Equatorial Atlantic Sediment Composition and Radionuclide Data ----------------------------------------------------------------------- World Data Center for Paleoclimatology, Boulder and NOAA Paleoclimatology Program ----------------------------------------------------------------------- NOTE: PLEASE CITE ORIGINAL REFERENCE WHEN USING THIS DATA!!!!! NAME OF DATA SET: Equatorial Atlantic Sediment Composition and Radionuclide Data LAST UPDATE: 9/2008 (Original receipt by WDC Paleo) CONTRIBUTOR: Louisa I. Bradtmiller, LDEO/Columbia University IGBP PAGES/WDCA CONTRIBUTION SERIES NUMBER: 2008-093 WDC PALEO CONTRIBUTION SERIES CITATION: Bradtmiller, L.I., et al.. 2008. Equatorial Atlantic Sediment Composition and Radionuclide Data. IGBP PAGES/World Data Center for Paleoclimatology Data Contribution Series # 2008-093. NOAA/NCDC Paleoclimatology Program, Boulder CO, USA. ORIGINAL REFERENCE: Bradtmiller, L.I., R.F. Anderson, M.Q. Fleisher, and L.H. Burckle. 2007. Opal burial in the equatorial Atlantic Ocean over the last 30 ka: Implications for glacial-interglacial changes in the ocean silicon cycle. Paleoceanography, Vol. 22, PA4216, doi:10.1029/2007PA001443. ABSTRACT: The Silicic Acid Leakage Hypothesis (SALH) suggests that, during glacial periods, excess silicic acid was transported from the Southern Ocean to lower latitudes, which favored diatom production over coccolithophorid production and caused a drawdown of atmospheric CO2. Downcore records of 230Th-normalized opal fluxes and 231Pa/230Th ratios from seven equatorial Atlantic cores were used to reconstruct diatom productivity over the past 30 ka (where a is years) and to test the SALH. Downcore records of 231Pa/230Th ratios and opal fluxes are highly correlated, suggesting that they constitute a production-based record of opal flux. Opal flux records support the SALH in that glacial opal burial exceeded Holocene burial by 1.8 Gt opal/ka in the area 0°–40°W and 5°N–5°S. Earlier results from the eastern equatorial Pacific Ocean showed the opposite trend, with greater Holocene than glacial opal burial, but approximately the same magnitude of difference between glacial and interglacial opal burial. We suggest four (nonexclusive) scenarios to explain the data from both basins: (1) Increased upwelling in the equatorial Atlantic and El Nino–like conditions suppressing upwelling in the eastern equatorial Pacific altered the overall nutrient supply to both basins; (2) Si leaked from the Southern