OWP: Radiosondes and profilers Doug Parker, CEH Wallingford, 21 January 2005.
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Transcript of OWP: Radiosondes and profilers Doug Parker, CEH Wallingford, 21 January 2005.
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OWP: Radiosondes and profilers
Doug Parker,CEH Wallingford, 21 January
2005
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Why are the radiosondes needed?• Data assimilation
– Detailed (sustainable) analysis of weather and climate– Data impact studies
Is the existing network sufficient to analyse the atmosphere ?
Adrian Tompkins
(ECMWF)
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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
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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
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‘AMMA’ network ASECNANew stations
Non-ASECNANot reporting
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Quadrilaterals - fluxes
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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
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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!
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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
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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/
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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
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Tethered balloon system
• Carries a turbulence sonde
• Ceiling ~ 2 km
• To be deployed June to September 2006
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3 sodars• To be deployed in one of the surface flux
mesosites (probably around Niamey)• June to September 2006
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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