BoM/MO JEDI OPS meeting, 9 Dec, 2020

Present: Chiara Piccolo, Stefano Migliorini, David Simonin, Douglas Boyd, Peter Steinle, Fiona Smith, Andy Smith, Jin Lee, Susan Rennie

Timeline of NG-OPS and NG-DA - David

• Aiming to deliver NG-OPS by March 2023
  • to be used in 3DVar UM-JEDI and 3DVar LFRic-JEDI
  • assumption is that LFRic and NG-DA will be implemented together
  • plan to use ODB
• The NG-OPS and NG-DA projects are driven by supercomputer changes
  • avoid porting UM
  • Plan A: 4DVar using LFRic-JEDI and hybrid
  • Plan B: 4DEnVar and possibly EnKF for LAM

Possible areas of contribution

• Best if partners take on workpackages which are not in the critical path
  • work undertaken can be considered in stretch packages
• 3 possible work areas,
  1. Currently C++ JOPA calls Fortran. Helpful if all Fortran can be replaced with C++
  2. FSOI capability
     • UKMO is not planning to implement FSOI
     • depending on whether the global DA uses 4DVar or 4DEnVar the implementation of FSOI would be radically different: adjoint-based in the case of former and ensemble-based in the case of the latter
  3. Currently the 1DVar used in radiance processing is only an interface to Fortran. Useful if Fortran is replaced with C++. This is not entirely a coding exercise,
     • UKMO would like to use OOPS 1DVar
     • implement different minimisation method: e.g. Levenberg-Marquardt
     • Instead of processing column by column there might be a way to process all at once
     • TL and Adj need to written in C++
     • desirable to merge radiance and GPSRO 1DVar processing
• Already Jorge Bornemann (NIWA) has taken on a piece of work
  • will start in Jan, 2021
  • working on
    • IAU
    • LFRic-JEDI interface to Fortran (?)

Information sharing

• Chiara to ask Keir if NG-OPS and NG-DA project board meeting can be shared
• Adam Maycock in charge of TIDA (?)
• To improve communication with partners about NGMS we need to talk to Keir
• Meet again in Feb/Mar before Partnership Board meeting
  • BOM may be in a position to give available resources