Tamdar/amdar data Assessments using the ruc at noaa’s Global Systems Division Part of noaa’s Earth System Research Laboratory (esrl)


НазваTamdar/amdar data Assessments using the ruc at noaa’s Global Systems Division Part of noaa’s Earth System Research Laboratory (esrl)
Дата конвертації20.04.2013
Розмір517 b.
ТипПрезентации


TAMDAR/AMDAR Data Assessments using the RUC at NOAA’s Global Systems Division

  • Part of NOAA’s Earth System Research Laboratory (ESRL)

  • Bill Moninger, Stan Benjamin, Randy Collander, Brian Jamison, Tom Schlatter, Tracy Smith, Ed Szoke


(T)AMDAR QC at GSD

  • AMDAR data are automated met. reports from aircraft – primarily jets

  • TAMDAR data are taken by a special TAMDAR sensor mounted on turboprop aircraft

  • In this study, we look at differences between

    • (T)AMDAR observations, and
    • 1h forecasts from the RUC model


The Rapid Update Cycle (RUC)

  • An hourly cycle

  • Ingests all available data each hour

    • AMDAR, TAMDAR, RAOBS (0 & 12 Z), Satellite, Surface, etc., etc.
  • Covers the CONUS

  • We run many RUC cycles at GSD

  • For this study, we use a 20 km cycle called “dev2”

  • (Stan will say more in the next talk)



(T)AMDAR - RUC Comparisons

  • Statistical results are available at http://amdar.noaa.gov/ruc_acars/

    • Time series for individual aircraft
    • 3 and 7 day interactive statistics
    • plan view of data and corresponding RUC values
    • (summary statistics are open; real-time data are restricted)




Current (T)AMDAR Data Quality

  • To assess this we look at long-term statistics of observations with respect to the RUC dev2.

  • RUC, when a long time period is aggregated, can serve as a common denominator that does not favor any particular observation system

  • Results to follow are from

    • 1-31 Dec. 2006
    • (T)AMDAR data from 0 UTC +/- 30 minutes
      • 200 - 800 observations per pressure level
      • Canadian jets and all turboprops excluded
      • All observations included, even those that fail RUC QC (excluding them makes little difference here)
    • In the Great Lakes Region
      • 13 RAOBs at 0 UTC






























Summary

  • For temperature: TAMDAR does as well as AMDAR jets in the altitude range it covers

  • For winds: TAMDAR measurements are substantially worse, particularly on descent, due to poor heading info provided by Mesaba turboprops. (Nonetheless, they make a positive impact on RUC wind forecasts, as shown in the next talk)

  • For relative humidity: TAMDAR does approximately as well as RAOBs



Thank you!



Extra slides











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