摘要
以GNIP为数据源,选取研究了黄土高原区7个站点(兰州、银川、靖边、西安、平凉、包头、太原)降水中稳定同位素的时空变化特征,分析了除靖边站之外的其他站点降水同位素与温度和降水量的关系,揭示了该地区降水中稳定同位素的变化规律。结果表明:(1)黄土高原大气降水稳定同位素在不同的区域有着相似的时间变化特征和不同的空间变化特征;(2)建立了黄土高原区域大气降水线方程δD=7.0δ18O+0.36‰;(3)黄土高原各站点降水同位素的温度效应和雨量效应表现出较为显著的空间特性;(4)黄土高原区在冬季风期间较夏季风期间风速大、湿度低且蒸发强烈。
Based on the data of GNIP, we investigat ed the temporal and spacial variation characteristics of stable isotope of 7 stations(Lanzhou,Yinchuan,Jingbian,Xi'an,Pingliang,Baotou,Taiyuan)in Loess Plateu,except for Jingbian,and analyzed the correlation between the precipitation isotopic content and temperature,as well as precipitation,so as to reveal the regularity of the stable isotope related. The results show that:(1) the stable isotopes of precipitation in the Loess Plateau has a similar temporal change characteristics in different regions, and different spatial change characteristics;(2) the Local Meteoric Water Line: δD =7.0δ18 O +0.36‰ was established for the Loess Plateau;(3)there are significant spatial characteristics of the temperature and rainfall effect at the stations in the Loess Plateau;(4) there higher wind speed, lower humidity and stronger evaporation in winter than those in summer in the Loess Plateau.
引文
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