# North Atlantic Ocean Western Boundary Current Globorotalia truncatulinoides Coiling Ratio Data for the past 700 kyr #----------------------------------------------------------------------- # World Data Service for Paleoclimatology, Boulder # and # NOAA Paleoclimatology Program #----------------------------------------------------------------------- # Template Version 3.0 # Encoding: UTF-8 # NOTE: Please cite original publication, online resource and date accessed when using this data. # If there is no publication information, please cite Investigator, title, online resource and date accessed. # # Description/Documentation lines begin with # # Data lines have no # # # Online_Resource: https://www.ncdc.noaa.gov/paleo/study/30952 # Description: NOAA Landing Page # Online_Resource: https://www.ncei.noaa.gov/pub/data/paleo/contributions_by_author/billups2020-pp/billups2020-pp-1058.txt # Description: NOAA location of the template # # # Data_Type: Paleoceanography # # Dataset_DOI: # # Parameter_Keywords: population abundance #--------------------------------------- # Contribution_Date # Date: 2020-08-24 #--------------------------------------- # File_Last_Modified_Date # Date: 2020-08-24 #--------------------------------------- # Title # Study_Name: North Atlantic Ocean Western Boundary Current Globorotalia truncatulinoides Coiling Ratio Data for the past 700 kyr #--------------------------------------- # Investigators # Investigators: Billups, Katharina; Vizcaíno, Maoli; Chiarelli, Josephine; Kaiser, Emily #--------------------------------------- # Description_Notes_and_Keywords # Description: # Provided Keywords: Pleistocene, Globorotalia truncatulinoides, subtropical gyre, water column structure, North Atlantic Ocean #--------------------------------------- # Publication # Authors: Billups, Katharina, Maoli Vizcaíno, Josephine Chiarelli, and Emily Kaiser # Published_Date_or_Year: 2020 # Published_Title: Reconstructing western boundary current stability in the North Atlantic Ocean for the past 700 kyr from Globorotalia truncatulinoides coiling ratios # Journal_Name: Paleoceanography and Paleoclimatology # Volume: in review # Edition: # Issue: # Pages: # Report_Number: # DOI: # Online_Resource: # Full_Citation: # Abstract: Down-core changes in the coiling direction of Globorotalia truncatulinoides in the northwestern subtropical Atlantic (KNR140-37PC and Ocean Drilling Program Sites 1063, 1059, 1056, 1058) provide a tracer for the hydrographic conditions in the western boundary current over the past 700 kyr (Marine Isotope Stage, MIS, 1-17). A consistent association between percent G. truncatulinoides (sinistral) abundances, total test counts, and bulk sediment CaCO3 content is established by MIS 11 suggesting a response to ocean-atmosphere interactions during the mid Brunhes event. Commencing with MIS 11, interglacial maxima are associated with high total test counts and either distinct sinistral test minima (MIS 9e, 11c) or maxima (MIS 1, 5e, 7a). High sinistral test abundances with relatively high test counts is similar to the late Holocene relationship at the study sites. Low sinistral test abundances despite high test counts means that coiling ratios are dominated by dextral forms. We interpret this