利用长江口现代潮滩沉积硅藻建立海平面转换函数的尝试

doi:10.7605/gdlxb.2014.04.046

古地理学报 ›› 2014, Vol. 16 ›› Issue (4): 557-568. doi: 10.7605/gdlxb.2014.04.046

• 第四纪古地理学、沉积学和古气候学 • 上一篇

利用长江口现代潮滩沉积硅藻建立海平面转换函数的尝试

庄陈程¹, 战庆², 王张华³

1 华东师范大学资源与环境科学学院,上海 200062
2 上海市地质调查研究院,上海 200072
3 华东师范大学河口海岸国家重点实验室,上海 200062

收稿日期:2012-03-06 修回日期:2013-05-10 出版日期:2014-08-01 发布日期:2014-08-01
通讯作者: 王张华,女,1973年生,博士,教授,主要研究方向为河口三角洲沉积地貌环境演变。E-mail:zhwang@geo.ecnu.edu.cn。
作者简介:庄陈程,男,1986年生,硕士研究生,主要从事定量海平面重建研究。E-mail:zhuangchen2000@163.com。
基金资助:
国家自然科学基金项目(编号:41176070)和河口海岸国家重点实验室自主课题资助

An attempt on construction of diatom-based sea-level transfer functions in modern tidal flat at Yangtze River estuary

Zhuang Chencheng¹, Zhan Qing², Wang Zhanghua³

1 College of Resources and Environmental Science,East China Normal University,Shanghai 200062
2 Shanghai Institute of Geological Survey, Shanghai 200072
3 State Key Laboratory of Estuarine and Coastal Research,East China Normal University,Shanghai 200062

Received:2012-03-06 Revised:2013-05-10 Online:2014-08-01 Published:2014-08-01
Contact: Wang Zhanghua,born in 1973,is a professor of East China Normal University. She is mainly engaged in research on sedimentary geomorphologic evolution of estuary and delta. E-mail: zhwang@geo.ecnu.edu.cn.
About author:Zhuang Chencheng,born in 1986,is a postgraduate of East China Normal University(Shanghai). Now he is engaged in research on quantitative sea-level reconstruction. E-mail:zhuangchen2000@163.com.

摘要/Abstract

摘要：

在高精度海平面定量重建研究中,有孔虫、硅藻等海洋微体古生物转换函数技术是近10余年随着计算机技术发展而快速兴起的一项新技术,已成为欧美地区研究海平面变化的不可或缺的定量手段之一,而其在中国沿海地区全新世海平面定量重建中的应用却屈指可数。以硅藻为例,详细介绍了建立其与海平面之间的转换函数的过程,包括现代表层样采集、统计学分析、误差的可能来源和减小误差的方法。通过在对崇明岛四滧港SY剖面潮滩表层样品的环境因子分析和对硅藻属种的CCA排序分析发现,高程对潮滩硅藻属种排序有着很高的解释贡献。随后通过WA和WA-PLS建立模型,四滧港SY剖面全样WA-PLS模型的相关系数(R²_Jack)达到0.9004,预期误差(RMSEP)为12.622,若不考虑潮上带样品SY1后的转换模型其精度更能达到±10cm。本研究以期带动此项技术在国内的发展,促进高精度海平面定量重建,从而能为沿海地区海岸带管理提供更详实、更具现实指导意义的地质记录。

关键词: 微古化石, 硅藻, 海平面重建, 转换函数, 长江口

Abstract:

In the research on quantitative high-resolution sea-level reconstruction,microfossil-based transfer function is a newly and rapidly developed technique assisted by the development of computer technology in the past decade. It has become one of the indispensable methods in sea-level research in many western countries. However,its application to reconstructions of the Holocene relative sea-level history in Chinese coasts has been limited. This paper intends to introduce the method of the diatom(as an example)based sea-level transfer functions,including tidal flat sampling strategy,statistical analysis, possible prediction errors and reducing-error method. Through analyzing the tidal flat surface samples collected from SY section at Siyao port of Chongming Island and the CCA ordination of diatom species,it was concluded that the elevation is the most contributing factor for diatoms sorting among all the environmental parameters. Thus,a transfer function with weighted average(WA)and weighted average partial least squares(WA-PLS) was used. The correlation(R²_Jack)is 0.9 and the RMSEP is±12.6cm with all samples of SY section at Siyao port. The precision may be improved to ±10cm when the sample from a supratidal site(sample of SY1)is excluded. This research will push such quantitative methods forwards to a higher level in high-resolution sea-level reconstructions that can help produce high-quality geological records to aid coastal management of China.

Key words: microfossil, diatoms, sea-level reconstruction, transfer function, Yangtze River estuary

中图分类号:

P736.22+1

庄陈程, 战庆, 王张华. 利用长江口现代潮滩沉积硅藻建立海平面转换函数的尝试[J]. 古地理学报, 2014, 16(4): 557-568.

Zhuang Chencheng, Zhan Qing, Wang Zhanghua. An attempt on construction of diatom-based sea-level transfer functions in modern tidal flat at Yangtze River estuary[J]. JOPC, 2014, 16(4): 557-568.

http://www.gdlxb.cn/CN/Y2014/V16/I4/557

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