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首页> 外文期刊>Journal of Asian earth sciences >Lateral sediment transport and late Quaternary changes of eolian sedimentation in the East Sea (Japan Sea)
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Lateral sediment transport and late Quaternary changes of eolian sedimentation in the East Sea (Japan Sea)

机译：东海中东安沉积物横向沉积物及晚期季度变化

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We investigated grain size records of a sediment core (05-P21) from the South Korea Plateau in the East Sea, located ca. 270 km east of the east coast of the Korean Peninsula. To verify an exclusive eolian origin for the detrital components of the sediments, we first examined how far offshore lateral-sediment-transport contributions from the eastern margin of the Korean Peninsula could reach, based on spatial changes in the grain size distribution (GSD) of surface sediments. To distinguish grain populations representing different transport processes, we performed end-member analyses (EMAs) of the GSDs of detrital fractions using the AnalySize software. EMA of the surface sediment GSDs showed that they consist of three end-member (EM) grain populations representing contributions from lateral (EM1 and EM2) and eolian transport (EM3). EM contributions by lateral transport reached only ca. 70 km seaward, confirming the exclusive eolian origin of detrital components of the 05-P21 core sediments. EMA of GSDs of the 05-P21 sediments distinguished two EM grain populations with fine (3.6 mu m) and coarse (9.5 mu m) median sizes, suggesting transport by upper westerlies and winter monsoon northwesterly surface winds, respectively. Variation in the proportions of fine and coarse EMs since ca. 186 ka indicated controls by both orbital and sub-orbital scale changes in intensity of the East Asian winter monsoon in association with global ice volume changes and Dansgaard-Oeschger cycles.
机译：我们调查了来自东海的韩国高原的沉积物核心（05-P21）的粒度记录，位于东海，位于CA.朝鲜海岸东海岸以东270公里。为了验证沉积物的堕落组件的独家Eolian来源，我们首先检查了朝鲜半岛东部边缘的离岸侧泥土运输贡献，基于谷物尺寸分布（GSD）的空间变化，可以达到朝鲜半岛的东部边缘表面沉积物。区分代表不同传输过程的谷物群体，我们使用分析软件对脱曲线组成部分的GSDS的最终成员分析（EMAS）进行了。表面沉积物GSD的EMA表明，它们由三个末端（EM）谷物群组成，代表横向（EM1和EM2）和Eolian运输（EM3）的贡献。侧向运输的EM贡献只达到了CA. 70公里的海，确认了05-P21核心沉积物的独家Eolian源。 05-P21沉积物的GSD的EMA占用了两种EM谷物群，浓郁（3.6亩）和粗（9.5亩）中位数，建议上游和冬季季风的冬季季风北部的地表风。自加利夫以来精细和粗胚的比例的变化。 186 KA指出的控制通过轨道和亚轨道规模的轨道和亚轨道规模与全球冰量变化和Dansgaard-Oeschger周期相关联的东亚冬季季风的强度。

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