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Abstract:
We introduce the new GOME-2 daily and monthly level 3 product of total column ozone (O3), total and tropospheric column
nitrogen dioxide (NO2), total column water vapour, total column bromine oxide (BrO), total column formaldehyde (HCHO)
and total column sulphur dioxide (SO2). The GOME-2 level 3 products are aimed to provide easily translatable and user-
friendly data sets to the scientific community for scientific progress as well as satisfying public interest. The purpose of this5
paper is to present the theoretical basis as well as the verification and validation of the GOME-2 daily and monthly level 3 products.
The GOME-2 level 3 products are produced using the overlapping area weighting method. Details of the gridding algorithm
are presented. The spatial resolution of the GOME-2 level 3 products is selected based on sensitivity study. The consistency
of the resulting level 3 products among three GOME-2 sensors is investigated through time series of global averages, zonal
averages, and bias. The accuracy of the products is validated by comparing to ground-based observations. The verification and validation results show that the GOME-2 level 3 products are consistent with the level 2 data. Small discrepancies are found5
among three GOME-2 sensors, which are mainly caused by the differences in instrument characteristic and level 2 processor. The comparison of GOME-2 level 3 products to ground-based observations in general shows very good agreement, indicating
the products are consistent and fulfil the requirements to serve the scientific community and general public.
