摘要
研究玉龙雪山冰尘的理化特征及其微观形貌,不仅可以揭示区域内冰尘的形成机理、来源和影响因素等,更为进一步理解影响冰川消融的机制提供了科学依据。以2023年8~9月在玉龙雪山冰川区消融冰表面采集的冰尘样品为研究载体,分析了冰尘的理化特征和形成机制,讨论了冰尘对冰川融化和冰川区碳循环的潜在影响。通过对冰尘样品进行粒度测试,对总有机碳和微观形貌进行分析,发现冰尘中矿物颗粒体积粒径分布众数介于2~28μm,分布结构较为单一,主要源于粉尘沉降和局地岩石风化;雪冰样品中冰尘的总有机碳含量相对较高,且冰尘总有机碳含量随海拔降低而增加(采样点海拔范围在4500~4700 m),表明夏季冰川强烈消融对溶解性有机物质的输送和空间分布存在显著影响;冰尘微观形貌主要表现为致密泥质结构,无机物质和有机物质外观特征明显,内部存在不均匀且形态复杂的孔隙,分形维数较高,介于1.6008~1.8456,同时冰尘能谱分析检出了丰富的C、Si、O和Al等元素,表明冰尘中富含碳酸盐、硅酸盐和有机质等物质,这与冰川消融密切相关。研究结果有利于与其他冰川相关研究进行对比分析,对研究其他冰川冰尘理化特征及微观形貌具有指导意义。
The study of the physical,chemical,and micromorphological characteristics of ice dust in the Yulong Snow Mountain glacier area reveals the formation mechanisms,sources,and influencing factors of ice dust in the region,providing a scientific basis for understanding glacier melting processes.Using ice dust samples collected from the melting ice surface in the glacier area between August and September 2023,the physical and chemical properties and formation mechanisms of ice dust were analyzed,and the potential effects of ice dust on glacier melting and the carbon cycle were discussed.Particle size analysis,total organic carbon measurement,and micromorphological examination of the samples revealed that the mode of mineral particle size distribution in ice dust ranged from 2 to 28μm.The distribution structure was relatively simple,primarily due to dust deposition and local rock weathering.The total organic carbon content in ice dust from snow and ice samples was relatively high and increased with decreasing altitude(sampling point elevations ranged from 4700 to 4500 m).This suggests that strong glacier melting in summer substantially influences transport and spatial distribution of dissolved organic matter.Microscopic morphology of the ice dust was mainly a dense argillaceous structure,with distinct appearances of both inorganic and organic substances.The internal structure exhibited uneven and complex pores,with a high fractal dimension ranging from 1.6008 to 1.8456.Energy-dispersive spectroscopy detected abundant elements such as C,Si,O,and Al,indicating that the ice dust contains carbonates,silicates,organic matter,and other substances closely related to glacier melting.This study supports comparative analysis with other glacier-related research and provides guidance for future investigations into the physical and chemical characteristics and micromorphology of ice dust from other glaciers.Future in-depth studies will focus on determining mineral types and conducting quantitative elemental analysis of ice dust in the Yulong Snow Mountain glacier area,with an expanded sampling range and quantity.
作者
张炜忠
牛贺文
卜爱军
ZHANG Weizhong;NIU Hewen;BU Aijun(College of Resources and Environment,Lanzhou University,Lanzhou 730000,China;National Key Laboratory of Cryosphere Science and Frozen Soil Engineering,Field Observatory for Cryosphere and Sustainable Development of Yulong Xueshan,Northwest Institute of Ecology and Environmental Resources,Chinese Academy of Sciences,Lanzhou 730000,China;University of the Chinese Academy of Sciences,Beijing 100049,China)
出处
《地球科学进展》
北大核心
2025年第5期540-550,共11页
Advances in Earth Science
基金
第二次青藏高原科学考察计划项目(编号:2019QZKK0605)
中国科学院青年创新促进会(编号:2021429)资助.
关键词
冰川冰尘
玉龙雪山
理化特征
微观形貌
Glacial cryoconite
Yulong Snow Mountain
Physico-chemical characteristics
Micromorphology
