EFFECT OF MODEL RESOLUTION EFFECT OF MODEL RESOLUTION VARIATION VARIATION 11ON THE SIMULATION OF ON THE SIMULATION OF PRECIPITATION OVER WEST AFRICAPRECIPITATION OVER WEST AFRICA

MOTIVATION:MOTIVATION:– 1998 FLOOD OVER WA SAHEL (>> NORMAL)1998 FLOOD OVER WA SAHEL (>> NORMAL)– NEED TO USE REGCM TO ATTEMPT NEED TO USE REGCM TO ATTEMPT

SIMULATION OF THE 1998 FLOODSIMULATION OF THE 1998 FLOOD– NEED TO FORECAST PRECIPITATION NEED TO FORECAST PRECIPITATION

REGIMES IN WA TO SUPPORT CC IMPACT REGIMES IN WA TO SUPPORT CC IMPACT ASSESSMENTASSESSMENT

DOMAIN PARAMETERS80km Domain80km Domain

Map Projection : MERCATOR

48 grid points N - S 55 grid points E - W 18 vertical levels September 1998

40km Domain40km Domain Map Projection :

MERCATOR 96 grid points N - S 111 grid points E - W 18 vertical levels September 1998

West African TopographyWest African Topography

MODEL PHYSICSMODEL PHYSICS

Cumulus param. Scheme:Cumulus param. Scheme: Grell Grell

Closure Assumption:Closure Assumption:ASAS

Results - PrecipitationResults - Precipitation40km 80km

Results: Surf Air TempResults: Surf Air Temp

Results: Evolution of Wind Results: Evolution of Wind FieldsFields

Results: Evolution of WindsResults: Evolution of Winds

Evolution of WindsEvolution of Winds

Evolution of WindsEvolution of Winds

Evolution of WindsEvolution of Winds

Evolution of WindsEvolution of Winds

Evolution of WindsEvolution of Winds