内蒙古中部夏季大气降水中同位素变化

doi:10.13866/j.azr.2017.06.02

摘要/Abstract

摘要： 摘要：大气降水中稳定同位素(δD、δ18O)含量变化及相互关系是分析大气降水过程潜在影响因素的重要指标之一。通过采集内蒙古中部地区呼和浩特市、锡林郭勒盟正蓝旗和赤峰市克什克腾旗达里诺尔湖等区域的夏季大气降水样品，进行了δD、δ18O值测试，同时结合包头市大气降水同位素测试结果，进行了区域大气降水变化特征对比分析，结果显示：① 内蒙古中部4个区域“大气水线”间存在明显差异，表明区域大气降水的水汽来源并不一致，同时叠加区域蒸发作用的影响，使得内蒙古中西部地区的包头市“大气水线”的斜率(5.84)和截距(-8.88)较低，而位于东南部的达里诺尔湖区域“大气水线”的斜率(8.26)和截距(7.21)较高，最接近全球或全国“大气水线”；② 内蒙古中部地区的大气降水同位素组成主要受到降水过程及区域强烈蒸发作用的影响。夏季不同月份大气降水中[WTBX]d值出现明显波动，显示不同月份大气降水同位素组成的主要影响因素存在差异：7月的大气降水量占夏季降水总量的比例最高，受季风降水影响作用最强烈，同时d值最低，说明降水过程对降水同位素组成的影响作用可能超过了蒸发作用的影响；6、9月降水量相对减少，而d[WTBZ]值相对较高，显示蒸发作用的影响较强。

关键词: 稳定同位素, 夏季, 降水, 大气水线, 内蒙古

Abstract: Abstract：Stable isotopes in precipitation,such as δD and δ18O,are two important indicators of analyzing water vapor sources and transport pathways in rainfall process. The values of δD and δ18O can be used to analyze the factors affecting precipitation. In this paper,the samples of summer rainfall in Hohhot,Zhenglan Banner of Xilin Gol League and Dali Nor Lake in Hexigten Banner of Chifeng City,Inner Mongolia were collected. Based on the values of δD and δ18O in precipitation in the study areas,the characteristics of summer precipitation in central Inner Mongolia were discussed in detail. The results are as follows: ① The meteoric water lines over central Inner Mongolia were significantly different,which showed that the water vapor sources were different. The slope and intercept of meteoric water line over Baotou City were both lower,and their values were 5.84 and -8.88 respectively. Correspondingly,the slope and intercept of meteoric water line over the Dali Nor Lake were both higher,and their values were 8.26 and 7.21 respectively,which was similar to the global or Chinese meteoric water line; ② The change of δD and δ18O was mainly affected by the process of rainfall and local evaporation. Meanwhile,the value of deuterium surplus parameter (d) was also different from different months in summer. As a whole,the precipitation intensity and local evaporation might be the main factors affecting the change of d value. The proportion of precipitation in July was higher than that in other three months in summer,which could lead to the lowest d value in July,and also showed that the precipitation intensity might have stronger influence on the change of d value than the local evaporation in July. The d value was high in June and September,which revealed that the local evaporation might have stronger influence on process of rainfall.

Key words: stable isotope, summer precipitation, meteoric water line, Inner Mongolia

李文宝，李畅游，贾德彬，郝世祺，刘志娇，蕊臻. 内蒙古中部夏季大气降水中同位素变化[J]. 干旱区研究, 2017, 34(6): 1214-1221.

LI Wenbao,LI Changyou,JIA Debin,HAO Shiqi,LIU Zhijiao,LI Ruizhen. Change of Stable Isotopes in Summer Precipitation in Central Inner Mongolia[J]. , 2017, 34(6): 1214-1221.

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