Mms ozonesonde wind and temperature comparison during cr ave
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MMS - Ozonesonde Wind and Temperature Comparison during CR-AVE. T.P. Bui, J. Dean-Day, C. Chang, R. Castaneda NASA-Ames Research Center H. Voemel University of Colorado -- CIRES. Data Sources. Profiles of WB-57 MMS 1-Hz U, V, T and P during descent to Juan SantaMaria Int Airport

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MMS - Ozonesonde Wind and Temperature Comparison during CR-AVE

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Mms ozonesonde wind and temperature comparison during cr ave

MMS - Ozonesonde Wind and Temperature Comparison during CR-AVE

T.P. Bui, J. Dean-Day, C. Chang, R. Castaneda

NASA-Ames Research Center

H. Voemel

University of Colorado -- CIRES


Data sources

Data Sources

  • Profiles of WB-57 MMS 1-Hz U, V, T and P during descent to Juan SantaMaria Int Airport

  • Vaisala RS-80 radiosonde collected GPS position (latitude/longitude), T and P during Ozonesonde ascents from Heredia, Costa Rica

  • Heredia is in close proximity to Juan SantaMaria airport (10km distance separation)

  • Sondes launched within 1 hr of WB-57 takeoff or landing on 11 flights (10 descents, 1 ascent)


Data specifications

Data Specifications

  • Meteorological Measurement System:

    Static Pressure (+/- 0.3 mb)

    Static Temperature (+/- 0.3 K)

    Wind Velocity (+/- 1.0 m/s)

  • Vaisala RS-80 Radiosonde:

    Static Pressure (+/- 0.1 – 1.0 mb)

    Static Temperature (+/- 0.2 K)

    (Temperature corrected for radiation/ventilation effects)

  • Combined Uncertainty at same time/location:

    Temperature (+/- 0.5 K)


Rs 80 wind calculation

RS-80 Wind Calculation

  • Deriving Horizontal Winds from Sonde:

    GPS position (latitude/longitude/altitude) reported every 1 - 2 seconds during ascent to ~ 30km altitude

    Time rates of GPS latitude/longitude define U,V midway between GPS altitude levels

    U,V at reported levels estimated from spline interpolation of instantaneous U,V to each GPS altitude level

    Resulting U,V profiles were highly variable;

    Wind profiles subjected to simple vertical averaging to remove scales < 100m (approximately 20 sec during 5 m/s ascent)


Ideal comparison

Ideal Comparison

  • MMS and Sonde BOTH report GPS position:

    > Interpolate MMS data to ozone sonde GPS altitude

    > Minimum temporal/spatial separation

  • Ideal conditions for MMS–RS80 comparison:

    > All profiles are within 2 hours in time

    > Spatial separation < 60 km

    > In generally horizontal homogeneous environment (tropics)


Comparison summary

Comparison Summary

MMS warmer than RS-80 by 0.30 +/- 0.20K

MMS Wind Velocity slightly lower (~ 0.65 m/s)

but uncertainty is larger than mean differences

  • Pressure Difference is within RS-80 max error (1 mb)

    Sonde pressure is lower by 0.7 mb; larger uncertainty at lower altitudes scale with pressure.


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