Tanoue Masahiro, Ichiyanagi Kimpei, Yoshimura Kei
a School of Engineering , The University of Tokyo , Tokyo , Japan.
b Graduate School of Science and Technology , Kumamoto University , Kumamoto , Japan.
Isotopes Environ Health Stud. 2016 Aug-Oct;52(4-5):329-42. doi: 10.1080/10256016.2016.1148695. Epub 2016 Mar 17.
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.
利用水平分辨率分别为10公里、30公里和50公里的区域同位素环流模型模拟了2013年日本降水的同位素组成（δ(18)O和δ(2)H），并与日本56个站点的观测结果进行了比较。除1月外，所有模拟均在日本降水的δ(18)O中产生了合理的时空变化。1月，日本太平洋一侧降水的模拟δ(18)O值高于观测值，特别是在一次爆发性发展的温带气旋事件期间。这导致了对流层低层降水形成中关于大量降水液态水与夹卷液态水比例的参数化。结果，从日本海输送来的大部分水汽在日本海一侧降落。降水的同位素组成是区域同位素环流模型中降水形成参数化以及大规模水汽输送过程的有用验证工具。
