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冰川冻土 ›› 2023, Vol. 45 ›› Issue (1): 18-30.doi: 10.7522/j.issn.1000-0240.2022.0363

• 第二次青藏高原综合科学考察研究 • 上一篇    下一篇

青藏高原东南和西南部冬季积雪化学组成研究

张愉萱1,2(), 王宁练1,2,3(), 武小波4, 杨雪雯1,2, 李瑶5, 方振祥1,2   

  1. 1.陕西省地表系统与环境承载力重点实验室,陕西 西安 710127
    2.西北大学 城市与环境学院/地表系统与灾害研究院,陕西 西安 710127
    3.中国科学院 青藏高原研究所,北京 100101
    4.中国科学院 西北生态环境资源研究院,甘肃 兰州 730000
    5.中山大学 大气科学学院,广东 广州 519082
  • 收稿日期:2022-04-08 修回日期:2022-06-04 出版日期:2023-02-28 发布日期:2023-02-25
  • 通讯作者: 王宁练 E-mail:13795858945@163.com;nlwang@nwu.edu.cn
  • 作者简介:张愉萱,硕士研究生,主要从事雪冰中氢氧同位素的研究. E-mail: 13795858945@163.com
  • 基金资助:
    第二次青藏高原综合科学考察研究项目(2019QZKK020102)

Study on chemical composition of snowpack in southeast and southwest of Tibetan Plateau in winter

Yuxuan ZHANG1,2(), Ninglian WANG1,2,3(), Xiaobo WU4, Xuewen YANG1,2, Yao LI5, Zhenxiang FANG1,2   

  1. 1.Shaanxi Key Laboratory of Earth Surface System and Environmental Carrying Capacity,Xi’an 710127,China
    2.Institute of Earth Surface System and Hazards,College of Urban and Environmental Sciences,Northwest University,Xi’an 710127,China
    3.Institute of Tibet Plateau Research,Chinese Academy of Sciences,Beijing 100101,China
    4.Northwest Institute of Eco-Environment and Resources,Chinese Academy of Sciences,Lanzhou 730000,China
    5.School of Atmospheric Sciences,Sun Yat-sen University,Guangzhou 519082,China
  • Received:2022-04-08 Revised:2022-06-04 Online:2023-02-28 Published:2023-02-25
  • Contact: Ninglian WANG E-mail:13795858945@163.com;nlwang@nwu.edu.cn

摘要:

根据2021年1月在青藏高原东南和西南部所采集的73个积雪样,通过测定积雪中氢氧稳定同位素和可溶性无机离子,结合主成分分析和Hysplit后向轨迹分析,揭示了干季氢氧稳定同位素(δD和δ18O)分馏特征及水汽迁移对积雪剖面化学组分变化的影响,讨论了氢氧稳定同位素与气候的关系和可溶性无机离子组成及来源。结果表明:整个研究区积雪大气水线为δD=7.86δ18O+11.8(R2=0.95),接近拉萨冬季大气水线,且东南部大气水线斜率和截距略低于西南部;δD和δ18O波动分别介于-178.11‰~ -68.07‰和-23.80‰~-9.61‰,d-excess值波动范围为11.03‰~23.49‰,表现为冬季δD、δ18O低值,高d-excess值;雪坑表层相对富集重同位素,同位素值高于下层雪样,且积雪内部的水汽迁移使得分层雪样的δD和δ18O关系曲线的斜率出现差异;主要可溶性无机离子浓度序列为Ca2+>SO42->Na+>NO3->Cl->K+>Mg2+>NH4+,其中Ca2+(42.47%)、SO42-(23.53%)分别在阳、阴离子中占比最大,且东南部离子浓度平均值高于西南部;主成分分析结果显示,陆源是积雪中离子的主要来源,NH4+和部分NO3-与人类活动有关;后向气团轨迹显示,水汽来源与高空西风环流控制的水汽输送有关,且离子大多为冬季西风所携带的陆源矿物粉尘。

关键词: 青藏高原, 积雪, 氢氧稳定同位素, 无机离子

Abstract:

According to 73 snow samples collected in the southeast and southwest of Tibetan Plateau in January, 2021, the characteristics of hydrogen and oxygen stable isotopes(δD and δ18O) fractionation in dry season and the influence of water vapor migration on the chemical composition change of snow profile were revealed by measuring the stable isotopes of hydrogen and oxygen and soluble inorganic ions in snow, and the relationship between stable isotopes of hydrogen and oxygen and climate and the composition and source of soluble inorganic ions were discussed. The results show that the local meteoric waterline of snowpack in the whole study area is δD=7.86δ18O+11.8 (R2=0.95), which is close to the Lhasa winter meteoric waterline, and the slope and intercept of the meteoric waterline in the southeast are slightly lower than those in the southwest. δD and δ18O fluctuates from -178.11‰ to -68.07‰ and -23.80‰ to -9.61‰, respectively, and the d-excess values fluctuate from 11.03‰ to 23.49‰, showing low values of δD and δ18O in winter, and high d-excess values. The surface layer is relatively enriched in heavy isotopes, and the isotope values are higher than those of the lower snow samples, and the water vapor migration inside the snow makes the slope of the relationship between δD and δ18O different. The concentration sequence of the main soluble inorganic ions is Ca2+>SO42->Na+>NO3->Cl->K+>Mg2+>NH4+, of which Ca2+ (42.47%), SO42- (23.53%) accounted for the largest proportion of cation and anion, respectively, and the average concentration of ions in the southeast was higher than that in the southwest. The results of principal component analysis show that terrigenous sources are the main source of ions in snow, and NH4+ and some NO3- are related to human activities. The backward air mass trajectory shows that the source of water vapor is related to the water vapor transport controlled by the upper-altitude westerly circulation, and most of the ions are terrestrial mineral dust carried by westerly winds in winter.

Key words: Tibetan Plateau, snowpack, stable hydrogen and oxygen isotopes, inorganic ions

中图分类号: 

  • P426.63+5