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The Structure of AEWs in the CFSR and their Relationship with Convection

The Structure of AEWs in the CFSR and their Relationship with Convection. Motivation. Long-lived synoptic-scale disturbances known as African Easterly Waves (AEWs) play an important role in modulating rainfall during the West African Monsoon (WAM).

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The Structure of AEWs in the CFSR and their Relationship with Convection

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  1. The Structure of AEWs in the CFSR and their Relationship with Convection

  2. Motivation • Long-lived synoptic-scale disturbances known as African Easterly Waves (AEWs) play an important role in modulating rainfall during the West African Monsoon (WAM). • The diabatic heating associated with deep moist convection is important to determining both the structure of synoptic systems and their upscale impact. • Recent observations such as those from the MIT radar (e.g. Barthe et al., 2010) and the latest generation of reanalyses (CFSR and MERRA) finally allow for a comparison.

  3. Tracking Methodology • Tracking field: 2 day low-pass filtered 700 hPa circulation (3° radius). • Tracked vortices: Iterative solving of a cost function of speed change and direction change (e.g. Hodges, 1999) for maxima exceeding 2x10-5s-1 over 1998-2009. • Composited vortices with >10° westward propagation lasting > 2 days in 5° wide longitudinal bins every 5° from 30°W to 30°E excluding > TD.

  4. Intensity Change of AEWs

  5. 700 hPa Streamfunctionand Rainrate (TRMM 3b42 0.25° 3-hrly) 20°E, 15°E , 10°E , 5°E , 0°E , 5°W , 10°W , 15°W , 20°W , 25°W , 30°W

  6. TRMM 3B42 3hrly Average

  7. TRMM 3B42 3hrly Average

  8. TRMM 3B42 3hrly Average

  9. TRMM 3B42 3hrly Average

  10. TRMM 3B42 3hrly Average

  11. TRMM 3B42 3hrly Average

  12. TRMM 3B42 3hrly Average

  13. TRMM 3B42 3hrly Average

  14. TRMM 3B42 3hrly Average

  15. TRMM 3B42 3hrly Average

  16. TRMM 3B42 3hrly Average

  17. 925 hPa θ and θ’ 20°E, 15°E , 10°E , 5°E , 0°E , 5°W , 10°W , 15°W , 20°W , 25°W , 30°W

  18. CFSR Analysis

  19. CFSR Analysis

  20. CFSR Analysis

  21. CFSR Analysis

  22. CFSR Analysis

  23. CFSR Analysis

  24. CFSR Analysis

  25. CFSR Analysis

  26. CFSR Analysis

  27. CFSR Analysis

  28. CFSR Analysis

  29. CFSR Analysis

  30. 925 Relative Vorticity and Wind 20°E, 15°E , 10°E , 5°E , 0°E , 5°W , 10°W , 15°W , 20°W , 25°W , 30°W

  31. CFSR Analysis

  32. CFSR Analysis

  33. CFSR Analysis

  34. CFSR Analysis

  35. CFSR Analysis

  36. CFSR Analysis

  37. CFSR Analysis

  38. CFSR Analysis

  39. CFSR Analysis

  40. CFSR Analysis

  41. 850 hPa RH 20°E, 15°E , 10°E , 5°E , 0°E , 5°W , 10°W , 15°W , 20°W , 25°W , 30°W

  42. CFSR Analysis

  43. CFSR Analysis

  44. CFSR Analysis

  45. CFSR Analysis

  46. CFSR Analysis

  47. CFSR Analysis

  48. CFSR Analysis

  49. CFSR Analysis

  50. CFSR Analysis

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