Application of the Minimum Blue-Intensity Technique to A Southern-Hemisphere Conifer

Matthew Brookhouse; Rochelle Graham

doi:10.3959/1536-1098-72.02.103

Application of the Minimum Blue-Intensity Technique to A Southern-Hemisphere Conifer

Matthew Brookhouse^*, Rochelle Graham

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

11 Citations (Scopus)

Abstract

Minimum blue-intensity (BI) appears to be a viable source of proxy-temperature data, but is yet to be applied to a Southern-Hemisphere species. Here, we apply the BI technique to Podocarpus lawrencei, a conifer endemic to the Australian Alps. We develop sample-preparation protocols and examine the climate sensitivity of resulting tree-ring width (TRW) and BI chronologies. We found that extractable resins were removed from P. lawrencei samples after 28 hours of Soxhlet extraction and a highly-significant negative correlation (r =-0.79, p<0.0001) exists between the resulting BI chronology and growing season (August-April) temperature maxima. The climate sensitivity of our BI data, combined with an apparent teleconnection with a previously-reported dataset, suggests that an unparalleled opportunity exists to develop a powerful proxy for growing-season temperatures in southeast Australia.

Original language	English
Pages (from-to)	103-107
Number of pages	5
Journal	Tree-Ring Research
Volume	72
Issue number	2
DOIs	https://doi.org/10.3959/1536-1098-72.02.103
Publication status	Published - Jul 2016

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title = "Application of the Minimum Blue-Intensity Technique to A Southern-Hemisphere Conifer",

abstract = "Minimum blue-intensity (BI) appears to be a viable source of proxy-temperature data, but is yet to be applied to a Southern-Hemisphere species. Here, we apply the BI technique to Podocarpus lawrencei, a conifer endemic to the Australian Alps. We develop sample-preparation protocols and examine the climate sensitivity of resulting tree-ring width (TRW) and BI chronologies. We found that extractable resins were removed from P. lawrencei samples after 28 hours of Soxhlet extraction and a highly-significant negative correlation (r =-0.79, p<0.0001) exists between the resulting BI chronology and growing season (August-April) temperature maxima. The climate sensitivity of our BI data, combined with an apparent teleconnection with a previously-reported dataset, suggests that an unparalleled opportunity exists to develop a powerful proxy for growing-season temperatures in southeast Australia.",

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Application of the Minimum Blue-Intensity Technique to A Southern-Hemisphere Conifer

Abstract

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