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CAESAR: Fast 2D-S Data and Imagery

Summary

A 2D-S instrument is a cloud particle probe that contains two orthogonal open path optical array probes, which image cloud particles between about 10 microns - 2 mm in size 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 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, HVPS, etc. This dataset contains Fast 2D-S data and imagery collected aboard the NCAR C-130 during the CAESAR project.

Archive note

Data are not available for 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/NFNP-51FQ-VX00
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	2DS - 2D-Stereo Particle Probe Fast-2DS
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]

Temporal coverage

Begin datetime	2024-02-28 11:40:21
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: Fast 2D-S Data and Imagery. Version 1.0. null. https://doi.org/10.26023/NFNP-51FQ-VX00. Accessed 15 Jul 2025.

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