xsacr: X-Band Scanning ARM Cloud Radar

ARM’s scanning cloud radars are fully coherent dual-frequency, dual-polarization Doppler radars mounted on a common scanning pedestal. Each pedestal includes a Ka-band radar (2kW peak power) and the deployment location determines whether the second radar is a W-band (WSACR; 1.7 kW peak power) or X-band (XSACR; 20 kW peak power). At ARM’s tropical sites, X-band radars are paired with the Ka-band because they are better suited for the atmospheric attenuation in this region.

Beamwidth for the X-band is approximately 1 degree, and the Ka-band beamwidth is roughly 0.3 degrees. Due to the narrow antenna beamwidth, ARM’s scanning cloud radars use scanning strategies unlike typical weather radars. Rather than focusing on plan position indicator, or PPI, scans, the X-SACR uses range height indicator, or RHI, scans at numerous azimuths to obtain cloud volume data.

For the second ARM Mobile Facility (AMF2), the X-SACR can be dismounted from the pedestal it shares with the Ka-SACR and mounted on a separate pedestal. This allows the X-SACR to operate more like a weather (precipitation) radar in deployments where such local coverage is lacking.

Measurements collected with the X-SACR are copolar and cross-polar radar reflectivity, Doppler velocity, spectra width and spectra when not scanning, differential Reflectivity (Zdr), correlation coefficient (rho-hv), and specific differential phase (phi-dp).

Measurements

Locations

  • Fixed
  • AMF1
  • AMF2
  • AMF3

Related Publications

2018

Mechem D and S Giangrande. 2018. "The Challenge of Identifying Controls on Cloud Properties and Precipitation Onset for Cumulus Congestus Sampled During MC3E." Journal of Geophysical Research: Atmospheres, 123(6), doi:10.1002/2017JD027457.
Research Highlight

Falconi M, A von Lerber, D Ori, F Marzano, and D Moisseev. 2018. "Snowfall retrieval at X, Ka and W band: consistency of backscattering and microphysical properties using BAECC ground-based measurements." Atmospheric Measurement Techniques, 11(5), 10.5194/amt-11-3059-2018.

2017

Korolev A, G McFarquhar, P Field, C Franklin, P Lawson, Z Wang, E Williams, S Abel, D Axisa, S Borrmann, J Crosier, J Fugal, M Kramer, U Lohmann, O Schlenczek, and M Wendisch. 2017. "Ice Formation and Evolution in Clouds and Precipitation: Measurement and Modeling Challenges. Chapter 5: Mixed-phase clouds: progress and challenges." Meteorological Monographs, 58, 10.1175/AMSMONOGRAPHS-D-17-0001.1.

Verlinde J, MJ Bartholomew, J Cherry, and M Ritsche. 2017. North Slope of Alaska Snow Intensive Operational Period Field Campaign Report. Ed. by Robert Stafford, ARM Climate Research Facility. DOE/SC-ARM-17-018.

2016

Helmus JJ and SM Collis. 2016. "The Python ARM Radar Toolkit (Py-ART), a Library for Working with Weather Radar Data in the Python Programming Language." Journal of Open Research Software, 4(1), 10.5334/jors.119.
Research Highlight

Oue M, M Galletti, J Verlinde, A Ryzhkov, and Y Lu. 2016. "Use of X-Band Differential Reflectivity Measurements to Study Shallow Arctic Mixed-Phase Clouds." Journal of Applied Meteorology and Climatology, 55(2), 10.1175/jamc-d-15-0168.1.

2015

Roeder L. 2015. ARM West Antarctic Radiation Experiment (AWARE) Backgrounder. Ed. by Dana DuPont, ARM Climate Research Facility. DOE/SC-ARM-15-045.

Oue M, MR Kumjian, Y Lu, Z Jiang, EE Clothiaux, J Verlinde, and K Aydin. 2015. "X-Band Polarimetric and Ka-Band Doppler Spectral Radar Observations of a Graupel-Producing Arctic Mixed-Phase Cloud." Journal of Applied Meteorology and Climatology, 54(6), 10.1175/jamc-d-14-0315.1.

Kneifel S, A von Lerber, J Tiira, D Moisseev, P Kollias, and J Leinonen. 2015. "Observed relations between snowfall microphysics and triple-frequency radar measurements." Journal of Geophysical Research: Atmospheres, 120(12), 10.1002/2015jd023156.
Research Highlight

Jundt R. 2015. ARM Mobile Facility Fact Sheet. DOE/SC-ARM-15-022.


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