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Analysis of hydrological cycle in atmosphere using hydrogen and oxygen stable isotope ratios

使用氢和氧稳定同位素比分析大气中的水文循环

基本信息

批准号：
13838008
负责人：
HIRATA Tatemasa
金额：
$ 1.79万
依托单位：
Wakayama University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2001
资助国家：
日本
起止时间：
2001 至 2003
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-13838008/
关键词：
oxygen isotope hydrogen isotope rainfall system Kii peninsula rain water stream water water vapor isotope fractionation 水循環システム水素同位体比酸素同位体比蒸発速度

项目摘要

We measured oxygen stable isotope ratios (δ ^<18>O) of surface water in Kii Peninsula, and showed their spatial distribution. As a result, the enriched δ ^<18>O composition of surface waters were distributed in the southeast area and the depleted δ ^<18>O composition of surface waters were distributed in the inland area where the altitude was high (>1000 m). In order to understand the spatial distribution of δ ^<18>O composition of surface water, rainfall characteristics were considered as well as topographic effect. We classified the rainfall characteristics with three zones using a ratio of the total number that means how many times precipitation was simultaneously observed between AMeDAS observation stations: 1)the east and southeast area (zone A), 2)the southwest area (zone B), 3)the northwest area (zone C). From the correlation analysis between δ ^<18>O and topographic data, we can find that the zoning effects on the topographic effect, especially in a meso-scale area. Our observation result shows that the δ ^<18>O composition of surface water was enriched in high precipitation area. This result does not correspond to the isotopic amount effect. We think this reasons that continuous vapor supply from the sea keeps δ ^<18>O composition of rain clouds enriched.

通过对纪伊半岛表层水氧稳定同位素比值（δ ^<18>O）的测定，揭示了其空间分布特征。结果表明，表层沃茨δ ^<18>O组成富集区主要分布在东南部，表层沃茨δ ^<18>O组成亏损区主要分布在海拔较高（>1000 m）的内陆地区。为了了解地表水δ ^ O组成的空间分布<18>，考虑了降雨特征和地形效应。我们使用AMeDAS观测站之间同时观测到降水的总次数的比率将降水特征分为三个区域：1）东部和东南部区域（A区），2）西南部区域（B区），3）西北部区域（C区）。通过δ ^ O与地形数据的相关性分析<18>，可以发现地形效应受分带效应的影响，尤其是在中尺度区域。观测结果表明，<18>高降水区地表水δ ^ O组分富集。这一结果不符合同位素量效应。我们认为，这是由于来自海洋的持续水汽供应使雨云的δ ^<18>O成分不断富集的原因。