Formation of the modern current system in the East China Sea since the early Holocene and its relationship with sea level and the monsoon system
文献类型：CNKI期刊论文
| 作者 | Zheng XF(郑旭峰); Li AC(李安春); Wan SM(万世明) ; Jiang FQ(蒋富清); Yin XM(尹学明); Lu J(卢健)
|
| 发表日期 | 2015-07-15 |
| 出处 | Chinese Journal of Oceanology and Limnology
 |
| 关键词 | monsoon modern current system Okinawa Trough Kuroshio Current |
| 英文摘要 | The Okinawa Trough is a natural laboratory for the study of air-sea interaction and paleoenvironmental change. It has been demonstrated that present offshore export of particles in the bottom nepheloid layer occur primarily with downwelling from the northeast winter monsoon, which is inhibited by a transverse circulation pattern in summer. This current system was very different during the Last Glacial Maximum owing to low sea level(-120 m) and exposure of a large shelf area. We collected sediment core Oki01 from the middle Okinawa Trough during 2012 using R/V K exue No. 1 to elucidate the timing and cause of the current system transition in the East China Sea. Clay mineral, dry density, and elemental(Ti, Ca) composition of core Oki01 was analyzed. The results indicate that clay minerals derived mainly from the Huanghe(Yellow) and the Changjiang(Yangtze) Rivers during 16.0–11.6 ka, and the modern current system in the East China Sea formed beginning in the early Holocene. Therefore, mixing of East China Sea continental shelf, Changjiang River and partially Taiwan Island sediment are the major contributors. The decrease of log(Ti/Ca) and alternating provenance since the early Holocene indicate less sediment from the East China in summer because of resistance of the modern current system, i.e., a "water barrier" and upwelling. Conversely, sediment delivery persists in winter and log(Ti/Ca) indicates the winter monsoon signal since the early Holocene. Our evidence also suggests that sediment from Taiwan Island could be transported by the Kuroshio Current to the middle Okinawa Trough, where it mingles with winter monsooninduced export of sediment from the Changjiang River and East China Sea continental shelf. Although the present research advances understanding of the evolutionary history of paleoenvironmental change in the Okinawa Trough, more sediment cores should be retrieved over wide areas to construct a larger scenario. |
| 文献子类 | CNKI期刊论文 |
| 资助机构 | Supported by the National Natural Science Foundation of China(Nos.41430965,41376057) ; the Strategic Priority Research Program of Chinese Academy of Sciences(No.XDA11030302) |
| 卷 | v.33期:04页:246-255 |
| 语种 | 英文; |
| 分类号 | P736.2 |
| ISSN号 | 0254-4059 |
| 源URL | [http://ir.qdio.ac.cn/handle/337002/189992]  |
| 专题 | 中国科学院海洋研究所 |
| 作者单位 | 1.KeyLaboratoryofMarginalSeaGeology,SouthChinaSeaInstituteofOceanology,ChineseAcademyofSciences 2.KeyLaboratoryofMarineGeologyandEnvironment,InstituteofOceanology,ChineseAcademyofSciences 3.UniversityofChineseAcademyofSciences |
| 推荐引用方式 GB/T 7714 | Zheng XF,Li AC,Wan SM,et al. Formation of the modern current system in the East China Sea since the early Holocene and its relationship with sea level and the monsoon system. 2015. |
入库方式： OAI收割
来源：海洋研究所
浏览0
下载0
收藏0
其他版本
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。