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VOCALS: Giant Cloud Condensation Nuclei (CCN) Impactor Raw Data


The NCAR/EOL/RAF Giant Cloud Condensation Nuclei Impactor (GNI) samples giant aerosol particles. 

Slides were exposed in the free air stream onto uncoated polycarbonate microscope slides. After exposure in the free air stream, the slides were analyzed in the NCAR/EOL/RAF GNI slide chamber, using a dual-optical microscope. Each slide was inserted into the humidified chamber with a relative humidity of  89.8%. Each file (uncompressed) contains 350 images, but one needs to write the data out as a png file (or similar) in order to see the images.

Data are archived by date and are stored as .tar.gz files. 

For a detailed description, see two manuscripts in preparation by Jensen et al., available from the author.

Data access

  • ORDER data for delivery by FTP

Additional information

Data Quality final
  • 1.0 (2019-06-25)
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Related projects
Frequency continuous
Language English
GCMD Science Keywords Expand keywords
Related links

Temporal coverage

Begin datetime 2008-10-01 00:00:00
End datetime 2008-11-30 23:59:00

Spatial coverage

Map data from IBCSO, IBCAO, and Global Topography.

Maximum (North) Latitude: -15.00, Minimum (South) Latitude: -30.00
Minimum (West) Longitude: -90.00, Maximum (East) Longitude: -70.00

Primary point of contact information

EOL Data Support <>

Additional contact information


UCAR/NCAR - Earth Observing Laboratory. 2019. VOCALS: Giant Cloud Condensation Nuclei (CCN) Impactor Raw Data. Version 1.0. UCAR/NCAR - Earth Observing Laboratory. Accessed 18 May 2024.

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