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Low Rate (LRT - 1 sps) Navigation, State Parameter, and Microphysics Flight-Level Data


This data set includes airborne measurements obtained from the NSF/NCAR HIAPER GV aircraft (Tail Number N677F) during the ORCAS (The O2/N2 Ratio and CO2 Airborne Southern Ocean Study) project. This dataset contains low rate navigation, state parameter, and microphysics flight-level data in netCDF format. 

Note: Due to a timeserver problem, there is no data available for RF12, and the data for RF13 is only available for the second half of the flight.

Data access

  • ORDER data for delivery by FTP

Additional information

Data Quality final
  • 0.1 (2016-02-22)
  • 0.2 (2016-05-26):

    New files for all flights (include TF) with 2DC vars instead of 1DC

  • 1.0 (2016-11-07):

    Includes Ht above terrain post-processing

  • 1.1 (2018-10-16):

    Version 1.1 has corrected 2DC data (variables CONC2DCA_LWO, DBAR2DCA_LWO, and PLWC2DCA_LWO). No other data has been changed.

    It was discovered that all particles in a single buffer were time-stamped with the data-system time tag of the end off the buffer. For concentrations above 5-10/L, or when in heavy cloud, the system writes multiple buffers per second so the time-stamp will be very close to accurate. When a buffer spans multiple seconds, all the particles were previously binned to the second of the end time-stamp for the buffer. This has now been corrected so data is timestamped across the time-period of the buffer correctly.

    In addition, V1.1 changes 2D processing from reconstruction to center-in.

(Only the current version of the data is available to order. If you have questions about a prior version, please email us.)
Metadata download

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Related projects
Spatial Type point
Frequency 1 second
Language English
Related links

Temporal coverage

Begin datetime 2016-01-05 18:11:55
End datetime 2016-03-01 22:45:00

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:

UCAR/NCAR - Earth Observing Laboratory. 2018. Low Rate (LRT - 1 sps) Navigation, State Parameter, and Microphysics Flight-Level Data. Version 1.1. UCAR/NCAR - Earth Observing Laboratory. Accessed 14 Oct 2019.

Today's date is shown: please replace with the date of your most recent access.

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