Post-1980 shifts in the sensitivity of boreal tree growth to North Atlantic Ocean dynamics and seasonal climate
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 borea...
Published in: | Global and Planetary Change |
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Main Authors: | , , , , , |
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Format: | Article in Journal/Newspaper |
Language: | English |
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ELSEVIER SCIENCE BV
2018
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Online Access: | http://hdl.handle.net/10150/628343 https://doi.org/10.1016/j.gloplacha.2018.03.006 |
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ftunivarizona:oai:repository.arizona.edu:10150/628343 |
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record_format |
openpolar |
institution |
Open Polar |
collection |
The University of Arizona: UA Campus Repository |
op_collection_id |
ftunivarizona |
language |
English |
topic |
Climate change Dendrochronology Climate-growth interactions Response functions Teleconnections Arctic amplification |
spellingShingle |
Climate change Dendrochronology Climate-growth interactions Response functions Teleconnections Arctic amplification Ols, Clémentine Trouet, Valerie Girardin, Martin P. Hofgaard, Annika Bergeron, Yves Drobyshev, Igor Post-1980 shifts in the sensitivity of boreal tree growth to North Atlantic Ocean dynamics and seasonal climate |
topic_facet |
Climate change Dendrochronology Climate-growth interactions Response functions Teleconnections Arctic amplification |
description |
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. 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 24 month embargo; published online: 18 March 2018 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. |
author2 |
Univ Arizona, Lab Tree Ring Res |
format |
Article in Journal/Newspaper |
author |
Ols, Clémentine Trouet, Valerie Girardin, Martin P. Hofgaard, Annika Bergeron, Yves Drobyshev, Igor |
author_facet |
Ols, Clémentine Trouet, Valerie Girardin, Martin P. Hofgaard, Annika Bergeron, Yves Drobyshev, Igor |
author_sort |
Ols, Clémentine |
title |
Post-1980 shifts in the sensitivity of boreal tree growth to North Atlantic Ocean dynamics and seasonal climate |
title_short |
Post-1980 shifts in the sensitivity of boreal tree growth to North Atlantic Ocean dynamics and seasonal climate |
title_full |
Post-1980 shifts in the sensitivity of boreal tree growth to North Atlantic Ocean dynamics and seasonal climate |
title_fullStr |
Post-1980 shifts in the sensitivity of boreal tree growth to North Atlantic Ocean dynamics and seasonal climate |
title_full_unstemmed |
Post-1980 shifts in the sensitivity of boreal tree growth to North Atlantic Ocean dynamics and seasonal climate |
title_sort |
post-1980 shifts in the sensitivity of boreal tree growth to north atlantic ocean dynamics and seasonal climate |
publisher |
ELSEVIER SCIENCE BV |
publishDate |
2018 |
url |
http://hdl.handle.net/10150/628343 https://doi.org/10.1016/j.gloplacha.2018.03.006 |
geographic |
Arctic Canada Norway |
geographic_facet |
Arctic Canada Norway |
genre |
Arctic Climate change North Atlantic North Atlantic oscillation |
genre_facet |
Arctic Climate change North Atlantic North Atlantic oscillation |
op_source |
Global and Planetary Change 165 1 12 |
op_relation |
http://linkinghub.elsevier.com/retrieve/pii/S0921818117302564 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 09218181 doi:10.1016/j.gloplacha.2018.03.006 http://hdl.handle.net/10150/628343 GLOBAL AND PLANETARY CHANGE |
op_rights |
© 2018 Elsevier B.V. All rights reserved. |
op_doi |
https://doi.org/10.1016/j.gloplacha.2018.03.006 |
container_title |
Global and Planetary Change |
container_volume |
165 |
container_start_page |
1 |
op_container_end_page |
12 |
_version_ |
1766337560087363584 |
spelling |
ftunivarizona:oai:repository.arizona.edu:10150/628343 2023-05-15T15:05:53+02:00 Post-1980 shifts in the sensitivity of boreal tree growth to North Atlantic Ocean dynamics and seasonal climate Ols, Clémentine Trouet, Valerie Girardin, Martin P. Hofgaard, Annika Bergeron, Yves Drobyshev, Igor Univ Arizona, Lab Tree Ring Res 2018-06 http://hdl.handle.net/10150/628343 https://doi.org/10.1016/j.gloplacha.2018.03.006 en eng ELSEVIER SCIENCE BV http://linkinghub.elsevier.com/retrieve/pii/S0921818117302564 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 09218181 doi:10.1016/j.gloplacha.2018.03.006 http://hdl.handle.net/10150/628343 GLOBAL AND PLANETARY CHANGE © 2018 Elsevier B.V. All rights reserved. Global and Planetary Change 165 1 12 Climate change Dendrochronology Climate-growth interactions Response functions Teleconnections Arctic amplification Article 2018 ftunivarizona https://doi.org/10.1016/j.gloplacha.2018.03.006 2020-06-14T08:16:30Z 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. 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 24 month embargo; published online: 18 March 2018 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. Article in Journal/Newspaper Arctic Climate change North Atlantic North Atlantic oscillation The University of Arizona: UA Campus Repository Arctic Canada Norway Global and Planetary Change 165 1 12 |