| Cite this article: | 孙晨云,郑和祥,李瑞平,等.鄂尔多斯沿黄灌区大气降水稳定同位素特征与水汽来源分析[J].灌溉排水学报,0,():-. |
| Sun Chenyun,Zheng Hexiang,Li ruiping,et al.鄂尔多斯沿黄灌区大气降水稳定同位素特征与水汽来源分析[J].灌溉排水学报,0,():-. |
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| Analysis of the Stable Isotopic Characteristics and Water Vapor Source of Atmospheric Precipitation in the Irrigation Area Along the Yellow River in Ordos |
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Sun Chenyun1, Zheng Hexiang2, Li ruiping1, Wu Jiabin2, Cao Xuesong2, Li Jiankun1
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1.School of Water Conservancy and Civil Engineering,Inner Mongolia Agricultural University;2.Institute of Water Resources for Pastoral Area,MWR
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| Abstract: |
| 【Objective】To reveal the response mechanism of the ecosystem water cycle process for climate change in the irrigation area. To further analyze the isotopic characteristics of atmospheric precipitation and the source of water vapor in the Yellow River irrigation area of Ordos. 【Method】The stable hydrogen and oxygen isotope technology of liquid water was adopted. The correlation between the stable isotope of atmospheric precipitation and the influencing factors such as air temperature and daily precipitation in the Yellow River irrigation area of Ordos from June to September 2 020 was analyzed. The local atmospheric downline equation was established. The source of water vapor was traced through the variation of deuterium surplus value. The reliability of the local water vapor source was further determined by adopting the HYSPLIT air mass trajectory model.【Result】(1)The isotopic value of atmospheric precipitation in the research district in July and August is significantly lower than that in other months, which shows a very significant correlation with precipitation at the level of p = 0.01.(2)The atmospheric drawdown line in the the research district is δD=7.13δ18O-1.67, which is affected by evaporation greatly.(3)In June, the water vapor source is affected by the westerly belt and the polar air mass. It is also accompanied by some water vapor in the southeast coastal direction. The water vapor sources in July and August are similar, all of which are from Northwestern China. In September, it is affected by the water vapor in the westerly belt, the polar air mass and the local evaporation water vapor at the same time.【Conclusion】Precipitation is the main controlling factor of the precipitation isotope value change. On the basis of HYSPLIT model simulation and dynamic change analysis of deuterium surplus value, the water vapor of the westerly zone is the main water vapor source in the district area during the research period. |
| Key words: Yellow River irrigation area of Ordos; atmospheric precipitation; stable isotopes; water vapor source. |
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