武威市降水pH值和电导率对沙尘天气的指示意义

doi:10.7522/j.issn.1000-694X.2016.00034

摘要/Abstract

摘要： 对武威市2013年7月至2014年6月收集的降水样品pH值、电导率和主要阴阳离子浓度进行测定和分析。结果表明：（1）降水样品的pH值6.69～8.84，平均值7.52。降水样品电导率33.9～766 μS·cm^-1，平均182.07 μS·cm^-1。（2）电导率冬季 >春季 >夏季 >秋季，pH值春季 >夏季 >秋季 >冬季。pH值与电导率呈显著的负相关，与风速呈正相关；电导率与降水量呈显著的负相关，与风速呈显著的负相关。（3）pH值和电导率都会随着沙尘事件的发生表现出增加的趋势。当沙尘事件发生的情况下，Na⁺、K⁺、Mg²⁺、Ca²⁺、SO₄^2-、Cl^-和NO₃⁺的离子浓度都呈现增加的趋势，但从各离子浓度变化幅度对沙尘事件的响应来看，Na⁺、K⁺和NO₃^-对沙尘天气比较敏感，反应强烈。

关键词: 沙尘天气, 降水, pH值, 电导率, 武威

Abstract: This research analyzed the pH, electric conductivity and the concentrations of main anion and cation of precipitation samples collected from July 2013 to June 2014 in Wuwei. The results showed that: (1)The pH of the precipitation samples ranged from 6.69 to 8.84, and the average was 7.52. The range of electric conductivity was 33.9-766 μS·cm^-1, and the average was 182.07 μS·cm^-1. (2)The order of electric conductivity was winter >spring >summer >autumn, and the order of pH was spring>summer>autumn>winter. The pH and electric conductivity showed a significant negative correlation. The pH showed a significant positive correlation with the wind speed. The electric conductivity showed significant negative correlation with the precipitation and wind speed. (3) The pH and EC showed an increasing trend with the occurrence of sand-dust events. When the sand-dust events occurred, the concentrations of Na⁺, K⁺, Mg²⁺, Ca²⁺, SO₄^2-, Cl^- and NO₃^- showed increasing trend, But Na⁺, K⁺ and NO₃ is relatively more sensitive to sand-dust events.

Key words: sand-dust weather, precipitation, pH, electric conductivity, Wuwei

中图分类号:

P426.6

李宗杰, 宋玲玲, 田青. 武威市降水pH值和电导率对沙尘天气的指示意义[J]. 中国沙漠, 2017, 37(3): 546-553.

Li Zongjie, Song Lingling, Tianqing. The pH and Electric Conductivity of Precipitation and their Indicative Significance of Sand-dust Weather in Wuwei, China[J]. JOURNAL OF DESERT RESEARCH, 2017, 37(3): 546-553.

参考文献

[1] 张仁健,韩志伟,王明星,等.中国沙尘暴天气的新特征及成因分析[ J].第四纪研究,2002,22(4):374-380.
[2] 叶笃正,丑纪范,刘纪远,等.关于中国华北沙尘天气的成因与治理对策[ J].地理学报,2000,55(5):513-521.
[3] 陈杰,赵素平,殷代英,等.沙尘天气过程对中国北方城市空气质量的影响[J].中国沙漠,2015,35(2):423-430.
[4] Cao J J,Shen Z X,Chow J C,et al.Winter and summer PM_2.5 chemical compositions in fourteen Chinese cities[J]Journal of the Air & Waste Management Association,2012,62(10):1214-1226.
[5] 李万元,吕世华,董治宝,等.巴丹吉林沙漠周边地区降水量的时空变化特征[J]中国沙漠,2015,35(1):94-105
[6] Kong S F,Ji Y Q,Lu B,et al.Characterization of PM₁₀ source profiles for fugitive dust in Fushun-a city famous for coal[J].Atmospheric Environment,2011,45(30):5351-5365.
[7] 李玲萍,刘维成,张宇林,等.石羊河流域主汛期降水日变化特征[J].中国沙漠,2015,35(5):1291-1300.
[8] 郭小燕,冯起,李宗省,等.敦煌盆地降水稳定同位素特征及水汽来源[J].中国沙漠,2015,35(3):715-723.
[9] 郝明途,高健,戴晓燕,等.大气颗粒物化学质量平衡源解析方法研究[J].环境科学与管理,2011,36(12):54-61.
[10] Li Z X,Feng Q,Liu W,et al.The stable isotope evolution in Shiyi glacier system during the ablation period in the north of Tibetan Plateau,China[J].Quarternary International,2015,17(4):262-271.
[11] Li W,Zhai P M.Variability in occurrence of China's spring sand/dust storm and its relationship with atmospheric general circulation[J].Acta Meteorologica Sinica,2003,17(4):396-405.
[12] Li Z J,Li Z X,Wang T,et al.Composition of wet deposition in the central Qilian Mountains,China[J].Environmental Earth Sciences,2015,73(11):7315-7328.
[13] Guo X Y,Feng Q,Liu W,et al.Stable isotopic and geochemical identification of groundwater evolution and recharge sources in the arid Shule River Basin of Northwestern China[J].Hydrological Processes,2015,29(22):4703-4718.
[14] Xu Z F,Li Y S,Tang Y,et al.Chemical and strontium isotope characterization of rainwater at an urban site in Loess Plateau,Northwest China[J].Atmospheric Research,2009,94:481-490.
[15] Lu X W,Li L Y,Li N,et al.Chemical characteristics of spring rainwater of Xi'an City,NW China[J].Atmospheric Environment,2011,45:5058-5063.
[16] 李宗杰,李宗省,田青,等.祁连山中段降水化学的环境意义研究[J].环境科学,2014,35(12):4465-4474.
[17] Xu J,Hou S,Qin D,et al.Dust storm activity over the Tibetan Plateau recorded by a shallow ice core from the north slope of Mt.Qomolangma (Everest),Tibet-Himal region[J].Geophysical Research Letters,2007,34(34):L17504.