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CAESAR: HVPS-3 Data and Imagery

Summary

The HVPS-3 instrument, or High Volume Precipitation Spectrometer, is an open path optical array probe. Unlike the 2D-S, the HVPS has a single channel, which images cloud particles between about 150 microns - 19 mm in size, with 150 micron resolution, as they pass through the instrument sample volume. This imagery is used to calculate the concentration and cross-sectional area size distributions, and to estimate the mass size distribution of the observed cloud and precipitation particles. These variables are integrated across the size bins to obtain the total concentration, extinction, and estimated total water content over the observed size range, and is provided at a frequency of 1 Hz. The particle imagery can be utilized to infer cloud particle phase. This data does not cover the full size range of cloud particles, and should be analyzed in conjunction with complementary cloud probes, such as the CDP, 2D-S or 2DC, etc. This dataset contains HVPS-3 data and imagery collected aboard the NCAR C-130 during the CAESAR project.

Archive note

No data are available from RF03 (2 March) and RF08 (25 March).

Data access

ORDER data to made available for download

Additional information

Identifier	DOI: https://doi.org/10.26023/N2NM-4PQQ-7H0C
Data Quality	final
Versions	0.1 (2024-05-13) 1.0 (2025-04-17): Final processed data. (Only the current version of the data is available to order. If you have questions about a prior version, please email us.)
Subscribe	Subscribe to receive email when new or updated data is available.
Related projects	CAESAR: Cold Air Outbreak Experiment in the Sub-Arctic Region
Spatial Type	point
Frequency	1 second
Language	English
Categories	Aircraft
Platforms	NSF NCAR C-130
Instruments	HVPS-3 - High Volume Precipitation Spectrometer 3
GCMD Science Keywords	CLOUD DROPLET CONCENTRATION/SIZE CLOUD DROPLET DISTRIBUTION CLOUD LIQUID WATER/ICE HYDROMETEORS PARTICLE SIZE DISTRIBUTION Expand keywords
Documentation	README_CAESAR_OAPs.pdf [40 KiB]
Related links	info: CAESAR Data Policy homepage: CAESAR EOL Homepage info: CAESAR Missions

Temporal coverage

Begin datetime	2024-02-28 11:40:00
End datetime	2024-04-03 16:00:00

Spatial coverage

Map data from IBCSO, IBCAO, and Global Topography.

Maximum (North) Latitude: 82.00, Minimum (South) Latitude: 66.00
Minimum (West) Longitude: -14.00, Maximum (East) Longitude: 24.00

Primary point of contact information

EOL Data Support <datahelp@eol.ucar.edu>

Additional contact information

author: Sarah Woods <sfwoods@ucar.edu>

Citation

Woods, S. 2025. CAESAR: HVPS-3 Data and Imagery. Version 1.0. UCAR/NCAR - Earth Observing Laboratory. https://doi.org/10.26023/N2NM-4PQQ-7H0C. Accessed 26 Apr 2025.

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