AMMA-UK WP3 – Convection and dynamics. Doug Parker Institute for Atmospheric Science School of Earth and Environment University of Leeds 29 November 2004. WP3 Objectives.
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Institute for Atmospheric Science
School of Earth and Environment
University of Leeds
29 November 2004
To explain the basic dynamics and transport properties of the WAM system, including the diurnal cycle of the boundary layer control on the monsoon, and the response to shallow and deep cumulus convection.
Moist convection in the south, dry convection in the north (the Sahara): a ‘natural laboratory’ for tropical continental convection.
African Easterly Jet (AEJ) 600 hPa
Water vapour 17/6/97
Deep convection (the Sahara): a
1. The analysis of the African Easterly Jet is good (the Sahara): a
ECMWF analyses (Adrian Tompkins; in Thorncroft et al, BAMS 2003):
2. The forecast has systematic error (the Sahara): a
Courtesy Tompkins, ECMWF.
700 hPa zonal winds, averaged over August 2003
Systematic error! We need to represent the physics better.
3. Significnt errors in ECMWF PBL fields compared to observations
Equivalent potential temperature
(Aida Diongue; in
Thorncroft et al., BAMS 03)
Surface temperature (1200 UTC) and boundary layer TKE in the afternoon (around 1500 UTC)
Chris Taylor, CEH Wallingford
C. M. Taylor circulationset al, QJRMS, 2005