DOI: 10.1016/j.palaeo.2014.03.008
论文题名: Diatom distributions in northern North Pacific surface sediments and their relationship to modern environmental variables
作者: Ren J. ; Gersonde R. ; Esper O. ; Sancetta C.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2014
卷: 402 起始页码: 81
结束页码: 103
语种: 英语
英文关键词: Canonical correspondence analysis
; Diatoms
; North Pacific
; Sea ice
; Summer sea surface temperature
; Surface sediments
英文摘要: In order to map the modern distribution of diatoms and to establish a reliable reference data set for paleoenvironmental reconstruction in the northern North Pacific, a new data set including the relative abundance of diatom species preserved in a total of 422 surface sediments was generated, which covers a broad range of environmental variables characteristic of the subarctic North Pacific, the Sea of Okhotsk and the Bering Sea between 30° and 70°N. The biogeographic distribution patterns as well as the preferences in sea surface temperature of 38 diatom species and species groups are documented. A Q-mode factor analysis yields a three-factor model representing assemblages associated with the Arctic, Subarctic and Subtropical water mass, indicating a close relationship between the diatom composition and the sea surface temperatures. The relative abundance pattern of 38 diatom species and species groups was statistically compared with nine environmental variables, i.e. the summer sea surface temperature and salinity, annual surface nutrient concentration (nitrate, phosphate, silicate), summer and winter mixed layer depth and summer and winter sea ice concentrations. Canonical Correspondence Analysis (CCA) and other analyses indicate 32 species and species groups have strong correspondence with the pattern of summer sea surface temperature. In addition, the total diatom flux data compiled from ten sediment traps reveal that the seasonal signals preserved in the surface sediments are mostly from spring through autumn. This close relationship between diatom composition and the summer sea surface temperature will be useful in deriving a transfer function in the subarctic North Pacific for the quantitative paleoceanographic and paleoenvironmental studies.The relative abundance of the seaice indicator diatoms Fragilariopsis cylindrus and F. oceanica of >. 20% in the diatom composition is used to represent the winter sea ice edge in the Bering Sea. The northern boundary of the distribution of F. doliolus in the open ocean is suggested to be an indicator of the Subarctic Front, while the abundance of Chaetoceros resting spores may indicate iron input from nearby continents and shelves and induced productivity events in the study area. © 2014 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/69367
Appears in Collections: 过去全球变化的重建
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作者单位: Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research, Am Handelshafen 12, D-27570 Bremerhaven, Germany
Recommended Citation:
Ren J.,Gersonde R.,Esper O.,et al. Diatom distributions in northern North Pacific surface sediments and their relationship to modern environmental variables[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2014-01-01,402