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Streamflow Signal in Annual Ring Widths of Cottonwood Trees along Little Missouri River, North Dakota
Presented by David MEKO on 17 May 2013 from 10:30 to 10:50
Type: Oral Presentation
Ring widths of 394 Populus deltoides, ssp. monilifera trees from a relatively undisturbed setting in the North Unit of Theodore Roosevelt National Park, North Dakota, are analyzed for potential use in reconstructing the flow of the Little Missouri River. Results indicate that a single well-replicated age-curve-standardized (ACS) (similar to regional-curve standardization) cottonwood chronology explains 46% of the variance of log-transformed seasonal-total (April-July) flow of this river over a 1935-1999 calibration period. The signal is relatively strong in young-age rings (ages 5-35), presumably because of the proximity of young trees to the migrating river course, and can be enhanced by including chronologies of other species from non-riparian sites in the reconstruction model. Results could lead to improved streamflow reconstruction modeling with better retention of low-frequency climate signal.