Understanding the variability of water isotopologues in near-surface atmospheric moisture over a humid subtropical rice paddy in Tsukuba, Japan
Understanding the variability of water isotopologues in near-surface atmospheric moisture over a humid subtropical rice paddy in Tsukuba, Japan
复制标题
DOI：
10.1016/j.jhydrol.2015.11.044
复制
发表时间：
2016-02
影响因子：
6.4
通讯作者：
Zhongwang Wei;K. Yoshimura;A. Okazaki;K. Ono;Wonsik Kim;Masaharu Yokoi;Chun-Ta Lai
中科院分区：
文献类型：
--
作者：
Zhongwang Wei;K. Yoshimura;A. Okazaki;K. Ono;Wonsik Kim;Masaharu Yokoi;Chun-Ta Lai
2013 年 6 月至 2014 年 5 月，我们在日本筑波潮湿的亚热带稻田上空观测到了降水和大气水蒸气中的稳定同位素。我们利用观测到的同位素比率，结合同位素支持的大气环流模型（GCM；同位素合并的全球光谱模型：IsoGSM）来加深我们对水分源和输送对水蒸气同位素变化影响的理解。水汽和降水的同位素测量表明，研究区的水汽同位素不仅受到气雨同位素交换的控制，还受到季节时间尺度上与陆地蒸散和大规模大气环流相关的其他动力学效应的控制。陆地蒸散量对当地水汽含量（F ET）的年平均贡献约为16.0±12.3%，夏季最大值为20.5±12.9%。我们的结果表明，大尺度大气环流是近地表水汽δ D 变化的主要控制因素。IsoGSM 标记模拟实验表明，地表水汽同位素的大时间变化主要归因于来自不同海洋源区的水汽的平流和混合。
We observed stable isotopes in precipitation and atmospheric water vapor over a humid subtropical rice paddy field in Tsukuba, Japan, from June 2013 to May 2014. We used observed isotope ratios, in combination with an isotope-enabled general circulation model (GCM; Isotopes-incorporated Global Spectral Model: IsoGSM) to improve our understanding of the impacts of moisture sources and transport on the variability of water vapor isotopes. The isotopic measurements of water vapor and precipitation suggested that vapor isotopes in the study area were controlled by not only air-rain isotopic exchange, but also other kinetic effects associated with land evapotranspiration and large scale atmospheric circulation at the seasonal time scale. The contribution of land evapotranspiration to local water vapor content (F ET) was approximately 16.0±12.3% as an annual average, with a summer maximum of 20.5±12.9%. Our results show that large-scale atmospheric circulation is the primary control on the variability of near surface water vapor δ D. An IsoGSM tagging simulation experiment demonstrated that the large temporal variation of surface water vapor isotopes can primarily be attributed to advection and mixing of moisture from different oceanic source regions.