Angola-Benguela Front ODP1078C 25KYr Alkenone SST Reconstructions ----------------------------------------------------------------------- World Data Center for Paleoclimatology, Boulder and NOAA Paleoclimatology Program ----------------------------------------------------------------------- NOTE: PLEASE CITE ORIGINAL REFERENCE WHEN USING THIS DATA!!!!! NAME OF DATA SET: Angola-Benguela Front ODP1078C 25KYr Alkenone SST Reconstructions LAST UPDATE: 6/2011 (Original receipt by WDC Paleo) CONTRIBUTORS: Kim, J.-H., R.R. Schneider, S. Mulitza, and P.J. Müller IGBP PAGES/WDCA CONTRIBUTION SERIES NUMBER: 2011-086 WDC PALEO CONTRIBUTION SERIES CITATION: Kim, J.-H., et al. 2011. Angola-Benguela Front ODP1078C 25KYr Alkenone SST Reconstructions. IGBP PAGES/World Data Center for Paleoclimatology Data Contribution Series # 2011-086. NOAA/NCDC Paleoclimatology Program, Boulder CO, USA. ORIGINAL REFERENCE: Kim, J.-H., R.R. Schneider, S. Mulitza, and P.J. Müller. 2003. Reconstruction of SE trade-wind intensity based on sea-surface temperature gradients in the Southeast Atlantic over the last 25 kyr. Geophys. Res. Lett., 30(22), 2144, doi:10.1029/2003GL017557. ABSTRACT: A prominent feature in the Southeast Atlantic is the Angola-Benguela Front (ABF), the convergence between warm tropical and cold subtropical upwelled waters. At present, the sea-surface temperature (SST) gradient across the ABF and its position are influenced by the strength of southeasterly (SE) trade winds. Here, we present a record of changes in the ABF SST gradient over the last 25 kyr. Variations in this SST contrast indicate that periods of strengthened SE trade-wind intensity occurred during the Last Glacial Maximum, the Younger Dryas, and the Mid to Late Holocene, while Heinrich Event 1, the early part of the Bølling-Allerød, and the Early Holocene were periods of weakened SE trade-winds. ADDITIONAL REFERENCES: Müller, P.J., G. Kirst, G. Ruhland, I. von Storch, and A. Rosell-Mele. 1998. Calibration of the alkenone palaeotemperature index UK'37 based on core-tops from the eastern South Atlantic and the global ocean (601N-601S). Geochimica et Cosmochimica Acta 62, 1757–1772. Rühlemann, C., S. Mulitza, G. Lohmann, A. Paul, M. Prange, G. Wefer. 2004. Intermediate depth warming in the tropical Atlantic related to weakened thermohaline circulation: Combining paleoclimate and modeling data for the last deglaciation. Paleoceanography, 19, PA1025. GEOGRAPHIC REGION: Southeast Atlantic PERIOD OF RECORD: 25 KYrBP - present FUNDING SOURCES: German Ministry of Research and Education (BMBF) through the DEKLIM, DFG Research Centre Ocean Margins. DESCRIPTION: Alkenone sea-surface temperature (SST) estimates for the past 33 kyr from a sediment core located near the modern Angola-Benguela Front. Core ODP-1078C: 11°55.2'S, 13°24'E, 426m depth DATA: 1. AMS 14C dates, ODP1078C Comment: Radiocarbon ages were determined on samples of mixed planktic foraminifera and mollusk fragments. Column 1: DEPTH, sediment [m] Column 2: Sample code/label Column 3: Age, dated [ka] Column 4: Age, dated, lower confidence level [ka -] Column 5: Age, dated, upper confidence level [ka +] Column 6: Age, dated [ka] calibrated, CALIB 4.3 (Stuiver et al., 1998) Column 7: Dated material Column 8: Sample Lab number Column 9: Comment Depth Sample Code Label Age AgeLCL AgeUCL AgeCalib Dated material Lab no Comment 0.31 175-1078C-1H-1,30-32 1.07 0.035 0.035 0.64 planktic forams, otholits KIA13022 0.91 175-1078C-1H-1,90-92 2.49 0.04 0.04 2.13 planktic forams KIA13021 1.735 175-1078C-1H-2,22.5-24.5 4.21 0.035 0.035 4.29 planktic forams KIA16170 1.985 175-1078C-1H-2,47.5-49.5 4.9 0.035 0.035 5.26 planktic forams KIA16169 2.61 175-1078C-1H-2,110-112 6.685 0.045 0.045 7.22 planktic forams, fract. mollusks KIA13018 3.31 175-1078C-1H-3,30-32 8.57 0.06 0.06 9 planktic forams, fract. mollusks KIA13036 3.61 175-1078C-1H-3,60-62 8.93 0.07 0.07 9.55 snail KIA13035 4.51 175-1078C-1H-4,0-2 9.52 0.07 0.07 10.28 mollusks KIA13017 6.01 175-1078C-1H-5,0-2 10.92 0.09 0.09 12.52 planktic forams, fract. mollusks KIA13016 7.11 175-1078C-2H-1,40-42 12.11 0.09 0.09 13.74 fract. mollusk, scaphopods KIA13025 Average of 2 samples to determine the calendar age for 711cm sediment depth 7.11 175-1078C-2H-1,40-42 12.26 0.09 0.09 13.82 fract. mollusk, scaphopods KIA13014 Average of 2 samples to determine the calendar age for 711cm sediment depth 7.81 175-1078C-2H-1,110-112 12.73 0.08 0.08 14.15 fract. mollusks KIA13013 8.71 175-1078C-2H-2,50-52 15.53 0.12 0.12 17.98 fract. mollusks KIA13026 9.01 175-1078C-2H-2,80-82 16.99 0.13 0.13 19.66 planktic forams KIA13010 9.31 175-1078C-2H-2,110-112 17.79 0.14 0.14 20.58 fract. mollusks KIA13009 9.61 175-1078C-2H-2,140-142 15.78 0.12 0.12 18.26 fract. mollusks KIA13034 Not used for the age model 9.71 175-1078C-2H-3,0-2 16.61 0.12 0.13 19.22 fract. mollusks KIA13032 Not used for the age model 9.81 175-1078C-2H-3,38331 19.07 0.17 0.17 22.05 fract. mollusks KIA13031 2. Kim et al. 2003 ODP1078C Alkenone SST Data Column 1: DEPTH, sediment [m] Column 2: AGE [ka BP] Column 3: Sample code/label Column 4: Alkenone, unsaturation index UK`37 Column 5: Sea surface temperature, annual mean [°C] calculated from (Müller et al, 1998) Depth Age Sample Label UK`37 SST°C 0.01 0.02 175-1078C-1H-1,0-2 0.86 24.8 0.11 0.23 175-1078C-1H-1,10-12 0.86 24.8 0.21 0.43 175-1078C-1H-1,20-22 0.87 25 0.31 0.64 175-1078C-1H-1,30-32 0.87 25 0.41 0.89 175-1078C-1H-1,40-42 0.86 24.8 0.51 1.14 175-1078C-1H-1,50-52 0.87 25 0.61 1.39 175-1078C-1H-1,60-62 0.86 24.8 0.71 1.64 175-1078C-1H-1,70-72 0.87 24.9 0.81 1.88 175-1078C-1H-1,80-82 0.86 24.7 0.91 2.13 175-1078C-1H-1,90-92 0.86 24.7 1.01 2.39 175-1078C-1H-1,100-102 0.86 24.8 1.11 2.65 175-1078C-1H-1,110-112 0.86 24.8 1.21 2.91 175-1078C-1H-1,120-122 0.86 24.8 1.31 3.17 175-1078C-1H-1,130-132 0.86 24.7 1.41 3.43 175-1078C-1H-1,140-142 0.86 24.6 1.51 3.69 175-1078C-1H-2,0-2 0.85 24.4 1.61 3.96 175-1078C-1H-2,10-12 0.84 24.2 1.71 4.22 175-1078C-1H-2,20-22 0.84 24.1 1.81 4.56 175-1078C-1H-2,30-32 0.84 24.1 1.91 4.95 175-1078C-1H-2,40-42 0.84 24 2.01 5.32 175-1078C-1H-2,50-52 0.85 24.3 2.11 5.64 175-1078C-1H-2,60-62 0.85 24.3 2.21 5.96 175-1078C-1H-2,70-72 0.85 24.5 2.31 6.27 175-1078C-1H-2,80-82 0.85 24.5 2.41 6.59 175-1078C-1H-2,90-92 0.85 24.4 2.51 6.91 175-1078C-1H-2,100-102 0.86 24.6 2.61 7.22 175-1078C-1H-2,110-112 0.84 24.2 