Biogenic silica concentration as a high-resolution, quantitative temperature proxy at Hallet Lake, south-central Alaska

Details Biogenic silica concentration as a high-resolution, quantitative temperature proxy at Hallet Lake, south-central Alaska Biogenic silica concentration as a high-resolution, quantitative temperature proxy at Hallet Lake, south-central Alaska

Mar 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008georl..3505709m&link_type=abstract

Geophysical Research Letters, Volume 35, Issue 5, CiteID L05709

Other

7

Atmospheric Processes: Paleoclimatology (0473, 4900), Oceanography: General: Limnology (0458, 1845, 4942), Global Change: Regional Climate Change

Scientific paper

High-resolution, quantitative temperature records are valuable for placing recent warming in the context of long-term, natural climate variability. Here we use biogenic silica (BSi) concentrations preserved in lacustrine sediment from an oligotrophic lake to quantitatively reconstruct air temperature at Hallet Lake in south-central Alaska. Mean June through August temperature measured over the past 80 yr at Valdez (Alaska) correlate with BSi from Hallet Lake (r = 0.87, p = 0.01). We chose a nested function to model the non-linear relation between summer temperature and BSi in the calibration data set, and to reconstruct temperature for the past 2 ka. Our BSi-inferred temperature reconstruction shows synchronous changes with independent paleoclimatic proxies for southern Alaska, and provides evidence for a greater rate and magnitude of 20th century temperature warming at Hallet Lake than recorded by other quantitative temperature proxies in the region.

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