Auxiliary Material for Paper 2011GL049714 Western Arctic Ocean temperature variability during the last 8000 years Jesse R. Farmer U.S. Geological Survey, Reston, Virgina, USA Now at Lamont-Doherty Earth Observatory, Earth Institute at Columbia University, Palisades, New York, USA Thomas M. Cronin U.S. Geological Survey, Reston, Virgina, USA Anne de Vernal GEOTOP-UQAM-McGill, Montreal, Quebec, Canada Gary S. Dwyer Division of Earth and Ocean Sciences, Nicholas School of the Environment, Duke University, Durham, North Carolina, USA Lloyd D. Keigwin Woods Hole Oceanographic Institution, Woods Hole, Massachusetts, USA Robert C. Thunell Department of Earth and Ocean Sciences, University of South Carolina, Columbia, South Carolina, USA Farmer, J. R., T. M. Cronin, A. de Vernal, G. S. Dwyer, L. D. Keigwin, and R. C. Thunell (2011), Western Arctic Ocean temperature variability during the last 8000 years, Geophys. Res. Lett., 38, L24602, doi:10.1029/2011GL049714. Introduction This auxiliary material includes text and graphics associated with the establishment of chronology for cores HLY0205-GGC-19 and P1-92AR-P1/B3, detailed methodology for oxygen isotope, magnesium-calcium, and dinocyst assemblage proxies, establishment of uncertainty for our proxy temperature measurements, and a discussion of other factors outside of temperature which may influence our proxy reconstructions. 1. 2011gl049714-txts01.txt Text S1. Four sections: "Chronostratigraphy", "Methodology for Bottom Water Temperature Analyses", "Uncertainty in Bottom Water Temperature Analyses", and "Dinocyst Assemblages from GGC-19," along with additional references and captions for supplementary figures. 2. 2011gl049714-fs01.eps Figure S1. Age-depth profiles for cores HLY0205-GGC19 (A) and P1-92AR-P1/B3 (B). Box core B3 dates are denoted by blue squares; piston core P1 dates are denoted by black circles. 3. 2011gl049714-fs02.eps Figure S2. Benthic foraminiferal assemblages in GGC-19, expressed as number of specimens per gram of wet sediment. (a) N. labradoricum (blue) and I. helenae (red) representing the warm end-members, (b) E. excavatum (purple) and C. reinforme (yellow) representing the cold end-members. (c) Total benthic foraminiferal counts per gram wet sediment (black). Benthic foraminiferal abundance is generally highest from 7 to 6 ka, 5 to 3 ka, and around 1 ka, generally consistent with times of reduced surface sea-ice cover (see Figure 2 in manuscript). 4. 2011gl049714-fs03.eps Figure S3. Percentage of identified dinoflagellate cysts versus core depth for GGC-19. Two of the identified dinocysts, Selenopemphix nephroides and Polykrikos kofoidii, are rare in Arctic coretop but common from the North Pacific. Their low abundance (~2%) may represent transport by strong, erosive current in Barrow Canyon. 5. 2011gl049714-ts01.txt Table S1. Radiocarbon dates for cores GGC-19 and P1/B3 5.1 Column "Core", sediment core for radiocarbon date 5.2 Column "Depth", cm, depth in sediment core 5.3 Column "Composite Depth", cm, composite depth for P1/B3 5.4 Column "Material Dated", text, describes type of carbonate used for radiocarbon dating 5.5 Column "14C Age", years, age in radiocarbon years 5.6 Column "Calibrated Age, ?R=400", years, calendar ages for P1/B3 using 400 year reservoir correction 5.7 Column "Calibrated Age, ?R=506", years, calendar ages for GGC-19 using 506 year reservoir correction 5.8 Column "2-sigma range", years, plus-minus two standard deviation age range in calendar years 5.9 Column "Source", study from which radiocarbon date is sourced