石家庄地区大气降水氢氧同位素特征分析

摘要

研究大气降水中氢氧同位素的特征能够揭示水循环规律.依据全球氢氧稳定同位素监测网(GNIP)提供的大气降水稳定同位素资料,选择石家庄地区1985-2003年的资料数据,结合气象资料和水汽来源,分析了石家庄地区大气降水氢氧同位素的特征及变化规律,并建立了局地大气降水线方程.结果表明:石家庄地区大气降水的18O春季最为富集,冬季最为贫化,夏秋两季相近;局地大气降水线方程为δD=6.39δ18O-3.75,斜率和截距明显小于全球和中国大气降水线方程,反映该地区偏干旱的气候特征;年尺度上,石家庄地区大气降水δ18O和δD具有一定的温度效应,但降雨量效应极为微弱,只在春夏季较为显著,表明该地区降水同位素受温度的影响作用更大.%The study on characteristics of hydrogen and oxygen isotopes in precipitation can reveal the regularity of water cycle.Based on the GNIP data,choosing the data of Shijiazhuang area from 1985 to 2003,combined with the meteorological data and the source of water,the characteristics and change regularity of atmospheric precipitation hydrogen and oxygen isotopes were analyzed and the local meteoric water line was established.The results showed that the 18O value of precipitation was the highest in spring,the lowest in winter,and the values in summer and autumn were close.The equation of local meteoric water line was δD =6.39δ18O-3.75.The smaller slope and intercept compared with the global and national atmospheric precipitation reflected its arid climate characteristics.The δ18O and δD of atmospheric precipitation in study area had certain temperature effect,but the precipitation effect was very weak,which was only significant in spring and summer.It indicated that temperature had more effects on precipitation isotopes in this area.