Heightened sensitivity of a poorly buffered high arctic lake to late-Holocene climatic change |
| |
| Authors: | Neal Michelutti Marianne SV Douglas Alexander P Wolfe John P Smol |
| |
| Institution: | aPaleoecological Environmental Assessment and Research Lab (PEARL), Department of Biology, Queen’s University, Kingston, Ontario, Canada K7L 3N6;bDepartment of Geology, University of Toronto, Toronto, Ontario, Canada M5S 3B1;cDepartment of Earth and Atmospheric Sciences, University of Alberta, Edmonton, Alberta, Canada T6G 2E3 |
| |
| Abstract: | A diatom-based paleolimnological investigation was conducted on late Holocene sediments from a poorly buffered lake, informally named “Rock Basin Lake”, on Ellesmere Island, Arctic Canada. The fossil diatom record is unlike any other obtained thus far from high arctic regions, exhibiting dynamic assemblage shifts over the entire  3300 yr sedimentary record. Multiple proxies (i.e., diatoms, pH reconstructions, biogenic silica, C/N ratios, total organic carbon) appear to sensitively track rapid limnological changes, which are associated with distinct climate intervals as inferred from other regional proxy records. The highly responsive nature of the diatom assemblages in Rock Basin Lake, relative to those recorded from nearby alkaline sites, appears to be related to this lake's limited ability to buffer changes in pH. The dynamic species responses suggest that the diatoms in Rock Basin Lake are faithfully tracking climatic changes, and that low-alkalinity lakes may provide the most sensitive diatom-based paleolimnological records from high arctic regions. |
| |
| Keywords: | Paleolimnology Arctic Canada Soft-water lakes Diatoms pH Climate change |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
