8200BP Event Foraminifer Data and Winter/Summer SST Reconstruction ----------------------------------------------------------------------- World Data Center for Paleoclimatology, Boulder and NOAA Paleoclimatology Program ----------------------------------------------------------------------- NOTE: PLEASE CITE CONTRIBUTORS WHEN USING THIS DATA!!!!! NAME OF DATA SET: 8200BP Event Foraminifer Data and Winter/Summer SST Reconstruction LAST UPDATE: 6/2006 (Original receipt by WDC Paleo) CONTRIBUTOR: Mark Chapman, University of East Anglia IGBP PAGES/WDCA CONTRIBUTION SERIES NUMBER: 2006-065 SUGGESTED DATA CITATION: Ellison, C.R.W., et al. 2006. 8200BP Event Foraminifer Data and Winter/Summer SST Reconstruction. IGBP PAGES/World Data Center for Paleoclimatology Data Contribution Series # 2006-065. NOAA/NCDC Paleoclimatology Program, Boulder CO, USA. ORIGINAL REFERENCE: Ellison, C.R.W., M.R. Chapman, and I.R. Hall. 2006. Surface and Deep Ocean Interactions During the Cold Climate Event 8200 Years Ago. Science, Vol 312, Issue 5782, Pages 1929-1932, 30 June 2006. ABSTRACT: Evidence from a North Atlantic deep-sea sediment core reveals that the largest climatic perturbation in our present interglacial, the 8200-year event, is marked by two distinct cooling events in the subpolar North Atlantic at 8490 and 8290 years ago. An associated reduction in deep flow speed provides evidence of a significant change to a major downwelling limb of the Atlantic meridional overturning circulation. The existence of a distinct surface freshening signal during these events strongly suggests that the sequenced surface and deep ocean changes were forced by pulsed meltwater outbursts from a multistep final drainage of the proglacial lakes associated with the decaying Laurentide Ice Sheet margin. GEOGRAPHIC REGION: North Atlantic PERIOD OF RECORD: 9 - 7 KYrBP FUNDING SOURCES: Natural Environment Research Council (NERC) and NERC Radiocarbon Laboratory. DESCRIPTION: Foraminifer size, abundance, and oxygen isotope data, plus winter and summer sea surface temperature estimates. Core MD99-2251: 57°26.87’ N, 27°54.47’ W; 2620 m water depth DATA: Column 1: Composite depth (cm) - sample depth in core (cm) Column 2: Age (years B.P.) - calibrated calendrical age of the sample Column 3: SS - the mean size of the sortable silt fraction fraction (um) Column 4: N. pachyderma sinistral-coiling abundance - relative abundance of the polar foraminifer (%) Column 5: SST - sea surface temperature calculated for summer season (ºC) Column 6: SST - sea surface temperature calculated for winter season(ºC) Column 7: planktonic d18O - calcite d18O measured using Globigerina bulloides (per mil) Column 8: d18Oseawater - estimated d18O composition of seawater Depth Age SSmean N.pachy SumSST WinSST d18OGbull d18Osw cm. YrBP um (%) (ºC) (ºC) (‰) (‰) 1106 7200 17.61 1.68 11.51 7.71 1.14 -0.53 1108 7219 17.24 0.93 12.33 8.53 1.24 -0.24 1110 7238 17.77 2.47 11.85 8.19 1.35 -0.25 1112 7257 17.93 0.99 11.17 7.33 1.23 -0.53 1114 7276 17.94 1.44 12.22 8.42 1.60 0.10 1116 7295 19.19 2.51 12.35 8.46 1.39 -0.08 1118 7313 16.38 2.29 12.07 8.24 1.32 -0.23 1120 7332 18.12 3.56 12.60 8.70 1.10 -0.32 1122 7351 18.23 1.07 12.44 8.58 1.29 -0.17 1124 7370 17.90 2.34 10.76 7.18 1.53 -0.35 1126 7389 19.23 2.10 11.81 8.07 1.38 -0.23 1128 7408 18.87 1.62 11.80 8.13 1.00 -0.62 1130 7427 17.97 1.04 12.27 8.39 1.36 -0.15 1132 7445 17.30 0.70 11.72 7.98 1.25 -0.39 1134 7464 17.95 0.79 12.36 8.38 1.28 -0.21 1136 7483 18.60 1.72 12.50 8.43 1.47 0.01 1138 7502 18.60 1.55 12.53 8.64 1.21 -0.24 1140 7521 18.51 1.66 12.33 8.58 1.09 -0.41 1142 7540 18.88 0.51 12.14 8.35 1.03 -0.52 1144 7559 18.67 1.88 11.70 7.88 1.43 -0.23 1146 7577 17.97 0.36 11.64 7.63 1.33 -0.34 1148 7596 18.75 2.18 12.22 8.42 1.49 -0.04 1150 7615 17.48 1.10 12.19 8.18 1.44 -0.10 1152 7634 18.79 1.02 12.50 8.44 1.22 -0.24 1154 7653 18.84 2.95 12.36 8.38 1.64 0.14 1156 7672 17.80 1.97 12.50 8.43 1.63 0.17 1158 7691 18.11 1.32 12.04 8.11 1.32 -0.25 1160 7710 18.97 3.82 11.94 8.00 1.48 -0.12 1162 7728 18.95 0.60 12.24 8.25 1.39 -0.13 1164 7747 19.01 0.00 11.24 7.38 1.38 -0.39 1166 7766 18.30 0.96 11.85 8.06 1.52 -0.10 1168 7785 18.98 2.12 11.87 8.06 1.33 -0.29 1170 7805 18.68 1.29 12.50 8.43 1.36 -0.10 1172 7824 19.48 0.00 11.95 7.89 1.29 -0.31 1174 7844 20.09 1.32 12.40 8.56 1.22 -0.27 1176 7863 20.00 1.88 10.89 7.47 1.20 -0.66 1178 7883 21.14 0.50 12.50 8.43 1.21 -0.25 1180 7902 19.10 1.50 12.37 8.47 1.32 -0.17 1182 7922 20.05 0.96 11.98 8.02 n.a. n.a. 1184 7941 19.14 1.00 11.73 7.73 1.24 -0.41 1186 7961 17.72 1.39 10.98 7.50 1.23 -0.60 1188 7980 18.36 1.44 10.96 7.20 1.47 -0.37 1190 8000 18.16 1.68 10.98 7.50 1.46 -0.38 1192 8019 17.89 0.60 11.22 7.61 1.56 -0.22 1194 8039 18.71 0.73 10.67 7.05 1.19 -0.72 1196 8059 17.03 1.01 10.82 7.00 1.33 -0.54 1198 8078 16.01 1.70 11.17 7.33 1.40 -0.39 1200 8098 16.24 1.80 10.68 7.29 n.a. n.a. 1202 8117 16.54 2.25 10.40 6.76 1.27 -0.71 1204 8137 16.78 2.49 10.97 6.97 1.33 -0.52 1206 8156 16.51 0.93 10.44 6.78 1.39 -0.59 1208 8176 