Holocene climatic change revealed by aeolian deposits from the Gonghe Basin, northeastern Qinghai–Tibetan Plateau
Holocene climatic change revealed by aeolian deposits from the Gonghe Basin, northeastern Qinghai–Tibetan Plateau
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DOI：
10.1016/j.quaint.2012.05.003
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发表时间：
2013-05
影响因子：
2.2
通讯作者：
Bing Liu;He-ling Jin;Liangying Sun;Zhong Sun;Z. Su;Caixia Zhang
中科院分区：
文献类型：
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作者：
Bing Liu;He-ling Jin;Liangying Sun;Zhong Sun;Z. Su;Caixia Zhang
90米风成沉积物。根据沉积相、磁化率、总有机碳（TOC）含量、粒度、地球化学参数等指标的变化，该区气候演化可划分为以下几个阶段：11.8 ~ 10.1 ka为干冷期，可能与全新世之前的新仙女木事件有关。10.1 ~ 8.7 ka为气候相对温暖湿润的最佳时期。8.7 ~ 4.7 ka期间气候趋于相对干燥，但古土壤发育弱（弱发育）。这与全新世的大暖极大期或全新世最佳期不一致。4.7 ~ 0.7 ka出现了相对温暖湿润的气候，0.7 ka以后出现了明显的寒冷干燥期。此后，区域气候变暖。此外，还记录了8个冷事件，包括YD事件（约11.8 ka）、9.8 ~ 9.5 ka、9.2 ~ 8.7 ka、8.1 ~ 7.6 ka、7.0 ~ 6.1 ka、5.3 ~ 4.7 ka、3.1 ~ 1.5 ka和0.7 ka以后的冷事件。
A climate record for the Gonghe Basin in the northeastern Qinghai–Tibetan Plateau during the Holocene period was determined from a 3.90 m aeolian deposit. As revealed by the variation of proxies, including sedimentary facies, magnetic susceptibility, the total organic carbon (TOC) content, grain size, and geochemical parameters, the regional climatic evolution during this period can be divided into the following stages. There was a cold and dry phase in 11.8–10.1 ka, probably related to the Younger Dryas (YD) event prior to the Holocene. An optimum stage with relatively warmer and wetter climate dominated the region between 10.1 ka and 8.7 ka. The climate tended to relatively dry condition from 8.7 ka to 4.7 ka, although weak paleosol (weakly developed paleosol) developed during this period. This is inconsistent with the Megathermal Maximum in the Holocene or Holocene Optimum. A relatively warm and wet climate emerged in 4.7–0.7 ka, and an obviously cold and dry stage emerged since 0.7 ka. Thereafter, the regional climate became warmer. In addition, eight cold events were recorded, including the YD event (around 11.8 ka), 9.8–9.5 ka, 9.2–8.7 ka, 8.1–7.6 ka, 7.0–6.1 ka, 5.3–4.7 ka, 3.1–1.5 ka, and since 0.7 ka. These events are coincident with cold phases revealed by aeolian depositions and lake records in the northeastern Qinghai–Tibetan Plateau, and also with the evidence of deteriorated climate phases in the high and low latitudes of the Northern Hemisphere on a millennial scale, such as in Hongyuan peat and drift-ice tracers in the North Atlantic Ocean in the Holocene.