贾耀锋,黄春长,庞奖励,毛龙江

• 1:北方民族大学管理学院
• 2:陕西师范大学旅游与环境学院
• 3:南京信息工程大学大气科学学院

摘要(Abstract)：

通过对位于渭河流域东部的老官台黄土-土壤剖面多气候代用指标的测定,结合野外考察和地层沉积特征分析,揭示了本区气候自末次冰消期以来发生了多期波动和突变事件。14.91～12.45kaB.P.期间本区气候以冷干为主,且在12.45 kaB.P.前后气候最为冷干。12.45～9.34kaB.P.期间表现为快速升温、降水明显增多的变化特点;并在10.38 kaB.P.记录了一期明显的气候突变事件,表现为突然变冷并伴随降水变率的增大,在这种气候背景下发生了显著的坡面侵蚀再沉积过程。9.34～6.77kaB.P.期间,本区气候为全新世以来温度最高、降水最多的最适宜期;其中在8.74～7.94kaB.P.期间发生了气候变冷事件。6.77～5.48kaB.P.期间为全新世大暖期以来气候最为冷干时期。5.48～3.12kaB.P.期间温度有所回升、降水增多,但温湿程度不如9.34～6.77kaB.P.的气候最适宜期;其中4.60～3.76kaB.P.之间在气候趋于变冷的过程中,降水变率较大导致了坡面侵蚀再沉积事件,这对应于夏代前期的洪水多发时期。3.12aB.P.以来,本区气候再次向温度降低、降水量减小的方向变化。

关键词(KeyWords)： 渭河流域;末次冰消期;黄土;代用指标;气候变化

Abstract:

Keywords:

基金项目(Foundation): 国家自然基金项目(No.40771018;40801008)资助

作者(Author): 贾耀锋,黄春长,庞奖励,毛龙江

DOI: 10.13448/j.cnki.jalre.2011.11.034

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