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Recent 2000-year geological records of mud in the inner shelf of the East China Sea and their climatic implications

机译：东海内陆架近2000年的泥浆地质记录及其气候意义

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摘要

AMS14C dating and grain-size analysis for Core BB2, located at the north of the Yangtze River-derived mud off the Zhejiang-Fujian coasts in the inner shelf of the East China Sea, provide us a high-resolution grain-size distribution curve varying with depth and time. Data in the upper mud layer of Core DD2 indicate that there are at least 9 abrupt grain-size increasing in recent 2000 years, with each corresponding very well with the low-temperature events in Chinese history, which might result from the periodical strengthening of the East Asian Winter Monsoon (EAWM), including the first-revealed maximum temperature lowering event at around 990 a BP. At the same time, the finer grain size section in Core DD2 agrees well with the Sui-Tang Warming Period (600-1000 a AD) defined previously by Zhu Kezhen, during which the climate had a warm, cold and warm fluctuation, with a dominated cooling period of 750 850 a AD. The Little Ice Age (LIA) can also be identified in the core. It starts around 1450 a AD and was followed by a subsequent cooling events at 1510, 1670 and 1840 a AD. Timing of these cold events revealed here still needs to be further verified owing to some current uncertainty of dating we used in this study.
机译：BB2岩心的AMS14C测年和粒度分析位于东海内陆浙-福建沿海长江源性泥浆的北部，为我们提供了变化的高分辨率粒度分布曲线与深度和时间。 DD2核心上部泥层的数据表明，在最近的2000年中，至少有9个突然的晶粒尺寸增加，每个都与中国历史上的低温事件很好地对应，这可能是由于周期性地强化东亚冬季风（EAWM），包括首次揭示的最高温度降低事件，大约990 BP。同时，DD2岩心中较细的粒度段与朱克zhen先前定义的隋唐增温期（公元600-1000 a）相吻合，在此期间气候呈温暖，寒冷和温暖的波动，公元750850年的主要冷却时间。小冰河世纪（LIA）也可以在核心中识别出来。它开始于公元1450年左右，随后在公元1510、1670和1840年发生随后的冷却事件。由于我们在这项研究中使用的当前约会的一些不确定性，这里揭示的这些寒冷事件的时间仍然需要进一步验证。

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