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A comparison of tree-ring inferred climate reconstructions from central Minnesota, USA, to 19th century US military fort climate data and high-resolution pollen-inferred climate data
Presented by Dr. Jeannine-Marie ST. JACQUES on 15 May 2013 from 10:00 to 10:20
Type: Oral Presentation
Session: Dendroclimatology I
A vital component of dendroclimatology is the validation of reconstructions. Given the scant instrumental data prior to the 20th century, the validation of dendroclimatological reconstructions largely depends on other proxy-inferred climate reconstructions. Here we compare a three-century tree-ring inferred central Minnesota moisture reconstruction based upon sites in Minnesota (e.g. Itasca Park) and adjacent North Dakota to 19th century climate data from nearby Fort Snelling, Minnesota. We also compare our tree-ring based reconstruction and those of other researchers to longer high-resolution pollen-inferred climate data from Lake Mina, Minnesota. The Lake Mina pollen record is dated by a varved-sediment chronology and sampled at a four-year resolution. The pollen-based climate reconstructions are based upon an early-European settlement period pollen-climate calibration set in order to minimize signal distortion and bias from the severe anthropogenic disturbance that has impacted the Midwest: selective logging, fire suppression, deforestation and agriculture.