近年来，新发展起来的微生物类脂物甘油二烷基甘油四醚（GDGTs）已成为生物地球化学领域的研究热点。冰尘中微生物类脂物GDGTs 的结构和组成会随着冰川环境温度以及其它环境因子的变化在分子级别上予以很灵敏地响应。本研究以青藏高原冰川冰尘、雪冰不溶微粒和冰川周围表层土壤为研究对象，通过对不同结构和类型的GDGTs化合物（包括古菌iGDGTs和细菌bGDGTs）的分子特征研究，建立适用于青藏高原冰川古气候研究的转换方程，为高原冰川古气候定量重建提供研究基础。通过青藏高原冰川冰尘中甾醇的分布状况和浓度水平分析，探讨冰尘有机质的来源。研究青藏高原不同区域冰川冰尘中不同来源有机质的贡献, 无论对于了解陆源有机质还是对于探究原位产生的有机质都具有重要意义。

In recent years, Glycerol dialkyl glycerol tetraethers (GDGTs) are synthesized by archaea and bacteria have become one of the hot spots in biogeochemistry research nowadays. Microbial lipids can record environmental change on basis of variations of their structures and compositions, and therefore have been widely applied to reconstruct paleoenvironment. Cryoconites, ice snow insoluble particles and surface soil near glacier were collected from the Tibetan Plateau to analyze and study the molecular characteristic of different structural branched glycerol dialkyl glycerol tetraether (bGDGT) and isoprenoid glycerol dialkyl glycerol tetraether (iGDGT), in order to establish conversion equation suitable for paleoclimate study on Qinghai-Xizang Plateau glaciers, which can provide the basis for quantitative reconstruction of plateau glacier paleoclimate. We concluded that there is clear potential to use bGDGT in cryoconites to reconstruct past terrestrial climate. Based on the distribution and concentration of sterol in cryoconites over the Qinghai-Xizang Plateau, we explored the sources of cryoconites organic matter. However, it is of great significance both for understanding terresterial organic matter or organic matter was formed in situ production.