title: Verification of the isotopic composition of precipitation simulated by a regional isotope circulation model over Japan.
abstract: The isotopic composition (δ(18)O and δ(2)H) of precipitation simulated by a regional isotope circulation model with a horizontal resolution of 10, 30 and 50 km was compared with observations at 56 sites over Japan in 2013. All simulations produced reasonable spatio-temporal variations in δ(18)O in precipitation over Japan, except in January. In January, simulated δ(18)O values in precipitation were higher than observed values on the Pacific side of Japan, especially during an explosively developing extratropical cyclone event. This caused a parameterisation of precipitation formulation about the large fraction of precipitated water to liquid detrained water in the lower troposphere. As a result, most water vapour that transported from the Sea of Japan precipitated on the Sea of Japan side. The isotopic composition of precipitation was a useful verification tool for the parameterisation of precipitation formulation as well as large-scale moisture transport processes in the regional isotope circulation model.
authors.affiliation: a School of Engineering , The University of Tokyo , Tokyo , Japan.
authors.forename: Masahiro
authors.initials: M
authors.lastname: Tanoue
authors.affiliation: b Graduate School of Science and Technology , Kumamoto University , Kumamoto , Japan.
authors.forename: Kimpei
authors.initials: K
authors.lastname: Ichiyanagi
authors.affiliation: c Atmosphere and Sea Research Institute and Institute of Industrial Science, The University of Tokyo , Tokyo , Japan.
authors.forename: Kei
authors.initials: K
authors.lastname: Yoshimura
mesh_terms: D003903:Deuterium / Q000032:analysis*; D004784:Environmental Monitoring; D007564:Japan; D008962:Models, Theoretical; D010103:Oxygen Isotopes / Q000032:analysis; D011891:Rain / Q000737:chemistry*; D015203:Reproducibility of Results; D012621:Seasons
chemical_list: D010103:Oxygen Isotopes; D003903:Deuterium
keywords: Isotope circulation model; Japan; isotope hydrology; oxygen-18; precipitation