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Convective intensification induced by a descending dry layer: a case study of CSIP IOP 9

Convective intensification induced by a descending dry layer: a case study of CSIP IOP 9. Andrew Russell and Geraint Vaughan Centre for Atmospheric Sciences University of Manchester. 1. CSIP – The Convective Storm Initiation Project. United Kingdom Universities of: * Reading * Leeds

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Convective intensification induced by a descending dry layer: a case study of CSIP IOP 9

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  1. Convective intensification induced by a descending dry layer: a case study of CSIP IOP 9 Andrew Russell and Geraint Vaughan Centre for Atmospheric Sciences University of Manchester

  2. 1. CSIP – The Convective Storm Initiation Project

  3. United Kingdom Universities of: * Reading * Leeds * Manchester * Salford * Bath The Met Office Chilbolton Observatory Germany Institut für Meteorologie und Klimaforschung (IMK), Karlsruhe Universität Braunschweig GeoForschungsZentrum, Potsdam CSIP observational campaignwas a collaborative project Courtesy of Cyril Morcrette

  4. Courtesy of Cyril Morcrette

  5. 2. Synoptic Background

  6. IOP9: 18th July 2005 Rainfall radar 1645 UTC

  7. IOP9: 18th July 2005 MSG visible 1645 UTC

  8. IOP9: 18th July 2005 CAMRa 3GHz 1530 UTC

  9. MSG visible MSG WV ECMWF PV TOMS O3 1200 UTC

  10. MSG visible MSG WV ECMWF PV TOMS O3 1200 UTC

  11. MSG visible MSG WV ECMWF PV TOMS O3 1200 UTC

  12. MSG visible MSG WV ECMWF PV TOMS O3 1200 UTC

  13. 3. Observations of the dry layer

  14. GPS Water Vapour - Linkenholt θw (ºC) and 10% Relative Humidity (RH) from Radiosondes - Swanage SNR from wind profiling radar – Linkenholt (plotted over Swanage sonde data)

  15. IOP9: 18th July 2005 1645 UTC

  16. θw decreases with height… LID … instability!

  17. 3. How the convection was forced

  18. 1600 UTC

  19. MSG visible MSG WV ECMWF PV TOMS O3 1200 UTC

  20. ECMWF RH (shading) and T (contours) 1200 UTC

  21. ECMWF PV (shading and contours) and θ (dashed contours) 1200 UTC

  22. For more thoughts on the upper-level origin of atmospheric lids, see my poster…

  23. 4. Conclusions Convective showers over southern England behind a cold front Dry intrusion overran moist surface layer resulting in potential instability Convection capped at 6 km by uppermost dry layer Interesting observations of the double descending layer, which had a role in both forcing and inhibiting the convection Andrew Russell Centre for Atmospheric Sciences University of Manchester andrew.russell-2@manchester.ac.uk www.andrewrussell.co.uk

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