Surface assimilation (presentation, March 2008)

Presentation of Rafiq Hamdi during the 2nd AROME training course, Lisbon, 4-7 March 2008: "Surface assimilation: status and plans" by Rafiq Hamdi with help from JF Mahfouf, F. Bouyssel and L. Auger and input from Adam Dziedzic and Karim Bergaoui.

• Introduction
  • The global data assimilation system
  • Surface analysis and upperair analysis
• Surface analysis by Optimum Interpolation using CANARI software
  • Surface Parameterization scheme (ISBA)
  • Soil moisture
  • Available observations for surface analysis
  • Optimum Interpolation and CANARI software
• Moving away from Optimum Interpolation using SURFEX software
  • Vertical interpolation scheme in SURFEX
  • The Extended Kalman Filter
  • The SEKF for Wp analysis within SURFEX
• Work to be done
  • A SEKF is now available within SURFEX for the analysis of soil moisture but needs analysis increments from a 2D spatial interpolation tool like CANARI OI.
  • The first results over ALADINFrance (done by JF Mahfouf) are encouraging.
  • Reduce remaining inconsistencies between SURFEX and ALADINISBA.
  • Couple the soil analysis with the atmospheric analysis to allow feedback.
  • Improve the efficiency of offline SURFEX version.
  • The vertical interpolation scheme in the surface boundary layer.
  • The use of SURFEX should help moving from a SEKF to an Ensemble Kalman Filter
  • Inclusion of a microwave emission model within SURFEX.
  • Inclusion of improved radiative and precipitation forcing.