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

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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

CSIP observational campaign was a collaborative project 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 Courtesy of Cyril Morcrette

2. Synoptic Background

1645 UTC Rainfall radar IOP9: 18th July 2005

1645 UTC MSG visible IOP9: 18th July 2005

1530 UTC CAMRa 3GHz IOP9: 18th July 2005

MSG visibleMSG WV ECMWF PVTOMS O UTC

MSG visibleMSG WV ECMWF PVTOMS O UTC

MSG visibleMSG WV ECMWF PVTOMS O UTC

MSG visibleMSG WV ECMWF PVTOMS O UTC

3. Observations of the dry layer

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

IOP9: 18 th July UTC

LID θw decreases with height… … instability!

3. How the convection was forced

1600 UTC

MSG visibleMSG WV ECMWF PVTOMS O UTC

ECMWF RH (shading) and T (contours)

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

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

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

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