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Table of Contents
NYRAD35 35 GHz cloud rada
Principle
NYRAD35 is a dual-polarization simultaneous transmission and simultaneous reception (STSR; also referred to as hybrid-mode, or STAR, simultaneous transmission and reception) radar, with elevation-scanning capabilities. The scanner can perform full 180° scans in elevation and is operated at a constant azimuth of approximately 27°, i.e., along the north-north-east to south-south-west direction. STSR radars receive at horizontal and vertical polarization but transmit a signal that is linearly polarized along the 45° direction between vertical and horizontal directions. This allows both for linear depolarization ratio (LDR) observations in zenith and typical dual-polarization variable observations at low elevations, such as differential reflectivity (ZDR) or specific differential phase (KDP). Matching Ka- and W-band observations in zenith allows for the calculation of the DWR, in order to obtain information on the characteristics size of the ice particle population.
Data
- If you are interested in receiving data please contact: Kerstin Ebell
Deployment
| Period | Place | Project |
|---|---|---|
| 02/03/2023 - today | AWIPEV at Ny-Ålesund, Norway | (AC)3 |
| 14/06/2019 - 22/06/2022 | AWIPEV at Ny-Ålesund, Norway | (AC)3 |
| 23/03/2018 - 06/03/2019 | Iquique, Chile | CRC1211 |
| 10/06/2016 - 26/07/2017 | AWIPEV at Ny-Ålesund, Norway | (AC)3 |
| 16/10/2015 - 23/03/2016 | Research Center Jülich, Germany | JOYCE |
Specifications
| Parameter | Specification | Remark |
|---|---|---|
| Frequency | 94 GHz ± 100 MHz | corresponds to wavelength of 3.19 mm; adjustable by software between 92.3 and 95.7 GHz |
| IF Range | 350 kHz to 3 MHz | |
| Transmitter Power | ~ 2 W | solid state amplifier |
| Antenna gain | 50.8 dB | |
| Beam Width | 0.53° FWHM | |
| Polarisation | V | |
| System Noise Figure | 3 dB | |
| Dynamic Range | -54 dBZe to +20 DBZe at 1km height, -45 dBZe to +20 dBZe at 3 km height, -36 dBZe to +20 dBZe at 10 km height | |
| Ranging | 50 m to 18 km | |
| Calibration | Transmitter power monitoring, Receiver Dicke switch (for radar and DD channels), Hot/Cold absolute receiver calibration | Accuracy 0.4 dB |
| A/D Sampling Rate | 8.2 MHz | |
| Profile Sampling Rate | 0.2 s to 30 s | |
| Vertical Resolution | 1 m to 100 m | (user selectable) |
| Doppler Resolution | ± 1.5 cm/s | |
| Doppler Range | ± 18 m/s max. | |
| Chirp Variations | 4 typical | 10 possible, re-programmable |
| Passive Channels | 89 GHz | |
| Data Products | Reflectivity, Doppler-velocity, Spectral Width, Higher Moments, Doppler Spectra, LWC profiles | |
| Data Formats | proprietary binary, netCDF (conformity with CF convention), ASCII (only moment profiles) | |
| Rain / Snow Mitigation System | Super blower for rec. / transm. radome (2000 m³/h each) | Optional heater modules (2 kW to 4 kW) |
| Weight | Radar main body: 100 kg, Table: 130 kg, Air conductors: 25 kg | |
| Power Consumption | 220 V AC, 50-60 Hz, Radar: 400 W, Blowers: 1000 W | |
| Manufacturer | RPG |
References
Chellini, G., R. Gierens, K. Ebell, T. Kiszler, P. Krobot, A. Myagkov, V. Schemann, and S. Kneifel, 2023: Low-level mixed-phase clouds at the high Arctic site of Ny-Ålesund: A comprehensive long-term dataset of remote sensing observations, Earth Syst. Sci. Data, 15, 5427–5448, https://doi.org/10.5194/essd-15-5427-2023
Chellini, G., R. Gierens, and S. Kneifel, 2022: Ice aggregation in low-level mixed-phase clouds at a high Arctic site: Enhanced by dendritic growth and absent close to the melting level. Journal of Geophysical Research: Atmospheres, 127, e2022JD036860. https://doi.org/10.1029/2022JD036860