GPM Ground Validation Dual Polarization Radiometer GCPEx
Table of Contents
The GPM Ground Validation Dual Polarization Radiometer GCPEx data set was collected using a dual polarized radiometer (DPR) at the Centre for Atmospheric Research Experiments in Ontario, Canada for the GPM Cold-season Precipitation Experiment (GCPEx) during the period from November 23, 2011 to March 1, 2012. The data set contains brightness temperature observations at 90 GHz (non polarized) and 150 GHz (HV-polarized) and is available in .nc netCDF format.
The following example shows how to cite the use of this data set in a publication. For more information, please see our Citing GHRC DAAC and Data page.
The GPM Cold-season Precipitation Experiment (GCPEx) occurred in Ontario, Canada during the winter season of 2011-2012. GCPEx addressed shortcomings in the GPM snowfall retrieval algorithm by collecting microphysical properties, associated remote sensing observations, and coordinated model simulations of precipitating snow. These data sets were collected to aid in the achievement of the over arching goal of GCPEx which is to characterize the ability of multi-frequency active and passive microwave sensors to detect and estimate falling snow.
During GCPEx, the Dual Polarization Radiometer was located at the CARE site in Ontario, Canada. The coordinates of the CARE site are: Lat: 44°13'59.45"N, Lon: 79°46'50.11"W.
Data was collected from November 23, 2011 through March 1, 2012. Further details on GCPEx are available at http://gpm.nsstc.nasa.gov/gcpex. Information on the Global Precipitation Measurement (GPM) mission is available at http://pmm.nasa.gov/GPM.
The RPG-DP-90-150 Dual Polarization Radiometer (DPR), manufactured by Radiometer Physics GmbH, measures brightness temperatures at the frequencies of 90 and 150 GHz. The DPR is sensitive to particle orientation since it observes the brightness temperature difference between the vertical and horizontal polarization channels at 150 GHz, which is important for the retrieval of particle shape and orientation with polarization observations. Due to high-frequency window channels, the DPR also has a high sensitivity to the supercooled liquid water in clouds. Ancillary data is captured for the internal calibration of the instrument.
More detailed information on the RPG-DP-90-150 Dual Polarization Radiometer is available in the reference manual at
The GPM Ground Validation Dual Polarization Radiometer GCPEx data set consists of .nc netCDF files. The files are named with the following convention:
These files contain daily brightness temperature measurements at 90 GHz (not polarized) and 150 GHz (HV-polarized).Data Format
The GPM Ground Validation Dual Polarization Radiometer GCPEx data set is in netCDF format.
Xie, X., U. Löhnert, S. Kneifel, and S. Crewell, 2012: Snow particle orientation observed by ground-based microwave radiometry. Journal of Geophysical Research: Atmospheres, 117, D02206, 12 pp., doi: 10.1029/2011JD016369.
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