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Multi-species analyses of the blue reflectance as a climate proxy in mountain environment
Paper ID : 1021-ADA2013
Authors:
Barbara Marta Czajka *1, Ryszard Jerzy Kaczka2
1Bedzinska St. 60, 41-200 Sosnowiec
2Bedzinska 60 41-200 Sosnowiec Poland
Abstract:
Through decades of research various proxies related to tree-ring have been developed. One of the most recent inventions is the use of the image analyses of blue spectrum reflectance of the wood, (Blue Reflectance, BR). Here we present the results of the analyses of the blue reflectance for sixe coniferous spices which grow in Tatra Mountains within subalpine (Larix decidua Mill., Picea abies (L.) Karst., Pinus Cembra (L.), Pinus mugo Turra) and montane (Abies alba (L.) Karst., Pinus sylvestris (L.)) zones. We aimed at testing the potential of BR as climate proxy comparing to tree-ring width (TRW) and in two cases to maximum wood density (MXD) records (spruce and larch) existing for that region. We investigated complete set of coniferous spices grow in Tatras and entire Carpathians.
The samples selected form Tatra’s collection were scanned and blue reflectance and TRW were measured using the CooRecorder 7.6 software (Cybis Elektronik & Data AB). The standard technics of verification (visual cross-dating and Cofecha test) and chronology computing (Arstan) were employed. The BR and the TRW chronologies for each species were built. Signal strength of both the BR and the TRW chronologies was compared by the inter-series correlation (Rbar), and the Expressed Population Signal (EPS) revealing higher values for the first proxy.
Correlation analysis between the BR, TRW and MXD chronologies and climate data was undertaken over the 1901–2006 period, using an 18-month window from May of the year prior to tree growth until the current-year October.
Growth response to climate analysis of the BR and TRW chronologies shows respectively rather consistent response to current-year spring-summer (April-August) and high summer (June- July) temperature. The BR chronologies of all species show the higher response to climate than TRW and comparable with MXD ones. The presented results lead to the conclusion that the BR proxy has potential as proxy use for dating and also for climate reconstruction (after addressing some issues related e.g. to setting the common standards).
Keywords:
blue reflectance, maximum wood density, Tatras, growth/climate response, climate reconstruction
Status : Abstract Accepted