| YE Liangtao,YU Ge,LIAO Mengna,LI Yongfei. 2016. Dynamic simulations of the late MIS 3 transgressions in the East China Sea and southern Yellow Sea, China. Acta Oceanologica Sinica, 35(10):48－55 |
| Dynamic simulations of the late MIS 3 transgressions in the East China Sea and southern Yellow Sea, China |
| 中国东海和南黄海沿海平原MIS 3晚期海侵层的动力模拟研究 |
| Received:December 20, 2015 Revised:May 05, 2016 |
| DOI：10.1007/s13131-016-0919-5 |
| Key words:marine transgression late MIS 3 dynamic simulation sea level change |
| 中文关键词: 海侵 MIS 3晚期 动力模拟 海面变化 |
| 基金项目: |
| Author Name | Affiliation | E-mail | | YE Liangtao | Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China
University of Chinese Academy of Sciences, Beijing 100049, China | | | YU Ge | Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China | geyu@niglas.ac.cn | | LIAO Mengna | Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China | | | LI Yongfei | Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China | |
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| Abstract: |
| Abundant evidences of higher sea levels from Jiangsu and Fujian coasts have proved a marine transgression event during 30-40 ka BP, suggesting that there was a stage with high sea level and a warm climate when ice sheets shrank in the Northern Hemisphere. The duration of 30-40 ka BP spanned a period in the late Marine Isotope Stage 3 (MIS 3) and was in nature an interstadial epoch during the Last Glacial period of the Quaternary. Different from the glacial period with a cold climate, this marine transgression considered as a penultimate higher sea level during the Quaternary remains a puzzle that why the evidence is contrary to the Quaternary glacial theory. It is important to understand sea level rise for these areas sensitively responding to the global changes in the future. To recognize the key issues on sea level changes, the eustatic sea level (HS) was defined as the glaciation-climate-forced sea levels, and the relative sea level change (HR) was defined as that a sea level record was preserved in sediment that experienced multiple secondary actions of land and sea effects. On the basis as defined above, we constructed multi-level models of climate-driven glacio-eustatic changes and land-sea systems. By integrating data sets from eight borehole cores and prescribing the boundary conditions, we simulated the changes of HS and HR in the East China Sea and southern Yellow Sea areas in the late MIS 3. The marine transgression strata from the borehole core data was identified at ca. 30 m below present sea level as a result of the collective influence of ice melting water, neotectonic subsidence, sediment compaction and terrestrial sediment filling since ca. 35 ka ago, whereas the simulated relative sea-levels turned out to be-26.3--29.9 m a.s.l. The small error involved in the simulation results of ±(2.5-4.5) m demonstrated the credibility of the results. Our results indicated that sea level change in the late MIS 3 was dominated by glacial effects, in which the eustatic sea-level was between-19.2--22.1 m a.s.l. The study sheds light on the nature of sea-level changes along the east coast of China in the late MIS 3 and contributes to understanding the characteristics of marine transgression under the effects of multiple complex land-sea interactions. |
| 中文摘要: |
| 江苏和福建沿海平原钻孔记录证实在30-40 ka BP期间发生了一次海侵事件，表明该时期在北半球冰盖出现退缩，同时具有高海面和暖湿气候特征。30-40 ka BP相当于海洋氧同位素3阶段（MIS 3），北半球处于第四纪末次冰期中的间冰阶。不同于冰期的寒冷气候特征，该高海面事件带来困惑是：“为什么在冰期会发生海侵事件？”。为了更好地认识MIS 3晚期海面变化下海侵层特征、后期沉积变化以及复杂动力效应，本文在分别定义冰川型海面（HS）和相对海面（HR）为冰川-气候驱动海面和保存在沉积物记录中海面高度的基础上，构建了气候驱动冰川型海面变化和陆海系统响应多层次模型，对福建和江苏沿海MIS 3晚期的气候驱动的海侵层进行模拟，模拟结果与8个收集的区域钻孔数据进行对比。模拟结果表明，MIS 3晚期海面变化主要由冰川型控制，该时期在东海和南黄海由气候－冰川驱动的海面高度在-19.2--22.2 m a.s.l.，相对海面高度在-26.3--29.9 m a.s.l.。模拟相对海面的结果在8个典型钻孔的海侵层位上进行对比，误差在±（2.5-4.5）m，表明模拟结果可靠。本研究对认识多重海陆升降复杂效应作用下的海侵层特征，揭示东海和南黄海MIS 3晚期海面变化的性质有重要意义。 |
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