| 祁连山北坡中段降水稳定同位素特征及水汽来源分析 |
| 摘要点击 1823 全文点击 675 投稿时间：2019-05-28 修订日期：2019-07-08 |
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| 中文关键词 祁连山北坡 大气降水 稳定同位素 水汽来源 影响因素 |
| 英文关键词 Northern slope of Qilian Mountains precipitation stable isotopes vapour sources of precipitation influence factors |
| 作者 | 单位 | E-mail | | 张百娟 | 兰州理工大学能源与动力工程学院, 兰州 730000
中国科学院西北生态环境资源研究院(筹), 内陆河流域生态水文重点实验室, 甘肃省水文水资源工程技术中心, 兰州 730000 | 18394487949@163.com | | 李宗省 | 中国科学院西北生态环境资源研究院(筹), 内陆河流域生态水文重点实验室, 甘肃省水文水资源工程技术中心, 兰州 730000 | lizxhhs@163.com | | 王昱 | 兰州理工大学能源与动力工程学院, 兰州 730000 | | | 李永格 | 中国科学院西北生态环境资源研究院(筹), 内陆河流域生态水文重点实验室, 甘肃省水文水资源工程技术中心, 兰州 730000 | | | 吕越敏 | 中国科学院西北生态环境资源研究院(筹), 内陆河流域生态水文重点实验室, 甘肃省水文水资源工程技术中心, 兰州 730000 | | | 袁瑞丰 | 中国科学院西北生态环境资源研究院(筹), 内陆河流域生态水文重点实验室, 甘肃省水文水资源工程技术中心, 兰州 730000 | | | 桂娟 | 中国科学院西北生态环境资源研究院(筹), 内陆河流域生态水文重点实验室, 甘肃省水文水资源工程技术中心, 兰州 730000 | |
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| 中文摘要 |
| 依据祁连山北坡中段8个站点的降水样品，结合同期气象数据，从降水同位素特征、影响因素以及水汽来源等方面进行分析，结果表明：①研究区降水稳定同位素季节变化明显，表现为夏半年富集，冬半年贫化的特征；在空间尺度上δ18O值随海拔的升高而减小，年降水δ18O的海拔效应为-0.19‰/100 m；②各站点的局地大气降水线的斜率和截距表现为随海拔的增加而增加的趋势，表明2000 m以上的高海拔山区受到更强烈的局地再循环水汽的影响；③研究区降水中稳定同位素温度效应显著，δ18O的温度效应为0.64‰，且仅在夏季存在微弱的降水量效应；④研究区云下蒸发作用显著.在5、6、7和8月，研究区降水δ18O的平均雨滴蒸发率分别为23%、11%、12%和16%，云下蒸发富集率46%、27%、38%和32%；⑤在夏季连续降雨条件下，研究区降水的水汽来源主要为西风水汽，同时受到局地蒸发水汽的影响.本研究结果有助于进一步了解内陆河水文循环过程，为进一步开展干旱区同位素水文研究奠定基础. |
| 英文摘要 |
| This study is based on precipitation samples from eight sites at the northern slope of the Qilian Mountains, combined with meteorological factors over the same period. Precipitation isotope characteristics, influence factors and the vapor sources of precipitation were analyzed, and the results show that:① The stable isotopes of precipitation in the study area show obvious seasonal changes, which are characterized by enrichment in the summer half-year and depletion in the winter half-year. The spatial precipitation δ18O value shows a significant downward trend with increasing altitude, and the altitude effect of the annual precipitation δ18O is -0.19‰/100 m, respectively;② At all stations, the slope and intercept of local meteoric water lines show an increasing trend from low altitude to high altitude. The high-altitude mountains above 2000 m are affected by local water vapor recirculation;③ The temperature effect is more significant and the temperature effect of δ18O is 0.64‰, and there is only a weak precipitation effect in summer;④ The results indicate that sub-cloud evaporation has a great influence on the δ18O of precipitation; the average raindrop evaporation rate of δ18O is 23%, 11%, 12%, and 16%,and the δ18O composition has been enriched by 46%, 27%, 38%, and 32% in May, June, July, and August from cloud base to ground, respectively.⑤ Under the condition of continuous rainfall in summer, the vapor sources of precipitation mainly come from the west and are affected by local evaporation of water vapor. The study enhances knowledge of isotopic evolution of precipitation and provides a basis for further study of isotopic hydrology in arid regions. |
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