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

Ols, Clémentine; Girardin, Martin P.; Hofgaard, Annika; Bergeron, Yves; Drobyshev, Igor

doi:10.1016/j.gloplacha.2018.03.006

Cited by 18 publications

(18 citation statements)

References 53 publications

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“…Excess heat during late summer and autumn may lead to declines in carbohydrate reserve accumulation at the end of the growing season, thereby negatively affecting spring growth, as was previously observed in both boreal North America and Northern Europe Ols et al, 2018). Excess heat during late summer and autumn may lead to declines in carbohydrate reserve accumulation at the end of the growing season, thereby negatively affecting spring growth, as was previously observed in both boreal North America and Northern Europe Ols et al, 2018).…”

Section: Discussionsupporting

confidence: 55%

Taxonomy, together with ontogeny and growing conditions, drives needleleaf species' sensitivity to climate in boreal North America

Marchand

Girardin

Hartmann

et al. 2019

Global Change Biology

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Currently, there is no consensus regarding the way that changes in climate will affect boreal forest growth, where warming is occurring faster than in other biomes. Some studies suggest negative effects due to drought‐induced stresses, while others provide evidence of increased growth rates due to a longer growing season. Studies focusing on the effects of environmental conditions on growth–climate relationships are usually limited to small sampling areas that do not encompass the full range of environmental conditions; therefore, they only provide a limited understanding of the processes at play. Here, we studied how environmental conditions and ontogeny modulated growth trends and growth–climate relationships of black spruce (Picea mariana) and jack pine (Pinus banksiana) using an extensive dataset from a forest inventory network. We quantified the long‐term growth trends at the stand scale, based on analysis of the absolutely dated ring‐width measurements of 2,266 trees. We assessed the relationship between annual growth rates and seasonal climate variables and evaluated the effects of various explanatory variables on long‐term growth trends and growth–climate relationships. Both growth trends and growth–climate relationships were species‐specific and spatially heterogeneous. While the growth of jack pine barely increased during the study period, we observed a growth decline for black spruce which was more pronounced for older stands. This decline was likely due to a negative balance between direct growth gains induced by improved photosynthesis during hotter‐than‐average growing conditions in early summers and the loss of growth occurring the following year due to the indirect effects of late‐summer heat waves on accumulation of carbon reserves. For stands at the high end of our elevational gradient, frost damage during milder‐than‐average springs could act as an additional growth stressor. Competition and soil conditions also modified climate sensitivity, which suggests that effects of climate change will be highly heterogeneous across the boreal biome.

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Section: Discussionsupporting

confidence: 55%

Taxonomy, together with ontogeny and growing conditions, drives needleleaf species' sensitivity to climate in boreal North America

Marchand

Girardin

Hartmann

et al. 2019

Global Change Biology

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“…The combination of spatial comprehensiveness and regular or continuous implementation thus provides an invaluable support for a spatiotemporal monitoring of forest systems for a large panel of features (e.g. growth and health; Aguirre, del Río, & Condés, 2019;Charru, Seynave, Hervé, Bertrand, & Bontemps, 2017;Girardin et al, 2016;Ols et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

Recent growth trends of conifers across Western Europe are controlled by thermal and water constraints and favored by forest heterogeneity

Ols

Hervé

Bontemps

2020

Science of The Total Environment

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HAL is a multi-disciplinary open access archive for the deposit and dissemination of scientific research documents, whether they are published or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers. L'archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de documents scientifiques de niveau recherche, publiés ou non, émanant des établissements d'enseignement et de recherche français ou étrangers, des laboratoires publics ou privés.

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“…In the palaeoclimatic study of Drobyshev et al (2016), it has been suggested that the Atlantic sea surface temperatures are associated with cold conditions which direct precipitation southwards and thus are linked with dry conditions over Sweden. The influence of Atlantic Ocean, Atlantic meridional overturning thermohaline circulation (AMOC) was confirmed for the last 50 years by Ols et al (2018), correlated with NAO and AO. According to their study, the sign and strength of the atmospheric index correlation depends on the season, with the most significant correlation appearing for positive summer AMOC, NAO and AO, which favours more precipitation.…”

Section: Resultsmentioning

confidence: 91%

“…Future research should also focus on the study of the temporal component of the cluster and network structures. For example, Ols et al (2018) have found that the influence of oceanic circulation to Scandinavian hydroclimatic conditions is shifting over a decadal scale. Thus, it would be beneficial to see how the regions and their cross-correlation change in time.…”

Section: Resultsmentioning

confidence: 99%

Representation of European hydroclimatic patterns with self-organizing maps

Markonis

Strnad

2020

The Holocene

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Self-organizing maps provide a powerful, non-linear technique of dimensionality reduction that can be used to identify clusters with similar attributes. Here, they were constructed from a 1000-year-long gridded palaeoclimatic dataset, namely the Old World Drought Atlas, to detect regions of homogeneous hydroclimatic variability across the European continent. A classification scheme of 10 regions was found to describe most efficiently the spatial properties of Europe’s hydroclimate. These regions were mainly divided into a northern and a southern subset, linked together with a northwest-to-southeast orientation. Further analysis of the classification scheme with complex networks confirmed the divergence between the northern and southern components of European hydroclimate, also revealing that is not strongly correlated to the Iberian Peninsula. On the contrary, the region covering the British Isles, France and Germany appeared to be linked to both branches, implying links of hydroclimate with atmospheric/oceanic circulation.

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

Cited by 18 publications

References 53 publications

Taxonomy, together with ontogeny and growing conditions, drives needleleaf species' sensitivity to climate in boreal North America

Taxonomy, together with ontogeny and growing conditions, drives needleleaf species' sensitivity to climate in boreal North America

Recent growth trends of conifers across Western Europe are controlled by thermal and water constraints and favored by forest heterogeneity

Representation of European hydroclimatic patterns with self-organizing maps

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