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A 1500-Year Reconstruction of Annual Mean Temperature for Temperate North America on Decadal-to-Multidecadal Time Scales
Presented by Dr. Valerie TROUET on 14 May 2013 from 14:50 to 15:10
Type: Oral Presentation
Session: Climate of Recent Millennia I
Track: Climate of recent millennia
We present two reconstructions of annual average temperature over temperate North America: a tree-ring based reconstruction at decadal resolution (1200–1980 CE) and a pollen-based reconstruction at 30-year resolution that extends back to 480 CE. The tree-ring based reconstruction was calibrated against instrumental temperatures, was then reduced to a lower resolution and used as a calibration target for the pollen-based reconstruction. There are three prominent pre-industrial low-frequency periods in our extended reconstruction: the Dark Ages cool period (500–700 CE), Little Ice Age (1300–1850 CE), and the Medieval Climate Anomaly (MCA; 800–1200 CE). The 9th and the 11th Century are the warmest centuries and they constitute the core of the MCA in our reconstruction. These two warm peaks are slightly warmer than the baseline period, but nevertheless much cooler than North American temperatures during the early 21st Century.
Room: Salon B