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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

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.
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.

长江流域降水稳定同位素的云下二次蒸发效应

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

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。
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出版历程
  • 收稿日期:  2009-05-07
  • 刊出日期:  2010-05-25

长江流域降水稳定同位素的云下二次蒸发效应

    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

  • 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.
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.
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