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冰川冻土 ›› 2002, Vol. 24 ›› Issue (2): 186-191.doi: 10.7522/j.issn.1000-0240.2002.0032

• 冰冻圈与全球变化 • 上一篇    下一篇

乌鲁木齐河源区水体和大气气溶胶化学成分研究

孙俊英, 秦大河, 任贾文, 李忠勤, 侯书贵   

  1. 中国科学院寒区旱区环境与工程研究所冰芯与寒区环境重点实验室, 甘肃兰州, 730000
  • 收稿日期:2001-05-30 修回日期:2001-10-26 出版日期:2002-04-25 发布日期:2012-04-26
  • 基金资助:

    中国科学院知识创新工程项目(KZCX2-305);中国科学院寒区旱区环境与工程研究所知识创新工程项目(CACX210046;CACX210506);中国科学院天山冰川观测试验站基金;中国科学院冰冻圈动态变化基础研究(三期);中国科学院留学经费择优支持回国工作基金资助

A Study of Water Chemistry and Aerosol at the Headwaters of the Ürüqi River in the Tianshan Mountains

SUN Jun-ying, QIN Da-he, REN Jia-wen, LI Zhong-qin, HOU Shu-gui   

  1. Key Laboratory of Ice Core and Cold Regions Environment, CAREERI, CAS, Lanzhou Gansu 730000, China
  • Received:2001-05-30 Revised:2001-10-26 Online:2002-04-25 Published:2012-04-26

摘要: 对天山乌鲁木齐河源区采集的大气气溶胶、大气降水、积雪和径流样品中的主要离子 (Cl-,NO3-,SO42-,Ca2+,Mg2+,Na+,K+,NH4+,其中降水中未测定NH4+)的测定结果进行分析和讨论.结果表明,所测阳离子当量浓度总和为所测阴离子当量浓度总和的 2~8倍,认为缺失阴离子主要为HCO3-,因此,HCO3-,Ca2+ 是各种水体及气溶胶的主导阴、阳离子.在采样时段各种水体中的离子浓度顺序为乌鲁木齐河源 1号冰川径流 >总控径流 >空冰斗径流 >降水 >积雪,积雪和降水样品的pH值接近中性,径流样品明显偏碱性.通过比较不同水体中的离子浓度,了解到干、湿沉积、积雪淋溶对不同水体中离子浓度的改变及影响

关键词: 乌鲁木齐河源区, 气溶胶, 大气降水, 径流

Abstract: Aerosol, precipitation, snow and runoff samples were collected from the headwaters of the Ürüqi River from May to June 1996. The measurement of major anions and cations (Cl-, NO3-, SO42-, Ca2+, Mg2+, Na+, K+, NH4+), and pH has been made for these samples, except that ammonium has not been done for precipitation samples. pH measurements show that snow and precipitation samples are near to neutral while runoff samples are slightly alkaline. It is found that the sum of measured cations is 2 to 8 fold of measured anions in equivalent unit for aerosol, precipitation, snow and runoff samples. The fact that the measured cations in aerosol exceed the measured anions also suggests that the atmosphere is alkaline over the glacier. According to the previous studies over this area, the missing anion is assumed to be bicarbonate. Thus, bicarbonate and calcium are the dominant anion and cation, respectively, for aerosol, precipitation, snow and runoff samples in this area. The total ionic concentration in various waters is in the order: runoff below the Glacier No. 1>runoff at the control point>runoff below the ice free cirque>precipitation>snow. However, the order of the concentration for different ions is not the same for these waters and aerosol, e.g., Ca2+ >Mg2+ > Na+ >K+ >NH4+ for snow and runoff samples, Ca2+ >Na+ >Mg2+ >K+ for aerosol and precipitation samples, while HCO3->SO42-> Cl- >NO3- for aerosol, precipitation, runoff below the Glacier No. 1 and at the control point, HCO3->Cl- >SO42->NO3- for snow and below the ice free cirque. Through the comparison of ionic concentration in different waters, the effect of some processes, such as wet deposition, dry deposition, preferential elution etc, on the certain ionic concentration in the waters is revealed. For example, preferential elution results in lower concentration of SO42- and NO3- and dry deposition enhances concentration of Mg2+, Ca2+ and K+ in snow.

Key words: aerosol, precipitation, runoff, Ür黰qi River

中图分类号: 

  • P426.61+2