Ice core evidence for significant 100-year regional warming on the Antarctic Peninsula

Details Ice core evidence for significant 100-year regional warming on the Antarctic Peninsula Ice core evidence for significant 100-year regional warming on the Antarctic Peninsula

Oct 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009georl..3620704t&link_type=abstract

Geophysical Research Letters, Volume 36, Issue 20, CiteID L20704

Physics

9

Cryosphere: Ice Cores (4932), Geographic Location: Antarctica (4207), Global Change: Abrupt/Rapid Climate Change (4901, 8408), Atmospheric Processes: Paleoclimatology (0473, 4900), Atmospheric Processes: Climate Change And Variability (1616, 1635, 3309, 4215, 4513)

Scientific paper

We present a new 150-year, high-resolution, stable isotope record (δ 18O) from the Gomez ice core, drilled on the data sparse south western Antarctic Peninsula, revealing a ˜2.7°C rise in surface temperatures since the 1950s. The record is highly correlated with satellite-derived temperature reconstructions and instrumental records from Faraday station on the north west coast, thus making it a robust proxy for local and regional temperatures since the 1850s. We conclude that the exceptional 50-year warming, previously only observed in the northern Peninsula, is not just a local phenomena but part of a statistically significant 100-year regional warming trend that began around 1900. A suite of coupled climate models are employed to demonstrate that the 50 and 100 year temperature trends are outside of the expected range of variability from pre-industrial control runs, indicating that the warming is likely the result of external climate forcing.

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