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Rainfall Estimation in Bangladesh: Analysis of CMAP Grids vs. BMD Observations

This study compares rainfall estimation in Bangladesh using CMAP grids and BMD observations, showing substantial underestimation in 1984 and improvements post-1992, with grid C providing better accuracy possibly due to Indian data. The analysis emphasizes the significance of the data sources and their impact on understanding rainfall trends in Bangladesh.

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Rainfall Estimation in Bangladesh: Analysis of CMAP Grids vs. BMD Observations

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  1. Estimation of Rainfall over Bangladesh Toru Terao(Osaka Gakuin Univ.)

  2. 1999 2000 TRMM 3A25 Monthly Ｊｕｌ Ａｕｇ 1998 Bangladesh Flood

  3. １９９９ Rainfall South of Hills is not Represented? CMAP Ｊｕｌ Ａｕｇ １９９８ Bangladesh Flood

  4. Raingauges in Bangladesh • BMD(Bang. Met. Dep.) • Daily • 1950-2001 ×

  5. D C A B CMAP Grids • CMAP grids over Bangla. • We examined... • Grid A: 12 BMD stations • Grid B: 9 BMD stations • Grid C: 9 BMD stations • Grid D: No BMD stations

  6. CMAP timeseries (JJAS) A B Good correlation after 1992 Significant underestimation in 1984 when severe flood attacked Bangladesh C

  7. A Comparison, Grid A • Jun: 0.07 • Jul: 0.46 • Aug: 0.29 • Sep: 0.25 • JJAS: 0.08 • -1991: -0.41 • 1992-: 0.95

  8. B Comparison, Grid B • Jun: 0.30 • Jul: 0.54 • Aug: 0.62 • Sep: 0.44 • JJAS: 0.16 • -1991: 0.06 • 1992-: 0.86

  9. C Comparison, Grid C • Jun: 0.78 • Jul: 0.79 • Aug: 0.40 • Sep: 0.66 • JJAS: 0.63 • -1991: 0.48 • 1992-: 0.96

  10. A A Raingauges vs. Grid A

  11. Raingauges vs. Grid B B B

  12. C C Raingauges vs. Grid C

  13. CMAP Grid vs. BMD Obs. • Drastic change around 1991-1992 • Small correlation before 1991 • Significant Underestimation in 1984 • Large correlation after 1992 • Better estimation for grid C • due to Indian data?

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