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OWP: Radiosondes and profilers

OWP: Radiosondes and profilers. Doug Parker, CEH Wallingford, 21 January 2005. Why are the radiosondes needed?. Data assimilation Detailed (sustainable) analysis of weather and climate Data impact studies. Adrian Tompkins (ECMWF).

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OWP: Radiosondes and profilers

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  1. OWP: Radiosondes and profilers Doug Parker, CEH Wallingford, 21 January 2005

  2. Why are the radiosondes needed? • Data assimilation • Detailed (sustainable) analysis of weather and climate • Data impact studies Adrian Tompkins (ECMWF) Is the existing network sufficient to analyse the atmosphere ?

  3. ECMWF data impacts(Tompkins et al 2005) • All data are about equally useful, but • Radiosondes are most important at lower levels (below ~ 600 hPa ~ 16,000 ft) • Radiosonde thermodynamics are more important than all wind data

  4. Why are the radiosondes needed? SOP objectives for radiosonde data • High resolution analysis of weather systems • Coordinated with radar, aircraft … • Diurnal cycle  high frequency • Water and energy budgets • Assimilation into regional models - Regional NWP • Security of aviation

  5. ‘AMMA’ network ASECNA New stations Non-ASECNA Not reporting

  6. Quadrilaterals - fluxes

  7. Sounding frequencies on these networks • EOP/LOP: As a minimum: • March 2005 – October 2007: 1 per day • March 2006 – October 2006: 1 more per day • Total: 1220 per station (~ 20,000 soundings) • Extra: 6350 sondes contributed by AMMA-IP • SOP: Depends on operations – • Could be 8 per day; • Could make use of descent data • Plan for 4600 additional soundings

  8. AMMA RS projects: • AMMA-EU 2 MEu (includes Infrastructure) • France - limited money for upgrade and about 1000 soundings (EOP) • UK - about 880 soundings (EOP/SOP). • US - seeks funds for • SOP soundings (about 1000) • 2 ISS deployments (SOP) • Conakry + sondes (EOP/SOP) • These are relatively small-scale!

  9. Other AMMA RS activities: • Monitoring of data transmission and receipt (data collectors  ECMWF) • Monitoring PILOT network • Archiving high resolution data • Strategy and implementation for long-term support

  10. AMMA Radiosonde Group • Formed mid-2003 • Objectives: • to formulate strategy for radiosonde deployment and • to assist in liaison between data providers and data users http://www.env.leeds.ac.uk/~doug/AMMAsondes/

  11. AMMA-UK radiosondes • Budget incorporated in ‘Global’ AMMA RS budget • Purchasing through ASECNA – lower prices • We are buying priorities in the deployment! • To support the northern region (one station at higher frequency) • To support the BAe146

  12. Tethered balloon system • Carries a turbulence sonde • Ceiling ~ 2 km • To be deployed June to September 2006

  13. 3 sodars • To be deployed in one of the surface flux mesosites (probably around Niamey) • June to September 2006

  14. Sodar specifications • Thickness of layer 10 - 250 m • Lowest measurement height 20 m • Maximum range 500 - 1000 m • Averaging time 1 min to 60 min (typically 10 min) • Accuracy of Horizontal Wind speed 0.1 - 0.3 m/s • Accuracy of vertical Wind speed 0.03 - 0.1 m/s • Accuracy of wind Direction 2 - 3° • Measurement range horizontal - 50 m/s to +50 m/s • Measurement range vertical -10 m/s to +10 m/s • Operational temperature range -35 to 50 °C

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