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Merged Semi-Monthly Mean dataset (MSMM)

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The Merged Semi-Monthly Mean (MMZM) dataset is created using measurements from limb sensors participating in Ozone_cci project, for years 2007-2008 (Phase 1).
First, the ozone profiles from individual instruments are averaged in 10° x 20° latitude-longitude zones over half-month time intervals, and then merged.
The merging is performed in the same way as for creating Merged Monthly Zonal Mean data, i.e., as weighted averaging of individual semi-monthly-mean ozone profiles with the weights inversely proportional to their total uncertainties.  The details of the data analysis can be found in the “Data description and user manual” below. The MSMM netcdf files include also semi-monthly mean datasets from individual instruments.
Ozone profiles are presented on Ozone_cci pressure grid in the range 250hPa – 1 hPa (~10-50 km).

DOWNLOAD the Merged Semi-Monthly Mean (MSMM) data sets

Update 21 November 2013:

  • The dataset is updated using corrected SCIAMACHY data

For more details:

Contact: Viktoria Sofieva (viktoria.sofieva ( at )