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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Temporal Range

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


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 N/A
Standardized Resource Format UNDEFINED FORMAT
Asset Size 22 MB
Legal Constraints

These data are restricted by a user agreement: https://data.eol.ucar.edu/datafile/nph-get/490.015/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 Britton B. Stephens
Jonathan Bent
Andrew Watt
Ralph F. Keeling
Eric J. Morgan
Sara Afshar
Publisher UCAR/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 2023-05-08T22:02:53Z
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. UCAR/NCAR - Earth Observing Laboratory. https://doi.org/10.5065/D6N29VC6. Accessed 21 September 2023.

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