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Refining Climatic Interpretations of Lower Forest Border Bristlecone Pine Tree-Ring Chronologies Over Recent Millennia
Presented by Thomas WILDING on 15 May 2013 from 18:00 to 21:00
Type: Poster Presentation
Session: Poster Session + Reception
Board #: 53
We developed a 750-year tree-ring chronology from Piñon pine trees growing near Grandview Campground (GVP) in the White Mountains to refine the Methuselah Walk bristlecone pine precipitation reconstruction (MWK) which failed to capture five of the ten driest years during its calibration period. GVP was significantly correlated with MWK over 1500–2009 (r = 0.7, p < 0.001) and tracked precipitation during three of the missed drought years. A period of low correlation between the chronologies from ~1600–1650 corresponds with an increase in autocorrelation in MWK and a decline in growth in bristlecone pine growing at the highest elevations of the White Mountains. This suggests cooler temperatures during that period may have reduced the sensitivity of MWK to precipitation. These results identify an opportunity to utilize piñon pine chronologies to refine precipitation estimates derived from lower-forest border bristlecone chronologies for at least the past millennium using a multi-species approach.
Room: Salon E