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Global circulation of water and its stable isotopes

Global circulation of water and its stable isotopes. Kei Yoshimura IIS, Univ.of Tokyo. Stable Water Isotopes. O: 16 O, 17 O, 18 O H: 1 H, 2 H(D), 3 H(T). H 2 18 O. H. Iso.var. 18 O. H. 0.20 ％. H. <. iso.var. 16 O. H. HDO. H 2 O. 16 O. D. 0.015 ％. H. Water Isotopes.

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Global circulation of water and its stable isotopes

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  1. Global circulation of water and its stable isotopes Kei YoshimuraIIS, Univ.of Tokyo

  2. Stable Water Isotopes O: 16O, 17O, 18OH: 1H, 2H(D), 3H(T) H218O H Iso.var. 18O H 0.20％ H < iso.var. 16O H HDO H2O 16O D 0.015％ H Water Isotopes iso.var. (‘Light’ Water)Easy to evaporate (‘Heavy’ Water)Easy to condense River flow

  3. Int’l Collaboration on Water Isotopes

  4. Join (A)NIP!!! (expanded from GAME-T network)(Asian) Network of Isotopes in Precipitation 150 rainy days * 10 stations = 1,500 (daily samples / year)

  5. Observations • Large spatio-tepmporal variability dependent on Atmospheric hydrologic cycle. Global Network of Isotopes in Precipitation (GNIP) by IAEA Daily Precip. Iso. In Thailand

  6. Rayleigh-type Isotope Circulation Model (ICM)(Yoshimura et al., 2003, JGR) • Global 1.25x1.25 (144x72) 2-D grid-box model. • Forced by external meteorological dataset (P,E,Q,W). • Upstream scheme • Rayleigh FractionationIntegrate vertical in-cloud micro processes So-called “Offline Simulation” of Isotope Atmospheric circulation.Any global datasets can be forced.

  7. Model agrees observations Yoshimura et al., 2003, JGR

  8. Global Water Sources Colored Moisture Analysis (1998)In Yoshimura et al., 2004, JMSJ

  9. May 17 Sep. 20 Sudden Increase of Indian O. Decrease of Indian O. Source of precipitation in Bangkok Land Indian O. Pacific B.of Bengal Arabic S. Andaman Other Initial Onset Withdrawal

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