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dc.contributor.authorOls, Clementine
dc.contributor.authorTrouet, Valerie
dc.contributor.authorGirardin, Martin P.
dc.contributor.authorHofgaard, Annika
dc.contributor.authorBergeron, Yves
dc.contributor.authorDrobyshev, Igor
dc.coverage.spatialNorth Atlantic Ocean, Norway, Sweden, Canada, North America, Northern Europenb_NO
dc.identifier.citationGlobal and Planetary Change. 2018, 165 1-12.nb_NO
dc.description.abstractThe mid-20th century changes in North Atlantic Ocean dynamics, e.g. slow-down of the Atlantic meridional overturning thermohaline circulation (AMOC), have been considered as early signs of tipping points in the Earth climate system. We hypothesized that these changes have significantly altered boreal forest growth dynamics in northeastern North America (NA) and northern Europe (NE), two areas geographically adjacent to the North Atlantic Ocean. To test our hypothesis, we investigated tree growth responses to seasonal large-scale oceanic and atmospheric indices (the AMOC, North Atlantic Oscillation (NAO), and Arctic Oscillation (AO)) and climate (temperature and precipitation) from 1950 onwards, both at the regional and local levels. We developed a network of 6876 black spruce (NA) and 14437 Norway spruce (NE) tree-ring width series, extracted from forest inventory databases. Analyses revealed post-1980 shifts from insignificant to significant tree growth responses to summer oceanic and atmospheric dynamics both in NA (negative responses to NAO and AO indices) and NE (positive response to NAO and AMOC indices). The strength and sign of these responses varied, however, through space with stronger responses in western and central boreal Quebec and in central and northern boreal Sweden, and across scales with stronger responses at the regional level than at the local level. Emerging post- 1980 associations with North Atlantic Ocean dynamics synchronized with stronger tree growth responses to local seasonal climate, particularly to winter temperatures. Our results suggest that ongoing and future anomalies in oceanic and atmospheric dynamics may impact forest growth and carbon sequestration to a greater extent than previously thought. Cross-scale differences in responses to North Atlantic Ocean dynamics highlight complex interplays in the effects of local climate and ocean-atmosphere dynamics on tree growth processes and advocate for the use of different spatial scales in climate-growth research to better understand factors controlling tree growth. Climate change Dendrochronology Climate-growth interactions Response functions Teleconnections Arctic amplificationnb_NO
dc.rightsAttribution-NonCommercial-NoDerivatives 4.0 Internasjonal*
dc.titlePost-1980 shifts in the sensitivity of boreal tree growth to North Atlantic Ocean dynamics and seasonal climatenb_NO
dc.typeJournal articlenb_NO
dc.typePeer reviewednb_NO
dc.subject.nsiVDP::Zoologiske og botaniske fag: 480nb_NO
dc.subject.nsiVDP::Zoology and botany: 480nb_NO
dc.source.journalGlobal and Planetary Changenb_NO
dc.relation.projectEU/EU Belmont Forum (project PREREAL)nb_NO
dc.relation.projectNorges forskningsråd: 160022nb_NO
dc.relation.projectAndre: Nordic Forest Research Cooperation Committeenb_NO
dc.relation.projectAndre: Natural Sciences and Engineering Research Council of Canadanb_NO
cristin.unitnameAvdeling for terrestrisk økologi

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Attribution-NonCommercial-NoDerivatives 4.0 Internasjonal
Except where otherwise noted, this item's license is described as Attribution-NonCommercial-NoDerivatives 4.0 Internasjonal