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SPICULE: Giant Cloud Condensation Nuclei (CCN) Impactor Data


The NCAR/EOL/RAF Giant Cloud Condensation Nuclei Impactor (GNI) samples giant aerosol particles.  This data set was acquired during the SPICULE project. 

Slides were exposed in the free air stream onto uncoated polycarbonate microscope slides. The slides were analyzed in the NCAR/EOL/RAF GNI slide chamber, using a dual-optical microscope. Slides were inserted into the humidified chamber with a relative humidity of  89.8 %. The images were analyzed using an automated edge detection algorithm, and using spherical cap geometry to determine the solution drop volume. Subsequently, the equivalent dry NaCl equivalent radius was determined using the Kohler equation for concentrated solutions, specifically Pruppacher and Klett, 1978, eq. 6.26b, using a full chemical potential calculation.

Data access

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Additional information

Data Quality final
  • 1.0 (2021-08-12)
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Related projects
Spatial Type raster
Frequency no set schedule
Language English
GCMD Science Keywords Expand keywords
Related links

Temporal coverage

Begin datetime 2021-04-26 00:00:00
End datetime 2021-06-30 23:59:59

Spatial coverage

Map data from IBCSO, IBCAO, and Global Topography.

Maximum (North) Latitude: 41.00, Minimum (South) Latitude: 37.00
Minimum (West) Longitude: -109.00, Maximum (East) Longitude: -102.00

Primary point of contact information

EOL Data Support <>


UCAR/NCAR - Earth Observing Laboratory. 2021. SPICULE: Giant Cloud Condensation Nuclei (CCN) Impactor Data. Version 1.0. UCAR/NCAR - Earth Observing Laboratory. Accessed 25 May 2024.

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