ALGOM addresses the following studies, which are shortly summarized:
Improvement of the algorithm for O3 and aerosol retrievals in the UTLS
A validation of IPF v6.01 against soundings at different NDACC stations was performed. GOMOS v6.01 ozone data values in the upper troposphere–lower stratosphere (UTLS) are largely overestimated and therefore very large bias is shown. Within ALGOM framework, optimization of GOMOS O3 retrievals in the UTLS using two-step and one-step retrieval approach has been performed.
Design a new algorithm for minor species using averaged transmissions
In this study, a method for the retrieval of minor species defined as "Virtualization method" is developed.
The principle of virtualization is to combine several single measurements spatially and temporally collocated in a time–latitude bin to obtain a "virtual" measurement, which is representative of this bin. For each bin, a statistical analysis is performed to guarantee that all the GOMOS single measurements used to build the data set are well representative of the same atmospheric conditions. The SNR of the virtual measurement is then sufficient to retrieve the minor species, such as Na and OClO.
Improve the user-friendliness of GOMOS Level 2 data by creating quality screening algorithms and forming user-friendly data sets
The aim of this study is the development of a method for data screening and flagging of GOMOS Level 2 data, processed with the latest processor IPF v6.01, resulting in a "user friendly" Level 2 dataset in netCDF4 format.