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IMPACT OF LAND USE CHANGE ON THE CLIMATOLOGY OF WEST AFRICA

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.

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IMPACT OF LAND USE CHANGE ON THE CLIMATOLOGY OF WEST AFRICA

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  1. 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

  2. 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

  3. MOTIVATION • PRESENT UNIQUE FEATURES OF REGION • DROUGHT • DESERTIFICATION • DEFORESTATION LANDUSE CHANGE Sahel WORSHOP ON MODELING PWC/ICTP 26-96 June 2003

  4. MAIN CLIMATOLOGICALFEATURES • LOWER TROPOSPHERE (MONSOON) • MIDDLE TROPOSPHERE (AEJ) • UPPER TROSPOSPHERE (TEJ) WORSHOP ON MODELING PWC/ICTP 26-96 June 2003

  5. MODEL CONFIGURATION-1 • Physics : - Spatial resolution : • Horizontal - 50 km • Vertical - 18 and 23 level - Schemes : • AS / FC • GRELL / AS WORSHOP ON MODELING PWC/ICTP 26-96 June 2003

  6. MODEL CONFIGURATION-2 • Run length:38 days • 25/07/96 to 01/09/96 • 25/07/95 to 01/09/95 • Initial & lateral boundary conditions : ECMWF Re-analysis(ERA) WORSHOP ON MODELING PWC/ICTP 26-96 June 2003

  7. 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

  8. SENSITIVITY TESTS • Landuse change: • Default • Corrected • Scenarios - 75% desert, 25% savanna • CPS and Vertical Resolution WORSHOP ON MODELING PWC/ICTP 26-96 June 2003

  9. LANDUSE MAPS USGS Default Corrected Scenario WORSHOP ON MODELING PWC/ICTP 26-96 June 2003

  10. MLY. MEAN TEMPERATURE ERA DEF SCE COR WORSHOP ON MODELING PWC/ICTP 26-96 June 2003

  11. MONTHLY MEAN AEJ ERA DEF SCE WORSHOP ON MODELING PWC/ICTP 26-96 June 2003

  12. MONTHLY MEAN TEJ ERA DEF SCE WORSHOP ON MODELING PWC/ICTP 26-96 June 2003

  13. MONTHLY MEAN SPC. HUMIDITY ERA SCE DEF WORSHOP ON MODELING PWC/ICTP 26-96 June 2003

  14. PRECIP SCE-ACC DEF-ACC DEF-CONV WORSHOP ON MODELING PWC/ICTP 26-96 June 2003

  15. 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

  16. THANK YOU WORSHOP ON MODELING PWC/ICTP 26-96 June 2003

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