EUMETSAT 2006 Helsinki Exploitation of GERB/SEVIRI data for evaluation of the Met Office global forecast model Richard Allan, Tony Slingo Environmental.

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Presentation transcript:

EUMETSAT 2006 Helsinki Exploitation of GERB/SEVIRI data for evaluation of the Met Office global forecast model Richard Allan, Tony Slingo Environmental Systems Science Centre University of Reading, UK Sean Milton, Malcolm Brooks Met Office, Exeter, UK With thanks to the GERB International Science Team including colleagues at Imperial College and the Royal Meteorological Institute of Belgium

EUMETSAT 2006 Helsinki Objectives Validation of new datasets (GERB/SEVIRI) Timely Model Evaluation Understanding of physical processes

EUMETSAT 2006 Helsinki Recent Comparison GERBModel OLR: SW Albedo: SEVIRI Channels: 5 (left) and 10 (right)

EUMETSAT 2006 Helsinki GERB May 2006 OLR Animation Model

EUMETSAT 2006 Helsinki Evaluation of clear-sky fluxes Allan et al. (2005) JGR, 110, D14111, /2004JD005698

EUMETSAT 2006 Helsinki Model evaluation: near-real time Change in model minus GERB flux differences Relate to change in model physics implemented 13 th March | 14 th March Model SW albedo

EUMETSAT 2006 Helsinki Time-series: 1200 UTC data OLR (Wm -2 ) SW Albedo

EUMETSAT 2006 Helsinki Systematic biases Desert dust aerosol ITCZ Low cloud Surface albedo All-sky: Clear -sky: LW Model minus GERB 1200 UTC SW Convective cloud Water vapour

EUMETSAT 2006 Helsinki Model Evaluation: Namibian Stratocumulus region 31 st March 2004 Model Level

EUMETSAT 2006 Helsinki Stratocumulus: composites Model overestimates cloud albedo Reasonable simulation of cloud fraction

EUMETSAT 2006 Helsinki Large clear-sky greenhouse effect over west Sahara measured by GERB/Meteosat (July 2003) not reproduced by Met Office model Explained by large mineral dust aerosol optical depth Haywood, Allan, Slingo et al. (2005) JGR 110 D05105, doi: /2004JD005232

EUMETSAT 2006 Helsinki Dust product (upper) and GERB OLR (lower) for 1200UT on 8 March 2006 Cloud Lake Chad Dust Longwave radiative effect of desert dust from GERB/SEVIRI RADAGAST project:

EUMETSAT 2006 Helsinki March 2006 dust outbreak: Niamey, Niger Units: (Wm -2 ) TOA SFC ATM Combine GERB, SEVIRI & CERES top of atmosphere measurements with ARM surface observations… Atmospheric divergence

EUMETSAT 2006 Helsinki Summary Ongoing near-real time comparisons of GERB/SEVIRI and Model Validation of new datasets –GERB/SEVIRI, surface observations Timely model evaluation –e.g. new physical parametrizations Process studies –e.g., stratocumulus, surface properties, mineral dust, radiative flux divergence…

EUMETSAT 2006 Helsinki Time-series: Model-GERB OLR (Wm -2 ) SW Albedo

EUMETSAT 2006 Helsinki Model Evaluation: Namibian Stratocumulus region 31 st March 2004 Model Level Lock (2001) Local time