Kimpei Ichiyanagi (Kumamoto University/JAMSTEC) Kei Yoshimura (Scripps Institution of Oceanography, UCSD/JAMSTEC) Manabu D. Yamanaka (JAMSTEC/Kobe University),

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Kimpei Ichiyanagi (Kumamoto University/JAMSTEC) Kei Yoshimura (Scripps Institution of Oceanography, UCSD/JAMSTEC) Manabu D. Yamanaka (JAMSTEC/Kobe University), Jun Matsumoto (Tokyo Metropolitan University/JAMSTEC) Stable isotopes in precipitation at DaNang, Vietnam

protonneutron Isotopes in water H 2 16 O H 2 18 O δ 18 O (‰) HD 16 O δD (‰) Isotope compositions of Hydrogen and Oxygen H O 1 H ％ 16 O ％ 2 D ％ 17 O ％ 18 O ％ Delta-description for stable isotopes δ= (R sample / R reference －１ ) ×10 3 (‰ ） R sample : compositions of samples (D/H), ( 18 O / 16 O) R reference : compositions of V-SMOW What is stable isotopes of water?

Isotopic fractionation in precipitation processes precipitation δD = 8×δ 18 O δD( ‰ ) δ 18 O( ‰ ) 0 d-excess evaporation δD = 5×δ 18 O d-excess Independent on precipitation Depend on evaporation D-excess =δD － 8δ 18 O Remaining water vapor heavy light Precipitation heavy light Ocean (δ= 0 ‰) land evaporation heavy light

Global Network for Isotopes in Precipitation (GNIP)

JAMSTEC Network of Isotopes in Precipitation (daily, 3-hourly samplings)

Precipitation sampling

Figure 1. Monthly mean precipitation and δ 18 O weighted by the daily precipitation amount (upper panel) at DaNang from February to December Same as δ 18 O, but δD and d-excess values (lower panel). heavy light

Figure 2. Daily variability in precipitation and δ 18 O at DaNang from February to December heavy isotope period light isotope period

Figure 6. Daily variability of water origin contributions to the total column water simulated by CMA (upper panel) and of δ 18 O in precipitation simulated by ICM (lower panel) at DaNang for The IDO (red), SCS (yellow), PFO (blue), and LND (green) are the same color as Figure 5. Figure 5. Distribution of the water vapor origins. The monsoon Asia is divided into four regions: Indian Ocean (IDO), South China Sea (SCS), Pacific Ocean (PFO), and Land (LND). Different colors represent different origins.

Figure 3. Relationships between daily δD and δ 18 O in precipitation during whole period (left panel) and two periods (right panel). The results of river and lake water samples were also shown in the left panel. evaporation precipitation

Figure 4. Relationships between daily precipitation amount and δ 18 O values during whole period (left panel) and two periods (right panel). heavy isotope period light isotope period

Concluding Remarks Stable isotopes in precipitation were observed at DaNang in Vietnam from February to December Depend on the seasonal variability of stable isotope ratios, it can be divided into light isotope period (April to September) and heavy isotope period (October to March). Daily variability of water origin contributions to the total column water and of δ 18 O in precipitation at DaNang for 2006 were simulated by CMA and ICM, respectively. Simulated δ 18 O in precipitation by the ICM can be reproduced the seasonal variability well. The water contributions from the SCS was corresponded to the heavy isotope period, while the IDO contribution was corresponded to the light isotope period. It was suggested the isotopic depletion from May to September was caused by the rain-out effect from the IDO to DaNang.

Thank you!

Figure 2. Daily variability of δD and d-excess in precipitation at DaNang from February to December 2006.

Water & Isotope Budget Equation : Vertically accumulated Precipitable Water (W) = W t-1 + Q λ － Q Φ + E － P Isotope ratio of W (δw) = (δw*×W* － δp×P ) / W Rayleigh Equation : Isotope ratio of P (δp) = (δw* － δw×f ) / ( 1 － f ), Fractionation (f) = W / W* Isotope Circulation Model (by Yoshimura et al., 2003) ＮｏＦｒａｃｔｉｏｎａｔｉｏｎＰ， δ ｐＷ， δ ｗＥ， δ ｅＷ＊， δ ｗ＊Ｗ ´ ， δ ｗ´ｗ´ ＲａｙｌｅｉｇｈＥｑｕａｔｉｏｎＤｅｐｅｎｄｅｎｔｏｎｌａｎｄ／ｓｅａｔｙｐｅＱ λ Ｑ Φ ▽・▽・ δ ｗＱ → ＮｏＦｒａｃｔｉｏｎａｔｉｏｎＰ， δ ｐＷ， δ ｗＥ， δ ｅＷ＊， δ ｗ＊Ｗ ´ ， δ ｗ´ｗ´ ＲａｙｌｅｉｇｈＥｑｕａｔｉｏｎＤｅｐｅｎｄｅｎｔｏｎｌａｎｄ／ｓｅａｔｙｐｅＲｅｐｅａｔＱ λ Ｑ Φ ▽・▽・ δ ｗＱ → ▽・▽・ δ ｗＱ →

StationPeriod Annual δ 18 O amount effect (R 2 ) D-O relationship (R 2 ) BKK (0.30) δD=7.90*δ 18 O+8.86 (0.97) CHM (0.33) δD=7.61*δ 18 O+3.96 (0.95) PKT (0.31) δD=7.07*δ 18 O+3.93 (0.96) SSR (0.53) δD=6.90*δ 18 O － 1.64 (0.94) UBN (0.43) δD=7.46*δ 18 O+4.94 (0.98) NKI , ,8,9 PMI (no rain data) > 3 years < 3 years GNIP PKT SSRUBN CHM BKK PMI NKI