黄河源头地区湖泊沉积物记录的全新世温度变化及水热关系

黄河源头位于青藏高原东部边缘地带，是我国西北乃至华北地区重要的水资源中心。在全球持续增温背景下，该区河流径流和湖泊水文对温度变化的响应引起研究者的广泛关注。受气象-水文站点较少和器测资料过短等因素的制约，该区河流和湖泊水文变化对气候响应的认识可能不尽全面，有必要进行更长时间尺度上深入研究。本项目选取黄河上游过水湖泊-鄂陵湖为研究区域，以该湖全新世以来的沉积物为研究对象。分析沉积物岩心中碳酸盐耦合同位素组成和氧同位素组成，分别建立黄河源头地区全新世以来的温度序列和黄河源头径流量的变化序列。通过分析黄河源头全新世以来的温度和黄河径流量（降水）特征，探讨黄河源头地区全新世大暖期和中世纪暖期温度和黄河径流量的变化特征、差异、相互关系和驱动机制，有望为全球变暖条件下该区降水或黄河径流量演化研究提供重要的、关键性证据，同时为该区可持续发展要求的水资源配置规划提供科学依据。

The headwater areas of Yellow River, located on the northeastern Tibetan Plateau, is one of the major water resources for west China and even large part of north China. On the background of global warming, the increased temperature and its effect on hydrological variation in rivers and lakes for the upper Yellow River has been widely carried out. However, the knowledge about the hydrological variation in rivers (runoff) and lakes, and their responses to climate change might be nit comprehensive because the instrumental records is very limited and shorter in this region. The study like this on the long time scale is very necessary. Therefore, our study is aimed to respectively quantity variation in temperature and qualitatively reconstruct river runoff changes in using clumped isotope and oxygen isotope of carbonates in sedimentary core from Lake Erling covering the Holocene on the upper reaches of Yellow River. On this base, the varied characteristic of temperature and river runoff (precipitation) should be examined to evaluate characteristic of varied temperature and river runoff, their differences, relationship and driving mechanism in warm periods like climatic optimum in the Holocene and Medieval Warm Period in the upper reaches of Yellow River. The result of this study should provide very important clue to study the evolution of precipitation or river runoff on the background of global warming, and also provide scientific reference for water resources optimal allocation on this region.