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ORCAS Medusa Flask Sampler Kernel Data


This dataset contains Medusa Flask Sampler kernel data 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. In order to compare in situ and flask values, an averaging kernel which takes into account flow rate and mixing time, tau, at time of sampling is required.

Data access

  • ORDER data for delivery by FTP
    • user agreement required

Additional information

Data Quality final
  • 0.1 (2016-03-16)
  • 1.0 (2017-03-15):

    Final release data.

  • 2.0 (2021-01-28):

    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.

(Only the current version of the data is available to order. If you have questions about a prior version, please email us.)
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Related projects
Spatial Type unknown
Frequency 1 second
Language English
GCMD Science Keywords Expand keywords
Related links

Temporal coverage

Begin datetime 2016-01-05 00:00:00
End datetime 2016-03-01 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 <>

Additional contact information


Example citation following ESIP guidelines:

Stephens, B., et al. 2021. ORCAS Medusa Flask Sampler Kernel Data. Version 2.0. UCAR/NCAR - Earth Observing Laboratory. Accessed 01 Dec 2023.

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