Bruce Plateau, Antarctic Peninsula 100yr Ice Core d18O and Accumulation Goodwin, B.P.; Mosley-Thompson, E.; Wilson, A.B.; Porter, S.E.; Sierra-Hernandez, M.R. Goodwin, B.P. Mosley-Thompson, E. Wilson, A.B. Porter, S.E. Sierra-Hernandez, M.R. Pacific Decadal Oscillation Southern Annular Mode (SAM) earth science/paleoclimate/ice cores (ice age,null,null,year Common Era,null,ice cores,null,null,N,null) earth science/paleoclimate/ice cores (accumulation rate,bulk ice,null,meter per year,null,ice cores,null,null,N,annual counting by (MSA); meters of water equivalent) earth science/paleoclimate/ice cores (delta 18O,bulk ice,null,per mil SMOW,null,ice cores,averaged,cavity ring-down spectroscopy,N,annual averages) earth science/paleoclimate/ice core earth science/paleoclimate/ice core (Bruce Plateau>LATITUDE -66.038>LONGITUDE -64.078) A new ice core drilled in 2010 to bedrock from the Bruce Plateau (BP) on the Antarctic Peninsula (AP) provides a high temporal resolution record of environmental conditions in this region. The extremely high annual accumulation rate at this site facilitates analysis of the relationships between annual net accumulation An on the BP and large-scale atmospheric oscillations. Over the last ~45 years, An on the BP has been positively correlated with both the southern annular mode (SAM) and Southern Oscillation index (SOI). Extending this analysis back to 1900 reveals that these relationships are not temporally stable, and they exhibit major shifts in the late-1940s and the mid-1970s that are contemporaneous with phase changes in the Pacific decadal oscillation (PDO). These varying multidecadal characteristics of the An-oscillation relationships are not apparent when only data from the post-1970s era are employed. Analysis of the longer ice core record reveals that the influence of the SAM on An depends not only on the phase of the SAM and SOI but also on the phase of the PDO. When the SAM's influence on BP An is reduced, such as under negative PDO conditions, BP An is modulated by variability in the tropical and subtropical atmosphere through its impacts on the strength and position of the circumpolar westerlies in the AP region. These results demonstrate the importance of using longer-term ice core-derived proxy records to test conventional views of atmospheric circulation variability in the AP region. STUDY NOTES: Antarctic Peninsula oxygen isotope (d18O) and accumulation rate data from an ice core drilled on Bruce Plateau. NCDC-Paleoclimatology https://www.ncdc.noaa.gov/data-access/paleoclimatology-data - Bauer Bruce Investigator : Goodwin, B.P. Investigator : Mosley-Thompson, E. Investigator : Wilson, A.B. Investigator : Porter, S.E. Investigator : Sierra-Hernandez, M.R. 2016-07-22 ONLINE Files online, ASCII https://www.ncdc.noaa.gov/paleo/study/20350 https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/antarctica/bruce/bruce2016accum.txt https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/antarctica/bruce/bruce2016d18o.txt https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/antarctica/bruce/bruce2016accum.txt https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/antarctica/bruce/bruce2016d18o.txt English https://www.ncdc.noaa.gov/paleo/study/20350 https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/antarctica/bruce/bruce2016accum.txt https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/antarctica/bruce/bruce2016d18o.txt Bradley P. Goodwin, Ellen Mosley-Thompson, Aaron B. Wilson, Stacy E. Porter, M. Roxana Sierra-Hernandez2016Accumulation Variability in the Antarctic Peninsula: The Role of Large-Scale Atmospheric Oscillations and Their InteractionsJournal of Climate2972579-259610.1175/JCLI-D-15-0354.1http://journals.ametsoc.org/doi/full/10.1175/JCLI-D-15-0354.1 START YEAR: 1900 AD * END YEAR: 2009 AD -64.078 -66.038 -64.078 -66.038