IMPACT OF GPS DATA ASSIMILATION ON THE CONVECTIVE SCALE PREDICTION OF COPS IOP9

摘要

The impact of assimilating GPS delays in a convective scale NWP system has-been studied for I0P9 (18-20 July 2007) of the COPS field campaign over the Black Forest and the Vosges region. The high-resolution temporary GPS receivers network deployed during the COPS campaign provides us a unique opportunity to evaluate the benefit of assimilating such high-spatial GPS data in addition to those from the operational European E-GVAP network. A clear positive impact on the AROME precipitation forecast has been found when the GPS delays are assimilated. The impact is more important on IOP9b (19 July). The comparison with other water vapour measurements performed during the COPS field campaign, such as those from additional soundings and water vapour LIDAR, shows that the tropospheric water vapour field is also improved.