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Relationship between the Tibetan Plateau Heating and East Asian Summer Monsoon Rainfall

Relationship between the Tibetan Plateau Heating and East Asian Summer Monsoon Rainfall. 許晃雄 (Huang-Hsiung Hsu) 劉新 (Xin Liu) 台灣大學大氣科學系 (NTU) 洪志誠 (Chi-Cherng Hong) 台北市立師範學院自然科學教育系 (Taipei Municipal Teachers College) (1 st part: GRL, in press). Major rainfall pattern in EASM

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Relationship between the Tibetan Plateau Heating and East Asian Summer Monsoon Rainfall

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  1. Relationship between the Tibetan Plateau Heating and East Asian Summer Monsoon Rainfall 許晃雄(Huang-Hsiung Hsu) 劉新(Xin Liu) 台灣大學大氣科學系(NTU) 洪志誠(Chi-Cherng Hong) 台北市立師範學院自然科學教育系 (Taipei Municipal Teachers College) (1st part: GRL, in press)

  2. Major rainfall pattern in EASM • （1993，1994，2003） • Affecting Taiwan • （1993，1994，2003） • Mechanism： • SST：PJ pattern • correlation ~ 0.3 • Tibetan Plateau • forcing? • ? 澇（旱） 旱（澇）

  3. Heating index & 1st PC Correlation HTP(JJA) Vs. JJA Heaitng Correlation HTP(MAM) Vs. JJA Heaitng Heating index: vertically-integrated diabatic heating (above 3 Km)

  4. Rainfall Composites (strong - weak) 1st EOF (JJA precipitation)

  5. Vorticity Composites 200 hPa 500 hPa

  6. Patterns reproduced by SVD analysis

  7. Numerical experiments: Barotropic model Basic flow：200hPa zonal-mean zonal flow in JJA Forcing：divergence over theTibetan Plateau

  8. Basic flow: Climatological mean flow

  9. Simulation • Same forcing • Basic flow • (strong HTP) • – Basic flow • (weak HTP) Strong - Weak Observation

  10. Simulation 1993 (S) – 1994 (W) Observation

  11. strong weak wave guide zonal-mean U PV gradient 1993 1994 wave guide zonal-mean U PV gradient

  12. 1993 1994 [U] JJA HTP(S)-HTP(W) 1993 - 1994

  13. 1993 1994 JJA [] HTP(S)-HTP(W) 1993 - 1994

  14. Corr (Precip. EOF1, SST) JJA

  15. Corr.(TPH, Precip) Corr.(WNPSST, Precip) Part. Corr.(TPH, Precip|WNPSST) Part. Corr.(WNPSST, Precip|TPH)

  16. Indian Ocean Dipole SST(50~70E, 10S~10N) – SST(90~110E, 0~10S)

  17. Corr.(TPH, Precip) Corr.(Nino3.4, Precip) Part. Corr.(TPH, Precip|Nino3.4) Part. Corr.(TPH, Precip|TPH)

  18. JJA rainfall in Taiwan

  19. HTP(S) – HTP(W) [U] 1993-1994

  20. HTP(S) - HTP(W) [] 1993-1994

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