...

Two reanalyses that meet this recommendation have been completed, for the period 20070101 to 20151231. The first reanalysis assimilates just reprocessed GPS-RO data provided the ROM SAF and AMSUA channel 14 to constrain the upper stratosphere. The second reanalysis also includes conventional measurements (e.g., sondes, synop, ...) that are not bias corrected as part of the variational bias correction (VAR-BC) scheme. Notably, this excludes aircraft temperature measurements that are bias corrected in VAR BC. 

The two reanalyses provide:

• gridded analysis files at for the hours (00,03,06,09,12,15,18,21) for each day

...

• monthly mean fields
• the observation departure statistics for the data assimilated

...

• in the reanalyses  

Access via web-api

The ROM SAF datasets are available from the ECMWF public datasets service via the web-api. This is a "programmatic approach" for data download with python scripts.  The basic web-api documentation for accessing the data is given here., but we will note some key steps required to download the data and provide the main links.

...