长江流域资源与环境 >> 2013, Vol. 22 >> Issue (011): 1458-.

• 自然资源 • 上一篇    下一篇

云南腾冲地区大气降水中氢氧稳定同位素特征

李 广| 章新平| 张新主| 吴华武| 孙广禄| 黄一民   

  1. (1.湖南师范大学资源与环境科学学院|湖南 长沙 410081; 2.北京师范大学资源学院|北京 100875)
  • 出版日期:2013-11-20

STABLE HYDROGEN AND OXYGEN ISOTOPES CHARACTERISTICS OF ATMOSPHERIC PRECIPITATION FROM TENGCHONG,YUNNAN

LI Guang1| ZHANG Xinping1| ZHANG Xinzhu1| WU Huawu2| SUN Guanglu1|HUANG Yimin1   

  1. (1.College of Resources and Environment Sciences|Hunan Normal University|Changsha 410081|China;2.College of Resources Science and Technology|Beijing Normal University|Beijing 100875|China
  • Online:2013-11-20

摘要:

为了揭示腾冲地区降水中氢氧稳定同位素特征,利用2009年1月~2011年12月腾冲地区339个降水样品资料,对降水中的氢、氧同位素组成及其影响因素进行了分析和研究。结果表明:腾冲地区大气降水中δ18O值变化范围为-2678‰~405‰,δD值变化范围为-20095‰~3689‰,均处于全球降水δ18O与δD值变化范围内。天气尺度下,腾冲地区降水中δ18O的变化具有显著的降水量效应以及反温度效应。但是,在季风降水期间,如果相邻两天都有降水发生时,腾冲地区降水中δ18O值变化并不一定遵循“降水量效应”。利用ECMWF(European Centre for MediumRange Weather Forecasts)提供的TCWV(Total Column Water Vapour)再分析资料,发现TCWV与δ18O的日变化存在明显的反位相对应关系。腾冲地区的大气降水线为:δD=818δ18O+1172,斜率与截距均比全球和全国的大气降水线偏大,说明该地区气候湿润多雨。d值分布具有季节差异,在雨季(4~9月),腾冲地区降水的水汽主要来源于低纬度海洋,空气湿度大,降水中d值较小;在干季(10~3月),由于受大陆性气团控制,腾冲地区降水的水汽主要来源于西风带的输送以及局地再蒸发水汽的补充,空气湿度小,降水中d值较大

Abstract:

In order to reveal the characteristics of stable hydrogen and oxygen isotopes in precipitation of Tengchong region,based on the 339 precipitation samples in Tengchong region from Jan.2009 to Dec.2011, the compositions and influencing facters of hydrogen and oxygen isotope in precipitation were analyzed. The results indicated that the rainfall of δ18O ranged from -2678‰ to 405‰,and the rainfall of δD ranges from -20095‰ to 3689‰ in Tengchong,these date were comparable to the world range and the Chinese range.Under the synoptic timescales,the results showed that there was negative correlation of δ18O  in precipitation with the precipitation amount and temperature,thus,it indicatated that the variations of δ18O in precipitation had significant precipitation amount effects and antitemperature effects. However,during the monsoon,if the adjacent two days both had rainfall in Tengchong region, the vatiations of δ18O in precipitation would not necessarily adhere to the precipitation amount effects.In addition,based on the reanalysis date of the total column water vapour from the European Centre for MediumRange Weather Forecasts,it was found that the variations between the δ18O and the TCWV existed significant inverse phase. The reason was that they affected by the same circulation condition and vapour condition.The meteoric water line was fitted as δD=818δ18O+1172 in Tengchong,which the slope and intercept were bigger than the Globe Meteoric Water Line and Chinese Meteoric Water Line. It revealed that the climatic characteristics was humid and rainy in Tengchong region.At the same time,with the precipitation amount decreased,the slope and intercept values varied from 848 to 797 and 1628 to 935,respectively.d in precipitation had distinct seasonality.In the rainy season of Tengchong, in the vapour of generating precipitation with high humidity,low stable isotopic ratios was result from the rainout of vapour on the transport way,and small d in precipitation was primarily from low latitude oceans. However,in the dry season,in the vapour of generating precipitation with low humidity,great stable isotopic ratios and high d in precipitation were primarily from the westerly transportation and the replenishment of reevapourated vapour in inland.The study would provide sufficient evidence to understand the water cycle characteristics,the water vapour sources and the changes of the environment evolution and it would also promote the society,the economy and the environment sustainable coordinated development

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