北塬剖面碳酸钙记录的末次间冰期气候不稳定性  

Climate Instability Revealed in the Beiyuan CaCO_3 Record during the Last Interglacial Age

作　　者：管东红 奚晓霞[1] 郝永萍 方小敏[1] 李吉均[1] 余丹林 

机构地区：[1]兰州大学地理科学系

出　　处：《冰川冻土》1996年第2期119-124,共6页Journal of Glaciology and Geocryology

基　　金：留学回国人员启动基金;国家自然科学基金重点资助项目

摘　　要：最近格陵兰冰芯深孔ＧＲＩＰ揭示末次间冰期早期（ＭＩＳ—５ｅ）气候急剧不稳定，但邻近的另一冰芯ＧＩＳＰ２却表明这一时期气候是稳定的。其结论对将来气候的预测是至关重要的。临夏北塬高分辨率黄土—古土壤连续ＣａＣＯ３记录表明，气候在ＭＩＳ—５ｅ期间曾发生过３次显著的温暖时期和两次明显严寒的急剧大幅度波动，与格陵兰ＧＲＩＰ孔气候记录一致。证明ＭＩＳ—５ｅ气候不稳定性是存在的，并且其影响非早先认为的局地事件。Recent Greenland deep ice core GRIP reveals the climate experinced shorh shifts duriing the early stage of the last interglacial age (MIS_5e),but the later ice core GISP2 near the GRIP drill has not demonstrated such phenomenon. It is very impotrant to make it clear for the future climate forcast, because climate change in the last interglacial age is served as an analogue for the future climate. Hare we present high resolution continuous loess_paleosol CaCO_3 record from the Beiyuan section in LinXia. Three warm periods and two serious cold periods indicate that climate experinced marked fluctuation, corelating well with the Greenlang GRIP cliimate record. It demonstrats the instability of climate existence during MIS_5e, and its influence was common at least over the north hemisphere rather than local as previously recognized.

关 键 词：碳酸钙 更新世 气候变化 不稳定性 

分 类 号：P532[天文地球—古生物学与地层学]