2.71 7.48 175-1078C-1H-2,120-122 0.84 24.1 2.81 7.73 175-1078C-1H-2,130-132 0.84 24.1 2.91 7.98 175-1078C-1H-2,140-142 0.83 23.7 3.01 8.24 175-1078C-1H-3,0-2 0.83 23.8 3.11 8.49 175-1078C-1H-3,10-12 0.83 23.8 3.21 8.74 175-1078C-1H-3,20-22 0.83 23.9 3.31 9 175-1078C-1H-3,30-32 0.82 23.6 3.41 9.18 175-1078C-1H-3,40-42 0.83 23.7 3.51 9.36 175-1078C-1H-3,50-52 0.82 23.6 3.61 9.55 175-1078C-1H-3,60-62 0.82 23.5 3.71 9.63 175-1078C-1H-3,70-72 0.82 23.6 3.81 9.71 175-1078C-1H-3,80-82 0.82 23.6 3.91 9.79 175-1078C-1H-3,90-92 0.83 23.8 4.01 9.87 175-1078C-1H-3,100-102 0.83 23.7 4.11 9.95 175-1078C-1H-3,110-112 0.83 23.8 4.21 10.04 175-1078C-1H-3,120-122 0.83 23.8 4.31 10.12 175-1078C-1H-3,130-132 0.83 23.7 4.41 10.2 175-1078C-1H-3,140-142 0.83 23.8 4.51 10.28 175-1078C-1H-4,0-2 0.83 23.7 4.61 10.43 175-1078C-1H-4,10-12 0.83 23.7 4.71 10.58 175-1078C-1H-4,20-22 0.82 23.5 4.81 10.73 175-1078C-1H-4,30-32 0.82 23.5 4.91 10.88 175-1078C-1H-4,40-42 0.82 23.5 5.01 11.03 175-1078C-1H-4,50-52 0.82 23.5 5.11 11.18 175-1078C-1H-4,60-62 0.82 23.4 5.21 11.32 175-1078C-1H-4,70-72 0.82 23.5 5.31 11.47 175-1078C-1H-4,80-82 0.82 23.6 5.41 11.62 175-1078C-1H-4,90-92 0.82 23.4 5.51 11.77 175-1078C-1H-4,100-102 0.82 23.5 5.61 11.92 175-1078C-1H-4,110-112 0.82 23.6 5.71 12.07 175-1078C-1H-4,120-122 0.83 23.7 5.81 12.22 175-1078C-1H-4,130-132 0.82 23.6 5.91 12.37 175-1078C-1H-4,140-142 0.82 23.5 6.01 12.52 175-1078C-1H-5,0-2 0.83 23.7 6.11 12.63 175-1078C-1H-5,10-12 0.82 23.5 6.21 12.74 175-1078C-1H-5,20-22 0.82 23.6 6.31 12.85 175-1078C-1H-5,30-32 0.81 23.2 6.47 13.03 175-1078C-1H-CC,0-2 0.81 23.1 6.57 13.14 175-1078C-1H-CC,10-12 0.8 22.9 6.71 13.3 175-1078C-2H-1,0-2 0.81 23.2 6.81 13.41 175-1078C-2H-1,10-12 0.81 23.2 6.91 13.52 175-1078C-2H-1,20-22 0.8 23 7.01 13.63 175-1078C-2H-1,30-32 0.8 23 7.11 13.74 175-1078C-2H-1,40-42 0.8 23 7.21 13.8 175-1078C-2H-1,50-52 0.8 22.8 7.31 13.86 175-1078C-2H-1,60-62 0.78 22.2 7.41 13.92 175-1078C-2H-1,70-72 0.78 22.3 7.51 13.97 175-1078C-2H-1,80-82 0.79 22.5 7.61 14.03 175-1078C-2H-1,90-92 0.78 22.3 7.71 14.09 175-1078C-2H-1,100-102 0.79 22.7 7.81 14.15 175-1078C-2H-1,110-112 0.78 22.4 7.91 14.57 175-1078C-2H-1,120-122 0.78 22.3 8.01 15 175-1078C-2H-1,130-132 0.77 22.1 8.11 15.42 175-1078C-2H-1,140-142 0.78 22.3 8.21 15.85 175-1078C-2H-2,0-2 0.77 22.1 8.31 16.27 175-1078C-2H-2,10-12 0.73 20.9 8.41 16.7 175-1078C-2H-2,20-22 0.75 21.5 8.51 17.12 175-1078C-2H-2,30-32 0.75 21.5 8.61 17.55 175-1078C-2H-2,40-42 0.77 21.8 8.71 17.98 175-1078C-2H-2,50-52 0.77 21.9 8.81 18.54 175-1078C-2H-2,60-62 0.77 22.1 8.91 19.09 175-1078C-2H-2,70-72 0.79 22.7 9.01 19.66 175-1078C-2H-2,80-82 0.78 22.4 9.11 19.96 175-1078C-2H-2,90-92 0.77 22.1 9.21 20.27 175-1078C-2H-2,100-102 0.78 22.3 9.31 20.58 175-1078C-2H-2,110-112 0.79 22.7 9.41 20.87 175-1078C-2H-2,120-122 0.79 22.5 9.51 21.16 175-1078C-2H-2,130-132 0.78 22.4 9.59 21.4 175-1078C-2H-2,138-140 0.77 21.8 9.71 21.75 175-1078C-2H-3,0-2 0.78 22.4 9.81 22.05 175-1078C-2H-3,10-12 0.8 23 9.91 22.59 175-1078C-2H-3,20-22 0.79 22.5 10.01 23.12 175-1078C-2H-3,30-32 0.78 22.2 10.11 23.66 175-1078C-2H-3,40-42 0.76 21.8 10.21 24.2 175-1078C-2H-3,50-52 0.76 21.8 10.31 24.74 175-1078C-2H-3,60-62 0.76 21.5