globalchange  > 气候变化事实与影响
DOI: 10.1111/bor.12377
WOS记录号: WOS:000463748900002
论文题名:
Holocene environmental history in high-Arctic North Greenland revealed by a combined biomarker and macrofossil approach
作者: Kusch, Stephanie1; Bennike, Ole2; Wagner, Bernd1; Lenz, Matthias1; Steffen, Ilona1; Rethemeyer, Janet1
通讯作者: Kusch, Stephanie
刊名: BOREAS
ISSN: 0300-9483
EISSN: 1502-3885
出版年: 2019
卷: 48, 期:2, 页码:273-286
语种: 英语
WOS关键词: DIALKYL GLYCEROL TETRAETHERS ; LAKE-SEDIMENTS ; CLIMATE-CHANGE ; WATER-COLUMN ; INTACT POLAR ; LIPIDS ; PROXY ; RECORD ; GDGTS ; CORE
WOS学科分类: Geography, Physical ; Geosciences, Multidisciplinary
WOS研究方向: Physical Geography ; Geology
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.


Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/132634
Appears in Collections:气候变化事实与影响

Files in This Item:

There are no files associated with this item.


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

Recommended Citation:
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]. BOREAS,2019-01-01,48(2):273-286
Service
Recommend this item
Sava as my favorate item
Show this item's statistics
Export Endnote File
Google Scholar
Similar articles in Google Scholar
[Kusch, Stephanie]'s Articles
[Bennike, Ole]'s Articles
[Wagner, Bernd]'s Articles
百度学术
Similar articles in Baidu Scholar
[Kusch, Stephanie]'s Articles
[Bennike, Ole]'s Articles
[Wagner, Bernd]'s Articles
CSDL cross search
Similar articles in CSDL Cross Search
[Kusch, Stephanie]‘s Articles
[Bennike, Ole]‘s Articles
[Wagner, Bernd]‘s Articles
Related Copyright Policies
Null
收藏/分享
所有评论 (0)
暂无评论
 

Items in IR are protected by copyright, with all rights reserved, unless otherwise indicated.