Within the ABC/J Geoverbund we are operating the twin research X-band polarimetric Doppler radars in Bonn (BoXPol) and Jülich (JuXPol, in approx. 50km distance). During the HOPE campaign within the HD(CP)2 initiative (http://www.hdcp2.eu) a third polarimetric X-band radar from the Karlsruhe Institute of Technology has been installed nearby in order to generate a local high-resolution 3D polarimetric composite and exploit the observational data base for model evaluation. Outside the HOPE campaign we make use of the great overlap with four C-band radars operated by the German Weather Service (DWD), also recently upgraded to polarimetry. Research on radar compositing and exploiting multi-sensor data sets has been initiated and performed by the OASE (Objectbased analysis and Seamless Prediction) research group headed by myself and funded from 2011-2014 by the Federal Ministry of Transport and Digital Infrastructure (BMVI) via DWD in the framework of the Hans-Ertel-Center for Weather Research (HErZ, see HErZ-OASE Observations and Products Composite File Format Specification, http://www.herz-tb1.uni-bonn.de/images/publications/herz-oasecomposite-format-v01a.pdf). Complemented with a great variety of in-situ and remote sensing instruments at the DFG-funded Core Facility Jülich Observatory for Cloud Evolution (JOYCE‐CF, see http://www.geomet.uni-koeln.de/joyce) our local overlapping radars represent an ideal radar research and development testbed.
Figure 1: Horizontal (upper plot) and 3D view of vertical cross-sections (lower plot) of radar reflectivity along the dashed black line based on the polarimetric X-Band radars in Bonn (BoXPol), Jülich (JuXPol) and the mobile radar from the Karlsruhe Institute of Technology (KiXPol). The hydrometeor classification based on Zrnić et al. (2000) adapted for X-Band wavelength from one scan is projected into the vertical cross-section, showing light rain in black, wet snow in dark grey, dry snow in grey, and dendrites/plates in white. The cloud top height as provided form Meteosat Second Generation is also shown in the bottom plot.
Simmer, C., G. Adrian, S. Jones, V. Wirth, M. Göber, C. Hohenegger, T. Janjic, J. Keller, C. Ohlwein, A. Seifert, S. Trömel, T. Ulbrich, K. Wapler, M. Weissmann, J. Keller, M. Masbou, S. Meilinger, N. Riss, A. Schomburg, C. Stein, A. Vormann (2014): HErZ - The German Hans-Ertel Centre for Weather Research. Submitted to the Bulletin of the American Meteorological Society.
Weissmann, M., M. Göber, C. Hohenegger, T. Janjic, J. Keller, C. Ohlwein, A. Seifert, S. Trömel, T. Ulbrich, K. Wapler, C. Bollmeyer, H. Deneke (2014): The Hans-Ertel Centre for Weather Research – Research objectives and highlights from its first three years. Meteorol. Z., 23(3), 193 – 208.