气候变化领域集成服务门户(CCPortal): Early human impact in a 15;000-year high-resolution hyperspectral imaging record of paleoproduction and anoxia from a varved lake in Switzerland

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DOI	10.1016/j.quascirev.2020.106335
	Early human impact in a 15;000-year high-resolution hyperspectral imaging record of paleoproduction and anoxia from a varved lake in Switzerland
	Makri S.; Rey F.; Gobet E.; Gilli A.; Tinner W.; Grosjean M.
发表日期	2020
ISSN	0277-3791
卷号	239
英文摘要	20th century eutrophication and global spread of anoxia is a threat for freshwater ecosystems. Little is known about Holocene anoxia and meromixis events when anthropogenic impacts were weaker and natural ecosystem variability played the dominant role. In this study, we examine the relationship between lake mixing and lake production, climate variability, vegetation cover, catchment erosion and (pre)historic anthropogenic impacts in Moossee (Switzerland), over the last 15,000 years. We use sub-annually resolved calibrated hyperspectral imaging data (total chlorophyll for paleoproduction, bacteriopheophytin for anoxia and meromixis) combined with X-ray fluorescence and pollen data. Production shows a first increase at 14,500 cal yr BP, a further increase after 7500 cal BP, relative maxima in the late Bronze, Iron and Middle Ages, and the unprecedented peak in the 20th Century. Until 7500 cal BP, the lake was well mixed with only scarce phases of seasonal to multiannual anoxia. Repeated meromixis events occurred between 7500 and 2500 cal BP when temperatures were high, forests closed, and lake production was already enhanced. After the forests were cleared (2500 cal BP) the lake remained mostly holomictic. Holocene meromixis events were systematically terminated by local deforestation related to Neolithic and Bronze Age lakeshore settlements: charcoal peaked, tree pollen dropped below a threshold of 80%, soil erosion and lake production increased and bacteriopheophytin disappeared. Meromixis re-established after the termination of lakeshore settlements and the onset of afforestation with tree pollen exceeding 80%. These repeated cycles unambiguously document how even early human societies affected the mixing regime and biogeochemical cycling in this lake. © 2020 Elsevier Ltd
英文关键词	Bacteriopheophytin; Holocene; Lake mixing regime; Lake production; Land use; Late Glacial; Paleolimnology; Western Europe
语种	英语
scopus关键词	Bronze; Catchments; Charcoal; Deforestation; Ecosystems; Erosion; Eutrophication; Lakes; Mixing; Reforestation; Spectroscopy; Anthropogenic impacts; Biogeochemical cycling; Climate variability; Freshwater ecosystem; Hyperspectral imaging datum; Natural ecosystem; Total chlorophyll; X ray fluorescence; Hyperspectral imaging; biogeochemical cycle; Bronze Age; catchment; deforestation; Holocene; multispectral image; soil erosion; X-ray fluorescence; Switzerland
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/151454
作者单位	Institute of Geography & Oeschger Centre for Climate Change Research, University of Bern, Erlachstrasse 9a, Bern, 3012, Switzerland; Institute of Plant Sciences & Oeschger Centre for Climate Change Research, University of Bern, Altenbergrain 21, Bern, 3013, Switzerland; Geological Institute, ETH Zurich, Sonneggstrasse 5, Zurich, 8092, Switzerland
推荐引用方式 GB/T 7714	Makri S.,Rey F.,Gobet E.,et al. Early human impact in a 15;000-year high-resolution hyperspectral imaging record of paleoproduction and anoxia from a varved lake in Switzerland[J],2020,239.
APA	Makri S.,Rey F.,Gobet E.,Gilli A.,Tinner W.,&Grosjean M..(2020).Early human impact in a 15;000-year high-resolution hyperspectral imaging record of paleoproduction and anoxia from a varved lake in Switzerland.Quaternary Science Reviews,239.
MLA	Makri S.,et al."Early human impact in a 15;000-year high-resolution hyperspectral imaging record of paleoproduction and anoxia from a varved lake in Switzerland".Quaternary Science Reviews 239(2020).