The SAGE II/OSIRIS/OMPS-LP USask 2D Deseasonalized Anomaly Ozone Data Record for Use in Trend Analysis

The SAGE II/OSIRIS/OMPS-LP USask 2D ozone deseasonalized anomaly data record spans over three decades, from 1984 to the present, and has been used extensively for the determination of stratospheric ozone trends in the post Montreal Protocol era. Radiance measurements made by the three instruments have all been used to produce ozone data profiles whose native units are number density as a function of altitude. Therefore, during the merging process required to produce the extended data record it is not necessary to use meteorological data for unit conversion and all trends contained within the data record come directly from the data products themselves. Although the SAGE II occultation data record ended in 2005, both the OMPS-LP and OSIRIS limb scattered sunlight data records continue. OSIRIS has been in operation since 2001 and is well beyond its lifetime but OMPS-LP is scheduled for launch on future spacecraft so the data record should continue for many years, or even decades. It is also anticipated that SAGE III ISS data will be added to the existing record to further enhance its utility for trend analysis. This paper will outline the process used to produce the deseasonalized ozone anomaly data record detailing the issues associated with merging data records that have different biases and sampling characteristics. Issues associated with SAGE II and OSIRIS measurements that are made at different local times will also be discussed. Finally, this paper will present trend results produced using variations of the official LOTUS analysis code. These results cover an altitude range from the tropopause to 55 km and from 60 South to 60 North in ten-degree bins. It will be shown that the new OMPS-LP USask 2D data record is of excellent quality and can be used to extend the ozone data records for the purpose of trend analysis.