Eastern Equatorial Atlantic GeoB4905-4 21KYr Mg/Ca SST, SSS, and d18Osw ----------------------------------------------------------------------- World Data Center for Paleoclimatology, Boulder and NOAA Paleoclimatology Program ----------------------------------------------------------------------- NOTE: PLEASE CITE ORIGINAL REFERENCE WHEN USING THIS DATA!!!!! NAME OF DATA SET: Eastern Equatorial Atlantic GeoB4905-4 21KYr Mg/Ca SST, SSS, and d18Osw LAST UPDATE: 5/2011 (Original receipt by WDC Paleo) CONTRIBUTORS: Weldeab, S., R.R. Schneider, M. Kölling, and G. Wefer IGBP PAGES/WDCA CONTRIBUTION SERIES NUMBER: 2011-060 WDC PALEO CONTRIBUTION SERIES CITATION: Weldeab, S., et al. 2011. Eastern Equatorial Atlantic GeoB4905-4 21KYr Mg/Ca SST, SSS, and d18Osw. IGBP PAGES/World Data Center for Paleoclimatology Data Contribution Series # 2011-060. NOAA/NCDC Paleoclimatology Program, Boulder CO, USA. ORIGINAL REFERENCE: Weldeab, S., R.R. Schneider, M. Kölling, and G. Wefer. 2005. Holocene African droughts relate to eastern equatorial Atlantic cooling. Geology, Vol. 33, no. 12, pp. 981-984. doi: 10.1130/G21874.1 ABSTRACT: Here we present evidence that the Holocene African monsoon system (AMS) varied in response to the eastern equatorial Atlantic sea-surface temperature (SST). Several short-term episodes of decreased moisture availability as a result of low eastern equatorial Atlantic SST are suggested by planktonic foraminiferal Mg/Ca ratios. These episodes promoted a weakening of the AMS and thus determined the timing and intensity of arid periods. Local sea-surface salinities also reveal regional patterns of precipitation in equatorial western Africa. The high eastern equatorial Atlantic SSTs occur in concert with seasonally increased insolation at low latitudes, suggesting a strong response of African monsoonal precipitation to oceanic conditions at low latitudes. GEOGRAPHIC REGION: Eastern Equatorial Atlantic PERIOD OF RECORD: 21 KYrBP - present FUNDING SOURCES: European Community contract EVR1-CT-2001-40018 (CESOP) DESCRIPTION: Planktonic foraminiferal (Globigerinoides ruber pink) Mg/Ca and stable oxygen isotope (d18O) measurements, plus calculated Sea Surface Temperature (SST), Sea Surface Salinity (SSS), and d18O of sea water (d18Osw), from an eastern equatorial Atlantic sediment core (offshore Cameroon) for the past 21,000 years. Core GeoB4905-4: 02°30.0'N, 09°23.04'E, 1328m water depth. DATA: 1. Age control points GeoB4905-4 Column 1: Lab code Column 2: Core Depth (cm) Column 3: Material Column 4: 14C age (yrs) Column 5: 14C age error (yrs) Column 6: Calibrated Age (cal yrs BP) Column 7: Calibrated Age 2sigma range (cal yrs BP) Column 8: Core Depth (cm) Column 9: Depth (cm) Lab code Depth Material 14Cage 14Cerr. Calib.Age 2sigmaRange Reference KIA20514 5 G. r. p. 900 25 509 466-552 This study KIA23465 