气候变化领域集成服务门户(CCPortal): Environmental responses to the 9.7 and 8.2 cold events at two ecotonal sites in the Dovre mountains; mid-Norway

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DOI	10.1016/j.quascirev.2018.12.009
	Environmental responses to the 9.7 and 8.2 cold events at two ecotonal sites in the Dovre mountains; mid-Norway
	Paus A.; Haflidason H.; Routh J.; Naafs B.D.A.; Thoen M.W.
发表日期	2019
ISSN	0277-3791
起始页码	45
结束页码	61
卷号	205
英文摘要	We found strong signals of two cooling events around 9700 and 8200 cal yrs. BP in lakes Store Finnsjøen and Flåfattjønna at Dovre, mid-Norway. Analyses included pollen in both lakes, and C/N-ratio, biomarkers (e.g. alkanes and br-GDGTs), and XRF scanning in Finnsjøen. The positions of these lakes close to ecotones (upper forest-lines of birch and pine, respectively) reduced their resilience to cold events causing vegetation regression at both sites. The global 8.2 event reflects the collapse of the Laurentide Ice Sheet. The 9.7 event with impact restricted to Scandinavia and traced by pollen at Dovre only, reflects the drainage of the Baltic Ancylus Lake. More detailed analysis in Finnsjøen shows that the events also caused increased allochtonous input (K, Ca), increased sedimentation rate, and decreased sediment density and aquatic production. br-GDGT-based temperatures indicate gradual cooling through the early Holocene. In Finnsjøen, ca. 3100 maxima-minima couplets in sediment density along the analysed sequence of ca. 3100 calibrated years show the presence of varves for the first time in Norway. Impact of the 9.7 and 8.2 events lasted ca. 60 and 370 years, respectively. Pine pollen percentages were halved and re-established in less than 60 years, indicating the reduction of pine pollen production and not vegetative growth during the 9.7 event. The local impact of the 8.2 event sensu lato (ca. 8420–8050 cal yrs. BP) divides the event into a precursor, an erosional phase, and a recovery phase. At the onset of the erosional phase, summer temperatures increased. © 2018 Elsevier Ltd
英文关键词	9.7 and 8.2 cold events; Biomarkers; Early Holocene; Ecotones; Lake sedimentology; Paleoclimatology; Scandinavia; Varves; Vegetation dynamics
语种	英语
scopus关键词	Biomarkers; Ecology; Erosion; Vegetation; 9.7 and 8.2 cold events; Early Holocene; Ecotones; Paleoclimatology; Scandinavia; Varves; Vegetation dynamics; Lakes; biological production; biomarker; coniferous tree; cooling; ecotone; Holocene; lacustrine deposit; Laurentide Ice Sheet; paleobotany; paleolimnology; palynology; sedimentation rate; vegetation dynamics; Norway; Scandinavia
来源期刊	Quaternary Science Reviews
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/152042
作者单位	Department of Biological Science, University of Bergen, Post Box 7803, Bergen, N-5020, Norway; Department of Earth Science, University of Bergen, Allégaten 41, Bergen, N-5007, Norway; Bjerknes Centre for Climate Research, University of Bergen, Jahnebakken 5, Bergen, NO-5007, Norway; Department of Thematic Studies – Environmental Change, Linköping University, Linköping, 58183, Sweden; Organic Geochemistry Unit, School of Chemistry and Cabot Institute, University of Bristol, Bristol, United Kingdom
推荐引用方式 GB/T 7714	Paus A.,Haflidason H.,Routh J.,et al. Environmental responses to the 9.7 and 8.2 cold events at two ecotonal sites in the Dovre mountains; mid-Norway[J],2019,205.
APA	Paus A.,Haflidason H.,Routh J.,Naafs B.D.A.,&Thoen M.W..(2019).Environmental responses to the 9.7 and 8.2 cold events at two ecotonal sites in the Dovre mountains; mid-Norway.Quaternary Science Reviews,205.
MLA	Paus A.,et al."Environmental responses to the 9.7 and 8.2 cold events at two ecotonal sites in the Dovre mountains; mid-Norway".Quaternary Science Reviews 205(2019).