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Tethered Soundings & Profiling

This project utilizes a tethered balloon system for comprehensive atmospheric profiling, including temperature, relative humidity, wind speed, and direction measurements up to 25 km altitude. The balloon, filled with helium and measuring approximately 3m in diameter, is equipped with a CLASP aerosol probe for detailed aerosol analysis and turbulence measurements at 10 Hz. Data collection incorporates 24V winch systems and integrates with sonic anemometers to enhance accuracy. Mean meteorological profiles and turbulence properties are derived from the measurements, providing crucial insights into atmospheric dynamics.

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Tethered Soundings & Profiling

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  1. Tethered Soundings & Profiling Cathryn Birch Ian Brooks

  2. Radiosondes • 6 hourly launches • T, p, RH, wind speed and direction • Up to about 25km

  3. SkyDoc Balloon • Filled with helium • Diameter ~3m (inflated) Volume ~20 m3 • Static lift = 12 kg • Dynamic lift = 1 ton @ 45 m s-1 • Tether line mass = 6 g m-1 • 1.5 mile of tether available • 24 V winch

  4. Basic system from Gill instruments Leeds adding: custom motion pack + GPS Mean T, RH, P CLASP aerosol probe Control, logging, and comms board Battery powered – duration ~5 hours Turbulence measurements @ 10 Hz Mean met data @ 1Hz

  5. 25 cm Pump Sensing head CLASP instrument Compact Lightweight Aerosol Spectrometer Probe • 16 channels - 0.24 to 18.5 m diameter • Flow rate 3 l/min – high sampling statistics allows 10 Hz temporal resolution – collocation with sonic anemometer • Compact (25 x 8 x 6 cm), robust, inexpensive – short inlet tube and low flow distortion, & installation in balloon/buoy instrument package and mounted on masts

  6. winch Timed photographic record from balloon – lead fraction retrieval, cloud top imagery…

  7. Altitude (m) T (C) RH (%) WS (m s-1) Mean meteorology profiles

  8. SODAR (SOnic Detection And Ranging) – Scintec Phased Array • Measures the scattering of sound waves by atmospheric turbulence Provides • Backscatter • 3D mean winds • CT2, z/L, turbulent dissipation • Vertical resolution 10 m • 10-min averaged data

  9. Inversion Entrainment zone well mixed layer Stable BL B A C Turbulence properties : CT2 Measurements from Africa A: UTC: 12:00 C: UTC: 20:00 B: UTC: 10:00

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