38.75 G. r. p. 3080 30 2849 2758-2939 This study KIA20513 73 G. r. p. 4840 35 5145 5016-5273 This study KIA20512 143 G. r. p. 7185 40 7654 7567-7741 This study KIA23466 190.25 G. r. p. 8710 40 9378 9281-9475 This study KIA20510 213 G. r. p. 9885 50 10824 10611-11037 This study KIA19673 258 G. r. p. 10900 60 12452 12200-12704 This study KIA20509 303 G. r. p. 12470 60 13919 13782-14056 This study KIA13717 343 m.pl foram. 13660 90 15730 15312-16147 Adegbie et al. 2003 KIA13716 433 m.pl foram. 16170 110 19016 18807-19224 Adegbie et al. 2003 KIA13715 523 m.pl foram. 18440 150 21469 20960-21978 Adegbie et al. 2003 "G. r. p." and "m. pl. foram." denotes G. ruber pink and mixed planktonic foraminifers, respectively. For the conversion of the 14C datings to calendar age, CALIB version 5.01 (Stuiver and Reimer, 1993) and Marine04 Data Set (Hughen et al, 2004) was used. 2. Results of Mg/Ca and d18O analyses (G. ruber pink), calculated Mg/Ca-SST, local d18Osw, and SSS of GeoB4905-4 Column 1: Depth (cm) Column 2: Age (cal ka BP) Column 3: Mg/Ca (mmol/mol) Column 4: Mg/Ca Sea Surface Temperature (SST, °C) Column 5: d18O G. ruber pink (per mil PDB) Column 6: d18O sw (per mil SMOW) Column 7: Sea Surface Salinity (SSS, ppt) Depth Age Mg/Ca Mg/CaSST d18Orub d18Osw SSS 3 0.06 3.96 26.05 -2.36 -0.1 31.45 8 0.69 4.09 26.4 -2.46 -0.13 31.32 13 1.04 3.9 25.86 -2.22 -0.01 31.88 18 1.39 3.95 26.02 -2.6 -0.35 30.31 23 1.74 3.93 25.96 -2.56 -0.32 30.43 25 1.88 4.11 26.44 -2.34 0 31.9 27 2.02 4.16 26.59 -2.59 -0.23 30.88 28 2.09 3.99 26.13 -3.09 -0.82 28.17 30 2.23 -2.68 32 2.37 3.85 25.72 33 2.44 3.63 25.09 -2.64 -0.57 29.29 35 2.59 -2.76 38 2.8 3.69 25.26 -2.45 -0.34 30.34 40 2.93 -2.5 42 3.07 -2.4 43 3.13 3.58 24.92 -2.79 -0.78 28.34 48 3.47 3.84 25.71 -2.71 -0.54 29.46 53 3.8 -2.33 58 4.14 3.84 25.7 -2.94 -0.78 28.37 63 4.47 4.11 26.47 -2.54 -0.22 30.91 68 4.91 -2.96 73 5.15 4.14 26.53 -2.94 -0.61 29.12 78 5.32 -2.56 83 5.5 -3.22 85 5.58 4.22 26.74 -2.75 -0.39 30.13 87 5.65 -3.34 88 5.68 -3.42 90 5.75 4.44 27.32 -2.71 -0.23 30.86 93 5.86 3.88 25.81 -3.27 -1.11 26.87 97 6.01 4.04 26.26 -3.12 -0.87 27.96 98 6.04 -2.82 100 6.11 4.26 26.85 -3.16 -0.78 28.35 102 6.18 4.33 27.03 -3.09 -0.68 28.83 103 6.22 3.84 25.7 -3.22 -1.09 26.95 108 6.4 3.89 25.84 -3.13 -0.97 27.49 110 6.47 3.99 26.14 -3.16 -0.94 27.62 112 6.54 4.16 26.58 -2.84 -0.54 113 6.58 4.45 27.34 -3.35 -0.89 27.87 118 6.76 4.55 27.6 -3.31 -0.8 28.25 120 6.83 4.38 27.15 123 6.94 -3.06 128 7.12 -3.11 133 7.3 4.29 26.94 -3.32 -0.97 27.52 138 7.47 4.1 26.43 -3.72 -1.48 25.18 140 7.55 3.99 26.12 143 7.65 3.94 25.98 143 7.65 -3.44 148 7.84 4.08 26.37 -2.99 -0.78 28.35 153 8.02 3.98 26.09 -3.21 -1.07 27.04 158 8.2 3.88 25.82 -3.4 -1.33 25.87 163 8.38 4.29 -2.98 168 8.57 -3.52 173 8.75 3.79 25.55 -2.89 -0.91 27.78 178 8.93 4.22 26.75 -3.02 -0.79 28.32 183 9.11 -2.97 