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Tree ring width data from Willow Lake in Canada's Northwest Territories provides a 138-year climate proxy record. The chronology spans from 100 to -38 calendar years before present, indicating it extends into the future relative to the 1950 baseline. This archived study is maintained by NOAA's National Centers for Environmental Information under its World Data Service for Paleoclimatology.
Time notation uses calendar years before present (BP), where 'present' is 1950; negative values indicate years after 1950. Users must cite the study when using the data.