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ORCAS Airborne Oxygen Instrument (AO2)

Summary

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.

Data access

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Additional information

Identifier
Data Quality final
Versions
  • 0.1 (2016-03-14):

    These are the quicklook field-phase data

  • 0.2 (2016-09-08):

    These are the QAQC data

  • 1.0 (2017-03-07):

    Final release data.

  • 2.0 (2021-01-29):

    The AO2 and Medusa data sets have been updated to coincide with the publication of Stephens et al., Atmospheric Measurement Techniques, 2021. For Medusa O2 data, this has included some additional flask screening and updates to the Ar/N2 correction. For AO2 O2 data, this has included more extensive QAQC and filtering updates, revisions to the time-or-flight and mean offset corrections, and implementation of an empirical ascent/descent correction, as described in the paper. For both AO2 and Medusa, the O2 data have been updated for a span correction to the SIO O2 Scale.

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Related projects
Spatial Type point
Frequency 1 second
Language English
Categories
Platforms
Instruments
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Temporal coverage

Begin datetime 2016-01-05 00:00:00
End datetime 2016-02-29 23:59:59

Spatial coverage


Map data from IBCSO, IBCAO, and Global Topography.

Maximum (North) Latitude: -30.00, Minimum (South) Latitude: -80.00
Minimum (West) Longitude: -105.00, Maximum (East) Longitude: -30.00

Primary point of contact information

EOL Data Support <datahelp@eol.ucar.edu>

Additional contact information

Citation

Stephens, B., et al. 2021. ORCAS Airborne Oxygen Instrument. Version 2.0. UCAR/NCAR - Earth Observing Laboratory. https://doi.org/10.5065/D6N29VC6. Accessed 19 Apr 2024.

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