Realtime assimilation during COPS

1
Real-time assimilation efforts during COPS

• Real-time assimilation during COPS
• Observations available in real-time during COPS
• Example GPS
• Status of the preparations in Hohenheim
• Conclusions and action items for the work shop

Hans-Stefan Bauer, Matthias Grzeschik, Florian
Zus, Volker Wulfmeyer, and Andreas
Behrendt Institute of Physics and Meteorology
(IPM) University of Hohenheim, Stuttgart, Germany
2
Real-time assimilation during COPS
3
Observations available in real time
Here, many open questions exist, which have to be
discussed at the workshop.

• What data is available for real-time
  assimilation?
• GPS, wind lidar, additional sounding, and
  surface data
• ground-based and airborne lidar data,
• It is important that responsibilities are shared
  between the groups.
• It is necessary that the data format and the
  operational schedules are fixed as soon as
  possible.

4
Example GPS Network
Coordination Cedric Champollion, Galina Dick
5
UHOH assimilation cycle during COPS
Parallel forecast without additional data
6
Real-Time Assimilation System

• MM5 set up
• 18km horizontal resolution for the assimilation
• 36 vertical layers
• 6-h assimilation window
• Free forecasts in 3 two-way interacting nests
  with 18, 6, and 2 km horizontal resolutions.

7
Status plot generation

• The plots from the participating models necessary
  for mission planning will be generated by one
  system to ensure cross-model comparability.
• The system is based on the visualization tool
  GrADS, and its development is coordinated in
  Hohenheim (Matthias Grzeschik).
• Starting from TIGGE conform model output,
  several standard plots necessary for the
  forecaster are generated automatically.

8
Conclusions

• COPS provides a unique data set for real-time
  data assimilation.
• Assimilation of data from sophisticated water
  vapor observing systems like DIAL, Raman
  lidar, and GPS proved to impact the forecasts.
  However, single case studies do not allow
  general conclusions about the potential of these
  observing systems.
• Therefore, real-time assimilation of data
  provided additionally to already oper-
  ationally used data during COPS is an important
  task and a great opportunity.

9
(No Transcript)
10
ECMWF assimilation cycle