河西走廊东段大气降水特征及水汽来源分析
Analysis of precipitation characteristics and water vapor sources in the East of Hexi Corridor
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摘要: 通过连续收集降水样品对河西走廊东段大气降水特征及水汽来源进行研究,运用相关分析、因子分析、富集因子和HYSPLIT模型,探讨2013年7月3日—2014年7月3日河西走廊东段降水常量离子的化学特征,结果表明,河西走廊东段pH值介于6.86—8.71,降水样品的电导率分布在78.42—502.50 μS·cm-1之间.Ca2+、Na+、Cl-、NO3-和SO42-是降水中的主要离子,Ca2+和Na+的浓度占阳离子总浓度的77.43%,而Cl-、NO3-和SO42-占阴离子总浓度的99.12%,降水中阳离子浓度的大小顺序为Ca2+> Na+> NH4+> K+> Mg2+,降水中阴离子浓度的大小顺序为SO42-> NO3-> Cl- >NO2- >F-;夏季大气降水中总离子浓度最低(50.61 ueq·L-1),而冬、春两季浓度较高,且春季最高(115.45 ueq·L-1);而单个降水离子的最高浓度却多出现在3—7月份;河西走廊东段的降水离子主要受陆源以及工农业生产和人类活动控制,海盐离子的影响极小.Abstract: Precipitation characteristics and water vapor source in the east of Hexi corridor were investigated by continuous collection of precipitation samples. The chemical characteristics of precipitation constant ion from 3 July, 2013 to 3 July, 2014 in the east of Hexi Corridor were analyzed using the correlation analysis, factor analysis, enrichment factor and HYSPLIT model. The results showed that the pH value for the east of Hexi corridor was between 6.86 and 8.71, and the electrical conductivity of the precipitation samples was between 78.42 and 502.50 μS·cm-1. Ca2+, Na+, Cl-, NO3- and SO42- were the major ions in precipitation. The concentrations of Ca2+ and Na+ accounted for 77.43% of the total cation concentration, while Cl-, NO3- and SO42- accounted for 99.12% of the total anion concentration. The order of the cation concentration was Ca2+> Na+> NH4+> K+> Mg2+,the order of anion was SO42-> NO3-> Cl-> NO2-> F-. The lowest total ion concentration in atmospheric precipitation occured in the summer (50.61 μeq·L-1), and higher concentration of ion in the spring and winter season. Concentration in the spring was the highest (115.45 μeq·L-1). The highest concentration of each ion appeared between March and July. Ion precipitation in the eastern part of the Hexi corridor was mainly controlled by terrestrial, industrial and agricultural production, and human activities. The influence of sea salt ions is very low.
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