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  

Seasonal characteristics of δD and δ^(18)O in precipitation and its water vapor sources in the Xiaolangdi Reservoir area of Yellow River,China

作　　者：田超[1,2] 孟平[1,2] 张劲松[1,2] 孙守家[1,2] 何春霞[1,2] 贾长荣 李建中 

机构地区：[1]中国林业科学研究院林业研究所国家林业局林木培育重点实验室,北京100091 [2]南京林业大学南方现代林业协同创新中心,南京210037 [3]济源市国有大沟河林场,河南济源454650

出　　处：《应用生态学报》2015年第12期3579-3587,共9页Chinese Journal of Applied Ecology

基　　金：林业公益性行业科研专项(201404206);国家自然科学基金项目(31400385);中央级公益性科研院所基本科研业务费专项(RIF2013-08)资助

摘　　要：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.4-10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与温度呈负相关关系,而季节性降水同位素与温度的相关性不显著.夏季大气水线斜率及降水过量氘(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^18O in precipitation and the influence factors were studied in the Xiaolangdi Reservoir area 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 lines（LMWL） of different seasons were established,and the water vapor sources in different seasons were investigated.The results showed that the δD and δ^18O in precipitation exhibited an extremely wide range and a distinct seasonal variation,and they were enriched in the spring,and depleted in the fall.The δD and δ^18O values showed negative correlations with the amount of precipitation from April to October and the fall,respectively.The δD values and the mean air temperature showed a negative correlation from April to October,but showed no correlation in seasonal precipitation.Both the slopes of LMWL and excess deuterium（d values） of precipitation were the smallest in the summer,and the largest in the fall.The results of air mass back trajectories of seasonal precipitation using the HYSPLIT model indicated a dominant effect of southeast and southwest maritime monsoon air masses in the summer and the co-influence of continental and oceanic monsoons air masses in the spring and fall in the study area.

关 键 词：δD Δ^18O 大气降水线 过量氘 水汽来源 黄河小浪底库区 东部季风区 

分 类 号：P426[天文地球—大气科学及气象学]