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δ18O值变化范围为一26．78‰～4．05‰,δD值变化范围为-200．95‰～36．89‰，均处于全球降水δ18O与6D值变化范围内。天气尺度下，腾冲地区降水中δ18O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δ18O值变化并不一定遵循“降水量效应”。利用EcMwF（Europe—anCentreforMedium—RangeWeatherForecasts）提供的TcwV（TotalColumnWaterVapour）再分析资料，发现TCwV与δ18O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=8．18δ18O＋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。
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 δ18O ranged from -26.78‰ to 4.05‰,and the rainfall of 3D 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 δ18O in precipitation with the precipitation amount and temperature,thus,it indicatated that the variations of δ18O 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 δ18O 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 δ18 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. 18δ18 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.
出处
《长江流域资源与环境》
CAS
CSSCI
CSCD
北大核心
2013年第11期1458-1465,共8页
Resources and Environment in the Yangtze Basin
基金
国家自然科学基金项目(40871094
41171035)
湖南省重点学科建设项目(2012001)
湖南省研究生科研创新项目基金(CX2013B223)
关键词
降水
稳定同位素
过量氘
大气降水线
腾冲
precipitation
stable isotope
d-excess
meteoric water line
Tengchong
作者简介
李广（1988-），男，湖南省长沙人，硕士研究生，主要从事气候变化及水文同位素方面的研究．E-mail：liguangda1988@163．com
通讯作者E-mail：zxp@hunnu．edu.cn.
