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    Post-1980 shifts in the sensitivity of boreal tree growth to North Atlantic Ocean dynamics and seasonal climate

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    Ols_et_al._GLOPLACHA.pdf
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    Author
    Ols, Clémentine
    Trouet, Valerie cc
    Girardin, Martin P.
    Hofgaard, Annika
    Bergeron, Yves
    Drobyshev, Igor
    Affiliation
    Univ Arizona, Lab Tree Ring Res
    Issue Date
    2018-06
    Keywords
    Climate change
    Dendrochronology
    Climate-growth interactions
    Response functions
    Teleconnections
    Arctic amplification
    
    Metadata
    Show full item record
    Publisher
    ELSEVIER SCIENCE BV
    Citation
    Ols, C., Trouet, V., Girardin, M. P., Hofgaard, A., Bergeron, Y., & Drobyshev, I. (2018). Post-1980 shifts in the sensitivity of boreal tree growth to North Atlantic Ocean dynamics and seasonal climate: Tree growth responses to North Atlantic Ocean dynamics. Global and Planetary Change, 165, 1-12. https://doi.org/10.1016/j.gloplacha.2018.03.006
    Journal
    GLOBAL AND PLANETARY CHANGE
    Rights
    © 2018 Elsevier B.V. All rights reserved.
    Collection Information
    This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.
    Abstract
    The 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.
    Note
    24 month embargo; published online: 18 March 2018
    ISSN
    09218181
    DOI
    10.1016/j.gloplacha.2018.03.006
    Version
    Final accepted manuscript
    Sponsors
    Natural Sciences and Engineering Research Council of Canada (NSERC) [STPGP 413444-11]; Nordic Forest Research Cooperation Committee (SNS); EU Belmont Forum (project PREREAL); NINA's strategic institute program portfolio - Research Council of Norway [160022/f40]; Forest Complexity Modelling (FCM), an NSERC; US National Science Foundation CAREER [AGS-1349942]; Swedish Institute
    Additional Links
    http://linkinghub.elsevier.com/retrieve/pii/S0921818117302564
    ae974a485f413a2113503eed53cd6c53
    10.1016/j.gloplacha.2018.03.006
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