Improvement of precipitation forecast with GPS
- Integrated Water Vapor derived from reprocessed GPS data set for 20th of June 2007. The total number of stations is increased from ~220 to more than 350.
- © GFZ
research projects COPS-GRID ("High-resolution Reanalyses and
Impact Studies for Improving Process Understanding and Precipitation
Forecast Skill based on the COPS Data Set") followed by
APRO-GRAVAR ("Assimilation and Process Studies for selected COPS
IOPs using GPS STD and radar radial velocities in the WRF-Var
system") were funded within the DFG priority programme
"Quantitative precipitation forecast, SPP 1167).
Within these projects the impact of GPS-derived Integrated Water Vapor (IWV) and Slant Total Delay (STD) data to improve precipitation forecasts has been investigated.
For this study GPS data from about 450 stations in Germany and France as well as from 5 GFZ stations at the Black Forrest were collected withing the framework of the international field campaign COPS (“Convective and Orographically Induced Precipitation Study”) performed in southwestern Germany/eastern France in Summer 2007. All these data were processed by GFZ and the analysis results (IWV and STDs data) were provided for the assimilation studies.
Both projects were conducted together with University Hohenheim and German Weather Service.
 Zus, F., Wickert J., Bauer H. S., Schwitalla T., Wulfmeyer V.: Experiments of GPS slant path data assimilation with an advanced MM5 4DVAR system, Meteorologische Zeitschrift, 20, 2, 173-184, 2011.
 Behrendt, A.; Pal, S.; Aoshima, F.; Bender, M.; Blyth, A.; Corsmeier, U.; Cuesta, J.; Dick, G.; and C. Flamant, M. D.; Girolamo, P. D.; Gorgas, T.; Huang, Y.; Kalthoff, N.; Khodayar, S.; Mannstein, H.; Traeumner, K.; Wieser, A. Wulfmeyer, V. Observation of convection initiation processes with a suite of state-of-the-art research instruments during COPS IOP 8b Q. J. R. Meteorol. Soc., 2011, 137, 81-100 DOI:10.1002/qj.758 .
 Van Baelen J., M. Reverdy, F. Tridon, L.Labbouz, G. Dick, M. Bender, and M.Hagen On the relationship between water vapour field evolution and Precipitation systems lifecycle Q. J. R. Meteorol. Soc., 2011, 137, 204-223 DOI:10.1002/qj.785 .
 Wulfmeyer, V.; Behrendt, A.; Kottmeier, C.; Corsmeier, U.; Barthlott, C.; Craig, G. C.; Hagen, M.; Althausen, D.; Aoshima, F.; Arpagaus, M.; Bauer, H.-S.; Bennett, L.; Blyth, A.; Brandau, C.; Champollion, C.; Crewell, S.; Dick, G.; Di Girolamo, P.; Dorninger, M.; Dufournet, Y.; Eigenmann, R.; Engelmann, R.; Flamant, C.; Foken, T.; Gorgas, T.; Grzeschik, M.; Handwerker, J.; Hauck, C.; Höller, H.; Junkermann, W.; Kalthoff, N.; Kiemle, C.; Klink, S.; König, M.; Krauss, L.; Long, C. N.; Madonna, F.; Mobbs, S.; Neininger, B.; Pal, S.; Peters, G.; Pigeon, G.; Richard, E.; Rotach, M. W.; Russchenberg, H.; Schwitalla, T.; Smith, V.; Steinacker, R.; Trentmann, J.; Turner, D. D.; van Baelen, J.; Vogt, S.; Volkert, H.; Weckwerth, T.; Wernli, H.; Wieser, A.; Wirth, M. (2011): The Convective and Orographically-induced Precipitation Study (COPS): the scientific strategy, the field phase, and research highlights. Quarterly Journal of the Royal Meteorological Society, 137, S1, 3-30. DOI:10.1002/qj.752 .