Tree growth and inferred temperature variability at the North American Arctic treeline

Rosanne D'Arrigo, Gordon Jacoby, Brendan Buckley, John Sakulich, David Frank, Rob Wilson, Ashley Curtis, Kevin Anchukaitis

Research output: Contribution to journalArticlepeer-review

48 Scopus citations

Abstract

We present white spruce (Picea glauca) tree-ring width and maximum latewood density chronologies for two latitudinal treeline sites in northern interior Canada: along the Coppermine River in the Northwest Territories (NWT); and in the Thelon River Sanctuary, Nunavut. These chronologies provide climate and tree growth information for these two remote locations, filling a sizeable gap in spatial coverage of proxy records used to reconstruct temperature variability for the Northern Hemisphere. They represent some of the longest high-resolution proxies available for northern North America, dating as far back as AD 1046 for Coppermine ring widths. These chronologies correlate significantly with hemispheric-scale annual temperature reconstructions for the past millennium. Density records from both sites show a positive relationship with warm-season temperature data since ∼ the mid-20th century, although this link is somewhat weaker in recent decades (since ∼ 1980). Both ring-width chronologies demonstrate even greater loss of temperature sensitivity, and in the Thelon ring-width series a sustained reduction in growth appears linked to increased drought stress in this recent period. Diminishing correlations with temperature are also found when the Thelon ring-width and climate data are prewhitened, indicating that any low frequency uncertainties in the instrumental or tree-ring data (e.g., artifacts from the standardization process) cannot entirely account for this result. Our findings therefore suggest a recent loss of temperature sensitivity at these northern treeline locations that varies with the parameter and site studied. These and other uncertainties in the tree-ring as well as instrumental data will need to be resolved in future efforts to relate northern tree-ring records to temperature variability on a range of spatial scales.

Original languageEnglish (US)
Pages (from-to)71-82
Number of pages12
JournalGlobal and Planetary Change
Volume65
Issue number1-2
DOIs
StatePublished - Jan 2009
Externally publishedYes

Keywords

  • Arctic
  • dendroclimatology
  • divergence
  • reconstruction
  • temperature
  • tree rings
  • treeline

ASJC Scopus subject areas

  • Global and Planetary Change
  • Oceanography

Fingerprint

Dive into the research topics of 'Tree growth and inferred temperature variability at the North American Arctic treeline'. Together they form a unique fingerprint.

Cite this