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DOI10.1111/bor.12377
Holocene environmental history in high-Arctic North Greenland revealed by a combined biomarker and macrofossil approach
Kusch, Stephanie1; Bennike, Ole2; Wagner, Bernd1; Lenz, Matthias1; Steffen, Ilona1; Rethemeyer, Janet1
发表日期2019
ISSN0300-9483
EISSN1502-3885
卷号48期号:2页码:273-286
英文摘要

In this study, we use a combined biomarker and macrofossil approach to reconstruct the Holocene climate history recorded in Trifna SO, Skallingen area, eastern North Greenland. Chronological information is derived from comparison of lithological, biogeochemical and macrofossil characteristics with a well-dated record from nearby Lille Sneha SO. Following local deglaciation around c.8cal.kaBP, the local peak warmth occurred between c.7.4 and 6.2cal.kaBP as indicated by maximum macrofossil abundances of warmth-demanding plants (Salix arctica andDryas integrifolia) and invertebrates (Daphnia pulex and Chironomidae). Warm conditions were dominated by terrestrial organic matter (OM) sedimentation as implied by the alkane-based P-aq ratio, but increased aquatic productivity is indicated when temperature was highest around 6.5cal.kaBP. The n-C-29/n-C-31 alkane ratio shows that vegetation in the catchment was dominated by shrubs after deglaciation, but shifted towards relatively more grassy/herbaceous vegetation during peak warmth. After 5.4cal.kaBP, the disappearance of warmth-demanding plant and invertebrate macrofossils indicates cooling in the Skallingen area. This cooling was characterized by a significant shift towards dominance of aquatic OM sedimentation in Trifna SO as implied by high P-aq ratios. Cooling was also associated with a shift in vegetation type from dwarf-shrub heaths towards relatively more herbaceous vegetation in the catchment, stronger erosion and more oligotrophic conditions in the lake. Our data show that mean air temperatures inferred using branched glycerol dialkyl glycerol tetraethers (brGDGTs) do not seem to accurately reflect the local climatic history. Irrespective of calibration, methylation of branched tetraethers (MBT) palaeothermometry cannot be reconciled with the macrofossil evidence and seems to be biased by either changing brGDGT sources (insitu vs. soil-derived) or changing species assemblages and/or an unknown physiological responseto changing environmental conditions at high latitude.


WOS研究方向Physical Geography ; Geology
来源期刊BOREAS
文献类型期刊论文
条目标识符http://gcip.llas.ac.cn/handle/2XKMVOVA/95323
作者单位1.Univ Cologne, Inst Geol & Mineral, Zulpicher Str 49b, D-50674 Cologne, Germany;
2.Geol Survey Denmark & Greenland, Oster Voldgade 10, DK-1350 Copenhagen K, Denmark
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GB/T 7714
Kusch, Stephanie,Bennike, Ole,Wagner, Bernd,et al. Holocene environmental history in high-Arctic North Greenland revealed by a combined biomarker and macrofossil approach[J],2019,48(2):273-286.
APA Kusch, Stephanie,Bennike, Ole,Wagner, Bernd,Lenz, Matthias,Steffen, Ilona,&Rethemeyer, Janet.(2019).Holocene environmental history in high-Arctic North Greenland revealed by a combined biomarker and macrofossil approach.BOREAS,48(2),273-286.
MLA Kusch, Stephanie,et al."Holocene environmental history in high-Arctic North Greenland revealed by a combined biomarker and macrofossil approach".BOREAS 48.2(2019):273-286.
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