| 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,2022,41(4):93-100. |
| 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,2022,41(4):93-100. |
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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，与降水量在p=0.01水平上呈极显著负相关关系；②研究区大气降水线为δD=7.13δ18O-1.67，受蒸发影响较大；③6月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月水汽来源较为相似，均为西北方向，9月则受西风带水汽、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：10.13522/j.cnki.ggps.2021463 |
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| Stable Isotopes in Precipitation in Irrigation Areas in the Proximity of Yellow River in Ordos and the Origin of Its Water Vapor |
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SUN Chenyun, ZHENG Hexiang, LI Ruiping, et al.
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1.School of Water Conservancy and Civil Engineering, Inner Mongolia Agricultural University, Hohhot 010018, China;
2. Institute of Water Resources for Pastoral Area, MWR, Hohhot 010020, China
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| Abstract: |
| 【Objective】Global warming has resulted in change in precipitation across many regions around the world. In this paper, we analyze the stable isotopes in precipitation in Ordos of Inner Mongolia, and then used them to track the origin of the water vapor in the irrigation areas proximal to the Yellow River in the region.【Method】 Rainfalls were sampled from June to September in 2020, and stable hydrogen and oxygen isotopes in them were measured. Their correlation with factors including air temperature and daily precipitation was analyzed, from which we established the downline equations. The origin of the water vapor was tracked based on the variation of deuterium surplus value; reliability of the results was determined by the HYSPLIT air mass trajectory model 【Result】①The isotopes in the sampled precipitation during the experimental period was significantly lower than that in other months, showing their significant correlation with rainfall with p=0.01. ②The downline equation was δD=7.13δ18O-1.67, affected by evaporation greatly. ③Water vapor in June was affected by both the westerly belt and the polar air mass, accompanied by water vapor coming from the southeast coastal region. The water vapor in July and August was similar, coming from northwestern China. Water vapor in September was affected by the water vapor in the westerly belt, the polar air mass and local evapotranspiration.【Conclusion】Precipitation is the main factor determining its isotope content and origin. The HYSPLIT simulation and dynamic-change analysis of the deuterium surplus value showed that the water vapor in the westerly zone is the origin of the water vapor seen in the studied area. |
| Key words: Ordo’s irrigated area along the Yellow-River; atmospheric precipitation; stable isotopes; water vapor source |
