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1 July 2016 Application of the Minimum Blue-Intensity Technique To A Southern-Hemisphere Conifer
Matthew Brookhouse, Rochelle Graham
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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.

Copyright © 2016 by The Tree-Ring Society
Matthew Brookhouse and Rochelle Graham "Application of the Minimum Blue-Intensity Technique To A Southern-Hemisphere Conifer," Tree-Ring Research 72(2), 103-107, (1 July 2016).
Received: 16 February 2016; Accepted: 1 May 2016; Published: 1 July 2016
Australian Alps
growing season
maximum temperature
Podocarpus lawrencei
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