The Atmospheric Radiation Measurement (ARM) Climate User Facility (ACRF) operates nine Radar Wind Profilers (RWP) across its sites. These RWPs operate at a 915 MHz or 1290 MHz frequency and report the first three moments of the Doppler spectrum. The operational settings of the RWP were modified in summer 2015 to have a single pulse length setting for the wind mode and two pulse length settings for the precipitation mode. The moments data collected during the wind mode are used to retrieve horizontal winds. The vendor reported winds are available at variable time resolution (10 mins, 60 mins etc.) and contain significant amounts of contamination due to noise and clutter. In this data product, we have recalculated the moments and the winds from the raw radar Doppler spectrum and have made efforts to mitigate the contamination due to instrument noise in the wind estimates. Additionally, the moments and wind data has been reported in a harmonized layout identical for all locations and sites.
rwpwind > RWP Estimates from Wind Pulse ModeVAP Type(s) > Baseline • Evaluation
This dataset provides radar moments and horizontal winds from the radar wind profilers in a uniform format, and time resolution across all locations and sites. The current datastreams provide this data in different layouts and time resolutions for different sites and locations. The harmonized layout should make this data easier to work with.
|Developed By||Jonathan Helmus | Virendra Ghate|
|Data format||netcdf, png|
|Content time range||4 March 2019 - 30 October 2020|
|Attribute accuracy||Please refer to the technical report for the VAP for a discussion of the uncertainty of the reported horizontal winds. No formal accuracy tests were conducted for the reported moments.|
|Positional accuracy||No formal positional accuracy tests were conducted|
|Data Consistency and Completeness||In the moment datastreams, a sentinel missing value is used to indicate locations where moments could not be determined from the collected Doppler spectrum in the "noise", "snr", "spectral_width", and "mean_radial_velocity" variables. In the winds datastreams, a sentinel missing value is used to indicates times and heights where no velocity measurements within the consensus period met the SNR threshold described in the Technical Report for this VAP. Refer to this Technical Report for more details on the consistency and completeness of this data.|
|Access Restriction||No access constraints are associated with this data.|
|Use Restriction||No use constraints are associated with this data.|
|File naming convention||Follows ARM standards|
|Directory Organization||Files are in separate directories for each datastream. Each directory contains all files for that datastream. Quicklooks are in their own directory, again separated by datastream.|
Riley E, J Kleiss, L Riihimaki, C Long, L Berg, and E Kassianov. 2020. "Shallow cumuli cover and its uncertainties from ground-based lidar-radar data and sky images." Atmospheric Measurement Techniques, 13(4), 10.5194/amt-13-2099-2020.
Helmus J and VP Ghate. 2017. Improved Estimates of Moments and Winds from Radar Wind Profiler. Ed. by Robert Stafford, ARM Climate Research Facility. DOE/SC-ARM-TR-188.
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