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IMPACT OF LAND USE CHANGE ON THE CLIMATOLOGY OF WEST AFRICA. SARR, A. (SENEGAL) MONKAM, D. (CAMEROUN) INTSIFUL, J.D (GHANA). OUTLINE. INTRODUCTION MODEL CONFIGURATION VALIDATION AGAINST RE-ANALYSIS AND CRU DATA SENSITIVITY TESTS CONCLUSION AND OUTLOOK FOR FUTURE RESEARCH. - PowerPoint PPT Presentation
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WORSHOP ON MODELING PWC/ICTP 26-96 June 2003
IMPACT OF LAND USE CHANGE ON THE CLIMATOLOGY OF
WEST AFRICA
SARR, A. (SENEGAL) MONKAM, D. (CAMEROUN)
INTSIFUL, J.D (GHANA)
WORSHOP ON MODELING PWC/ICTP 26-96 June 2003
OUTLINE
• INTRODUCTION
• MODEL CONFIGURATION
• VALIDATION AGAINST RE-ANALYSIS
AND CRU DATA
• SENSITIVITY TESTS
• CONCLUSION AND OUTLOOK FOR
FUTURE RESEARCH
WORSHOP ON MODELING PWC/ICTP 26-96 June 2003
MOTIVATION
• PRESENT UNIQUE FEATURES OF REGION
DROUGHTDESERTIFICATIONDEFORESTATION
LANDUSE CHANGE
WORSHOP ON MODELING PWC/ICTP 26-96 June 2003
MAIN CLIMATOLOGICALFEATURES
• LOWER TROPOSPHERE (MONSOON)
• MIDDLE TROPOSPHERE (AEJ)
• UPPER TROSPOSPHERE (TEJ)
WORSHOP ON MODELING PWC/ICTP 26-96 June 2003
MODEL CONFIGURATION-1
• Physics : - Spatial resolution :
Horizontal - 50 kmVertical - 18 and 23 level
- Schemes : AS / FC GRELL / AS
WORSHOP ON MODELING PWC/ICTP 26-96 June 2003
MODEL CONFIGURATION-2
• Run length : 38 days 25/07/96 to 01/09/9625/07/95 to 01/09/95
• Initial & lateral boundary conditions : ECMWF Re-analysis(ERA)
WORSHOP ON MODELING PWC/ICTP 26-96 June 2003
VALIDATION AGAINST REANALISES & CRU DATA
• Surface temperature• Meridioanal flux at 925 hPa• Zonal wind filed at 700 hPa• Zonal wind field at 200 hPa
WORSHOP ON MODELING PWC/ICTP 26-96 June 2003
SENSITIVITY TESTS
• Landuse change:
Default CorrectedScenarios - 75% desert, 25% savanna
• CPS and Vertical Resolution
WORSHOP ON MODELING PWC/ICTP 26-96 June 2003
LANDUSE MAPS
Corrected Scenario
DefaultUSGS
WORSHOP ON MODELING PWC/ICTP 26-96 June 2003
MLY. MEAN TEMPERATURE
DEF
SCE
COR
ERA
WORSHOP ON MODELING PWC/ICTP 26-96 June 2003
MONTHLY MEAN AEJ
DEFSCE
ERA
WORSHOP ON MODELING PWC/ICTP 26-96 June 2003
MONTHLY MEAN TEJ
ERA
SCEDEF
WORSHOP ON MODELING PWC/ICTP 26-96 June 2003
DEF SCE
ERA
MONTHLY MEAN SPC. HUMIDITY
WORSHOP ON MODELING PWC/ICTP 26-96 June 2003
PRECIP
DEF-CONV
SCE-ACC
DEF-ACC
WORSHOP ON MODELING PWC/ICTP 26-96 June 2003
CONCLUSION AND OUTLOOK FOR FUTURE RESEARCH
• OBSERVED CLIMATIC CHANGES IN LAND USE SCENARIO• GENERAL FEATURES OF TEMP.,TEJ & AEJ WELL CAPTURED
WITH FEW DISCREPANCIES (LOCALLY)• GENERAL FEATURES OF HUMIDITY WELL CAPTURED BUT
BIAS OVER THE OCEAN AND INLAND• FEATURES OF TOTAL PRECIP. POORLY CAPTURED DUE TO
CONFIGURATION PROBLEMS AND PHYSICS • GENERAL FEATURES OF CONVECTIVE PRECIP. WELL
CAPTURED BUT SIGNAL TOO WEAK TO REFLECT IN TOTAL PRECIP.
• RESULTS ONLY PRELIMINARY & NEEDS MORE OPTIMISATION• OF THE MODEL PHYSICS
WORSHOP ON MODELING PWC/ICTP 26-96 June 2003
THANK YOU
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