Data assimilation inside Aladin:
Data assimilation inside Aladin 3 « operating Centers »: Budapest, Toulouse (operational), Casablanca (run daily)
Dispatched research collaborations: Bratislava (radar), Brussels (wavelet), Bucarest (ensembles, methods), Lisbon (ensembles), Ljubljana (nudging), Prague, Tunis (surface analysis), Sofia (surface analysis and snow), Zagreb (methods)
Existing tools:
Optimal Interpolation (« CANARI ») both for 3D and surface,
3D-VAR (screening and minimisation),
TL and adjoint Eulerian hydrostatic models
Hourly analyses for nowcasting purposes: Diagpack, later Varpack
4-year mid-term scientific plan: Aladin (with Arome input):
4-year mid-term scientific plan: Aladin (with Arome input) Variational assimilation:
« B » matrix; sampling of errors:
ensemble sampling, to replace NMC
Situation-dependent and hybridation
Jk statistics
Structure functions and dynamical balances:
Wavelets,
non-linear and Ω-equation,
PBL representation (joint action with Varpack ?)
Tuning, cycling and mapping of σb’s:
DFS method(s) to tune both Jo and Jb variances
gridpoint σb (2D or 3D maps) and cycling,
Formulation of the control variable:
humidity control variable: Holm for WV,
total liquid water content
Variational coupling « Jk »
4-year mid-term scientific plan: Aladin (with Arome input):
4-year mid-term scientific plan: Aladin (with Arome input) Variational assimilation:
Algorithms:
Maintenance of a reference assimilation cycle (LAMFLAG, all sorts of observations …)
Link 3D-VAR / Blending
3-hourly analyses cycle
3D-VAR FGAT,
SL TL/AD for HPE model
4D-VAR in a nutshell (HPE model increments)
Initialization and Jc:
Understand the relationships imbalances / DFI
Incremental DFI
Jc-DFI in 4D-VAR kernel
4-year mid-term scientific plan: Aladin (with Arome input):
4-year mid-term scientific plan: Aladin (with Arome input) Variational assimilation:
Observations:
satellite (cloudy IR, microwave, locally received data, impact of bias correction, wind retrievals),
GPS zenital delay,
radar reflectivity and Doppler winds,
2m and 10m mesonet
Surface analysis:
Ocean and sea ice SAF SST derived from geostationnary satellites
Snow analysis (with Hirlam), possibly using land SAF snow cover
Off-line soil analysis using « dynamical OI »
Diagnostic fine-grid 3D-VAR hourly analysis for nowcasting (Varpack)
Thank you for your attention:
Thank you for your attention