pattern to indicate more intense flow in the subtropical gyre either via the western boundary current drawing toward the gyre center, or a more northern influence of the North Equatorial and Antilles Currents. This suggests that the western boundary current may have been more intense during MIS 11c and MIS 9e then during MIS 7a, MIS 5e, and MIS 1 consistent with climate warm anomalies in northern Europe at these times. Regardless of the mechanism, the observation that minima and maxima in sinistral test abundances are prolonged at these times indicates that the western gyre boundary remained stable during relative warm intervals. #--------------------------------------- # Funding_Agency # Funding_Agency_Name: # Grant: #--------------------------------------- # Site_Information # Site_Name: ODP 1058 # Location: North Atlantic Ocean # Northernmost_Latitude: 31.69 # Southernmost_Latitude: 31.69 # Easternmost_Longitude: -75.43 # Westernmost_Longitude: -75.43 # Elevation: -2996 #--------------------------------------- # Data_Collection # Collection_Name: ODP1058 G.trunc Billups2020 # First_Year: 695900 # Last_Year: 412000 # Time_Unit: cal yr BP # Core_Length: 35.91 # Notes: Ages are based on oxygen isotope stratigraphy from Weirauch et al (2008): Weirauch, D., Billups, K. and P. Martin, Evolution of Millennial-Scale Climate Variability During the Mid Pleistocene, Paleoceanography, 23, PA3216, doi:10.1029/2007PA001584. #--------------------------------------- # Chronology_Information # Chronology: # Ages are based on oxygen isotope stratigraphy from Weirauch et al (2008): Weirauch, D., Billups, K. and P. Martin, Evolution of Millennial-Scale Climate Variability During the Mid Pleistocene, Paleoceanography, 23, PA3216, doi:10.1029/2007PA001584. #--------------------------------------- # Variables # Data variables follow that are preceded by "##" in columns one and two. # Variables list, one per line, shortname-tab-longname components (9 components: what, material, error, units, seasonality, archive, detail, method, C or N for Character or Numeric data) ## Depth depth,,,meter,,paleoceanography,,,N,meters composite depth ## Age age,,,calendar kiloyear before present,,paleoceanography,,,N,interval age ## sinistral Globorotalia truncatulinoides,,,count,,paleoceanography,,microscopy,N,total number of Globorotalia truncatulinoides (sinistral) tests; visual counts using a microscope ## dextral Globorotalia truncatulinoides,,,count,,paleoceanography,,microscopy,N,total number of Globorotalia truncatulinoides (dextral) tests; visual counts using a microscope ## total Globorotalia truncatulinoides,,,count,,paleoceanography,,,N,total number of Globorotalia truncatulinoides (sinistral plus dextral) tests ## %sinistral Globorotalia truncatulinoides,,,percent,,paleoceanography,,,N,percent sinistral test (number of sinistral tests/number of total tests*100 #------------------------ # Data: # Data lines follow (have no #) # Data line format - tab-delimited text, variable short name as header # Missing_Values: NA Depth Age sinistral dextral total %sinistral 56.30 412.0 10 184 194 5.15 56.39 412.4 19 159 178 10.67 56.49 412.8 39 164 203 19.21 56.60 413.2 17 204 221 7.69 56.69 413.5 8 219 227 3.52 56.79 413.8 4 158 162 2.47 56.90 