ROCKY MOUNTAIN HYDROCLIMATIC VARIABILITY AT MULTI-DECADAL TO MILLENNIAL TIME SCALES
This talk will review recently obtained sediment-carbonate oxygen isotope records with decade-to-century resolution from lakes within the North American cordillera. Individually, the records reflect some degree of variance related to their respective regional hydroclimate, whereas their comparison elucidates similarities that are best explained by regional hydroclimatic change. This overview of the records will summarize new insights into broader North Pacific atmospheric circulation patterns and shifts at multi-decadal to millennial time scales that are shown to coincide with changes in solar insolation, ENSO/PDO and the North American Monsoon. Additional comparisons are made with marine proxy data along the northeast Pacific margin and tree-ring networks. Recognizing and understanding the natural behavior of Pacific atmosphere-ocean dynamics is of particular importance for climate model verification and evaluating forest ecosystems and fire. Advances in our understanding of these relationships will require a long-term perspective that Holocene proxy records of hydroclimate can provide.