Micro Rain Radar Local Area Weather Radar Cloud

Micro- Rain- Radar Local Area Weather Radar Cloud Radar Gerhard Peters Meteorological Institute University Hamburg COPS-GOP-WS 3 Hohenheim 2006_04_10

MRR (Micro Rain Radar) characteristics Radar Wavelength =1. 25 cm Transmit Power 50 m. W Modulation FM-CW Beam width (2 way 6 d. B) 2° Antenna Offset parabola Number of range gates 31 Time Resolution 10 s Spectral Velocity Resolution 0. 191 m/s Nyquist Velocity Range 0 -12. 3 m/s Number of power spectra in 1 s 25 Min. detectable radar reflectivity (z=1000 m, dz=100 m, dt=60 s) -2 d. BZ COPS-GOP-WS 3 Hohenheim 2006_04_10

COPS-GOP-WS 3 Hohenheim 2006_04_10

COPS-GOP-WS 3 Hohenheim 2006_04_10

COPS-GOP-WS 3 Hohenheim 2006_04_10

COPS-GOP-WS 3 Hohenheim 2006_04_10

COPS-GOP-WS 3 Hohenheim 2006_04_10

COPS-GOP-WS 3 Hohenheim 2006_04_10

COPS-GOP-WS 3 Hohenheim 2006_04_10

Spectral Modes Top: Time-diameter cross section of slope of spectral rainrate The red lines indicate spectral maxima The red lines indicate height of melting layer Bottom: Time-height cross section of rain rate COPS-GOP-WS 3 Hohenheim 2006_04_10

Integral Modes 1 spectral maximum 2 spectral maxima COPS-GOP-WS 3 Hohenheim 2006_04_10

LAWR characteristics Based on Nautical Radar Furuno, Type FR 7112 Fan-beam-antenna replaced by pencil beam (Offset Parabol, 85 cm) Polarization: Horizontal Scan Rate: 24 rpm X-Band Transceiver: Fixed to Antenna Unit Transmit power: 12 k. W peak Frequency: 9410 ± 30 MHz (X-Band) Pulse width, Pulse repetition rate 0. 08 µs/2100 Hz 0. 3 µs/1200 Hz 0. 8 µs/600 Hz Sampling Rate 10 MHz (corresponds to 15 m range resolution) Digital power resolution 0. 005 d. B Dynamic range 70 d. B Beam width 2. 5 ° (3 d. B 1 way) Antenna Gain > 30 d. Bi Beam Elevation: +3° to + 20° (adjustable). Sensitivity: 0 d. BZ, (5 km range, 0. 08 µs pulse width, 30 s time integration, 60 m range integration, 2° azimuth integration) COPS-GOP-WS 3 Hohenheim 2006_04_10

LAWR characteristics COPS-GOP-WS 3 Hohenheim 2006_04_10

Proposed radar sites LAWR 14 MRR sites COPS-GOP-WS 3 Hohenheim 2006_04_10

What is a Cloud Radar? r ete μm iam d rop d in Ra r ete m ia pd dro μm weather radar cloud radar zz Dri le r ete μm iam d rop d s ud o l C d d rop COPS-GOP-WS 3 Hohenheim 2006_04_10 iam r ete μm

Cloud Radar MIRA 36 characteristics COPS-GOP-WS 3 Hohenheim 2006_04_10

Cloud Radar MIRA 36 measurement characteristics Minimum Height 200 m Measuring Range 15 km Range Resolution 15, 30, 45, and 60 m Doppler Velocity Resolution 0. 05 m/sec Maximum Unambiguous Velocity ± 15 m/sec Number of Gates (max) 500 FFT Length 128, 256, and 512 Minimum Dwell Time 0. 1 sec Antenna Beam Width 0. 6 deg. X 0. 6 deg. Number of Gates with Simultaneously Stored Raw Data (max) 8 Sensitivity at 5 km (the integration time of 0. 1 sec. ) -41 d. BZ COPS-GOP-WS 3 Hohenheim 2006_04_10

Cloud Radar MIRA 36 technical characteristics Frequency 36. 5 +/- 0. 5 GHz Peak Power (max) 30 k. W Tube Type magnetron Pulse Width 100 -400 ns Pulse Repetition Frequency 2. 5, 5, and 7. 5 k. Hz Minimum Detectable Signal -104 d. Bm Sampling Rate 50 MHz Sampling Resolution 12 bit Type of Bus for the Signal Processing Board PCI Operation System of the Host Computer Linux or Windows Network Protocol TCP/IP Antenna Diameter 1 m Sidelobe Level -20 d. B Power Supply 230 V+/-10% AC Power Consumption (max) 1. 3 k. W Weight 140 kg COPS-GOP-WS 3 Hohenheim 2006_04_10

Cloud radar Products Elmshorn 2006 -10 -01 Reflectivity Linear Depolarization Ratio Mean Doppler Velocity No Precipitation COPS-GOP-WS 3 Hohenheim 2006_04_10 Drizzle

Cloud radar Products Geesthacht 2000 -09 -06 12: 52 COPS-GOP-WS 3 Hohenheim 2006_04_10

Cloud radar Products Geesthacht 2000 -09 -04 21: 09 COPS-GOP-WS 3 Hohenheim 2006_04_10

Cloud radar site? COPS-GOP-WS 3 Hohenheim 2006_04_10