Gerber scientific (GSI) 1000-hz PVM https://data.eol.ucar.edu/dataset/87.129 Summary This data set includes airborne measurements obtained from the NSF/NCAR C-130 aircraft during the "Rain in Cumulus Over the Ocean" (RICO) project. This data set contains 1000 hertz PVM data. The files are in netCDF format. Two hot-wire liquid water sensors and a PVM-100 laser-based liquid water sensor were mounted on the C-130 for the program. While all systems performed well, accumulation of salt on the hot-wire elements tended to increase the baseline drift in the raw output. RAF employed a loose-couple processing method to remove the excess drift. Both techniques, hot wire and PVM-100, have a tendency to underestimate the total liquid water in large drops or mixed phase clouds. The effective radius Re of the cloud droplets (XGRFF) is given by Re(um) = 30,000 x XGLWC(g/m^3)/XGSFC(cm^2/m^3). As the values of XGLWC and XGSFC approach zero the noise in the calculated values for Re will approach infinity given Re is the ratio of the two quantities. Thus to get all meaningful values of Re, a conditional statement should be applied to the ratio to avoid excessive noise. The recommended approach is to chose a limiting value of XGLWC below which no value of Re is calculated. With additional care in removing any remaining small offsets in the XGLWC and XGSFC data, the limiting value of XGLWC can be chosen as small as 0.010 g/m^3 for this data set. XGRFF was calculated with an XGLWC threshold of 0.05 and the additional condition that XGSFC>0 to avoid negative radius value. Identifiers * Local archive identifier: 87.129 * doi:10.26023/YMF2-9Z9V-PT06 https://doi.org/10.26023/YMF2-9Z9V-PT06 Versions 1.0 Citation UCAR/NCAR - Earth Observing Laboratory. 2024. RICO: Gerber scientific (GSI) 1000-hz PVM. Version 1.0. UCAR/NCAR - Earth Observing Laboratory. https://doi.org/10.26023/YMF2-9Z9V-PT06 Accessed 08 May 2024. Additional citation styles can be generated by entering the DOI at CrossCite (https://citation.crosscite.org/). Acknowledgement In addition to the citation reference and any other acknowledgements, please acknowledge NCAR/EOL in your publications with text such as: Data provided by NCAR/EOL under the sponsorship of the National Science Foundation. https://data.eol.ucar.edu/ Related projects * RICO: Rain in Cumulus Over the Ocean https://data.eol.ucar.edu/project/RICO Additional information * Spatial Type: point * Frequency: < 1 second * Language: English Categories * Aircraft Platforms * NSF/NCAR C-130 Instruments * Cloud Liquid Water Probe GCMD Science Keywords * EARTH SCIENCE > ATMOSPHERE > AEROSOLS > AEROSOL PARTICLE PROPERTIES * EARTH SCIENCE > ATMOSPHERE > CLOUDS > CLOUD MICROPHYSICS > CLOUD DROPLET CONCENTRATION/SIZE * EARTH SCIENCE > ATMOSPHERE > CLOUDS > CLOUD MICROPHYSICS > CLOUD LIQUID WATER/ICE Related links * info: Utilities for working with RAF aircraft NetCDF files https://github.com/ncar/aircraft_nc_utils * homepage: RICO Homepage https://www.eol.ucar.edu/field_projects/rico * info: RICO Missions http://catalog.eol.ucar.edu/rico/catalog/missions.html * info: RICO Data Policy https://www.eol.ucar.edu/content/rico-data-policy * info: NCAR RAF netCDF Conventions https://archive.eol.ucar.edu/raf/Software/netCDF.html Temporal coverage * Begin datetime: 2004-11-24 00:00:00 * End datetime: 2005-01-24 23:59:00 Spatial coverage * Maximum (North) Latitude: 21.00 * Minimum (South) Latitude: 15.00 * Minimum (West) Longitude: -72.00 * Maximum (East) Longitude: -57.00 Primary contact information * pointOfContact: EOL Data Support https://data.eol.ucar.edu/contact/show/1 Additional contact information * publisher: EOL Data Support https://data.eol.ucar.edu/contact/show/1 * author: EOL Data Support https://data.eol.ucar.edu/contact/show/1 Alternate metadata formats * DataCite: https://data.eol.ucar.edu/dataset/87.129?format=datacite * ISO/TC 211: https://data.eol.ucar.edu/dataset/87.129?format=isotc211