15.78 2.81 11.10 7.27 1.36 -0.45 1210 8195 16.51 2.17 11.00 7.09 1.09 -0.75 1212 8215 16.14 1.39 10.49 6.75 1.55 -0.41 1214 8234 15.79 3.87 11.00 7.08 1.46 -0.37 1216 8254 15.99 1.05 10.43 6.67 1.40 -0.57 1218 8273 16.07 4.76 9.89 6.49 1.50 -0.61 1220 8293 17.21 6.66 9.70 6.22 1.67 -0.49 1222 8313 16.87 4.71 9.50 6.23 1.38 -0.83 1224 8334 16.89 6.49 10.23 6.87 1.07 -0.96 1226 8354 17.65 2.66 10.65 6.92 1.37 -0.55 1228 8375 16.72 2.90 10.79 6.98 1.13 -0.76 1230 8395 17.18 4.64 10.94 7.34 1.51 -0.34 1232 8416 16.87 1.52 10.20 6.82 1.35 -0.68 1234 8436 17.20 2.86 11.85 7.97 1.26 -0.37 1236 8457 18.12 1.45 10.49 6.75 1.11 -0.85 1238 8477 17.17 4.60 10.66 6.87 0.91 -1.02 1240 8497 17.55 3.39 9.44 6.29 1.14 -1.09 1242 8518 18.77 4.82 10.40 7.01 1.35 -0.64 1244 8538 17.98 4.24 11.66 7.81 0.95 -0.73 1246 8559 17.76 1.00 10.67 7.04 1.58 -0.34 1248 8579 18.67 2.77 10.67 7.04 1.45 -0.48 1250 8600 18.24 2.07 10.94 7.50 1.55 -0.31 1252 8620 17.45 1.41 12.12 8.33 1.27 -0.30 1254 8640 18.71 2.11 10.67 7.04 1.30 -0.64 1256 8661 18.01 0.70 10.67 7.04 1.71 -0.22 1258 8681 18.75 2.05 10.32 6.75 1.32 -0.70 1260 8702 18.41 3.10 10.67 7.04 1.60 -0.34 1262 8722 18.30 1.01 11.22 7.69 1.52 -0.28 1264 8743 17.27 3.12 10.83 7.38 1.40 -0.50 1266 8763 18.13 0.62 10.40 7.00 1.40 -0.61 1268 8784 18.19 2.22 11.70 8.11 1.32 -0.37 1270 8804 19.08 1.53 10.40 7.01 1.33 -0.68 1272 8824 19.20 1.56 10.40 7.00 1.30 -0.72 1274 8845 17.67 2.91 10.83 7.40 1.35 -0.57 1276 8865 18.08 1.14 11.04 7.58 1.36 -0.50 1278 8886 19.12 0.86 11.04 7.58 1.31 -0.55 1280 8906 19.69 0.91 11.04 7.58 1.31 -0.55 1282 8927 17.35 0.96 11.04 7.42 1.42 -0.45 1284 8947 17.98 1.64 11.00 7.08 1.19 -0.68 1286 8959 18.41 0.82 11.85 7.98 1.39 -0.28 1288 8972 19.57 0.39 11.57 7.68 1.33 -0.41 1290 8984 17.87 1.75 12.04 8.24 1.17 -0.46 1292 8996 18.06 0.66 11.08 7.31 1.50 -0.36 1294 9009 18.37 1.44 11.77 7.80 1.23 -0.46 1296 9021 18.20 0.00 11.64 7.79 1.38 -0.34 1298 9033 17.98 1.01 11.30 7.70 1.47 -0.34 1300 9046 18.43 1.73 13.16 9.18 1.17 -0.19 1302 9058 18.01 2.29 12.24 8.41 1.10 -0.48 1304 9070 18.55 1.78 10.83 7.39 1.31 -0.62 1306 9083 18.26 1.29 10.83 7.39 1.26 -0.67 1308 9095 17.83 1.20 12.31 8.50 1.48 -0.09 1310 9107 18.47 1.42 11.17 7.48 1.10 -0.75 1312 9120 18.23 0.00 12.22 8.49 1.12 -0.47 1314 9132 19.40 1.33 11.65 8.06 1.07 -0.66 1316 9144 18.11 0.42 11.29 7.73 1.27 -0.55 1318 9157 18.73 1.83 10.83 7.40 1.12 -0.82 1320 9169 18.31 0.46 11.84 8.23 1.52 -0.17 1322 9181 17.75 0.95 11.70 8.04 1.38 -0.34 1324 9194 18.35 1.12 12.73 8.84 1.28 -0.20