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长江流域降水稳定同位素的云下二次蒸发效应

孟玉川,  刘国东

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文章导航 > 水科学进展  > 2010 >  21(3): 327-334
孟玉川, 刘国东. 长江流域降水稳定同位素的云下二次蒸发效应[J]. 水科学进展, 2010, 21(3): 327-334.
引用本文: 孟玉川, 刘国东. 长江流域降水稳定同位素的云下二次蒸发效应[J]. 水科学进展, 2010, 21(3): 327-334.
shu
MENG Yu-chuan, LIU Guo-dong. Effect of below-cloud secondary evaporation on the stable isotopes in precipitation over the Yangtze River basin[J]. Advances in Water Science, 2010, 21(3): 327-334.
Citation: MENG Yu-chuan, LIU Guo-dong. Effect of below-cloud secondary evaporation on the stable isotopes in precipitation over the Yangtze River basin[J]. Advances in Water Science, 2010, 21(3): 327-334.
shu

长江流域降水稳定同位素的云下二次蒸发效应

  • 四川大学水力学与山区河流开发保护国家重点实验室, 水利水电学院, 四川, 成都, 610065

基金项目: 国家自然科学基金重点资助项目(40730634)
详细信息
    作者简介:

    孟玉川(1975- ),男,四川成都人,讲师,博士研究生,主要从事水文水资源、同位素水文学方面研究.E-mail:mengyuchuan@126.com

  • 中图分类号: P426.61;P339

Effect of below-cloud secondary evaporation on the stable isotopes in precipitation over the Yangtze River basin

  • State Key Lab of Hydraulics and Mountain River Eng, College of Water Resource and Hydropower, Sichuan University, Chengdu 610065, China

Funds: The study is financially supported by the National Natural Science Foundation of China (No.40730634)

  • 摘要: 对长江流域443个GNIP的降水样品同位素原始资料,分降雪和降雨进行δ2H和δ18O线性回归,得到降雪样品的相关方程为δ2H=7.965δ18O+17.114,有最大的斜率和截距;而降雨样品根据降水量大小从<10mm至>300mm分为4组后,得到的相关方程随着降水量的减小,斜率和截距均减小,斜率从7.701减小为5.705,截距从7.812×10-3减小为-5.479×10-3。δ2H~δ18O相关方程的斜率及截距与气温、水汽压之间的关系表明,在降水从云层底部降落到地面的过程中,仅较小降雨事件有明显的二次蒸发现象,并伴随着同位素的分馏。长江流域较小降雨事件占有比例很小,仅为所有降水事件的6.32%,所以二次蒸发效应仅引起地区大气降水方程斜率和截距的微弱减小。研究表明,单个降水原始资料的同位素分析,能产生长期加权平均降水同位素分析得不到的宝贵信息。
    Abstract: Stable isotope compositions of hydrogen (δ2H) and oxygen (δ18O) for snow and rain were determined for a total of 443 GNIP (Global Network of Isotopes in Precipitation) samples collected from the Yangtze River basin.A correlation equation (δ2H=7.965δ18O+17.114) is obtained through linear regression between δ2H and δ18O values of snow samples.The maxmial slope and intercept values are shown in the snow equation.In contrast, correlation equations between δ2H and δ18O values for rain samples of four categories ranging from less than 10 mm to greater than 300 mm can result in prog ressively lower slope and intercept values with decreasing precipitation amount.The slope and intercept values in the four rain equations vary from 5.705 to 7.701 and -5.479‰ to 7.812‰, respectively.Analysis of the slope and intercept values of δ2H-δ18O correlation equations with amtospheric parameters such as temperature and water vapor pressure suggests that only the light rainfall events undergo secondary evaporation accompanied by isotope fractionation during raindrops descent from the cloud base to the ground.Since the light rainfall events can account for only 6.32% of the all precipitation events in the Yangtze River Basin Thus, the effect of below-cloud secondary evaporation on the stable isotopes in precipitation can only result in a slight decrease of slope and intercept values of the local meteoric water line.The study shows that the isotope analysis of individual precipitation samples can yields valuable information that cannot be obtained by the long-term weighted average samples.
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  • 收稿日期:  2009-05-07
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长江流域降水稳定同位素的云下二次蒸发效应

  • 四川大学水力学与山区河流开发保护国家重点实验室, 水利水电学院, 四川, 成都, 610065
    • 基金项目:  国家自然科学基金重点资助项目(40730634)
    作者简介:

    孟玉川(1975- ),男,四川成都人,讲师,博士研究生,主要从事水文水资源、同位素水文学方面研究.E-mail:mengyuchuan@126.com

  • 收稿日期: 2009-05-07
  • 刊出日期: 2010-05-25

  • 中图分类号: P426.61;P339

摘要: 对长江流域443个GNIP的降水样品同位素原始资料,分降雪和降雨进行δ2H和δ18O线性回归,得到降雪样品的相关方程为δ2H=7.965δ18O+17.114,有最大的斜率和截距;而降雨样品根据降水量大小从<10mm至>300mm分为4组后,得到的相关方程随着降水量的减小,斜率和截距均减小,斜率从7.701减小为5.705,截距从7.812×10-3减小为-5.479×10-3。δ2H~δ18O相关方程的斜率及截距与气温、水汽压之间的关系表明,在降水从云层底部降落到地面的过程中,仅较小降雨事件有明显的二次蒸发现象,并伴随着同位素的分馏。长江流域较小降雨事件占有比例很小,仅为所有降水事件的6.32%,所以二次蒸发效应仅引起地区大气降水方程斜率和截距的微弱减小。研究表明,单个降水原始资料的同位素分析,能产生长期加权平均降水同位素分析得不到的宝贵信息。

English Abstract

孟玉川, 刘国东. 长江流域降水稳定同位素的云下二次蒸发效应[J]. 水科学进展, 2010, 21(3): 327-334.
引用本文: 孟玉川, 刘国东. 长江流域降水稳定同位素的云下二次蒸发效应[J]. 水科学进展, 2010, 21(3): 327-334.
shu
MENG Yu-chuan, LIU Guo-dong. Effect of below-cloud secondary evaporation on the stable isotopes in precipitation over the Yangtze River basin[J]. Advances in Water Science, 2010, 21(3): 327-334.
Citation: MENG Yu-chuan, LIU Guo-dong. Effect of below-cloud secondary evaporation on the stable isotopes in precipitation over the Yangtze River basin[J]. Advances in Water Science, 2010, 21(3): 327-334.
shu

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