DOI: 10.1016/j.quascirev.2012.11.028
Scopus记录号: 2-s2.0-84885959703
论文题名: Biomarker distributions in surface sediments from the Kara and Laptev seas (Arctic Ocean): Indicators for organic-carbon sources and sea-ice coverage
作者: Xiao X. ; Fahl K. ; Stein R.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2013
卷: 79 起始页码: 40
结束页码: 52
语种: 英语
英文关键词: Arctic Ocean
; Biomarkers
; C25 HBI diene
; IP25
; Kara and Laptev seas
; PIP25
; Sea ice
Scopus关键词: Arctic ocean
; C<sub>25</sub> HBI diene
; IP<sub>25</sub>
; Laptev Sea
; PIP<sub>25</sub>
; Olefins
; Organic carbon
; Phytoplankton
; Sea ice
; Surficial sediments
; Biomarkers
; biomarker
; concentration (composition)
; environmental conditions
; marine sediment
; paleoenvironment
; primary production
; salinity
; sea ice
; sea surface temperature
; surficial sediment
; Arctic Ocean
; Kara Sea
; Laptev Sea
; Bacillariophyta
英文摘要: Studies of spatial and temporal changes in modern and past sea-ice occurrence may help to understand the processes controlling the recent decrease in Arctic sea-ice cover. Here, we determined concentrations of IP25, a novel biomarker proxy for sea ice developed in recent years, phytoplankton-derived biomarkers (brassicasterol and dinosterol) and terrigenous biomarkers (campesterol and β-sitosterol) in the surface sediments from the Kara and Laptev seas to estimate modern spatial (seasonal) sea-ice variability and organic-matter sources. C25-HBI dienes and trienes were determined as additional palaeoenvironmental proxies in the study area. Furthermore, a combined phytoplankton-IP25 biomarker approach (PIP25 index) is used to reconstruct the modern sea-ice distribution more quantitatively. The terrigenous biomarkers reach maximum concentrations in the coastal zones and estuaries, reflecting the huge discharge by the major rivers Ob, Yenisei and Lena. Maxima in phytoplankton biomarkers indicating increased primary productivity were found in the seasonally ice-free central part of the Kara and Laptev seas. Neither IP25 nor PIP25, however, shows a clear and simple correlation with satellite sea-ice distribution in our study area due to the complex environmental conditions in our study area and the transportation process of sea-ice diatom in the water column. Differences in the diene/IP25 and triene/IP25 ratios point to different sources of these HBIs and different environmental conditions. The diene/IP25 ratio seems to correlate positively with sea-surface temperature, while negatively with salinity distributions. © 2012 Elsevier Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/60488
Appears in Collections: 过去全球变化的重建
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作者单位: Alfred Wegener Institute for Polar and Marine Research, Am Alten Hafen 26, Bremerhaven 27568, Germany
Recommended Citation:
Xiao X.,Fahl K.,Stein R.. Biomarker distributions in surface sediments from the Kara and Laptev seas (Arctic Ocean): Indicators for organic-carbon sources and sea-ice coverage[J]. Quaternary Science Reviews,2013-01-01,79