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Tree-ring δ13C as a proxy for drought in New England
Presented by Stockton MAXWELL on 15 May 2013 from 18:00 to 21:00
Type: Poster Presentation
Session: Poster Session + Reception
Board #: 3
In this investigation, we assessed the utility of tree-ring width and δ13C from Tsuga canadensis and Quercus rubra trees growing at Harvard Forest, MA to reconstruct drought in New England. We conducted a correlation analysis between ring width, δ13C, and Palmer Drought Severity Index at varying spatial scales (forest stand to region) with data from 1991-2010. As expected, tree-ring width showed weak to moderate correlation with drought because of the prominence of stand dynamics at the Harvard Forest site. In contrast to ring width, the δ13C of tree rings is likely to have a strong correlation with drought because of the mechanistic link between carbon assimilation, CO2 concentrations, and climate. The most significant correlations were found with PDSI from May to August for T. canadensis and for May, July, and August for Q. rubra. We also investigated the spatial extent of the correlation between δ13C and drought in the KNMI explorer.