Post-glacial climate change and its effect on a shallow dimictic lake in Nova Scotia, Canada

Brent Lennox, Ian Spooner, Timothy Jull, William P. Patterson

Research output: Contribution to journalArticle

9 Scopus citations

Abstract

A high-resolution, multi-proxy lake sediment record was used to establish the timing of Holocene environmental change in Canoran Lake, southwest Nova Scotia, Canada. Proxies include %C, δ15N, δ13C, HI, magnetic susceptibility, and pollen. Canoran Lake is a small, shallow (11 m) lake with two ephemeral inlets and an outlet. The site was deglaciated at ca. 15,300 cal (calibrated) year BP and elevated %C values indicate the establishment of a productive aquatic environment that is consistent with Allerød warming. The Allerød was interrupted by rapid air temperature cooling during the Younger Dryas (ca. 12,900-11,600 cal year BP). The Early Hypsithermal (ca. 11,600-8,500 cal year BP) was relatively warm and wet. A slight increase in clastic input occurred between 9,100 and 8,500 cal year BP but δ15N, δ13C, and HI values imply that the lithostratigraphic response may not be indicative of climate-induced change. The strong proxy response between 8,500 and 8,000 cal year BP was likely due to cooling and drying coincident with the 8.2 k year event. The climate was relatively warm and dry during the Late Hypsithermal (ca. 8,000-3,500 cal year BP). None of the proxies' exhibit notable change during the 5,500 cal year BP hemlock decline, indicating that ecological change was likely due to a pathogen attack. Post-Hypsithermal (modern) climate was characterized by an increase in precipitation and a decrease in air temperatures from ca. 3,500 to 700 cal year BP (top of core).

Original languageEnglish (US)
Pages (from-to)15-27
Number of pages13
JournalJournal of Paleolimnology
Volume43
Issue number1
DOIs
StatePublished - 2010

Keywords

  • Climate change
  • Hydrogen index
  • Limnology
  • Multi-proxy
  • Nova Scotia
  • Paleolimnology
  • Stable isotopes

ASJC Scopus subject areas

  • Aquatic Science
  • Earth-Surface Processes

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