PATTERN: Advantages of High Resolution Weather Radar Networks
TCS Building 240
Precipitation observations with radars operating in the X-band frequency range are essential for meeting present and future requirements for flood forecasting, water management, and other hydro-meteorological applications. Besides having higher resolution, these systems are cost-effective compared to S- or C-band radars because of smaller antenna size. Disadvantages of single X-band radars are the large influence of attenuation by liquid water and a relatively short range.
The project Precipitation and ATTenuation Estimates from a High-Resolution Weather Radar Network (PATTERN) is designed to demonstrate that a network of high-resolution weather radars (HRWRs) can overcome the apparent drawbacks of single X-band radars. The University of Hamburg and the Max Planck Institute for Meteorology have set up a network of four modified ship navigation radars near Hamburg, Germany. The network has been operational since January 2012. Each radar has a maximum range of 20 km with 60 m spatial and 30 s temporal resolution. A large area in the network is covered by at least two radars at the borders and up to four radars in the center. Several rain stations consisting of a micro-rain radar (MRR) and a rain gauge complement the network. These stations are used to calibrate and evaluate the quality of the X-band radars.
In addition to identifying advantages and disadvantages of the HRWR network and single X-band radar, Dr. Lengfeld will briefly describe the algorithms used to derive precipitation from reflectivity measurements — particularly algorithms exploiting benefits of the network, such as clutter removal and replacement of disturbed pixels with measurements from other radars rather than interpolation. A comparison with measurements of the German Weather Service weather radar operating in C-band will focus on the ability of high-resolution observations to generate information about-small scale structures of rain events. Dr. Lengfeld will also describe the specifications of the modified HRWR systems and the design of the network.