雨季玉龙雪山白水1号冰川表层雪中无机离子特征及环境意义

doi:10.11849/zrzyxb.2013.04.014

摘要/Abstract

摘要：

分析了玉龙雪山白水1号冰川雨季(5-10月)表层雪中无机离子的组成和特征,并与其他高海拔地区湿沉降进行对比。结果表明:白水1号冰川表层雪一定程度上受到了人类活动的影响;由于雨季强烈的淋溶作用,表层雪SO₄^2-含量较低,酸度的主要贡献离子是NO₃^-;pH值较高的原因是碱性金属离子的中和作用;海盐示踪结果显示雨季表层雪中离子来源主要以海源为主。在6-9月之间由于降水的淋洗作用,表层雪中离子浓度较低。表层雪中NO₃^-、SO₄^2-、Ca²⁺高于大多数其他高海拔区域降水,是表层雪中无机离子浓度的主要贡献者,Ca²⁺浓度较高说明该地区高空水汽也受到了局地岩石岩性的强烈影响。

关键词: 白水1号冰川, 表层雪, 湿沉降, 无机离子

Abstract:

The glaciers on Yulong Mountain (5596 m a.s.l.) are located in the southernmost in mainland Eurasia. The largest is Baishui Glacier No.1. The snow that accumulates on Baishui Glacier No.1 includes marine aerosols associated with the summer monsoon, and dust brought in winter is from Central/West Asia, Africa or the Thar Desert area. In order to further understand the influence of natural and human factors on the regional atmosphere and precipitation chemical characteristics, fresh snow samples at Baishui Glacier No.1 were collected from April 2006 to October 2006 for chemical data analysis.The characteristics of ion and the changes of surface snow in rainy season in Baishui Glacier No.1, Yulong Snow Mountain had been analyzed and discussed. Contrast analyses with wet deposition at high altitudes of other mountains and plateaus were also carried out. The results showed that the surface snow can be seen as the background value for summer precipitation chemical composition in the Yulong Mountain area. The main acidity ion is NO₃^- in rainy season. pH is higher because of the neutralization of Ca²⁺. Sea salt tracer analysis showed that sea originated aerosol was the dominant source of dissolved ions in surface snow. The ions concentration was low during the mid June to September and was negatively correlated with precipitation. The ions of NO₃^-, SO₄^2- and Ca²⁺ in the study area, as the main contributor to inorganic ions, were higher than most precipitation at other high altitudes areas. Moreover, high concentration of Ca²⁺ showed significant influence of local lithology on high-level wet deposition.

Key words: Baishui Glacier No.1, surface snow, wet deposition, inorganic ions

中图分类号:

P343.6

朱国锋, 蒲焘, 何元庆, 张涛, 牛贺文. 雨季玉龙雪山白水1号冰川表层雪中无机离子特征及环境意义[J]. 自然资源学报, 2013, 28(4): 678-686.

ZHU Guo-feng, PU Tao, HE Yuan-qing, ZHANG Tao, NIU He-wen. Inorganic Ion Characteristics and Climatic-Environmental Significance of Rainy Season Surface Snow in Baishui Glacier No.1, Yulong Snow Mountain, China[J]. JOURNAL OF NATURAL RESOURCES, 2013, 28(4): 678-686.

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