Recent changes in a remote Arctic lake are unique within the past 200,000 years

被引:62
作者
Axford, Yarrow [1 ]
Briner, Jason P. [3 ]
Cooke, Colin A. [4 ]
Francis, Donna R. [5 ]
Michelutti, Neal [6 ]
Miller, Gifford H. [1 ,2 ]
Smol, John P. [6 ]
Thomas, Elizabeth K. [3 ]
Wilson, Cheryl R. [6 ]
Wolfe, Alexander P. [4 ]
机构
[1] Univ Colorado, Inst Arctic & Alpine Res, Boulder, CO 80309 USA
[2] Univ Colorado, Dept Geol Sci, Boulder, CO 80309 USA
[3] SUNY Buffalo, Dept Geol, Buffalo, NY 14260 USA
[4] Univ Alberta, Dept Earth & Atmospher Sci, Edmonton, AB T6G 2E3, Canada
[5] Univ Massachusetts, Dept Geosci, Amherst, MA 01003 USA
[6] Queens Univ, Dept Biol, Paleoecol Environm Assessment & Res Lab, Kingston, ON K7L 3N6, Canada
基金
加拿大自然科学与工程研究理事会; 美国国家科学基金会;
关键词
chironomids; climate change; diatoms; paleolimnology; polar; NORTHEASTERN BAFFIN-ISLAND; HOLOCENE CLIMATE-CHANGE; ENVIRONMENTAL-CHANGE; RECONSTRUCTION; NUNAVUT; CANADA; MIDGES;
D O I
10.1073/pnas.0907094106
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
The Arctic is currently undergoing dramatic environmental transformations, but it remains largely unknown how these changes compare with long-term natural variability. Here we present a lake sediment sequence from the Canadian Arctic that records warm periods of the past 200,000 years, including the 20th century. This record provides a perspective on recent changes in the Arctic and predates by approximately 80,000 years the oldest stratigraphically intact ice core recovered from the Greenland Ice Sheet. The early Holocene and the warmest part of the Last Interglacial (Marine Isotope Stage or MIS 5e) were the only periods of the past 200,000 years with summer temperatures comparable to or exceeding today's at this site. Paleoecological and geochemical data indicate that the past three interglacial periods were characterized by similar trajectories in temperature, lake biology, and lakewater pH, all of which tracked orbitally-driven solar insolation. In recent decades, however, the study site has deviated from this recurring natural pattern and has entered an environmental regime that is unique within the past 200 millennia.
引用
收藏
页码:18443 / 18446
页数:4
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