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首页> 外文期刊>Chinese science bulletin >Holocene climatic and environmental changes recorded in Baahar Nuur Lake core in the Ordos Plateau, Inner Mongolia of China
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Holocene climatic and environmental changes recorded in Baahar Nuur Lake core in the Ordos Plateau, Inner Mongolia of China

机译:内蒙古鄂尔多斯高原Baahar Nuur湖中心记录的全新世气候和环境变化

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摘要

A 5.3 m lake core was drilled in Baahar Nuur Lake in the Ordos Plateau, and measurements of mean grain size, organic δ~(13)C (δ~(13)C_(org)), organic carbon content (TOC), C/N, carbonate content, carbonate δ~(13)C (δ~(13)C_(car)) and δ~(18)O (δ~(18)O_(car)) were conducted for retrieving the Holocene chronosequence of climatic changes based on 15 AMS ~(14)C dates. The record documented four major stages of climate change in the Ordos Plateau: (Ⅳ) a cold and dry condition before ~7.65 ~(14)C ka BP; (Ⅲ) a warm and humid stage between ~7.65 and ~5.40 ka BP; (Ⅱ) a generally drier and cooler climate since ~5.40 ka BP with two humid events occurring from ~4.70 to ~4.60 ka BP and from ~4.20 to ~3.70 ka BP, and (Ⅰ) a dry climate characterized by complete desiccation of the lake after 3.70 ka BP. Stage Ⅲ can be further divided into three sub-stages: (Ⅲa) a warm and humid episode from ~7.65 to ~6.70 ka BP, (Ⅲb) a warm and relatively dry episode from ~6.70 to ~6.20 ka BP, and (Ⅲc) the magthermal and maghumid episode of the Holocene from ~6.20 to ~5.40 ka BP.
机译:在鄂尔多斯高原的Baahar Nuur湖中钻了一个5.3 m的湖芯,测量了平均粒径,有机δ〜(13)C(δ〜(13)C_(org)),有机碳含量(TOC),C / N进行碳酸盐含量,碳酸盐δ〜(13)C(δ〜(13)C_(car))和δ〜(18)O(δ〜(18)O_(car))的反演。基于15个AMS〜(14)C日期的气候变化。记录记载了鄂尔多斯高原气候变化的四个主要阶段:(Ⅳ)〜7.65〜(14)C ka BP之前的寒冷干燥状态; (Ⅲ)在〜7.65 ~~ 5.40 ka BP之间的暖湿阶段; (Ⅱ)〜5.40 ka BP以来较干燥和较凉爽的气候,在〜4.70 ~~ 4.60 ka BP和〜4.20 ~~ 3.70 ka BP出现了两个湿润事件,(Ⅰ)干燥的气候特征3.70 ka BP后的湖泊。阶段Ⅲ可进一步分为三个子阶段:(Ⅲa)〜7.65 ka ~~ 6.70 ka BP的温暖湿润;(Ⅲb)〜6.70 ~~ 6.20 ka BP的暖和相对干燥;以及(Ⅲc) )全新世的磁热和湿润事件在〜6.20 ~~ 5.40 ka BP。

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