188 9.3 4.45 27.34 -3.3 -0.99 27.42 193 9.48 3.93 25.96 -2.98 -0.98 27.47 198 9.66 3.89 25.83 -3.09 -1.13 26.77 203 9.84 -3.32 208 10.03 4.44 27.32 -3.16 -0.91 27.75 213 10.82 4.2 26.69 -3.31 -1.27 26.12 218 11 3.93 25.96 -3.17 -1.29 26.04 223 11.19 4.12 26.47 -3.28 -1.31 25.95 228 11.37 -2.8 232 11.51 3.91 25.9 233 11.55 -3.04 238 11.73 3.76 25.46 -3.14 -1.42 25.45 243 11.91 3.7 25.28 -2.68 -1.01 27.3 248 12.09 3.61 25.02 -2.54 -0.96 27.53 253 12.27 3.97 26.07 -2.73 -0.97 27.51 258 12.45 4.03 26.25 -2.11 -0.36 30.27 260 12.52 3.81 25.62 263 12.62 3.78 25.51 -1.54 0.04 32.07 265 12.68 3.67 25.18 267 12.75 3.73 25.38 268 12.78 3.94 25.99 -1.73 -0.09 31.47 273 12.94 4.02 26.22 -1.68 -0.01 31.86 278 13.1 3.62 25.05 -1.84 -0.44 29.92 283 13.27 3.75 25.44 -2.05 -0.58 29.28 288 13.43 3.77 25.49 -2.26 -0.79 28.3 293 13.59 3.71 25.31 -2.04 -0.63 29.05 298 13.76 -2.23 303 13.92 3.91 25.9 303 13.92 -2.11 308 14.15 4.06 26.32 -2.36 -0.78 28.36 313 14.38 3.83 25.68 -2.21 -0.78 28.36 318 14.61 4.31 26.98 -1.57 0.05 32.12 323 14.84 4.11 26.45 -1.81 -0.4 30.07 328 15.07 3.88 25.82 -1.6 -0.37 30.22 333 15.29 3.52 24.74 -1.17 -0.2 30.98 338 15.52 3.66 25.16 -0.93 0.1 32.35 342.5 15.73 3.43 24.44 -0.9 -0.04 31.71 348 15.93 3.73 25.37 -0.81 0.24 32.97 353 16.11 3.35 24.18 -1.16 -0.38 30.19 358 16.29 3.72 25.34 -0.69 0.33 33.39 363 16.47 3.63 25.08 -0.78 0.18 32.71 368 16.66 3.31 24.05 -0.62 0.12 32.43 373 16.84 3.41 24.37 -0.84 -0.04 31.71 378 17.02 3.44 24.49 -0.6 0.22 32.9 383 17.2 3.32 24.08 -0.44 0.29 33.2 388 17.38 3.44 24.47 -0.68 0.13 32.47 393 17.56 3.3 24.02 -0.42 0.29 33.21 398 17.75 -0.95 400 17.82 3.38 24.3 -0.45 0.31 33.3 402 17.89 3.22 23.73 -0.57 0.07 32.2 403 17.93 3.23 23.78 -1.11 -0.47 29.78 405 18 3.32 24.08 -0.51 0.2 32.81 407 18.07 -0.49 408 18.11 -0.51 410 18.18 3.34 24.15 -0.06 0.65 34.87 412 18.25 -0.89 413 18.29 3.35 24.2 -0.68 0.04 32.1 415 18.36 3.46 24.54 -0.27 0.52 417 18.44 3.51 24.71 -0.58 0.25 418 18.47 3.78 25.51 -1.36 -0.36 30.25 420 18.54 3.6 24.99 -0.51 0.37 33.59 422 18.62 -0.59 423 18.65 3.5 24.66 -0.83 -0.02 31.82 428 18.83 3.32 24.07 -0.96 -0.27 30.66 433 19.02 3.32 24.1 -1.11 -0.42 29.97 438 19.15 3.73 25.37 -1.01 -0.06 31.62 443 19.29 3.57 24.89 -0.9 -0.06 31.64 448 19.42 3.51 24.71 -0.63 0.17 32.66 453 19.56 3.17 23.56 458 19.7 3.32 24.08 -0.64 -0.01 31.86 463 19.83 3.14 23.45 -0.94 -0.46 29.83 468 19.97 3.18 23.61 -0.56 -0.06 31.64 473 20.11 3.24 23.8 -0.68 -0.16 31.18 478 20.24 3.07 23.21 -0.92 -0.54 29.43 480 20.3 3.31 24.06 -0.28 0.26 482 20.35 3.49 24.63 -0.21 0.46 483 20.38 3.54 24.81 -1.2 -0.49 29.66 488 20.52 3.26 23.9 -0.37 0.14 32.53 493 20.65 -0.93 498 20.79 3.7 25.28 -0.87 -0.06 31.61 508 21.06 -0.7 513 21.2 3.82 25.65 -0.87 0.01 31.96 518 21.33 -1 523 21.47 3.24 23.8 -0.86 -0.37 30.23 528 21.62 3.02 23.03 -0.74 -0.41 30.02 533 21.77 3.2 23.66 -0.8 -0.34 30.36