引用本文: | 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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摘要: |
【目的】揭示灌区生态系统水循环过程对气候变化的响应机制,分析鄂尔多斯沿黄灌区大气降水同位素特征以及水汽来源。【方法】采用液态水稳定氢氧同位素技术,分析了2020年6—9月鄂尔多斯沿黄灌区大气降水稳定同位素与气温、日降水等影响因素的相关关系,建立了当地的大气降水线方程,通过氘盈余值的变化示踪水汽来源,利用HYSPLIT气团轨迹模型判定了研究区水汽来源的可靠性。【结果】(1)研究区大气降水同位素值在7、8月明显低于其他月份,与降水量在p=0.01水平上呈现极显著负相关关系;(2)研究区大气降水线为δD=7.13δ18O-1.67,受蒸发影响较大;(3)6月份水汽来源除了西风带和极地气团影响外还伴随了部分东南沿海方向的水汽,7、8月份水汽来源较为相似,均为西北方向,9月份则受西风带水汽、极地气团以及局地蒸发水汽的影响。【结论】降水量是降水同位素值变化的主控因素,在6—9月西风带水汽为研究区水汽来源的主要贡献者。 |
关键词: 鄂尔多斯沿黄灌区;大气降水;稳定同位素;水汽来源 |
DOI: |
分类号:S271 |
基金项目:鄂尔多斯市科技计划项目(20190101);“科技兴蒙”重点专项项目(KJXM-EEDS-2020010-01) ;国家青年科学(41901052) |
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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 |
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. |