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Estimation of Rainfall over Bangladesh

Estimation of Rainfall over Bangladesh. Toru Terao(Osaka Gakuin Univ.). 1999. 2000. TRMM 3A25 Monthly. Ｊｕｌ. Ａｕｇ. 1998. Bangladesh Flood. １９９９. Rainfall South of Hills is not Represented?. CMAP. Ｊｕｌ. Ａｕｇ. １９９８. Bangladesh Flood. Raingauges in Bangladesh. BMD(Bang. Met. Dep.) Daily

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Estimation of Rainfall over Bangladesh

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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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