Water vapor and precipitation isotope ratios in Beijing, China
Water vapor and precipitation isotope ratios in Beijing, China
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DOI：
10.1029/2009jd012408
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发表时间：
2010-01
影响因子：
--
通讯作者：
X. Wen;Shichun Zhang;Xiaomin Sun;Guirui Yu;X. Lee
中科院分区：
文献类型：
--
作者：
X. Wen;Shichun Zhang;Xiaomin Sun;Guirui Yu;X. Lee
本文研究了北京地区降水和地面大气水汽的δ D、δ（18）O和氘过量（d）的特征。用原位技术连续测量了地面空气中大气水汽的δ D、δ（18）O和d。在夏季风季节（6月至8月）的蒸汽同位素含量的日变化和日变化少得多，比在一年中的其他时间。在季风季节以外，水汽δ D和δ（18）O与水汽混合比呈对数线性关系，d与当地相对湿度呈负相关。这两种关系都具有统计学意义。在夏季风活动高峰期，水汽混合比和相对湿度对水汽同位素时间变化的预测能力较差。此外，还分析了汽相和凝相之间同位素交换的相互作用。Δ D和Δ（18）O偏离平衡态与相对湿度呈正相关，d偏离平衡态与相对湿度呈负相关。
The objective of this study is to investigate the characteristics of delta D, delta(18)O, and deuterium excess (d) of precipitation and water vapor in surface air in Beijing, China. The delta D, delta(18)O, and d of atmospheric water vapor in surface air were measured continuously with an in situ technique. Much less day-to-day and diurnal variations in the vapor isotopic contents were observed in the summer monsoon season (June-August) than in the rest of the year. Outside the monsoon season, the vapor delta D and delta(18)O showed a log linear dependence on the vapor mixing ratio, and d showed a negative correlation with the local relative humidity (RH). Both relationships were statistically significant. The vapor mixing ratio and RH were poor predictors of the vapor isotopic temporal variability during the peak summer monsoon activities. In addition, an analysis was presented of the interaction of the isotopic exchange between the vapor and the condensed phase. The delta D and delta(18)O departure from the equilibrium state was positively correlated with RH, and the d departure from the equilibrium state was negatively correlated with RH.