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.

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Presentation transcript:

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 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 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 Deriving Horizontal Winds from Sonde: GPS position (latitude/longitude/altitude) reported every 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 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 MMS warmer than RS-80 by /- 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.