Observations : use, screening, cost function, control and monitoring (presentation, 2001)

Presentation of Patrick Moll and Elisabeth Gérard during the ALATNET training course on Data Assimilation in Gourdon, 11-22 June 2001.

• Observation : General presentation
  • General problematic of data assimilation
  • Problems with the available data
  • Real time available data
  • Production suite
  • The process of data assimilation
  • Operational suite at Meteo-France
• Summary of the current use of observations at Météo-France
  • Conventional observations
    • Synops : Details of use
    • Surface : Data coverage
    • Buoys and Aireps : Details of use
    • Aircraft : Data coverage
    • Temp : Details of use
    • Sonde : Data coverage
    • Pilot, Satob, ERS : Details of use
    • Satwind : Data coverage
  • Satellite observations
    • TOVS120, ATOVS, ATOVS120, SSMI
  • Number of obs in Arpege
  • Problem with observations
• Screening of observations
  • Sceening Problematic
  • Preliminary check of observations
    • Background quality control
    • Vertical consistency, duplication problem
    • Redundancy check
  • Thinning of observations
    • Thinning of Airep, Satob, TOVS, Satellite Radiances
    • Impact of the screening
• The observations in the variational cost function
  • General Position
  • Variational formulation
  • Observation operators
  • Interpolations
  • Adjoints of the observations operators
• Control and monitoring of the observations
  • General principle of data minitoring
  • Sources ofmodel and observations errors
  • Instrumental errors
  • Blacklisting observations
  • WMO standard thresholds
  • Control of the assimilations
• Exercice : the observations in the variational cost function