为了解武汉市降水同位素组成,收集武汉市2011—2013年大气降水中氢氧稳定同位素,并结合气象资料和国际原子能机构(International Atomic Energy Agency,简称IAEA)提供的1986—1998年的数据资料,建立了武汉市地区大气降水线方程,分析了武汉地区大气降水中稳定同位素的变化特征。结果表明:武汉市地区降水线为δD=8.29 δ18O+7.44,与中国大气降水线相接近;降水中氢氧同位素组成季节变化明显,春季降水中δ18O值最大,而夏季最小;武汉市降水中δ18O值呈现上升趋势,降水中δ18O与气温和降水量均呈现负相关关系,且在时间上是多变的。水汽源是控制武汉市大气降水中氢氧同位素组成的重要因素。
Abstract
In this research we collected the meteoric precipitation samples in Wuhan city during 2011-2013 and combined with the meteorological data and the stable isotopes in precipitation during 1986-1998 provided by International Atomic Energy Agency (IAEA) to establish the local meteoric water line for Wuhan, China. The characteristics of stable isotope in precipitation in Wuhan was analyzed. The results indicated that the local meteoric water line for Wuhan was δD=8.29δ18O+7.44, in close agreement with China atmospheric precipitation line. Both hydrogen and oxygen stable isotopes in precipitation exhibited significant seasonal variations, δ18O of precipitation was the largest in spring, and the smallest in summer. There was a negative correlation between δ18O of precipitation and air temperature and the amount of precipitation, and was changeable in time. The δ18O of precipitation in Wuhan presented an upward trend. Moisture source is the primary factor determining the hydrogen and oxygen stable isotopes composition in precipitation in Wuhan.
关键词
大气降水 /
稳定同位素 /
水汽源 /
大气降水线 /
武汉市
Key words
meteoric precipitation /
stable isotope /
moisture source /
atmospheric precipitation line /
Wuhan
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基金
国家自然基金青年科学基金项目(51409191);湖北省自然科学基金面上项目(2013CFB286)
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