Ocean because of Fe fertilization, but was prevented from upwelling in the equatorial Pacific because of El Nino–like conditions during the LGM; (3) Si leaked from the Southern Ocean because diatom productivity was limited by increased sea ice extent and was again prevented from upwelling in the equatorial Pacific; or (4) changes in ocean circulation related to the decreased input of Agulhas water to the glacial South Atlantic provided excess dissolved Si to the equatorial Atlantic Ocean. A deglacial opal pulse is seen in both the Atlantic and Pacific Oceans. All four scenarios and the presence of the common deglacial opal pulse suggest a common driver in the Southern Ocean. GEOGRAPHIC REGION: Equatorial Atlantic PERIOD OF RECORD: Last Glacial Maximum/Holocene, ~25KYrBP - present FUNDING SOURCES: US National Science Foundation grant OCE03-26969 (to R.F.A.). L.I.B was supported by a Comer Abrupt Change Climate Fellowship. DESCRIPTION: Equatorial Atlantic sediment composition and radionuclide data. Core locations: Core Latitude Longitude Water Depth RC16-66 0.75°N 36.617°W 4424m. RC24-01 0.55°N 13.65°W 3837m. RC24-07 1.333°S 11.917°W 3899m. RC24-12 3.01°S 11.417°W 3486m. V22-182 0.53°S 17.27°W 3614m. V30-40 0.2°S 23.15°W 3706m. RC13-189 1.87°N 30°W 3233m. See Bradtmiller et al. 2007 for a description of age models and references. EXPLANATION OF DERIVED PARAMETERS: xs230Th and xs231Pa: xs230Th and xs231Pa refer to the measured value as corrected for ingrowth of 230Th (or 231Pa) from sedimentary and detrital uranium. These values are calculated using measured concentrations of 230Th (and 231Pa), 232Th and 238U, and assuming that all 232Th is detrital in nature. It also assumes a detrital U/Th ratio, which varies by region. 231Pa/230Thxs,0: The initial xs231Pa/xs230Th ratio refers to the ratio of xs230Th and xs231Pa after both have been decay corrected using their respective half-lives. 230Th normalized mass flux: For a discussion of this proxy and the relevant corrections and parameters, please see: Francois, R., M. Frank, M.M.R. van der Loeff, and M.P. Bacon (2004), Th-230 normalization: An essential tool for interpreting sedimentary fluxes during the late Quaternary, Paleoceanography, 19(1), 10.1029/2003PA00939. DATA: 1. Core RC24-01 Column 1: Depth (cm) Column 2: % CaCO3 Column 3: % Opal Column 4: 232Th (dpm/g) Column 5: 232Th error Column 6: 230Th (dpm/g) Column 7: 230Th error Column 8: 238U (dpm/g) Column 9: 238U error Column 10: 234U (dpm/g) Column 11: 234U error Column 12: 231Pa (dpm/g) Column 13: 231Pa error Column 14: Assigned age (ka) Column 15: xs230Th (dpm/g) Column 16: xs231Pa (dpm/g) Column 17: 231Pa/230Thxs,0 Column 18: 230Th-normalized mass flux (g/cm^2/ka) Depth %CaCO3 %Opal 232Th ± 230Th ± 238U ± 234U ± 231Pa ± Age xs230Th xs231Pa 231Pa/230Th Flux 5 81.16 0.35 0.3395 0.0068 7.2655 0.0022 0.2104 0.0042 0.2249 0.0042 0.2900 0.0052 4.4 7.0291 0.2792 0.0419 1.3785 9 82.92 0.63 0.3278 0.0059 7.3990 0.0024 0.1866 0.0072 0.2057 0.0072 0.2950 0.0061 6.7 7.1725 0.2847 0.0431 1.3223 14 82.21 2.69 0.3564 0.0051 8.2260 0.0025 0.1864 0.0051 0.2099 0.0051 0.3146 0.0083 8.3 7.9818 0.3036 0.0421 1.1711 21 81.51 1.59 0.4293 0.0048 7.4439 0.0025 0.2332 0.0046 0.2533 0.0046 0.2925 0.0024 10.1 7.1502 0.2793 0.0441 1.2861 27 75.72 4.53 0.6104 0.0081 6.7456 0.0047 0.4002 0.0119 0.4406 0.0119 0.3008 0.0069 11.6 6.3214 0.2815 0.0512 1.4345 33 72.32 4.83 0.6887 0.0094 6.3622 0.0093 0.6945 0.0194 0.7702 0.0194 0.3014 0.0105 13.1 5.8526 0.2768 0.0554 1.5279 39 58.07 8.63 0.9681 0.0111 6.9763 0.0250 2.1367 0.0474 2.3926 0.0474 0.3719 0.0097 14.6 6.0892 0.3227 0.0633 1.4481 45 61.12 8.58 1.0044 0.0117 7.6030 0.0463 4.0330 0.0512 4.5839 0.0512 0.4059 0.0057 15.9 6.3848 0.3296 0.0626 1.3655 51 69.38 6.36 0.6819 0.0099 7.6242 0.0651 6.2453 0.1057 7.1206 0.1057 0.3946 0.0085 17.0 6.1946 0.2918 0.0579 1.3925 71 68.06 7.52 0.6956 0.0114 7.5497 0.0696 4.3163 0.0522 4.8696 0.0522 0.3780 0.0135 20.9 6.3007 0.2922 0.0597 1.3211 90 62.39 8.72 0.9627 0.0130 7.8695 0.0378 3.4262 0.0465 3.8597 0.0465 0.3908 0.0037 24.6 6.5625 0.3081 0.0632 1.2261 105 65.7 7.6 0.8354 0.0122 7.7661 0.0431 3.3172 0.0657 3.7519 0.0657 0.3719 0.0112 27.5 6.4879 0.2893 0.0622 1.2075 150 66.04 6.95 0.8022 0.0087 6.4722 0.0263 2.2107 0.0310 2.4386 0.0310 0.3040 0.0038 36.2 5.4898 0.2373 0.0670 1.3171 201 73.67 6.14 0.6060 0.0116 5.9431 0.0336 2.5649 0.0382 2.8972 0.0382 0.2753 0.0082 45.9 4.6841 0.1943 0.0723 1.4115 250 81.75 3.68 0.6943 0.0102 6.9037 0.0154 1.4317 0.0333 1.5916 0.0333 0.1586 0.0046 54.5 5.9961 0.1064 0.0343 1.0185 286 64.17 8.65 0.9766 0.0114 5.6689 0.0162 1.4813 0.0280 1.5876 0.0280 0.1833 0.0028 60.8 4.7005 0.1252 0.0556 1.2265 2. Core RC24-07 Column 1: Depth (cm) Column 2: % CaCO3 Column 3: % Opal Column 4: 232Th (dpm/g) Column 5: 232Th error Column 6: 230Th (dpm/g) Column 7: 230Th error Column 8: 238U (dpm/g) Column 9: 238U error Column 10: 234U (dpm/g) Column 11: 234U error Column 12: 231Pa (dpm/g) Column 