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内蒙古自治区克什克腾旗达里湖孢粉数据集(距今12000年至今)

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国家地球系统科学数据中心2023-05-06 更新2024-03-04 收录
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内蒙古达里湖DL04岩芯高分辨率孢粉记录揭示了全新世湖区植被演替和气候变化历史。12.0–8.3 ka,湖区沙地景观由荒漠转为榆树疏林和灌丛,高原为干草原,山地桦林发育;8.3–6.0 ka,沙地榆林广布,高原转为典型草原,山地针阔混交林扩张;6.0 ka 至今,沙地发育灌丛,高原退化为干草原,山地森林收缩。孢粉证据表明东亚夏季风直至中全新世才开始增强, 不支持季风降水在早全新世增加的观点; 早全新世降水少可归因于北半球高纬残存冰盖和相对较低的全球海平面等边界条件的影响。

High-resolution palynological record from sediment core DL04 of Dali Nur, Inner Mongolia, reveals the history of vegetation succession and climate change in the lake region during the Holocene. During 12.0–8.3 ka, the sandy landscape in the area transformed from desert to elm sparse woodland and shrubland, the plateau was covered by dry steppe, and birch forests developed in the mountainous zones. During 8.3–6.0 ka, elm woodlands became widely distributed in the sandy areas, the plateau shifted to typical steppe, and mixed coniferous and broad-leaved forests expanded in the mountains. Since 6.0 ka, shrublands have developed in the sandy regions, the plateau degraded to dry steppe, and mountain forests have contracted. Palynological evidence indicates that the East Asian summer monsoon (EASM) did not intensify until the mid-Holocene, which does not support the viewpoint that monsoon precipitation increased during the early Holocene; the low precipitation in the early Holocene can be attributed to boundary conditions such as residual Northern Hemisphere high-latitude ice sheets and relatively low global sea level.
创建时间:
2023-05-06
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