POLDIRAD Measurements Martin Hagen and Hartmut Höller Jens Reimann, Lothar Oswald, Hermann Scheffold, DLR Oberpfaffenhofen
Polarization Doppler Radar POLDIRAD 1986 installed as the first fully polarimetric weather radar in Europe. Operations normally for research, not for operational service www.pa.op.dlr.de/poldirad Samples of campaigns: Support of hail fighting in the area Rosenheim / Miesbach / Bad Tölz Thunderstorm and hail Propagation of micro waves Aircraft icing Vertical transport of pollutants by thunderstorms Thunderstorm and lightning Wake turbulence Aviation and winter weather... Technical Characteristics Frequency Wave Length Peak Power 5.5035 GHz 5.45 cm 250 kw Pulse Rep. Freq. 400-2400 Hz Pulse Length 0.5, 1.0, 2.0 µs Beam Width 1.0 Maximum Range 300 km Products Reflectivity Doppler Velocity Differ. Reflectivity Depolarisat. Ratio Differential Phase 2
Polarization Doppler Radar POLDIRAD What makes POLDIRAD special: dual-polarization radar with the capability of hydrometeor classification flexible scanning modus flexible product generation estimation of wind field 3
Polarization Doppler Radar POLDIRAD current DWD radar Fürholzen DLR Oberpfaffenhofen DWD Hohenpeißenberg new DWD radar Schnauping (2013?) 50 km 4
POLDIRAD Measurements Measurement schedule, cycle 10 minutes Surveillance 300 km range (low elevation) Volume scan 120 km range (1 20 elevation) Vertical cross-section scan (RHI) towards Munich Airport Automatic radar product generation SELEX Rainbow5 Gamic Toolkit www.pa.op.dlr.de/poldirad/online.html www.pa.op.dlr.de/poldirad/rainbow.html 5
POLDIRAD Measurements 16 June 2011 Rapid development of squall line Preceding gust front Gust front reaches airport at 18:42 UTC Thunderstorm at airport 19:05 UTC 6
POLDIRAD Measurements 16 June 2011 Rapid development of squall line Preceding gust front Gust front reaches airport at 18:42 UTC Thunderstorm at airport 19:05 UTC 7
POLDIRAD Measurements 16 June 2011 Reflectivity in dbz 18:01 UTC Doppler velocity in m/s 8
POLDIRAD Measurements 16 June 2011 18:01 UTC Reflectivity in dbz HWIND wind vectors 9
POLDIRAD Measurements 16 June 2011 18:43 UTC Reflectivity in dbz HWIND wind vectors 10
POLDIRAD Measurements 16 June 2011 Wind profile at radar location 16:31 to 19:02 UTC 11
POLDIRAD Measurements 16 June 2011 Echo Top (some dependence on scan strategy) 12
POLDIRAD Measurements 16 June 2011 Vertical structure RHI 18:49 UTC Towards Munich Airport MUC at 50 km range from Oberpfaffenhofen 13
POLDIRAD Measurements 16 June 2011 Vertical structure Crosssection along approach / departure ±50 km (±27NM) 50 km 263 MUC 50 km 83 14
Classification of Hydrometeors Based on thresholds (Höller et al., 1994) 15
POLDIRAD Most products are available in near real-time www.pa.op.dlr.de/poldirad/ rainbow.html 16
Conclusions POLDIRAD measurements during the summer campaign 2011 POLDIRAD needs manned operation (extended working hours) Benefit through optimized scanning strategy dedicated vertical cross-sections dedicated volume scans On-going improvement of current products and development of new radar products RadTRAM with POLDIRAD Hydrometeor classification Lightning overlay POLDIRAD products are provided in near real-time in the web (free of charge) 17
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