典型海洋型冰川雪冰中吸光性物质及其对冰川消融的影响研究

深入认识雪冰中吸光性物质的特征和影响是目前冰川学研究的热点问题，吸光性物质对雪冰消融影响的量化研究是理解雪冰消融机理的难点所在。本项目选取位于青藏高原东南端的玉龙雪山典型海洋型冰川为研究区域，以雪冰中的吸光性物质（黑碳、粉尘、有机碳）为研究对象，利用野外连续观测、样品采集、实验测试、模型模拟等方法，拟开展如下研究：（1）探讨典型海洋型冰川雪冰中吸光性物质含量的时空分布特征以及在雪冰中的物理（淋溶、富集、迁移）和化学变化过程；（2）观测雪冰表面反照率和雪冰物理参数，结合SNICAR模型和吸光性物质浓度，模拟计算雪冰中吸光性物质对雪冰表面反照率降低的贡献比例和辐射强迫；（3）建立吸光性物质的能量平衡模型，模拟和评估吸光性物质对冰川消融的影响。该研究有助于理解吸光性物质影响冰雪消融的潜在机理，为应对气候和环境变化具有重要的科学和现实意义。

It is a hot topic in glaciology that deeply explore the characteristics and its influences of light-absorbing impurities (LAPs) in snow and ice, quantitative analysis of the influences of LAPs on glacier melt is the difficulty point for understanding the mechanism of glacier melt. In this project, snow and ice samples will be collected from a typical temperature glacier in Mt. Yulong, located at the southeastern Tibetan Plateau. Main purpose of the study is to explore the characteristics and its influences of LAPs (black carbon, dust, organic carbon) deposited on snow and ice of Mt. Yulong glaciers. By employing the methods of experimental measurement, model simulation and field observation, we will analysis the following scientific problems: (1) Explore the spatial and temporal characteristics and observe the phys-chemical variations (including leaching, enrichment, migration) of LAPs in a typical temperate glacier. (2) Measure the albedo and physical parameters of surface snow and ice, combing with the SNICAR model and concentrations of LAPs in snow and ice, estimate the contribution percentage of LAPs in reducing the albedo of surface snow and ice, and calculate the radiative forcing of LAPs. (3) Establish the energy balance model of LAPs, simulate and quantify the influences of LAPs on glacier melt. This project has prime scientific and practical importance in dealing with climate and environment change, since it provides the better understanding of potential causes of glacier melt.