Holocene Monsoon Change and Abrupt Events on the Western Chinese Loess Plateau as Revealed by Accurately Dated Stalagmites
Holocene Monsoon Change and Abrupt Events on the Western Chinese Loess Plateau as Revealed by Accurately Dated Stalagmites
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DOI：
10.1029/2020gl090273
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发表时间：
2020-11
影响因子：
5.2
通讯作者：
L. Tan;Yanzhen Li;Xiqian Wang;Yanjun Cai;F. Lin;Hai Cheng;Le Ma;A. Sinha;R. Edwards
中科院分区：
文献类型：
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作者：
L. Tan;Yanzhen Li;Xiqian Wang;Yanjun Cai;F. Lin;Hai Cheng;Le Ma;A. Sinha;R. Edwards
在这里，我们提出，到目前为止，最高分辨率（~5年）和最精确的年代测定中国西部黄土高原全新世季风气候重建基于五个复制的石笋δ 18 O记录，中国甘肃东部的无涯洞。我们的记录表明，该地区最潮湿的时期发生在10,500至6,600年BP之间。在这一时期之后，亚洲夏季风年代际尺度变率的振幅逐渐增加，可能是对中全新世以来ENSO频率增加的响应。我们的研究揭示了中国西部黄土高原8.2，5.5和2.8 ka事件的相似的不对称百年尺度双倾结构，这表明太阳活动的影响可能在8.2 ka BP左右被融水洪水放大。相反，4.2 ka事件显示季风降水逐渐减少，具有百年至十年尺度的波动。
Here we present, to date, the highest‐resolved (~5 years) and most precisely dated Holocene monsoon climate reconstruction for the western Chinese Loess Plateau based on five replicated stalagmite δ18O records from Wuya Cave, eastern Gansu, China. Our record suggests the wettest period occurred between 10,500 and 6,600 a BP in this region. After this period, the amplitude of Asian summer monsoon decadal‐scale variability progressively increased likely in response to increasing ENSO frequency since the middle Holocene. Our study reveals similar asymmetric centennial‐scale double‐plunging structures of the 8.2, 5.5, and 2.8 ka events in the western Chinese Loess Plateau, suggesting a possible role of solar activity whose impact was amplified around 8.2 ka BP by the meltwater flood. In contrast, the 4.2 ka event exhibit gradually declining monsoon rainfall with centennial‐ to decadal‐scale fluctuations.