ORCAS Giant Nuclei Impactor (GNI) NaCl-equivalent Sea-Salt Size Distributions

This dataset contains Giant Nuclei Impactor (GNI) NaCl-equivalent Sea-Salt Size Distributions collected by the NSF/NCAR GV HIAPER (Gulfstream-V High-performance Instrumented Airborne Platform for Environmental Research) aircraft (Tail Number N677F) during the ORCAS (O2/N2 Ratio and CO2 Airborne Southern Ocean Study) campaign. The size distributions are given as spherical dry radius in 97 bins each of 0.2 μm width starting from 0.8 μm (center of bin) and extending to 20 μm (center of bin). The data were obtained by exposing polycarbonate in the free air streak outside the NSF/NCAR GV aircraft. Slides are available for ORCAS research flights RF08, RF15 and RF17. The slides were analyzed in the NCAR/EOL/RAF GNI slide chamber, using a dual-optical microscope. Slides were inserted into a humidified chamber with a relative humidity of 90%. 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 (Sodium Chloride) equivalent radius was determined using the Kohler equation for concentrated solutions. The size distributions are intended to be used as aerosol size distributions (Giant Cloud Condensation Nuclei, GCCN) for cloud modeling studies, as aerosol size distributions for atmospheric radiation studies, and as aerosol size distributions for atmospheric chemistry studies.

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Temporal Range

  • Begin:  2016-02-05T00:00:00Z
    End:  2016-02-29T23:59:59Z


Resource Type dataset
Temporal Range Begin 2016-02-05T00:00:00Z
Temporal Range End 2016-02-29T23:59:59Z
Temporal Resolution N/A
Bounding Box North Lat -30.00000
Bounding Box South Lat -80.00000
Bounding Box West Long -105.00000
Bounding Box East Long -30.00000
Spatial Representation N/A
Spatial Resolution N/A
Related Links

Documentation #1 : ORCAS_GNI_readme.txt

Additional Information N/A
Resource Format N/A
Standardized Resource Format UNDEFINED FORMAT
Asset Size 1 MB
Legal Constraints

These data are restricted by a user agreement: https://data.eol.ucar.edu/datafile/nph-get/490.028/ORCAS_Data_Fair_Use.html

Access Constraints none
Software Implementation Language N/A

Resource Support Name EOL Data Support
Resource Support Email datahelp@eol.ucar.edu
Resource Support Organization UCAR/NCAR - Earth Observing Laboratory
Distributor UCAR/NCAR - Earth Observing Laboratory
Metadata Contact Name EOL Data Support
Metadata Contact Email datahelp@eol.ucar.edu
Metadata Contact Organization UCAR/NCAR - Earth Observing Laboratory

Author UCAR/NCAR - Earth Observing Laboratory
Publisher UCAR/NCAR - Earth Observing Laboratory
Publication Date 2017-03-17T16:06:49
Digital Object Identifier (DOI) https://doi.org/10.5065/D69885FD
Alternate Identifier 490.028
Resource Version 1.0
Topic Category climatologyMeteorologyAtmosphere
Progress completed
Metadata Date 2023-05-08T22:02:54Z
Metadata Record Identifier edu.ucar.eol::490.028
Metadata Language eng; USA
Suggested Citation UCAR/NCAR - Earth Observing Laboratory. (2017). ORCAS Giant Nuclei Impactor (GNI) NaCl-equivalent Sea-Salt Size Distributions. 1.0. UCAR/NCAR - Earth Observing Laboratory. https://doi.org/10.5065/D69885FD. Accessed 22 September 2023.

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