【作者】 王俊；

【导师】 李秉成；

【作者基本信息】 长安大学 ， 第四纪地质学， 2014， 硕士

【摘要】 现代气候环境的重要性在日益发展的人类社会中越来越突出，自工业革命以来，大量温室气体的排放导致全球气候变暖已成为不争的事实，IPCC第四次评估报告指出未来气候将持续变暖。在全球气候环境逐渐恶化的背景下，全球气候环境变化研究成为了全人类的重大课题，要全面的了解现代气候环境的变化机制和预测未来气候环境变化的发展，对于过去气候环境的研究是必不可少的。全新世气候研究一直以来都是气候变化研究的热点，因为距今仅仅10ka左右的全新世作为地球历史中最新的一页，期间气候的波动性和周期性与人类的演化和发展密切相关。现代气候是全新世气候的发展和延续，有关证据显示在全新世晚期本应进入降温阶段，而人为因素的影响导致全球气温不降反升，究竟未来气候环境怎样变化还有待于更多科学研究的证明。西安南部地区地处秦岭边缘，北临黄土高原，区域内发育着多个由黄土和古土壤旋回覆盖而成的黄土台塬。这些黄土台塬具有沉积连续、层位稳定、界限分明、年代分辨率较高等特点，比较完整地记录了该地区全新世以来的古气候环境变化信息。为了进一步探讨西安南部地区全新世以来古气候环境的变化规律，通过西安何家营村全新世黄土剖面的地层岩性描述，运用磁化率年龄模型确定地层年代序列，根据所采样品的磁化率值绘制磁化率曲线来定性分析全新世气候变化；然后运用吕厚远等人提出的回归方程定量计算全新世以来该地区古温度、古降水，同时选取其他学者所建立的气候曲线进行对比，将西安地区全新世气候划分为5个阶段：10～8.5kaBP，冷暖转换阶段；8.5～7kaBP，大暖期冷暖波动阶段；7～5kaBP，大暖期鼎盛阶段；5～3.4kaBP，大暖期温度波动暖和阶段；3.4kaBP至今，气温先下降后稳定阶段。更多还原

【Abstract】 The importance of modern climate environment is becoming more and moreoutstanding in the development of human society, since the industrial revolution, alarge number of greenhouse gas emissions leading to global warming had become anindisputable fact, the IPCC fourth assessment report pointed out that the climate wasgoing to keep on warming in the future. Under the background of global climate andenvironment gets deteriorating, global climate and environment variation research hasbecome the major task of all mankind, if we want to fully understand the change ofmodern environmental mechanism and to predict the future development of climatechange, more researches on ancient climate environment is indispensable.The Holocene climate research has long been the hot spot of climate changestudies, because Holocene ten thousand years ago as the last page in the history of theearth, the volatility and periodicity of climate during this period is closely related tothe evolution and development of human. Modern climate is the development andcontinuation of the Holocene climate, relevant evidence shows that temperatureshould fall in late Holocene, but the influence of human factors lead to globalwarming, which aspect the future climate and environment will change to need morescientific proof.Southern Xi ’an area is located in the edge of Qinling, Bordering on the LoessPlateau, there are many loess hills composed of loess and paleosol cycle cover in thisarea. This loess hill sequential deposition, stable horizon, obvious boundary, high ageresolution, taken down the climate and environment changing information from theHolocene completely. In order to further explore the change rule of the paleoclimateenvironment since Holocene, through the Holocene loess profile in Xi an He Jiaying,describe the stratum lithology, using magnetic susceptibility age model to determinechronostratigraphic sequence, with the Magnetic susceptibility curve drew bymagnetic susceptibility values of samples to qualitative analyze the Holocene climatechange. Then using regression equation put forward by Lv et al.to quantitativecalculate the holocene ancient temperature and precipitation in this area. Meanwhile we selected other scholars climate curves for comparison, the Holocene climate inXi’an region is divied into5stages:10~8.5kaBP, changes in temperaturetransformation stage;8.5~7kaBP, Megathemal changes in temperature fluctuationstage;7~5kaBP, Megathemal maximum;5~3.4kaBP, Megathemal warm temperaturefluctuation stage; After3.4kaBP up to now, the temperature droped first thenstabilized stage.更多还原