ORCAS Airborne Oxygen Instrument (AO2) https://data.eol.ucar.edu/dataset/490.015 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. Identifiers * Local archive identifier: 490.015 * doi:10.5065/D6N29VC6 https://doi.org/10.5065/D6N29VC6 Versions 0.1: These are the quicklook field-phase data 0.2: These are the QAQC data 1.0: Final release data. 2.0: 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. 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 26 Apr 2024. Additional citation styles can be generated by entering the DOI at CrossCite (https://citation.crosscite.org/). Acknowledgement In addition to the citation reference and any other acknowledgements, please acknowledge NCAR/EOL in your publications with text such as: Data provided by NCAR/EOL under the sponsorship of the National Science Foundation. https://data.eol.ucar.edu/ Related projects * ORCAS: The O2/N2 Ratio and CO2 Airborne Southern Ocean (ORCAS) Study https://data.eol.ucar.edu/project/ORCAS Additional information * Spatial Type: point * Frequency: 1 second * Language: English Categories * Aircraft Platforms * NSF/NCAR GV HIAPER Instruments * AO2 - Airborne Oxygen GCMD Science Keywords * EARTH SCIENCE > ATMOSPHERE > ATMOSPHERIC CHEMISTRY > CARBON AND HYDROCARBON COMPOUNDS > ATMOSPHERIC CARBON DIOXIDE * EARTH SCIENCE > ATMOSPHERE > ATMOSPHERIC CHEMISTRY > OXYGEN COMPOUNDS > MOLECULAR OXYGEN Documentation * AO2_readme_210126.pdf [124 KiB] https://data.eol.ucar.edu/file/download/52CC4654D6B14/AO2_readme_210126.pdf Restrictions * EULA: ORCAS_Data_Fair_Use.html [3 KiB] https://data.eol.ucar.edu/file/download/52CC466B1493E/ORCAS_Data_Fair_Use.html Related links * companion: 112.134: Multiple Project 2008-2016 Airborne Oxygen Instrument (AO2) Data https://data.eol.ucar.edu/dataset/112.134 * info: Airborne Oxygen Instrument Documentation https://www.eol.ucar.edu/instruments/airborne-oxygen-instrument * homepage: ORCAS Project Homepage https://www.eol.ucar.edu/field_projects/orcas * info: ORCAS Missions http://catalog.eol.ucar.edu/orcas/tools/missions * info: ORCAS Data Policy https://www.eol.ucar.edu/content/orcas-data-policy Temporal coverage * Begin datetime: 2016-01-05 00:00:00 * End datetime: 2016-02-29 23:59:59 Spatial coverage * Maximum (North) Latitude: -30.00 * Minimum (South) Latitude: -80.00 * Minimum (West) Longitude: -105.00 * Maximum (East) Longitude: -30.00 Primary contact information * pointOfContact: EOL Data Support https://data.eol.ucar.edu/contact/show/1 Additional contact information * author: Britton B. Stephens https://data.eol.ucar.edu/contact/show/971 * author: Jonathan Bent https://data.eol.ucar.edu/contact/show/2235 * author: Andrew Watt https://data.eol.ucar.edu/contact/show/2236 * author: Ralph F. Keeling https://data.eol.ucar.edu/contact/show/1604 * author: Eric J. Morgan https://data.eol.ucar.edu/contact/show/2237 * author: Sara Afshar https://data.eol.ucar.edu/contact/show/2238 Alternate metadata formats * DataCite: https://data.eol.ucar.edu/dataset/490.015?format=datacite * ISO/TC 211: https://data.eol.ucar.edu/dataset/490.015?format=isotc211