Realtime assimilation efforts during COPS Realtime assimilation during

Real-time assimilation efforts during COPS • Real-time assimilation during COPS • Observations available in realtime 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 5 th COPS Workshop, Hohenheim, 26 -28 March 2007

Real-time assimilation during COPS Real-time assimilation of COPS data • Depending on the data provided during COPS, DWD will set up an extra assimilation with the COSMO model in an experimental mode. • IPM UHOH will set up an experimental real-time data assimilation using the MM 5 4 DVAR system. It will be set up for COPS. Therefore, the assimilation of additional data collected during COPS (mainly GPS slant-path and lidar data) is planned. Real-time assimilation during COPS • Real-time assimilation during COPS is done operationally in a region including the COPS domain by: • Meteo-France (ALADIN with 9. 5 km, and AROME with 2. 5 km) • Meteo-Swiss (COSMOCH 7 with 7 km, and COSMOCH 2 with 2 km) • DWD (COSMO with 2. 8 km) Here, additional data from COPS will only be included if the data type is already used operationally, and provided operationally to the forecasting center. 5 th COPS Workshop, Hohenheim, 26 -28 March 2007

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. Observing groups Prepare observations using one accepted data format (e. g. Net. CDF). Model & Data Store data used for real-time assimilation Fixed accepted location (e. g. hard disk in Hamburg) Weather service Put the data into the GTS system so that it is available for the assimilation. 5 th COPS Workshop, Hohenheim, 26 -28 March 2007

Example: GPS Network Coordination: Cedric Champollion, Galina Dick Stations so far used for the assimilation (UHOH) Filled circles: fixed or permanent GPS stations Open blue circles: additional French stations shall form a transect for tomography between supersites Open yellow circles: additional German stations of GFZ as of 4 th COPS Workshop located at COPS supersites International Ph. D-stud. and Post-doc meeting 2007 March 9 th, Bad Herrenalb

UHOH assimilation cycle during COPS Parallel forecast without additional data International Ph. D-stud. and Post-doc meeting 2007 March 9 th, Bad Herrenalb

Real-Time Assimilation System MM 5 set up • 18 km 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. International Ph. D-stud. and Post-doc meeting 2007 March 9 th, Bad Herrenalb

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 Gr. ADS, 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. 5 th COPS Workshop, Hohenheim, 26 -28 March 2007

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 operationally used data during COPS is an important task and a great opportunity. Action items for the workshop • Confirmation of interested groups (observations and assimilation) • Distribution of responsibilities • Data format, data handling, and data flow for real-time purposes • Operational schedule – Forecasting centers – Observations – Mission planning 5 th COPS Workshop, Hohenheim, 26 -28 March 2007

5 th COPS Workshop, Hohenheim, 26 -28 March 2007

ECMWF assimilation cycle International Ph. D-stud. and Post-doc meeting 2007 March 9 th, Bad Herrenalb