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2~28 μm，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4 500~4 700 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1.600 8~1.845 6，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。

Abstract： The study on the physical and chemical characteristics and micro morphology of ice dust in Yulong Snow Mountain reveals the formation mechanism, sources and influencing factors of ice dust in the study area, and provides a scientific basis for understanding the mechanism of glacier melting. Taking the ice dust samples collected from the melting ice surface in the Yulong Snow Mountain Glacier area from August to September 2023 as the research carrier, the physical and chemical characteristics and formation mechanism of ice dust were analyzed, and the potential effects of ice dust on glacier melting and carbon cycle in the glacier area were discussed. Through the particle size test, total organic carbon analysis and micro morphology analysis of ice dust samples, it is found that the mode of mineral particle size distribution in ice dust is between 2~28 μm, and the distribution structure is relatively simple, mainly due to dust deposition and local rock weathering; The total organic carbon content of ice dust in snow and ice samples is relatively high, and the total organic carbon content of ice dust increases with the decrease of altitude (the altitude of the sampling point ranges from 4 500 to 4 700 m), indicating that the strong melting of glaciers in summer has a significant impact on the transport and spatial distribution of dissolved organic matter; The microscopic morphology of ice dust is mainly dense argillaceous structure, and the appearance characteristics of inorganic and organic substances are obvious. There are uneven and complex pores inside, and the fractal dimension is high, ranging from 1.600 8 to 1.845 6. At the same time, the energy spectrum analysis of ice dust detected rich elements such as C, Si, O and Al, indicating that the ice dust is rich in carbonate, silicate, organic matter and other substances, which is closely related to glacier melting. The development of this study is conducive to the comparative analysis with other glacier related studies, and has guiding significance for the study of the physical and chemical characteristics and micro morphology of ice dust from other glaciers. In the follow-up in-depth study, it can be considered to carry out the determination of mineral types and quantitative analysis of element content of ice dust in the glacier area of Yulong Snow Mountain under the condition of additional sampling range and quantity.