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  

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

作　　者：庄陈程 战庆[2] 王张华[3] 

机构地区：[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

出　　处：《古地理学报》2014年第4期557-568,共12页Journal of Palaeogeography：Chinese Edition

基　　金：国家自然科学基金项目(编号:41176070);河口海岸国家重点实验室自主课题资助

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。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 tech-nology in the past decade.It has become one of the indispensable methods in sea-level research in manywestern 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 exam-ple） based sea-level transfer functions,including tidal flat sampling strategy,statistical analysis,possi-ble 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 con-cluded that the elevation is the most contributing factor for diatoms sorting among all the environmental pa-rameters.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±1 2.6cm with all samples of SY section at Siyao port.The precision may be improved to±1 0cm when the sample from a su-pratidal 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 re-cords to aid coastal management of China.

关 键 词：微古化石 硅藻 海平面重建 转换函数 长江口 

分 类 号：P736.221[天文地球—海洋地质]