nighttime data which has to be confirmed when a larger dataset becomes available.