Pollen-based summer temperature reconstructions for the eastern Canadian boreal forest, subarctic, and Arctic

Michael W. Kerwin, Jonathan Overpeck, Robert S. Webb, Katherine H. Anderson

Research output: Contribution to journalArticle

62 Citations (Scopus)

Abstract

Pollen-based paleoclimate reconstructions using response surface and modern analog methods reveal an 8000-year record of July temperature fluctuations for 25 eastern Canadian lake sites located from the forest-tundra to the high Canadian Arctic. Postglacial conditions, characterized by warmer than present summer temperatures, prevailed in Baffin Island and NE Labrador beginning about 7500 and 7000 14CyrBP, respectively, resulting in warmer than present conditions throughout the region by 6000 14CyrBP (+0.5°C to 1°C). Further south, in Quebec and W Labrador, July temperatures were 1-2°C colder than present until after 6000 14CyrBP, and only reached modern values after all residual Laurentide ice had melted. Increased summertime insolation and the final disappearance of Laurentide Ice during the middle Holocene probably caused July temperatures throughout eastern Canada to peak between approximately 5000 and 3500 14CyrBP. Mid-Holocene warming relative to today was more pronounced in Baffin Island and NE Labrador (+1°C to 2°C) compared to the boreal and subarctic regions of Quebec and W Labrador (<+1°C). Over the past 4000 years, decreasing summertime insolation and colder sea surface temperatures in the Davis Strait and Labrador Sea contributed to a decline in July temperatures of 1-2°C throughout Baffin Island, and the tundra regions of N Quebec and Labrador. The absence of similar cooling in the records from the boreal forest may support the notion that the mean position of the summertime polar front blocked the colder Arctic air during the late Holocene.

Original languageEnglish (US)
Pages (from-to)1901-1924
Number of pages24
JournalQuaternary Science Reviews
Volume23
Issue number18-19
DOIs
StatePublished - Oct 2004

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Newfoundland and Labrador
Arctic
boreal forests
boreal forest
Arctic region
reconstruction
pollen
summer
present
Quebec
Holocene
temperature
insolation
tundra
fluctuation
solar radiation
subarctic region
ice
air
polar front

ASJC Scopus subject areas

  • Earth-Surface Processes

Cite this

Pollen-based summer temperature reconstructions for the eastern Canadian boreal forest, subarctic, and Arctic. / Kerwin, Michael W.; Overpeck, Jonathan; Webb, Robert S.; Anderson, Katherine H.

In: Quaternary Science Reviews, Vol. 23, No. 18-19, 10.2004, p. 1901-1924.

Research output: Contribution to journalArticle

Kerwin, Michael W. ; Overpeck, Jonathan ; Webb, Robert S. ; Anderson, Katherine H. / Pollen-based summer temperature reconstructions for the eastern Canadian boreal forest, subarctic, and Arctic. In: Quaternary Science Reviews. 2004 ; Vol. 23, No. 18-19. pp. 1901-1924.
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