Yes, in most cases the forecast fields at time 0 are the same as the analysis fields. The exceptions are:
- Soil temperature lev2
- Soil temperature lev3
- Soil temperature lev4
- Sea-ice cover
- Skin temperature
- 2m temperature
- 2m dew-point temperature
Soil temperature lev2, 3 and 4 and skin temperature are identical over land; however, over sea there are differences due to the re-computation of the sea-ice mixed temperature, using the new SST and ice fraction provided by the analysis.
Sea-ice cover differs because a threshold is imposed for minimum sea-ice cover (>0.2) which resets the values along the edge of the sea-ice.
The difference between the 2m temperature and the 2m dewpoint temperature is due to the nature of these two fields: they are diagnostic fields, computed at each forecast step (including step =0) as an interpolated value between the lowest level and the surface, whereas the analysed values are the result of a separate computation of the 2m analysis.