1. Institut für Physik der Atmosphäre POLDIRAD Polarization Diversity Doppler Radar Martin Hagen DLR Oberpfaffenhofen

2. Institut für Physik der Atmosphäre 2 Martin Hagen, 3rd COPS Workshop 10-11 April 2006 linear circular elliptical Possible Polarizations Polarization Diversity Doppler Radar POLDIRAD Products Reflectivity Doppler Velocity Spectral Width Depolarization Ratio LDR Differential Reflectivity ZDR Differential Propagation Phase KDP Rain Graupel Hail Technical Characteristics Frequency5.5035 GHz Wavelength5,45 cm Transmit Power250 kW Pulse Rep. Freq.400 - 2400 Hz Pulse Width0.5, 1.0, 2.0 µs Beam width1.0 ° Max. Range300 km

3. Institut für Physik der Atmosphäre 3 Martin Hagen, 3rd COPS Workshop 10-11 April 2006 POLDIRAD’s features Doppler velocity measurements: – convective structures in boundary layer, – multiple Doppler wind retrieval with other Doppler radar. Polarimetric parameter measurements: – estimation of the rain drop size distribution (RDSD), – hydrometeor classification.

4. Institut für Physik der Atmosphäre 4 Martin Hagen, 3rd COPS Workshop 10-11 April 2006 POLDIRAD during COPS All operation radars are Dopplerized. Only one polarimetric Doppler radar available in the COPS region (Montancy). No Doppler radar in the Rhine valley. No radar coverage in the boundary layer. POLDIRAD in the Strasbourg region. Additional radars like NCAR’s S-POL and DOW’s (Doppler on wheels) are needed.

5. Institut für Physik der Atmosphäre 5 Martin Hagen, 3rd COPS Workshop 10-11 April 2006 POLDIRAD and MRR transect Observation of the modification of the RDSD by orography. MRR_1 MRR_2 MRR_3 MRR_4