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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

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.)
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Related projects
Spatial Type point
Frequency 1 second
Language English
GCMD Science Keywords Expand keywords
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 01 Jun 2020.

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

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