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GPM Ground Validation Environment Canada (EC) Precipitation Occurrence Sensor System (POSS) GCPExTable of Contents
The GPM Ground Validation Environment Canada (EC) Precipitation Occurrence Sensor System (POSS) GCPEx data set was gathered during the GPM Cold-season Precipitation Experiment which took place in Ontario, Canada, January 15- March 1, 2012. The POSS is a bi-static, X-band Doppler radar designed by Environment Canada. The POSS measures a signal whose frequency is proportional to the particle Doppler velocity and whose amplitude is proportional to the particle scattering cross-section. POSS measurements are used to provide information regarding precipitation occurrence, type, rate, and raindrop size distribution. CampaignThe 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, a POSS was located at four of the ground sites in Ontario, Canada. The POSS unit numbers and the corresponding site names and locations are:
Data was collected from January 15, 2012 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. Instrument DescriptionThe Precipitation Occurrence Sensor System (POSS) is a bi-static, continuous wave, horizontally polarized, X-band Doppler radar originally developed by the Meteorological Service of Canada for reporting the occurrence, type and intensity of precipitation from automated weather observing stations. The radar is mounted on a post about 3 meters above the surface and measures the Doppler velocity spectrum of hydrometeors traversing a small volume within a distance of about 3 meters of the sensor. POSS measurements are used to provide information regarding precipitation occurrence, type, rate, and raindrop size distribution. InvestigatorsDavid Hudak The EC POSS files are named with the following convention:
where,
The EC POSS browse files are named with the following convention:
where, Data Format The GPM Ground Validation EC POSS data set consists of daily comma-separated value (CSV) ASCII text files. More information on the format of the data can be found in the Description of the POSS post processed "PR" file document. CitationOur data sets are provided through the NASA Earth Science Data and Information System (ESDIS) Project and the Global Hydrology Resource Center (GHRC) Distributed Active Archive Center (DAAC). GHRC DAAC is one of NASA's Earth Observing System Data and Information System (EOSDIS) data centers that are part of the ESDIS project. ESDIS data are not copyrighted; however, in the event that you publish our data or results derived by using our data, we request that you include an acknowledgment within the text of the article and a citation on your reference list. Examples for general acknowledgments, data set citation in a reference listing, and crediting online web images and information can be found at: http://ghrc.nsstc.nasa.gov/uso/citation.html Sheppard B.E. and P.I. Joe, 2007. Performance of the Precipitation Occurrence Sensor System as Precipitation Gauge. J. Atmos. Oceanic Technol. ,25, 196-212. To order these data or for further information, please contact:
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