ORCAS Airborne Oxygen Instrument (AO2)

The NCAR Airborne Oxygen Instrument (AO2) was mounted onboard 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 with research flights from Punta Arenas, Chile from 5 January to 29 February 2016. The submitted AO2 data are in 1 flat ascii text file per flight. Each file contains 1 Hz interpolated values (of the original ~ 2.5-second data) matching the times in the RAF data files. The files are in NASA Ames 1001 format, with a final comment line of variable names (UT CO2_AO2orig O2_AO2orig APO_AO2orig CO2_AO2 O2_AO2 APO_AO2), spaces separating columns, and 9999.99 for missing data. The reported times correspond to when the air entered the inlet. This instrument measures O2/N2 ratio as well as CO2 concentration.

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Questions? Email Resource Support Contact:

  • EOL Data Support
    datahelp@eol.ucar.edu
    NSF NCAR Earth Observing Laboratory

Temporal Range

  • Begin:  2016-01-05T00:00:00Z
    End:  2016-02-29T23:59:59Z

Keywords

Resource Type dataset
Temporal Range Begin 2016-01-05T00:00:00Z
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 grid
Spatial Resolution N/A
Related Links

Documentation #1 : AO2_readme_210126.pdf

112.134 : is a companion to dataset 490.015
Additional Information N/A
Resource Format ASCII: ASCII Text (text/plain)
Standardized Resource Format ASCII
Asset Size 22 MB
Legal Constraints

These data are restricted by a user agreement: https://data.eol.ucar.edu/file/download/52CC466B1493E/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 NSF NCAR Earth Observing Laboratory
Distributor NSF NCAR Earth Observing Laboratory
Metadata Contact Name EOL Data Support
Metadata Contact Email datahelp@eol.ucar.edu
Metadata Contact Organization NSF NCAR Earth Observing Laboratory

Author Britton B. Stephens ORCID icon
Jonathan Bent ORCID icon
Andrew Watt
Ralph F. Keeling ORCID icon
Eric J. Morgan
Sara Afshar
Publisher NSF NCAR Earth Observing Laboratory
Publication Date 2021-01-29T17:43:53
Digital Object Identifier (DOI) https://doi.org/10.5065/D6N29VC6
Alternate Identifier 490.015
Resource Version 2.0
Topic Category climatologyMeteorologyAtmosphere
Progress completed
Metadata Date 2025-10-07T21:45:02Z
Metadata Record Identifier edu.ucar.eol::490.015
Metadata Language eng; USA
Suggested Citation Britton B. Stephens, Jonathan Bent, Andrew Watt, Ralph F. Keeling, Eric J. Morgan, Sara Afshar. (2021). ORCAS Airborne Oxygen Instrument (AO2). 2.0. NSF NCAR Earth Observing Laboratory. https://doi.org/10.5065/D6N29VC6. Accessed 22 January 2026.

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