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"Encourage NWP centers to engage in reanalysis activities based only on data types that are not bias-corrected, especially RO. ECMWF, e.g., carries out such an activity as part of the ROM SAF CDOP-2 plans."
Two The two atmopsheric reanalyses cover the the period 20070101 to 20151231. They have been run using the ERA5 reanalysis system, but at low resolution (T159 ~ 125 km), and using a static B matrix rather than ERA5's flow-dependent version which uses the Ensemble of Data Assimilations approach. The first ROM SAF 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 atmospheric reanalyses provide:
- gridded daily analysis fields at the hours (00,03,06,09,12,15,18,21) (class=ea, stream=oper, type=an)
- monthly mean fields from 20070201 to 20151201 (class=ea, stream=moda, type=an)
- the observation departure statistics for the data assimilated in the reanalyses (class=ea, stream=oper, type=mfb)
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