Deterministic models assimilating RO
- Global only spectral model t359l50:
- ~37km horizontal resolution
- 50 vertical model levels, top at 0.01hPa
- Four forecasts delivered per day at: 00, 06, 12, 18UTC
Data assimilation method
- 4D-Var with a 6-hour assimilation window
- Cutoff times:
| Synoptic time | 00Z | 06Z | 12Z | 18Z |
| Real | 6h35 | 6h25 | 6h35 | 6h25 |
| Post | 11h10 | 11h20 | 11h10 | 11h20 |
RO quantity assimilated
- Bending angle
- 1D operator
- Tangent point drift
- No vertical thinning
- No bias correction
Observation error characteristics
- Below 10km impact height: ob*20%
- Above 10km impact height: max(ob*1.5%, 6microradians)
Impact
Total moist error norm (J/kg) from surface to ~150hPa show a consistent positive impact, though the GNSS sensors do trail the microwave and IR satelite sounders in impact for this metric. Of the GNSS sensors the COSMIC give the largest impact mostly due to their use below 8km.
The near real-time monitoring for NRL is here (external link).