13: 231Pa error Column 14: Assigned age (ka) Column 15: xs230Th (dpm/g) Column 16: xs231Pa (dpm/g) Column 17: 231Pa/230Thxs,0 Column 18: 230Th-normalized mass flux (g/cm^2/ka) Depth %CaCO3 %Opal 232Th ± 230Th ± 238U ± 234U ± 231Pa ± Age xs230Th xs231Pa 231Pa/230Th Flux 2 81.89 3.55 0.2741 0.0062 7.0729 0.0022 0.1875 0.0074 0.2096 0.0074 0.3116 0.0031 1.9 6.8811 0.3028 0.0450 1.4645 15 84.23 3.61 0.2600 0.0035 7.8130 0.0019 0.1498 0.0067 0.1634 0.0067 0.3219 0.0080 4.4 7.6325 0.3137 0.0434 1.2898 29 82.82 4.02 0.3273 0.0055 7.9531 0.0024 0.2197 0.0057 0.2468 0.0057 0.3308 0.0080 7.2 7.7247 0.3203 0.0452 1.2427 43 67.14 7.42 0.6487 0.0149 7.0577 0.0145 1.3642 0.0173 1.5154 0.0173 0.3897 0.0066 9.7 6.5147 0.3610 0.0623 1.4390 49 74.43 6.56 0.5582 0.0092 6.8474 0.0362 3.3796 0.0507 3.8508 0.0507 0.3515 0.0075 10.8 6.1336 0.3051 0.0567 1.5130 56 71.06 7.18 0.5977 0.0080 7.3746 0.0428 4.1004 0.0501 4.6432 0.0501 0.3896 0.0072 12.1 6.5137 0.3318 0.0590 1.4080 61 70.48 7.44 0.6370 0.0073 7.0728 0.0349 3.2748 0.0394 3.7082 0.0394 0.3821 0.0091 13.0 6.2628 0.3300 0.0617 1.4521 66 60.01 11.37 0.8867 0.0099 8.6547 0.0396 3.4627 0.0519 3.9125 0.0519 0.5206 0.0108 13.9 7.6442 0.4585 0.0710 1.1797 77 58.66 12.2 0.9244 0.0155 9.1625 0.0469 4.3316 0.0530 4.8709 0.0530 0.5337 0.0117 15.8 7.9479 0.4554 0.0694 1.1154 112 69.08 6.9 0.4673 0.0076 7.2502 0.0585 5.3675 0.0619 6.0301 0.0619 0.4037 0.0071 21.0 5.9169 0.3051 0.0665 1.4285 144 58.01 12.12 0.8562 0.0130 9.9901 0.0541 5.1819 0.0636 5.8252 0.0636 0.5492 0.0107 25.6 8.2971 0.4329 0.0712 0.9760 179 68.01 8.3 0.6300 0.0099 8.8293 0.0440 4.2004 0.0486 4.7046 0.0486 0.4320 0.0067 30.7 7.3376 0.3286 0.0650 1.0531 229 76.2 6.4 0.5115 0.0097 6.3132 0.0321 2.9819 0.0431 3.3330 0.0431 0.2447 0.0067 38.0 5.0778 0.1612 0.0503 1.4232 279 74.55 7.18 0.4925 0.0066 6.4111 0.0331 2.8311 0.0396 3.1555 0.0396 0.2865 0.0068 45.2 5.1076 0.1999 0.0677 1.3232 329 77.05 5.63 0.4583 0.0070 6.9984 0.0369 3.2171 0.0472 3.6106 0.0472 0.2915 0.0048 52.5 5.4227 0.1870 0.0651 1.1656 369 60.38 10.89 0.8387 0.0122 7.1567 0.0333 2.9139 0.0372 3.1518 0.0372 0.2636 0.0054 60.2 5.4524 0.1592 0.0605 1.0801 3. Core RC24-12 Column 1: Depth (cm) Column 2: % CaCO3 Column 3: % Opal Column 4: 232Th (dpm/g) Column 5: 232Th error Column 6: 230Th (dpm/g) Column 7: 230Th error Column 8: 238U (dpm/g) Column 9: 238U error Column 10: 234U (dpm/g) Column 11: 234U error Column 12: 231Pa (dpm/g) Column 13: 231Pa error Column 14: Assigned age (ka) Column 15: xs230Th (dpm/g) Column 16: xs231Pa (dpm/g) Column 17: 231Pa/230Thxs,0 Column 18: 230Th-normalized mass flux (g/cm^2/ka) Depth %CaCO3 %Opal 232Th ± 230Th ± 238U ± 234U ± 231Pa ± Age xs230Th xs231Pa 231Pa/230Th Flux 2 85.4 2.31 0.1716 0.0023 5.3904 0.0023 0.1834 0.0073 0.2026 0.0073 0.2241 0.0042 1.8 5.2691 0.2184 0.0424 1.7115 18 85.22 2.54 0.1855 0.0019 6.1222 0.0019 0.1382 0.0049 0.1521 0.0049 0.2749 0.0044 4.1 5.9919 0.2689 0.0472 1.4733 36 88.29 2.29 0.1701 0.0021 5.9334 0.0027 0.1283 0.0057 0.1460 0.0057 0.2476 0.0061 6.8 5.8137 0.2421 0.0452 1.4818 53 88.96 2.23 0.1833 0.0025 5.1420 0.0016 0.1301 0.0033 0.1473 0.0033 0.1973 0.0064 9.9 5.0135 0.1914 0.0430 1.6695 59 87.22 2.96 0.2478 0.0044 4.9720 0.0016 0.1610 0.0079 0.1811 0.0079 0.2085 0.0040 11.0 4.7999 0.2007 0.0478 1.7261 64 87.75 2.87 0.2462 0.0211 4.6132 0.0018 0.1430 0.0055 0.1585 0.0055 0.1877 0.0014 11.9 4.4444 0.1800 0.0468 1.8485 71 85.35 3.34 0.3168 0.0048 4.8110 0.0018 0.1703 0.0047 0.1877 0.0047 0.2120 0.0018 13.2 4.5959 0.2024 0.0517 1.7664 78 79.92 5.11 0.4701 0.0061 6.4662 0.0025 0.2090 0.0098 0.2296 0.0098 0.2952 0.0043 15.0 6.1547 0.2816 0.0548 1.2978 86 81.83 3.5 0.3846 0.0071 6.0025 0.0027 0.2471 0.0067 0.2928 0.0067 0.2590 0.0048 17.5 5.7371 0.2470 0.0532 1.3597 94 80.72 3.75 0.4442 0.0059 7.6375 0.0071 0.6145 0.0137 0.7939 0.0137 0.3450 0.0052 19.5 7.2699 0.3260 0.0568 1.0540 102 70.23 4.37 0.5426 0.0066 8.7289 0.0100 0.9439 0.0243 1.2574 0.0243 0.4062 0.0040 21.6 8.2336 0.3792 0.0598 0.9128 112 80.14 3.8 0.4843 0.0070 8.8742 0.0126 1.1528 0.0201 1.5637 0.0201 0.4253 0.0049 24.5 8.3487 0.3945 0.0635 0.8765 135 85.68 2.71 0.3198 0.0036 7.0121 0.3864 17.2178 0.2790 19.8687 0.2790 0.3631 0.0039 32.3 1.8715 -0.0366 -0.0289 3.6372 155 83.31 3.5 0.3597 0.0041 6.6384 0.1549 13.8121 0.1718 16.6427 0.1718 0.2970 0.0022 42.2 1.4448 -0.0846 -0.0976 4.3022 175 81.09 3.41 0.4324 0.0048 8.4274 0.5791 7.9745 0.1077 10.2116 0.1077 0.3978 0.0029 54.4 4.7073 0.1415 0.0581 1.1793 199 84.92 3.42 0.3601 0.0056 6.9092 0.0755 5.7849 0.0929 6.4261 0.0929 0.2946 0.0030 60.1 4.0035 0.0992 0.0513 1.3163 NOTE: Apparent negative xs231Pa values at 135 and 155cm are the result of large authigenic U concentrations at these depths. Negative xs231Pa values are undefined. 