Ring-width and blue-light chronologies of <i>Podocarpus lawrencei</i> from southeastern mainland Australia reveal a regional climate signal

O'Connor, Jacinda; Henley, Benjamin J.; Brookhouse, Matthew; Allen, Kathryn

doi:10.5194/cp-18-2567-2022

Cited by 3 publications

(1 citation statement)

References 60 publications

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“…Recently, some attempts have been made to explore the utility of BI for dendroclimatology in Australia (Wilson et al, 2021;Brookhouse and Graham, 2016;Blake et al, 2020;O'connor et al, 2022) and Asia https://doi.org/10.5194/egusphere-2023-135 Preprint. Discussion started: 2 March 2023 c Author(s) 2023.…”

Section: Introductionmentioning

confidence: 99%

Experiments of the efficacy of tree ring blue intensity as a climate proxy in central and western China

Zheng

Shen

Abernethy

et al. 2023

Preprint

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Abstract. To investigate the potential value of blue intensity as a robust climate proxy in central and western China, 4 species from 5 sites were assessed. As well as latewood inverted BI (LWBinv), we also examined earlywood BI (EWB). To explore the sensitivity of using different extraction parameter settings using CooRecorder, seven percentile variant settings for EWB and LWBinv were used; F50:50 to F95:05. The RW, EWB, and LWBinv were detrended using an age-dependent spline. Correlation analysis was applied between the tree ring parameter chronologies and monthly/seasonal variables of mean temperature, precipitation, and scPDSI. Linear regression was also used to further highlight the potential of developing climate reconstructions using these species. Only subtle differences were found between the different percentile extraction variants. However, the analysis suggested that F80:20 or F85:15 variants marginally provided better performance. As has been shown for many other northern hemisphere studies, inverse latewood intensity expresses a strong positive relationship with growing season temperatures (the two southern sites explaining almost 60 % of the temperature variance when combined). However, the low latitude of these sites shows exciting potential for regions south of 30° N that are traditionally not targeted for temperature reconstructions. EWB also shows good potential to reconstruct hydroclimate parameters in some humid areas.

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Section: Introductionmentioning

confidence: 99%

Experiments of the efficacy of tree ring blue intensity as a climate proxy in central and western China

Zheng

Shen

Abernethy

et al. 2023

Preprint

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Blue intensity of Swiss stone pine as a high-frequency temperature proxy in the Alps

et al. 2023

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Tree rings are widely used for climatic reconstructions and for improving our understanding of ongoing climate change in high-altitude sensitive areas. X-ray maximum latewood density is a very powerful parameter to reconstruct past climatic variations, especially if compared to tree-ring width, but this method is neither inexpensive nor timesaving. However, blue intensity (BI) has resulted in an excellent maximum wood density surrogate that measures the intensity of reflected light from latewood in the blue spectra. This methodology is still considered a prototype parameter, and more data are needed for validation of the method. We present the first BI values coming from Swiss stone pine (Pinus cembra L.) collected on the southern margin of the Alps. Analyses were performed by testing different solvents and polishing techniques, as well as different CooRecorder pixel percentage settings. The results demonstrate that solvents and software parameters have little influence on the final chronologies. Dendroclimatic analyses demonstrate that Swiss stone pine BI can be a useful tool to extract at least the high-frequency variations in July–August temperatures with a correlation coefficient of up to 0.6 (over the 1800–2017 time period). The immunity of Swiss stone pine to insect defoliator outbreaks further enhances the reliability of the BI values of this species in reconstructing past high-frequency temperature variations in high-altitude sensitive areas.

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Experiments of the efficacy of tree ring blue intensity as a climate proxy in central and western China

Zheng,

Shen,

Abernethy

et al. 2023

Biogeosciences

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Abstract. To investigate the potential value of tree ring blue intensity as a robust climate proxy in central and western China, four species from five sites were assessed. As well as latewood inverted blue intensity, we also examined earlywood blue intensity. To explore the sensitivity of using different extraction parameter settings using the software CooRecorder, seven percentile (P) variant settings for earlywood blue intensity and latewood inverted blue intensity were used, namely P50 : 50, P60 : 40, P70 : 30, P80 : 20, P85 : 15, P90 : 10, and P95 : 5. Age-dependent spline was used for all, and the positive trends were not retained. Correlation analysis was applied between the tree ring parameter chronologies and monthly/seasonal mean temperature, precipitation, and self-calibrated Palmer drought severity index variables. Linear regression was also used to further highlight the potential of developing climate reconstructions using these species. Only subtle differences were found between the different percentile extraction variants. As has been shown for many other Northern Hemisphere studies, latewood inverted blue intensity expresses a strong positive relationship with growing-season temperatures (the two southern sites explain almost 56 % of the temperature variance when combined). However, the low latitude of these sites shows an exciting potential for regions south of 30∘ N that are traditionally not targeted for temperature reconstructions. Earlywood blue intensity also shows good potential to reconstruct hydroclimate parameters in some humid areas.

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Ring-width and blue-light chronologies of Podocarpus lawrencei from southeastern mainland Australia reveal a regional climate signal

Cited by 3 publications

References 60 publications

Experiments of the efficacy of tree ring blue intensity as a climate proxy in central and western China

Experiments of the efficacy of tree ring blue intensity as a climate proxy in central and western China

Blue intensity of Swiss stone pine as a high-frequency temperature proxy in the Alps

Experiments of the efficacy of tree ring blue intensity as a climate proxy in central and western China

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