长江流域资源与环境 >> 2013, Vol. 22 >> Issue (02): 175-.

• 自然资源 • 上一篇    下一篇

大气降水中稳定同位素组成的高分辨率记录——以桂林地区为例

吴 夏 | 朱晓燕 | 张美良 | 白 晓 | 张碧云   

  1. (1.中国地质科学院岩溶地质研究所|国土资源部岩溶动力学重点实验室|广西 桂林 541004;
    2.广西区域地质调查研究院|广西 桂林 541004; 3.广西水文地质工程地质队|广西 柳州 545000)
  • 出版日期:2013-02-20

HIGHRESOLUTION STABLE ISOTOPE RECORD OF ATMOSPHERIC PRECIPITATION IN GUILIN

WU Xia1| ZHU Xiaoyan1| ZHANG Meiliang1| BAI Xiao2| ZHANG Biyun3   

  1. (1.Karst Dynamics Laboratory,Institute of Karst Geology,Chinese Academy of Geological Sciences,Guilin 541004,China; 2.Guangxi Institute of Regional Geological Survey|Guilin 541004,China; 3.Water Engineering Geological Party of Guangxi,Liuzhou 545000,China
  • Online:2013-02-20

摘要:

大气降水中δD、δ18O主要受到温度、纬度、高程、降雨量等多种环境因素影响。通过对桂林地区2010年大气降水进行δD、δ18O分析测试,获得δD的分布范围:2905‰~-9627‰;δ18O的分布范围:-02‰~-1296‰。研究结果表明桂林地区大气降水的δ18O与所受季风类型存在明显联系:由于夏季研究地区主要受到东亚(东南)夏季风影响,水汽团在运移过程中因强烈降水导致水汽中δD、δ18O连续被贫化,其结果是夏季降水的δD、δ18O普遍偏轻于冬季降水。通过建立该地区大气降水线方程:δD=887δ18O+1549,揭示出该区域温润多雨的气候特征。此外,过量氘(d=δD-8δ18O)在夏季和冬季呈现不同的变化特征指示了研究区夏季大气降水水汽源主要来源于低纬度海洋,而冬季大气降水水汽源主要为内陆或者局地蒸发和冬季风(西风带)的输送。该研究结果为解译石笋和洞穴滴水中所蕴含的环境信息提供有力的科学依据

Abstract:

This study investigated the factors controlling the δ18O composition of the precipitation in Guilin.Daily precipitation samples for stable isotope analysis were collected in Guilin during 2010.The stable isotope (δD and δ18O) in precipitation displayed obvious spatial and temporal variation,and thus could be used for providing:(1)the best natural tracer for studying the hydrological cycle;(2)the ambient temperature and amount at time of precipitation;(3)the ground surface elevation;(4)the distance between precipitation event and its water vapor source region in the ocean;(5)water vapor source migration pathway.Empirical relations between isotope of precipitation and climate were used in numerous studied aimed to reconstructing past climate from various environmental archives.δD and δ18O in atmospheric precipitation were tested and analyzed,and the results showed:the values of δD distribution ranged from 2905‰ to 9627‰;δ18O values distribution ranged from -02‰ to -1296‰.The tested result of stable isotope showed significantly seasonal variability.The research results indicated that there was a significant relationship between δ18O values and the types of monsoon winds.δ18O values of the researched area were mainly affected by summer monsoon of east and southeast area in summer.During the transportation of atmospheric precipitation,the δD and δ18O in vapor caused by intense precipitation became more negative.Thus,δD and δ18O values of precipitation in summer were more negative excursion than that in winter.The Local Meteoric Water Line:δD=887δ18O+1549 was established by using the relationship between δD and δ18O.This result reflected climate character of Guilin:the warm and rainy.In addition,Deuterium Excess (d=δD-8δ18O)presented different characters during summer and winter.At the same time,the equation showed that in the researched area,the vapor source of atmospheric precipitation were mainly from ocean of low latitude in summer,while in winter the vapor source of atmospheric precipitation were mainly from the evaparation of inland and part areas and the transportation of winter monsoon(westerlies).In 2010,the δ18O value of atmospheric precipitation in September was more negative than that in June.This result indicated summer monsoon was extremely strong in September.But the total precipitation in September was far less than that in June.The reason might be that summer wind was strong and caused atmospheric precipitation zone reached to monsoon marginal zone.All of this contributed to the relatively decrease of atmospheric precipitation in the researched area.This study provides significant information to understand presentday seasonality of precipitation and its isotopic composition in Guilin,and strong scientific basis for constructing environment temperature with the use of stalagmites and dripping water

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