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The stable water isotopes (H2O, HDO) have been included into the CCSR/NIES Atmospheric General Circulation (AGCM) 5.4g. This model reproduced global scale distribution of δO in precipitation and the temperature effect roughly, but δO in precipitation in arid region and in cold region was overestimated and temperature effect was underestimated. Then in this study we conducted three sensitivity experiments focusing on isotope parameterizations and horizontal resolution. In the first experiment, to control the kinetic effect in re-evaporation of precipitation below cloud base, we used the effective relative humidity. As a result, δO in precipitation in arid region become lighter and similar to observation. In the second experiment, we focused on the treatment of ice crystals, but in this experiment, there is not strong sensitivity globally. In the third experiment, we used the high horizontal resolution with the effective relative humidity. In this experiment, in addition to arid region, δO in precipitation in cold region become lighter and similar to observation and temperature effect is also simulated more realistically.

CCSR/NIES 5.4g WATER ISOTOPE GENERAL CIRCULATION MODEL : SENSITIVITY EXPERIMENTS FOR IMPROVEMENT