Sensitive grain-size records of Holocene East Asian summer monsoon in sediments of northern South China Sea slope
Sensitive grain-size records of Holocene East Asian summer monsoon in sediments of northern South China Sea slope
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DOI：
10.1016/j.yqres.2011.03.002
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发表时间：
2011-05
影响因子：
2.3
通讯作者：
Jie Huang;Anchun Li;S. Wan
中科院分区：
文献类型：
--
作者：
Jie Huang;Anchun Li;S. Wan
南海北方陆坡KNG 5孔高分辨率粘土矿物学和粒度记录了近17,500年来的古环境变化。研究结果表明，17，500 ~ 12，500 cal yr BP时，粘土矿物主要来自珠江，12，500 cal yr BP后，南海现代海流体系开始形成，12，500 cal yr BP后，台湾成为粘土矿物的主要贡献者。在13-28 μm和1-2.2 μm两个粒度区间内，发现了两个随时间变化较大的粒度群体。1-2.2 μm粒度的种群主要受物源供给和水流搬运的控制。13-28 μm的粒度组分主要受海平面变化的控制。1-2.2 μm粒度的总体记录表明，东亚夏季风强度一般随太阳辐射的变化而变化，中国大部分地区的响应与其他北方低纬记录相似，暗示了全新世以来季风演化的全球性。南海北方异常的环境条件可能意味着晚全新世ENSO活动的加强。
Changes in paleoenvironments over the last 17,500 yr have been documented by a high-resolution clay mineralogy and grain–size records of Core KNG5 from the northern slope of the South China Sea. Our results indicate that clay minerals are mainly from the Pearl River from 17,500 to 12,500 cal yr BP, and the South China Sea modern current system began to form since 12,500 cal yr BP, as a result, Taiwan turns to be the major contributor of clay minerals after 12,500 cal yr BP. Two grain-size populations with high variability through time were identified in the 13–28 μm and 1–2.2 μm grain-size intervals. The 1–2.2 μm grain-size population are mainly controlled by provenance supply and current transport. The 13–28 μm grain-size fraction could be controlled mainly by the sea-level change. The 1–2.2 μm grain-size population record demonstrates that East Asian Summer Monsoon intensity generally follows changes in insolation and that the response is similar for a large area of China and other northern low-latitude records, implying the globality of the monsoon evolution since Holocene. The anomalous environmental conditions in the northern South China Sea may imply intensified ENSO activity during the late Holocene.