An overview of tree-ring width records across the Northern Hemisphere

George, Scott St.

doi:10.1016/j.quascirev.2014.04.029

Cited by 186 publications

(107 citation statements)

References 194 publications

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“…On top of this, additional observational studies suggest that complex feedbacks between drought-induced defoliation, tree primary and secondary growth, and carbon starvation might extend and lengthen tree recovery periods, limiting tree long-term resilience and resulting in declining trends (e.g. Independently from these ecophysiological processes, intrinsically delayed responses of soil hydrological systems, affecting groundwater levels several months after the meteorological drought can also additionally contribute to the emergence of long-term tree responses (St George, 2014). Independently from these ecophysiological processes, intrinsically delayed responses of soil hydrological systems, affecting groundwater levels several months after the meteorological drought can also additionally contribute to the emergence of long-term tree responses (St George, 2014).…”

Section: Discussionmentioning

confidence: 99%

Regime shifts of Mediterranean forest carbon uptake and reduced resilience driven by multidecadal ocean surface temperatures

Carnicer

Domingo‐Marimon

Ninyerola

et al. 2019

Global Change Biology

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The mechanisms translating global circulation changes into rapid abrupt shifts in forest carbon capture in semi‐arid biomes remain poorly understood. Here, we report unprecedented multidecadal shifts in forest carbon uptake in semi‐arid Mediterranean pine forests in Spain over 1950–2012. The averaged carbon sink reduction varies between 31% and 37%, and reaches values in the range of 50% in the most affected forest stands. Regime shifts in forest carbon uptake are associated with climatic early warning signals, decreased forest regional synchrony and reduced long‐term carbon sink resilience. We identify the mechanisms linked to ocean multidecadal variability that shape regime shifts in carbon capture. First, we show that low‐frequency variations of the surface temperature of the Atlantic Ocean induce shifts in the non‐stationary effects of El Niño Southern Oscillation (ENSO) on regional forest carbon capture. Modelling evidence supports that the non‐stationary effects of ENSO can be propagated from tropical areas to semi‐arid Mediterranean biomes through atmospheric wave trains. Second, decadal changes in the Atlantic Multidecadal Oscillation (AMO) significantly alter sea–air heat exchanges, modifying in turn ocean vapour transport over land and land surface temperatures, and promoting sustained drought conditions in spring and summer that reduce forest carbon uptake. Third, we show that lagged effects of AMO on the winter North Atlantic Oscillation also contribute to the maintenance of long‐term droughts. Finally, we show that the reported strong, negative effects of ocean surface temperature (AMO) on forest carbon uptake in the last decades are unprecedented over the last 150 years. Our results provide new, unreported explanations for carbon uptake shifts in these drought‐prone forests and review the expected impacts of global warming on the profiled mechanisms.

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Section: Discussionmentioning

confidence: 99%

Regime shifts of Mediterranean forest carbon uptake and reduced resilience driven by multidecadal ocean surface temperatures

Carnicer

Domingo‐Marimon

Ninyerola

et al. 2019

Global Change Biology

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“…Recently, a new drought reconstruction has been developed inferring from three sampling sites on the marginal area of the Hulun Buir Sandy Land (Bao et al, 2015). Cook et al (1998) and George (2014) suggest where many records within a tree-ring network from the same region or species do not strongly respond to a specific climate mode, it does not mean that forcing has no effect on these records.…”

Section: Accepted Manuscriptmentioning

confidence: 99%

A tree-ring based reconstruction of summer relative humidity variability in eastern Mongolian Plateau and its associations with the Pacific and Indian Oceans

Liu

Bao

et al. 2015

Palaeogeography, Palaeoclimatology, Palaeoecology

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“…Tree-ring chronologies (TRCs) are an important source of information in large-scale temperature reconstructions (IPCC, 2013;St. George, 2014).…”

Section: Introductionmentioning

confidence: 99%

Ranking of tree-ring based temperature reconstructions of the past millennium

Esper

Krusic

Ljungqvist

et al. 2016

Quaternary Science Reviews

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a b s t r a c tTree-ring chronologies are widely used to reconstruct high-to low-frequency variations in growing season temperatures over centuries to millennia. The relevance of these timeseries in large-scale climate reconstructions is often determined by the strength of their correlation against instrumental temperature data. However, this single criterion ignores several important quantitative and qualitative characteristics of tree-ring chronologies. Those characteristics are (i) data homogeneity, (ii) sample replication, (iii) growth coherence, (iv) chronology development, and (v) climate signal including the correlation with instrumental data. Based on these 5 characteristics, a reconstruction-scoring scheme is proposed and applied to 39 published, millennial-length temperature reconstructions from Asia, Europe, North America, and the Southern Hemisphere. Results reveal no reconstruction scores highest in every category and each has their own strengths and weaknesses. Reconstructions that perform better overall include N-Scan and Finland from Europe, E-Canada from North America, Yamal and Dzhelo from Asia. Reconstructions performing less well include W-Himalaya and Karakorum from Asia, Tatra and S-Finland from Europe, and Great Basin from North America. By providing a comprehensive set of criteria to evaluate tree-ring chronologies we hope to improve the development of large-scale temperature reconstructions spanning the past millennium. All reconstructions and their corresponding scores are provided at www.blogs.uni-mainz.de/fb09climatology.

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An overview of tree-ring width records across the Northern Hemisphere

Cited by 186 publications

References 194 publications

Regime shifts of Mediterranean forest carbon uptake and reduced resilience driven by multidecadal ocean surface temperatures

Regime shifts of Mediterranean forest carbon uptake and reduced resilience driven by multidecadal ocean surface temperatures

A tree-ring based reconstruction of summer relative humidity variability in eastern Mongolian Plateau and its associations with the Pacific and Indian Oceans

Ranking of tree-ring based temperature reconstructions of the past millennium

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