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黄河小浪底库区降水δD和δ~(18)O季节变化特征及水汽来源分析
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摘要
根据2011~2014年4—10月在位于我国东部季风区的黄河小浪底库区收集降水样品及相应气象资料,分析该地区大气降水的δD和δ~(18)O季节变化规律及影响因素,建立不同季节大气降水线,揭示该地区不同季节水汽来源差异.结果表明,降水的δD和δ~(18)O值变化范围较大,具有明显的季节变化,春季降水的δD和δ~(18)O值较高,夏季次之,秋季最低.4一10月及秋季降水δD和δ~(18)O与降水量存在负相关关系,4—10月降水δD与温度成负相关关系,而季节性降水同位素与温度相关性不显著.夏季大气水线斜率及降水d值较小,而秋季最大.利用HYSPLIT气团轨迹模型,得出夏季水汽主要来自东南及西南海洋性季风输送,春秋季节降水受大陆和海洋性季风共同影响.
The seasonal characteristics of δD and δ~(18)O in precipitation and its influence factors were analyzed in the Xiaolangdi Reservoir area which located at the eastern monsoon region of China.The precipitation samples and the corresponding meteorological data were collected between April and October from the year 2011 to 2014.The Local Meteoric Water Line(LMWL) of different seasons were established,and water vapor source differences were revealed in different seasons.The results show that the δD and δ~(18)O in precipitation exhibited an extremely wide range and a distinct seasonal variation,and they were enriched in spring,and depleted in autumn.The δD and δ~(18)O values showed significant negative correlations with the precipitation from April to October and autumn,respectively.The δD values and the mean air temperature showed a significant negative correlation from April to October,but showed no significant correlation in seasons.Both the slope of the LMWL and d value of precipitation were the smallest in summer,and they were the biggest in autumn.The results of airmass back trajectories of seasonal precipitation with the HYSPLIT model indicate a dominant effect of southeast and southwest maritime monsoon air masses in summer and the co- influence of continental and oceanic monsoons air masses in spring and autumn in the study area.
引文
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