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冰川冻土 ›› 2014, Vol. 36 ›› Issue (5): 1058-1068.doi: 10.7522/j.issn.1000-0240.2014.0128

• 冰冻圈与全球变化 • 上一篇    下一篇

利用稳定同位素大气水平衡模式模拟降水中δ18O的分布

章新平1, 关华德1,2, 张新主1, 吴华武1, 李广1, 黄一民1   

  1. 1. 湖南师范大学 资源与环境科学学院, 湖南 长沙 410081;
    2. School of the Environment, Flinders University, Adelaide 5001, Australia
  • 收稿日期:2014-02-06 修回日期:2014-06-18 出版日期:2014-10-25 发布日期:2014-11-19
  • 作者简介:章新平(1956-), 男, 湖南长沙人, 教授, 1993年在中国科学院兰州冰川冻土研究所获博士学位, 现主要从事气候变化的研究. E-mail:zxp@hunnu.edu.cn
  • 基金资助:

    国家自然科学基金项目(41171035;41271095);湖南省重点学科建设项目(2011001);湖南省百人计划项目(2010004)资助

Simulations of δ18O in precipitation using isotopic atmospheric water balance model

ZHANG Xinping1, GUAN Huade1,2, ZHANG Xinzhu1, WU Huawu1, LI Guang1, HUANG Yimin1   

  1. 1. College of Resources and Environmental Sciences, Hunan Normal University, Changsha 410081, China;
    2. School of the Environment, Flinders University, Adelaide 5001, Australia
  • Received:2014-02-06 Revised:2014-06-18 Online:2014-10-25 Published:2014-11-19

摘要:

利用稳定同位素大气水平衡模式, 模拟了2012年全球大气水汽和降水中δ18O的空间分布和时间变化以及降水中δ18O与降水量、温度之间的关系. 其目的在于检验稳定同位素大气水平衡模式模拟水稳定同位素循环的能力, 揭示稳定同位素效应产生的主要原因, 改善对水循环中稳定同位素效应的理解和认识. 模拟结果很好地再现了全球降水中δ18O的纬度效应、大陆效应和季节差异. 在水循环过程中, 引起降水中稳定同位素空间变化和时间变化的原因与蒸发对水汽同位素的富集作用、降水对水汽同位素的贫化作用、凝结温度对水汽同位素贫化程度的影响有关. 模拟的降水量效应主要出现在中低纬度海洋和季风区, 这种分布形势与δ18O季节差和降水量季节差的分布相对应; 模拟的温度效应主要出现在中高纬度陆地, 这种分布形势与降水中δ18O季节差的分布形势相对应. 在一些低纬度地区, 伴随强降水量效应的出现, 温度效应也同时出现.

关键词: 稳定同位素, 大气, 水平衡, 模拟, 分馏

Abstract:

Using the isotope Atmospheric Water Balance Model (iAWBM), the spatial distribution and the temporal variations of δ18O in atmospheric vapor and in precipitation, and the correlations between δ18O in precipitation and precipitation amount and temperature in 2012 are simulated, in order to examine the capability of iAWBM simulating the water isotope cycle, to deal with the main causes of isotope effects and to improve the understanding of isotope effects in the water cycle. The simulated results reproduce well the latitude effect, continent effect and seasonality of δ18O in global precipitation. In the water cycle, the causes of producing the spatial and temporal variations of stable isotopes in precipitation are related to the isotopic enrichment in vapor due to evaporation, the isotopic depletion in vapor due to precipitation and isotopic depleted degree in vapor due to condensation temperature. The simulated precipitation amount effect, corresponding to the distributions of the seasonality of δ18O in precipitation and precipitation amount, occurs mainly in low-mid latitude oceans and monsoon areas. The simulated temperature effect, corresponding to the distribution of the seasonality of δ18O in precipitation, occurs mainly in mid-high-latitudes continents. However, along with strong amount effect, temperature effect also occurs in some low-latitude areas.

Key words: stable isotope, atmosphere, water balance, simulation, fractionation

中图分类号: 

  • P426.61+2