4. Core RC16-66 Column 1: Depth (cm) Column 2: % CaCO3 Column 3: % Opal Column 4: 232Th (dpm/g) Column 5: 232Th error Column 6: 230Th (dpm/g) Column 7: 230Th error Column 8: 238U (dpm/g) Column 9: 238U error Column 10: 234U (dpm/g) Column 11: 234U error Column 12: 231Pa (dpm/g) Column 13: 231Pa error Column 14: Assigned age (ka) Column 15: xs230Th (dpm/g) Column 16: xs231Pa (dpm/g) Column 17: 231Pa/230Thxs,0 Column 18: 230Th-normalized mass flux (g/cm^2/ka) Depth %CaCO3 %Opal 232Th ± 230Th ± 238U ± 234U ± 231Pa ± Age xs230Th xs231Pa 231Pa/230Th Flux 5 56.58 3.12 1.4164 0.0174 12.2332 0.0067 0.6019 0.0130 0.6043 0.0130 0.4930 0.0045 2.3 11.2512 0.4483 0.0410 1.0120 12 58.61 3.3 1.3668 0.0153 11.7319 0.0065 0.5810 0.0099 0.5790 0.0099 0.4866 0.0048 5.4 10.7961 0.4445 0.0440 1.0251 16 61.37 2.99 1.3042 0.0207 11.1032 0.0062 0.5303 0.0123 0.5345 0.0123 0.4468 0.0035 6.9 10.2172 0.4072 0.0433 1.0686 23 61.31 3.03 1.3259 0.0342 10.2134 0.0073 0.5489 0.0199 0.5382 0.0199 0.4062 0.0032 9.5 9.3213 0.3666 0.0441 1.1438 34 58.68 2.87 1.5454 0.0249 7.9593 0.0074 0.6027 0.0208 0.6039 0.0208 0.3612 0.0029 12.5 6.9367 0.3166 0.0531 1.4953 44 45.93 3.33 1.9197 0.0368 7.2051 0.0101 0.7576 0.0137 0.7628 0.0137 0.3817 0.0065 13.6 5.9400 0.3267 0.0649 1.7277 56 26.45 4.19 2.9595 0.0540 8.2772 0.0128 1.1100 0.0131 1.1043 0.0131 0.5143 0.0070 15.0 6.3469 0.4311 0.0815 1.5963 66 37.07 2.74 2.2501 0.0399 7.1692 0.0090 0.8537 0.0110 0.8414 0.0110 0.3664 0.0060 16.2 5.7077 0.3036 0.0647 1.7562 80 42.41 3.16 2.2813 0.0425 7.0930 0.0087 0.8018 0.0153 0.7784 0.0153 0.3458 0.0061 17.8 5.6328 0.2839 0.0625 1.7531 100 25.48 4.24 2.9222 0.0642 7.2918 0.0122 1.0154 0.0217 1.0017 0.0217 0.3515 0.0079 20.0 5.4429 0.2738 0.0641 1.7785 121 34.26 4.03 2.5818 0.0338 6.2960 0.0115 0.9374 0.0122 0.9088 0.0122 0.2918 0.0058 22.2 4.6718 0.2238 0.0627 2.0291 151 45.98 3.25 1.9151 0.0331 5.5109 0.0092 0.8428 0.0224 0.8375 0.0224 0.2445 0.0092 25.9 4.2901 0.1925 0.0614 2.1370 5. Core RC13-189 Column 1: Depth (cm) Column 2: % CaCO3 Column 3: % Opal Column 4: 232Th (dpm/g) Column 5: 232Th error Column 6: 230Th (dpm/g) Column 7: 230Th error Column 8: 238U (dpm/g) Column 9: 238U error Column 10: 234U (dpm/g) Column 11: 234U error Column 12: 231Pa (dpm/g) Column 13: 231Pa error Column 14: Assigned age (ka) Column 15: xs230Th (dpm/g) Column 16: xs231Pa (dpm/g) Column 17: 231Pa/230Thxs,0 Column 18: 230Th-normalized mass flux (g/cm^2/ka) Depth %CaCO3 %Opal 232Th ± 230Th ± 238U ± 234U ± 231Pa ± Age xs230Th xs231Pa 231Pa/230Th Flux 3 81.75 0.91 0.4567 0.0062 5.6812 0.0025 0.2358 0.0107 0.2445 0.0107 0.3065 0.0034 2.8 5.3640 0.2920 0.0563 1.5445 11 84.96 0.5 0.4499 0.0059 7.2774 0.0026 0.2073 0.0039 