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冰川冻土 ›› 2020, Vol. 42 ›› Issue (3): 937-951.doi: 10.7522/j.issn.1000-0240.2020.0068

• 冰冻圈水文与水资源 • 上一篇    下一篇

黑河上游降水同位素特征及其水汽来源分析

孟鸿飞1,2(), 张明军1(), 王圣杰1,3, 邱雪1, 周苏娥1, 张亚宁1, 余秀秀1, 王雯4   

  1. 1.西北师范大学 地理与环境科学学院,甘肃 兰州 730070
    2.中国科学院 西北生态环境资源研究院,甘肃 兰州 730000
    3.陕西省 河流湿地生态与环境重点实验室,陕西 渭南 714099
    4.北京师范大学 防沙治沙教育部工程研究中心,北京 100875
  • 收稿日期:2019-01-30 修回日期:2020-07-02 出版日期:2020-10-31 发布日期:2020-12-08
  • 通讯作者: 张明军 E-mail:mhf824061@163.com;mjzhang2004@163.com
  • 作者简介:孟鸿飞(1993 - ), 男, 甘肃宁县人, 2016年在兰州城市学院获学士学位, 现为西北师范大学在读硕士研究生, 从事全球变化与可持续发展研究. E-mail:mhf824061@163.com
  • 基金资助:
    国家自然科学基金项目(41461003);甘肃省高等学校科研项目(2018C-02)

Precipitation isotope characteristics and water vapor source analysis in the upper reaches of the Heihe River

Hongfei MENG1,2(), Mingjun ZHANG1(), Shengjie WANG1,3, Xue QIU1, Su’e ZHOU1, Yaning ZHANG1, Xiuxiu YU1, Wen WANG4   

  1. 1.College of Geography and Environmental Science,Northwest Normal University,Lanzhou 730070,China
    2.Northwest Institute of Eco-Environment and Resources,Chinese Academy of Sciences,Lanzhou 730000,China
    3.Key Laboratory for Ecology and Environment of River Wetlands in Shaanxi Province,Weinan 714099,Shaanxi,China
    4.MOE Engineering Center of Desertification and Blown-sand Control,Beijing Normal University,Beijing 100875,China
  • Received:2019-01-30 Revised:2020-07-02 Online:2020-10-31 Published:2020-12-08
  • Contact: Mingjun ZHANG E-mail:mhf824061@163.com;mjzhang2004@163.com

摘要:

为了加深对黑河上游水循环过程的理解, 以研究区5个站点2015年8月至2016年8月的降水同位素实测数据和气象数据为基础, 除对降水同位素特征进行分析外, 主要利用TrajStat软件中的后向轨迹计算模块与潜在源贡献因子分析(PSCF)方法, 对研究区降水的水汽来源进行了分析, 并结合水汽通量等方法进行了补充分析。结果表明: 降水同位素呈夏高冬低趋势, 大气水线斜率(8.02)和截距(11.02)均高于全球大气水线的斜率(8.00)和截距(10.00), 存在温度效应(δ18O=0.43x-10.82, r=0.54, P<0.0001), 不存在降水量效应(δ18O=-0.05x-7.81, r=0.03, P<0.0001); 研究区降水受多种水汽影响, 西风水汽影响最大。夏季除受西风水汽影响外, 还受东南季风水汽影响显著且水汽来源复杂; 研究区夏季的潜在蒸发源地集中在一些相对湿度和蒸发量较大的地区, 如祁连山区、 河西地区、 柴达木盆地北部、 青藏高原东南部及酒泉地区西南部等; 当降水量小、 温度高时, 持续性降水的大气水线方程的斜率和截距较小, 暴雨稳定同位素值较贫化, 受东南季风水汽影响最大, 其次是北方和西风水汽, 多种水汽辐合是暴雨事件发生的必要条件。

关键词: 黑河上游, 降水同位素, 水汽来源, 潜在蒸发源地, 典型降水事件

Abstract:

In order to deepen the understanding of the process of water circulation in the upper reaches of Heihe River, based on the measured data of precipitation isotopes and meteorological data from 5 sites in the study area from August 2015 to August 2016, in addition to the analysis of precipitation isotope characteristics, TrajStat software is mainly used. The backward trajectory calculation module and the potential source contribution function analysis (PSCF) method focus on the analysis of the water vapor source of the precipitation in the study area, and supplement the analysis with the method of water vapor flux. The results show that: (1) The precipitation isotope is obviously low in summer and high in winter, and the slope (8.02) and intercept (11.02) of the meteoric water line in the study area are higher than the slope (8) and intercept (10) of the global atmospheric waterline. There is a temperature effect (δ18O=0.43x-10.82, r=0.54, P<0.0001), there is no precipitation effect (δ18O=-0.05x-7.81, r=0.03, P<0.0001); (2) Precipitation in the study area is affected by many kinds of water vapor, and the west wind water vapor has the greatest influence. In summer, except the west wind water vapor, the southeast water vapor has obvious influence and the source of water vapor is complicated; (3) The potential evaporation sources in the study area are mainly concentrated in some areas with large evaporation and relatively high humidity, such as: Qilian Mountains, Hexi area, northern part of the Qaidam Basin, the southeastern part of the plateau and the southwestern part of the Jiuquan area are the main potential evaporation sources for summer precipitation in the study area; (4) When precipitation is small and temperature is high, the slope and intercept of atmospheric water line equation of continuous precipitation are small. The stable isotope value of rainstorm is relatively depleted, which is most affected by water vapor of southeast monsoon, followed by water vapor of north and west wind, a variety of water vapor convergence is a necessary condition for the occurrence of heavy rain events.

Key words: the upper reaches of Heihe River, precipitation isotope, water vapor source, potential evaporation source, typical precipitation event

中图分类号: 

  • P426.6