自然资源学报

自然资源学报 ›› 2013, Vol. 28 ›› Issue (11): 1945-1954.doi: 10.11849/zrzyxb.2013.11.011

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长沙大气降水中稳定同位素变化及过量氘指示水汽来源

黄一民1, 章新平1, 唐方雨2, 吴华武3, 张剑明4   

  1. 1. 湖南师范大学资源与环境科学学院, 长沙 410081;
    2. 湖南芷江师范学校, 湖南怀化 418000;
    3. 北京师范大学资源学院, 北京 100875;
    4. 株洲市气象局, 湖南株洲 412000
  • 收稿日期:2012-09-24 修回日期:2012-12-27 出版日期:2013-11-20 发布日期:2013-11-20
  • 作者简介:黄一民(1980-),男,湖南汨罗人,博士研究生,主要从事全球气候变化研究。E-mail:hymin2007@gmail.com
  • 基金资助:
    国家自然科学基金项目(41171035);湖南省重点学科建设项目(2011001);中国科学院青藏高原环境变化与地表过程重点实验室开放基金项目(2011004);湖南省研究生创新项目基金(CX2011B191)。

Variations of Precipitation Stable Isotope and Vapor Origins Revealed by Deuterium Excess in Changsha

HUANG Yi-min1, ZHANG Xin-ping1, TANG Fang-yu2, WU Hua-wu3, ZHANG Jian-ming4   

  1. 1. College of Resource and Environment Science, Hunan Normal University, Changsha 410081, China;
    2. Zhijiang Normal College, Huaihua 418008, China;
    3. College of Resources Science and Technology, Beijing Normal University, Beijing 100875, China;
    4. Zhuzhou Bureau of Meteorology, Zhuzhou 411000, China
  • Received:2012-09-24 Revised:2012-12-27 Online:2013-11-20 Published:2013-11-20
  • Contact: 章新平(1956-),男,湖南长沙市人,博士,教授,主要从事气候变化和降水稳定同位素的研究。E-mail:zxp@hunnu.edu.cn E-mail:zxp@hunnu.edu.cn

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摘要： 基于2010 年1 月1 日至2012 年5 月31 日长沙日降水同位素资料,对长沙降水中稳定同位素、过量氘(记为d) 的变化特征以及它们与降水、温度和湿度的关系进行了分析。研究发现:①在季风系统下, 降水中稳定同位素、d 均具有明显的季节变化,表现出夏半年的低值与冬半年的高值交替变化的特点;②降水中稳定同位素在不同时段均存在降水量效应和湿度效应,另外,夏半年中表现为反温度效应,冬半年则表现出温度效应;③综合考虑降水中d 和δ18O 与大气湿度的关系, 可认为影响长沙降水中稳定同位素变化的主要原因与降水的气团性质有关。夏半年中,夏季风盛行,降水的水汽主要来源于西南季风、东南季风所携带的海洋水汽,空气湿度大,d 小,重同位素在水汽输送过程中因不断冷凝而大大贫化,从而降水中δ18O(δD) 较小;冬半年中,长沙受大陆性气团控制,降水的水汽则主要来源于西风带及当地蒸发,空气湿度小,降水中δ18O(δD) 以及d 均较高。

关键词: 过量氘, 大气降水, 水汽来源, 稳定同位素, 长沙

Abstract: Variations of both stable isotope and deuterium excess (denoted as d) in precipitation as well as their relationship with precipitation, temperature and humidity were analyzed by using daily precipitation stable isotope data from January 1, 2010 to May 31, 2012. The results show that both stable isotopes and d in precipitation indicate obvious seasonal variation in the monsoon system, high value in the summer half year and low value in the winter half year. There are precipitation amout effect and humidity effect, in addition, anti-temperature effects in the summer half year and temperature effect in the winter half year. Considering both d and δD in precipitation with atmospheric humidity, we deduced that the main causation of stable isotopic variations in precipitation is related to the property of rainfall air mass. In the summer half year, the water vapor is transported by the southwest and southeast monsoon from low latitude oceans, with high humidity, low stable isotopic ratios and d owing to the rainout of vapor on the transport way. Then, in the winter half year, the vapor is primarily from the westerly transportation and the replenishment of reevaporated vapor in inland, with low humidity, high stable isotopic ratios and d values in precipitation.

Key words: stable isotope, vapor origins, Changsha, precipitation, deuterium excess

中图分类号: 

  • P426.6