0.2176 0.0039 0.3751 0.0043 5.4 6.9685 0.3612 0.0554 1.1604 18 79.16 1.11 0.6744 0.0083 6.7364 0.0031 0.2690 0.0105 0.2856 0.0105 0.3120 0.0037 7.7 6.2803 0.2917 0.0510 1.2606 25 69.24 1.8 1.0525 0.0151 6.3523 0.0051 0.4171 0.0124 0.4195 0.0124 0.3250 0.0064 10.1 5.6480 0.2940 0.0588 1.3712 28 68.42 1.77 1.1500 0.0229 5.9879 0.0053 0.4554 0.0135 0.4488 0.0135 0.3198 0.0069 11.2 5.2220 0.2862 0.0628 1.4685 33 66.36 2.34 1.1754 0.0129 5.3749 0.0052 0.4572 0.0138 0.4595 0.0138 0.3130 0.0037 12.9 4.5988 0.2792 0.0710 1.6414 36 59.51 2.72 1.3131 0.0173 5.7842 0.0060 0.5104 0.0101 0.4942 0.0101 0.3412 0.0034 13.8 4.9204 0.3037 0.0729 1.5223 40 57.72 3.14 1.4153 0.0268 5.9604 0.0061 0.5669 0.0137 0.5530 0.0137 0.3597 0.0056 14.7 5.0308 0.3194 0.0759 1.4758 60 56.46 4.15 1.3186 0.0172 5.2787 0.0056 0.5117 0.0117 0.5129 0.0117 0.2816 0.0032 18.7 4.4296 0.2454 0.0694 1.6162 70 61.61 4.64 1.2646 0.0259 5.0979 0.0067 0.5962 0.0157 0.6347 0.0157 0.2562 0.0033 20.8 4.2699 0.2202 0.0663 1.6442 80 58.53 3.81 1.6675 0.0200 5.5053 0.0318 2.7058 0.0322 2.9653 0.0322 0.2904 0.0020 22.9 4.0052 0.2094 0.0690 1.7186 90 71.51 2.19 1.1807 0.0139 4.7056 0.0118 1.0558 0.0213 1.1248 0.0213 0.2200 0.0051 25.4 3.8248 0.1775 0.0631 1.7591 6. Core V30-40 Column 1: Depth (cm) Column 2: % CaCO3 Column 3: % Opal Column 4: 232Th (dpm/g) Column 5: 232Th error Column 6: 230Th (dpm/g) Column 7: 230Th error Column 8: 238U (dpm/g) Column 9: 238U error Column 10: 234U (dpm/g) Column 11: 234U error Column 12: 231Pa (dpm/g) Column 13: 231Pa error Column 14: Assigned age (ka) Column 15: xs230Th (dpm/g) Column 16: xs231Pa (dpm/g) Column 17: 231Pa/230Thxs,0 Column 18: 230Th-normalized mass flux (g/cm^2/ka) Depth %CaCO3 %Opal 232Th ± 230Th ± 238U ± 234U ± 231Pa ± Age xs230Th xs231Pa 231Pa/230Th Flux 5 78.34 1.75 0.2494 0.0034 5.0453 0.0018 0.1752 0.0117 0.1877 0.0117 0.2181 0.0051 1.5 4.8707 0.2100 0.0439 1.9733 10 89.96 1.63 0.2847 0.0060 6.5071 0.0026 0.1693 0.0047 0.1810 0.0047 0.2697 0.0054 5.1 6.3094 0.2607 0.0439 1.4742 20 88.9 1.62 0.3521 0.0051 7.1526 0.0025 0.1747 0.0131 0.1880 0.0131 0.2844 0.0033 7.5 6.9115 0.2735 0.0433 1.3164 31 81.82 2.05 0.5530 0.0074 5.0252 0.0024 0.2345 0.0140 0.2443 0.0140 0.2411 0.0042 11.0 4.6548 0.2248 0.0551 1.8926 35 79.31 2.52 0.6590 0.0107 4.7455 0.0028 0.2687 0.0117 0.2704 0.0117 0.2547 0.0089 12.3 4.3076 0.2355 0.0634 2.0209 40 76.61 3.34 0.7669 0.0135 4.7886 0.0036 0.3100 0.0189 0.3205 0.0189 0.2614 0.0034 12.9 4.2808 0.2392 0.0653 2.0211 46 