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中国沙漠 ›› 2017, Vol. 37 ›› Issue (5): 997-1005.DOI: 10.7522/j.issn.1000-694X.2016.00139

• 天气与气候 • 上一篇    下一篇

祁连山排露沟流域降水δ18O和δD特征及水汽来源

冯芳1, 冯起2,3, 刘贤德3, 刘蔚2, 金爽2   

  1. 1. 江苏师范大学 地理测绘与城乡规划学院, 江苏 徐州 221116;
    2. 中国科学院寒区旱区环境与工程研究所, 甘肃 兰州 730000;
    3. 甘肃省祁连山水源涵养林研究院, 甘肃 张掖 734000
  • 收稿日期:2016-03-30 修回日期:2016-10-18 出版日期:2017-09-20 发布日期:2017-09-20
  • 作者简介:冯芳(1984-),女,湖北荆州人,助理研究员,主要从事高寒山区水化学和环境化学研究。E-mail:fengfangjs2006@163.com
  • 基金资助:
    国家自然科学基金青-基金项目(41501085);中国科学院内陆河流域生态水文重点试验室开放基金项目(KLEIRB-ZS-17-06);中国博士后科学基金项目(2013M532094)

Characteristics of δ18O and δD in Precipitation and Moisture Sources of Pailugou Catchment in the Qilian Mountains

Feng Fang1, Feng Qi2,3, Liu Xiande3, Liu Wei2, Jin Shuang2   

  1. 1. School of Geography, Geomatics and Planning, Jiangsu Normal University, Xuzhou 221116, China;
    2. Cold and Arid Region Environment and Engineering Research Institute, Chinese Academy Sciences, Lanzhou 730000, China;
    3. Institute of Water Resources Conservation Forests in the Qilian Mountains, Zhangye 734000, Gansu, China
  • Received:2016-03-30 Revised:2016-10-18 Online:2017-09-20 Published:2017-09-20

摘要: 降水氢氧同位素受气温、降水量、海拔、水汽来源等多种因素控制,是研究区域水文循环过程的重要手段。基于祁连山中段排露沟流域3个站点降水稳定氢氧同位素数据(δ18O、δD、d-excess)和气象观测资料,结合临近GNIP站点监测资料和HYSPLIT 4.9模型对流域降水同位素特征及水汽来源进行分析。结果表明:流域降水δ18O值波动范围大(-32.32‰~+3.23‰),季节性变化明显,冬季δ18O值较低,夏季δ18O值较高。降水δ18O和δD值与日均气温均存在密切正相关关系,即温度效应明显。受山区气候和地理条件影响,各站点局地大气降水线(LMWL)截距和斜率相似;与临近GNIP站点(张掖)进行对比,流域降水明显受局地水汽和二次蒸发影响较少。降水d-excess值表现出与δ18O值相反的季节性变化趋势。结合HYSPLIT 4.9气团轨迹模型,得出流域夏季水汽主要来源西风环流输送,冬季受西风环流和极地气团共同影响。

关键词: 排露沟流域, 降水, 氢氧同位素, 大气降水线, 水汽来源

Abstract: Hydrogen and oxygen isotopic composition of precipitation affected by a variety of factors, such as temperature, precipitation amount, altitude, vapor source and others, is the important tool for investigating the regional hydrologic cycle. The variations of δD and δ18O values in every rain and snow samples at three stations along the Pailugou catchment from November 2012 to December 2013 were presented in this syudy. The hydrogen and oxygen isotopes in individual precipitation events exhibited extensive variation. The δ18O varied from +32.32‰ to +3.23‰, while the δD values ranged from -254.46‰ to +12.11‰. Results showed that the δ18O displayed a distinct seasonal variation, with enriched values occurred in summer and relatively depleted in winter. There was a statistically significant positive correlation between the δ18O and δD values and local surface air temperature at all the three stations, which was valuable for regional quantitative temperature reconstruction. The Local Meteoric Water Llines (LMWLs) for three stations had similar intercepts and slopes, which reflected the regional climate feature. The nearest Global Network of Isotopes in Precipitation (GNIP) station (Zhangye), compared to the LMWLs for the Pailugou catchment, showed the obvious recycled moisture and secondary evaporation effects with lower intercept and slope. Additionally, the d-excess parameter in precipitation exhibited an anti-phase seasonal variability with the δ18O. The 96-hr back trajectories for each precipitation event using the HYSPLIT model indicated a dominant effect of westerly air masses in summer and the integrated influence of westerly and polar air masses in winter.

Key words: Pailugou catchment, precipitation, oxygen and hydrogen isotopes, meteoric water line, moisture source

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