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
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±12.6cm with all samples of SY section at Siyao port. The precision may be improved to ±10cm 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.
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.
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