66.26 4.13 1.0540 0.0156 5.8212 0.0041 0.3821 0.0107 0.3912 0.0107 0.3165 0.0069 14.0 5.1323 0.2868 0.0662 1.6694 52 75.16 3.09 0.6978 0.0088 4.6815 0.0026 0.2528 0.0046 0.2505 0.0046 0.2285 0.0050 15.8 4.2294 0.2092 0.0599 1.9919 62 84.5 1.95 0.4403 0.0068 3.9634 0.0018 0.1537 0.0044 0.1580 0.0044 0.1719 0.0040 18.6 3.6828 0.1600 0.0544 2.2304 72 76.21 2.63 0.5437 0.0069 3.8559 0.0020 0.1959 0.0071 0.2017 0.0071 0.1712 0.0042 20.7 3.5118 0.1567 0.0574 2.2925 82 80.32 1.83 0.4941 0.0091 3.8669 0.0018 0.1581 0.0065 0.1567 0.0065 0.1209 0.0032 22.5 3.5610 0.1083 0.0399 2.2245 94 86.4 1.2 0.4796 0.0051 3.4975 0.0066 0.5854 0.0127 0.6789 0.0127 0.1048 0.0020 25.0 3.1033 0.0847 0.0369 2.4938 7. Core V22-182 Column 1: Depth (cm) Column 2: % CaCO3 Column 3: % Opal Column 4: 232Th (dpm/g) Column 5: 232Th error Column 6: 230Th (dpm/g) Column 7: 230Th error Column 8: 238U (dpm/g) Column 9: 238U error Column 10: 234U (dpm/g) Column 11: 234U error Column 12: 231Pa (dpm/g) Column 13: 231Pa error Column 14: Assigned age (ka) Column 15: xs230Th (dpm/g) Column 16: xs231Pa (dpm/g) Column 17: 231Pa/230Thxs,0 Column 18: 230Th-normalized mass flux (g/cm^2/ka) Depth %CaCO3 %Opal 232Th ± 230Th ± 238U ± 234U ± 231Pa ± Age xs230Th xs231Pa 231Pa/230Th Flux 3 87.86 2.18 0.289 0.004 7.704 0.001 0.109 0.008 0.109 0.008 0.174 0.003 0.9 7.503 0.165 0.022 1.257 13 85.38 2.06 0.275 0.003 7.183 0.001 0.128 0.008 0.131 0.008 0.272 0.004 3.8 6.993 0.263 0.039 1.312 24 86.05 2.37 0.318 0.005 7.667 0.001 0.132 0.005 0.145 0.005 0.285 0.005 7.4 7.452 0.275 0.040 1.191 33 82.26 2.83 0.461 0.006 5.552 0.002 0.181 0.007 0.191 0.007 0.240 0.005 9.2 5.243 0.226 0.048 1.666 38 81.23 2.71 0.496 0.005 5.308 0.002 0.199 0.005 0.205 0.005 0.239 0.006 11.0 4.977 0.225 0.052 1.725 42 73.31 3.24 0.548 0.006 5.294 0.002 0.206 0.006 0.207 0.006 0.255 0.005 12.2 4.932 0.239 0.056 1.723 46 76.56 4.08 0.640 0.007 5.937 0.003 0.227 0.008 0.230 0.008 0.277 0.005 13.4 5.519 0.258 0.055 1.523 50 65.76 6.06 0.852 0.011 6.282 0.003 0.307 0.005 0.311 0.005 0.334 0.006 14.7 5.728 0.310 0.065 1.449 61 83.18 2.92 0.440 0.005 4.277 0.005 0.450 0.016 0.491 0.016 0.198 0.005 18.6 3.944 0.182 0.058 2.030 70 83.64 3.38 0.467 0.006 4.284 0.005 0.500 0.007 0.547 0.007 0.191 0.004 21.1 3.922 0.173 0.057 1.994 81 84.99 2.49 0.427 0.008 4.543 0.007 0.616 0.012 0.726 0.012 0.188 0.005 24.2 4.173 0.168 0.054 1.823 90 86.28 2.17 0.384 0.004 4.282 0.014 1.299 0.022 1.514 0.022 0.185 0.004 26.7 3.758 0.152 0.056 1.978