Early Holocene tidal flat evolution in a western embayment of East China Sea, in response to sea level rise episodes
Early Holocene tidal flat evolution in a western embayment of East China Sea, in response to sea level rise episodes
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东海西部海湾全新世早期潮坪演化对海平面上升事件的响应
DOI：
10.1016/j.quascirev.2020.106642
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发表时间：
2020-12
影响因子：
4
通讯作者：
Zhang Yongzhan
中科院分区：
文献类型：
--
作者：
Yan Dada;Wünnemann Bernd;Gao Shu;Zhang Yongzhan
中国位于长江口至杭州湾之间的东中国海沿岸潮滩，与末次冰盛期以来的泥沙输移/扩散和海平面变化密切相关，几十年来一直是一个严谨的研究课题。在这里，我们集中讨论了以前海洋影响最西端的潮滩对全新世早期海平面上升的响应。利用杭州北部两个沉积岩芯和一个考古遗址的沉积物成分、介形类、矿物、有机质和碳酸盐含量，结合端元模拟分析和主成分分析，得出了杭州北部前海相影响西界附近的一处考古遗址。这些地点的潮滩对全新世早期的地形变化和海平面变化非常敏感。我们的数据显示了潮坪形成的两个主要阶段：i)早期形成阶段(9.5-8.0ka BP)，沉积物供应较少，平均相对海平面上升(MRSL)相对缓慢；ii)扩张阶段，沉积物供应增加，风暴发生，沉积过程快速(8.0-7.5ka BP)，MRSL强烈上升，接近现在的水平。在最后几次发作(7.6-7.5ka BP)中，记录到MRSL的静止/下降。这些推论与之前发布的局部到区域海平面曲线相符，但与全球和模拟的区域海平面曲线不同。我们认为这与全新世早期不稳定的气候条件、风暴事件的加强和夏季风降水的较强变化有关，这些因素影响了9.5-7.6ka BP之间东中国海内陆架的河流流量和相关的泥沙输送。潮汐淹没海湾湾头区的沉积序列对海平面上升事件及相关气候变化十分敏感。
The tidal flat in the coastal region of the East China Sea between the Yangtze estuary and Hangzhou Bay in China, interlinked with sediment transport/dispersal and sea level changes since the Last Glacial Maximum, has been a matter of rigorous research for decades. Here we focused on the evolution of the tidal flat at the westernmost extend of former marine influence in response to early Holocene sea level rise. We used sediment composition, ostracods, minerals, organic matter and carbonate contents in combination with endmember modelling analyses and principal component analysis from two sediment cores and an archaeological site close to the western boundary of former marine influence north of the Hangzhou city. The tidal flats at these sites were very sensitive to morphological changes and to sea level variation during the early Holocene. Our data show two major phases of tidal flat formation: i) an early formation stage (9.5–8.0 cal ka BP) with low sediment supply and related slow-down of the mean relative sea level rise (MRSL), followed by ii) the expansion phase with increased sediment supply, storm occurrence as well as fast depositional processes (8.0–7.5 cal ka BP) under a strong MRSL rise close to its present level. A stillstand/decline of MRSL was recorded for the last episodes (7.6–7.5 cal ka BP). The inferences match previously published local to regional sea level curves but differ from the global and modelled regional ones. We propose a connection with early Holocene unstable climatic conditions with intensified storm events and stronger variations in summer monsoon rainfall that affected river discharge and related sediment transport to the inner shelf of the East China Sea between 9.5 and 7.6 cal ka BP. Sedimentary sequences of bayhead areas in tidally-drowned coastal embayments are sensitive to sea level rise episodes and the relevant climate changes.
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影响因子：
2.3
作者：
Zhongbo Wang;Shouye Yang;Qiang Wang;Zhixun Zhang;Xun-hua Zhang;Xianhong Lan;Ri-hui Li;Long Huang-Long
通讯作者：
Zhongbo Wang;Shouye Yang;Qiang Wang;Zhixun Zhang;Xun-hua Zhang;Xianhong Lan;Ri-hui Li;Long Huang-Long
东海内陆架悬浮颗粒物分布及跨锋输送
影响因子：
2.3
作者：
Shidong Liu;Lulu Qiao;Guangxue Li;Jianchao Li;Nan Wang;Jichao Yang
通讯作者：
Jichao Yang
影响因子：
2.9
作者：
D. Fan;Junbiao Tu;Shuai Shang;Guofu Cai
通讯作者：
D. Fan;Junbiao Tu;Shuai Shang;Guofu Cai
影响因子：
4.4
作者：
M. Blaauw;J. Christen
通讯作者：
M. Blaauw;J. Christen
影响因子：
2.3
作者：
Zhanghua Wang;Qing Zhan;Haiyan Long;Y. Saito;Xiaoqin Gao;Xuxu Wu;Lin Li;Yanan Zhao
通讯作者：
Zhanghua Wang;Qing Zhan;Haiyan Long;Y. Saito;Xiaoqin Gao;Xuxu Wu;Lin Li;Yanan Zhao