GPM Ground Validation Autonomous Parsivel Unit (APU) IPHEx
Table of Contents
Introduction
The GPM Ground Validation NASA Autonomous Parsivel Unit (APU) IPHEx dataset was acquired by multiple parsivel instruments during the GPM Integrated Precipitation and Hydrology field campaign which took place in western North Carolina from April through June 2014. This dataset also contains measurements from APUs deployed in late October and November of 2013. The APU, an optical disdrometer based on single particle extinction, measures particle size and fall velocity. ASCII encoded data files containing information on the drop size distribution and integral precipitation parameters such as precipitation rate, reflectivity, and mass-weighted mean diameter.
Citation
The following example shows how to cite the use of this dataset in a publication. For more information, please see our Citing GHRC DAAC and Data page.
Petersen, W., A., Tokay, P. Gatlin, and M. Wingo. 2015. GPM Ground Validation Autonomous Parsivel Unit (APU) IPHEx [indicate subset used]. Dataset available online [https://gpm.nsstc.nasa.gov/gpm_validation/iphex/disdrometers_and_gauges/parsivel/data/] from the NASA EOSDIS Global Hydrology Resource Center Distributed Active Archive Center, Huntsville, Alabama, U.S.A.
doi: http://dx.doi.org/
Campaign
The overarching objective of integrated hydrologic ground validation activities supporting the Global Precipitation Measurement (GPM) mission was to provide better understanding of the strengths and limitations of the satellite products, in the context of hydrologic applications. To this end, the GPM Ground Validation (GV) program conducted one of several hydrology-oriented field efforts: the Integrated Precipitation and Hydrology Experiment. IPHEx sought to characterize warm season orographic precipitation regimes, and the relationship between precipitation regimes and hydrologic processes in regions of complex terrain. The GPM Integrated Precipitation and Hydrology Experiment occurred in North Carolina, from April through June 2014.
Additional information can be found here http://pmm.nasa.gov/iphex. Information on the Global Precipitation Measurement (GPM) mission is available at http://pmm.nasa.gov/GPM.
Instrument Description
The Autonomous Parsivel Unit (APU) is an optical disdrometer based on single particle extinction that measures particle size and fall velocity. This APU consists of the Parsivel, which was developed by OTT in Germany, and its support systems, which were designed and built by the University of Alabama in Huntsville.
This dataset contains observations during the Integrated Precipitation and Hydrology Experiment (IPHEx), which took place in western North Carolina during the months of October and November of 2013. There are currently 11 APUs deployed in western North Carolina.
The complete list of measurements and associated instruments is available in the header block of the QC processed data files. More information on Citation flight days can be found in the IPHEx Citation Mission Summary document.
InvestigatorsWalter A. Petersen
NASA Wallops Flight Facility
Wallops Island, VA 23375
Matthew Wingo
Patrick Gatlin
File Naming Convention
QC processed files and browse files are of the form:
iphex_apugpmpaiphex_[date]_[latitude_longitude].tar
where,
where
[sn] = serial number of APU platform (e.g., apu01)
[date] = YYYYmmDD (e.g., 20110422)
[latitude_longitude]=geographic location of instrument
(e.g., N363442.07_W0972640.90 is North 36°34'42.07" and West
97°26'40.90")
Data Format
More information on the Parsivel data files can be found here https://ghrc.nsstc.nasa.gov/pub/doc/gpmgv/parsivel/DataFormat_parsivel_iphex.pdf.
References
Beard, K. V., 1976: Terminal velocity and shape of cloud and precipitation drops aloft. J. Atmos. Sci., 33, 851–864.
Gunn, R. and G. D. Kinzer. 1949. The terminal velocity of fall for water drops in stagnant air. J. Meteor., 6, 243–248.
Jaffrain, Joël, Alexis Berne, 2011: Experimental quantification of the sampling uncertainty associated with measurements from PARSIVEL Disdrometers. J. Hydrometeor, 12, 352–370.
Tokay, A., A. Kruger, and W. Krajewski, 2001: Comparison of drop size distribution measurements by impact and optical disdrometers. J. Appl. Meteor., 40, 2083–2097.
Contact Information
To order these data or for further information, please contact:
Global Hydrology Resource Center
User Services
320 Sparkman Drive
Huntsville, AL 35805
Phone: 256-961-7932
E-mail: ghrcdaac@itsc.uah.edu
Web: http://ghrc.nsstc.nasa.gov/
|
