热带西太平洋雨水的氢、氧同位素组成
Oxygen and hydrogen isotope composition of meteoric water in the tropical West Pacific Ocean
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摘要: 测定了西太平洋(7.5°～31°N,123°～132°E)1989年9～10月间雨水的δD和δ18O值,结果表明该区雨水的氢、氧同位素组成呈观与中、高纬度地区明显不同的分布特征.雨水的δ值与降水点的纬度没有直接的因果关系,而与季风流场明显相关.沿季风流动方向雨水的δ值逐渐减低,这可用降水云团的瑞利分馏过程解释.雨水δD和δ18O的分布大致反映了研究区季风流场的特征.Abstract: δD and δ18O values in samples of meteoric water obtained in the West Pacific Ocean (7.5°～31°N,123°～ 132°E) during the autumn cruises of 1989 are measured.The results show that there are obviously different distribution features of oxygen and hydrogen isotopes between the survey area and middle and high-latitude areas.A gradient variation of δ value along the direction of the monsoon is exhibited in the survey area in the West Pacific Ocean,which can be attributed to Releigh isotope fractionation of the cloud mass.The δD and δ18O distributions of meteoric water may reflect the general feature of the monsoon flow path.
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Key words:
- Tropical West Pacific Ocean /
- rain /
- oxygen and hydrogen isotopes /
- monsoon
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Dansgaard W.Stable isotopes in precipitation.Tellus,1964,16:436～468 Craig H.Isotopic variation in meteoric waters.Science,1961,133:1702～1703 卫克勤,林瑞芬.论季风气侯对我国雨水同位素组成的影响.地球化学,1994,23(1):33～41 喻世华,陆胜元编著.热带天气学概论.北京:气象出版社,1986 Ehhalt D,Knott K,Nagel J F,et al.Deuterium and oxygen-18 in rain water.J Geophys Res,1963,68:3775～3780 陈上及.中国近海季风和南海气旋活动的气候特征及对南海水文结构的影响.海洋学报,1994,16(1):1～11 高士英,韦定英,吕竟夕,等.亚洲季风区南北半球风场的相互作用与埃尔尼诺.海洋学报,1990,12(5):587～595 -
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