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| 基于同位素证据的夏季风水汽影响区域分界 |
| Identification of Interaction Region Influenced by Different Summer Monsoons Base on Isotope Evidence of Hydrogen and Oxygen |
| 投稿时间：2016-11-15 修订日期：2017-02-21 |
| DOI：10.14050/j.cnki.1672-9250.2017.05.003 |
| 中文关键词: 氢氧同位素;西南水汽;东南水汽;水汽来源;大气降水;稳定同位素技术 |
| 英文关键词: hydrogen and oxygen isotopes;southwest moisture;south sea moisture;water vapor origin;atmospheric precipitation;stable isotopic technique |
| 基金项目:国家自然科学基金项目(41371105);河南省博士后基金 |
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| 中文摘要: |
| 以影响我国大陆干湿状况的孟加拉湾和南海两股水汽的疑似交界影响区域之一的云南省、广西壮族自治区为研究区,借助稳定性同位素质谱仪MAT253测定2014年16个点、239个有效样本的雨季大气降水的氢氧稳定同位素组成,完成了基于GIS平台的δD、δ18O空间格局分析,实现了中国夏季风西南水汽和东南水汽的交互区域界定。主要研究结果有三点:(1)2014年雨季及6月中下旬一次降水过程δD和δ18O空间变化格局基本一致,因为夏季风大气降水δD和δ18O均沿水汽输送路径不断衰减;(2)大气降水氢氧稳定同位素空间分布主要受降雨量效应和大陆效应的影响,哀牢山高大地形阻隔及云南高原正地形水汽截留作用可能是其数值发生突变的主要原因;(3)2014年夏季的西南水汽在越过哀牢山后与东南水汽在红河、个旧、蒙自附近交互影响使δD和δ18O发生显著变化,6月中下旬一次降水过程中的氢氧同位素数值在红河、个旧附近达到最低,两者互为验证红河、个旧应该是西南水汽和东南水汽影响区域分界。 |
| 英文摘要: |
| In this study the interaction region influenced possibly by both Southwest Moisture and South Sea Moisture is the research target, by means of stable isotope ratio mass spectrometer MAT253, hydrogen and oxygen stable isotopes of 239 effective samples in 16 samples atmospheric precipitation in the region between 23°~24°N from Yunnan and Guangxi Provinces during April to October 2014 were analyzed. Spatial pattern study on δD and δ18O based on ArcGIS13.0 software by trend analysis were referenced, and boundaries between the moisture from Southwest and the moisture from South Sea were demarcated. There are three main results from this study. First of all, spatial patterns of both δD and δ18O are consistent basically both in the whole rainy season precipitation and a precipitation course during the middle ten days and the last ten days of June, because both δD and δ18O of the atmospheric precipitation are diminishing along the water vapor transmission path. Secondly, both rainfall factor and continental factor have affected the spatial pattern of hydrogen and oxygen stable isotopes in atmospheric precipitation of the study area, but the barrier of huge mountains may be its main cause of value mutating, such as the Ailao Mountain and the Wuliang Mountain. Thirdly, after crossing the Ailao Mountain, the southwest vapor met the South Sea vapor near Honghe, Gejiu and Mengzi both in the whole rainy season precipitation and a precipitation course during the middle ten days and the last ten days of June, so the area near Honghe, Gejiu and Mengzi is probably the region with Southwest vapor and South Sea vapor interaction. |
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