Journal
TREES FORESTS AND PEOPLE
Volume 1, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.tfp.2020.100009
Keywords
Climatology; Dendroclimatology; Longleaf pine; Southeastern United States; Summer precipitation
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Tree-ring based precipitation reconstructions are beneficial in placing interannual variability in an historical context. However, absent specificity on what is being modeled (e.g., event type or rainfall intensity), similar rainfall totals inferred from reconstructions between different years imply similar conditions. Consequently, variability in specific precipitation event types or intensity can affect radial growth widths despite no changes in overall precipitation amount. Here, we use a longleaf pine latewood chronology to demonstrate how infrequent, intense (i.e., > 2.0 SD above mean) rainfall events (IREs), representing similar to 50% of total summer (July-September) precipitation amounts and 14.1% of rainfall events, principally determine interannual variability (R-2 = 40.7%) in latewood while total summer rainfall amounts excluding IREs provide minimal explanatory power (R-2 = 10.4%). These results suggest that slight decreases in IRE frequency can promote significant reductions in latewood growth indicating strong sensitivity to minor changes in climate.
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