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Environmental change in the subalpine environment of the southern Coast Mountains, British Columbia, during the past millennium
Presented by Johannes KOCH on 15 May 2013 from 18:00 to 21:00
Type: Poster Presentation
Session: Poster Session + Reception
Board #: 44
Glacier and treeline fluctuations in the subalpine region of the southern Coast Mountains have been reconstructed using dendroecologic methods. Glaciers in Garibaldi Provincial Park and the Pemberton Icefield allow detailed reconstructions of fluctuations during the past millennium. Glaciers advanced as early as the 11th, reached maxima in the 12th, and retreated in the 13th century. Glaciers reached maxima again in the 14thcentury, fluctuated around these advanced positions until the early 20th century, and since then have retreated significantly. This data is supplemented with studies at treeline and in subalpine meadows in Garibaldi Park covering nearly the last 500 years. The combined record shows synchronous albeit opposite behaviour of subalpine vegetation and glaciers: when glaciers advance, subalpine tree establishment ceases, but when glaciers retreat, tree establishment succeeds. Both records correspond with changes in the Pacific Decadal Oscillation, but also with global glacier and treeline fluctuations, and with changes in sunspot numbers.