414.2 2 69 71 2.82 56.99 414.5 5 117 122 4.10 57.20 415.2 1 9 10 10.00 57.30 415.6 0 3 3 0.00 57.39 415.9 1 1 2 50.00 57.50 416.2 1 2 3 33.33 57.58 416.5 0 2 2 0.00 57.69 416.9 2 0 2 100.00 57.80 417.2 0 0 0 0.00 57.89 417.5 2 3 5 40.00 57.99 417.9 0 0 0 0.00 58.10 418.2 1 4 5 20.00 58.18 418.5 0 7 7 0.00 58.29 418.9 1 14 15 6.67 58.40 419.3 1 11 12 8.33 58.48 419.6 28 26 54 51.85 58.59 420.0 33 5 38 86.84 58.695 420.4 27 0 27 100.00 58.78 420.7 12 2 14 85.71 58.89 421.1 17 2 19 89.47 59 421.6 8 0 8 100.00 59.08 421.9 3 1 4 75.00 59.19 422.3 10 7 17 58.82 59.3 422.6 1 8 9 11.11 59.38 422.9 0 17 17 0.00 59.49 423.3 2 25 27 7.41 59.6 423.8 8 56 64 12.50 59.68 424.1 2 100 102 1.96 59.79 424.5 0 2 2 0.00 59.895 425.0 1 7 8 12.50 59.98 425.6 2 3 5 40.00 60.09 426.4 1 9 10 10.00 60.205 427.3 2 11 13 15.38 60.285 427.8 4 1 5 80.00 60.39 428.5 4 1 5 80.00 60.495 429.2 14 1 15 93.33 60.58 429.7 54 10 64 84.38 60.69 430.5 44 5 49 89.80 60.8 431.3 19 15 34 55.88 60.89 432.0 37 82 119 31.09 60.99 432.7 35 89 124 28.23 61.07 433.3 13 223 236 5.51 61.185 434.3 4 257 261 1.53 61.29 435.1 1 65 66 1.52 61.4 436.0 10 162 172 5.81 61.485 436.7 7 85 92 7.61 61.59 437.6 50 48 98 51.02 61.7 438.5 6 2 8 75.00 61.785 439.2 11 8 19 57.89 61.89 440.0 5 11 16 31.25 62 440.9 1 1 2 50.00 62.04 441.3 0 2 2 0.00 62.09 441.7 0 16 16 0.00 62.14 442.2 0 4 4 0.00 62.19 442.7 0 6 6 0.00 62.24 443.2 0 11 11 0.00 62.29 443.7 0 6 6 0.00 62.35 444.3 0 3 3 0.00 62.43 444.9 0 1 1 0.00 62.54 445.6 0 6 6 0.00 62.65 446.4 2 98 100 2.00 62.74 447.0 2 14 16 12.50 62.84 447.8 2 112 114 1.75 62.95 448.8 1 47 48 2.08 63.035 449.5 6 61 67 8.96 63.14 450.4 2 72 74 2.70 63.25 451.4 2 28 30 6.67 63.335 452.1 0 22 22 0.00 63.44 453.0 0 9 9 0.00 63.545 453.9 0 54 54 0.00 63.635 454.6 1 65 66 1.52 63.74 455.5 1 53 54 1.85 63.845 456.4 1 22 23 4.35 63.945 457.2 1 22 23 4.35 64.035 458.0 0 53 53 0.00 64.14 458.8 1 44 45 2.22 64.21 459.4 1 76 77 1.30 64.34 460.5 3 86 89 3.37 64.45 461.2 0 19 19 0.00 64.535 461.8 4 68 72 5.56 64.64 462.5 19 40 59 32.20 64.75 463.3 5 137 142 3.52 64.835 463.9 6 258 264 2.27 64.94 464.6 4 235 239 1.67 65.05 465.3 4 220 224 1.79 65.135 465.9 6 279 285 2.11 65.24 466.6 4 254 258 1.55 65.345 467.3 2 247 249 0.80 65.435 467.9 7 312 319 2.19 65.54 468.6 2 165 167 1.20 65.645 469.5 5 173 178 2.81 65.74 470.3 3 150 153 1.96 65.84 471.1 3 97 100 3.00 65.92 471.8 2 118 120 1.67 65.95 472.0 4 141 145 2.76 66.03 473.0 3 128 131 2.29 66.04 473.1 6 107 113 5.31 66.14 474.3 6 168 174 3.45 66.25 475.7 6 167 173 3.47 66.34 476.8 9 199 208 4.33 66.39 477.5 5 91 96 5.21 66.44 478.3 7 236 243 2.88 66.495 479.1 8 251 259 3.09 66.545 479.8 12 192 204 5.88 66.575 480.3 28 192 220 12.73 66.63 481.1 23 102 125 18.40 66.69 482.0 23 102 125 18.40 66.74 482.7 12 12 24 50.00 66.795 483.2 19 55 74 25.68 66.85 483.7 13 39 52 25.00 66.88 484.0 17 5 22 77.27 66.94 484.6 19 2 21 90.48 66.99 485.0 31 54 85 36.47 67.04 485.5 16 23 39 41.03 67.09 485.9 26 5 31 83.87 67.14 486.4 23 6 29 79.31 67.19 486.8 22 9 31 70.97 67.24 487.3 17 4 21 80.95 67.29 487.8 12 3 15 80.00 67.34 488.2 7 6 13 53.85 67.39 488.7 9 4 13 69.23 67.44 489.1 20 5 25 80.00 67.49 489.6 20 13 33 60.61 67.54 490.0 10 14 24 41.67 67.59 490.5 14 9 23 60.87 67.64 491.0 4 5 9 44.44 67.69 491.4 22 5 27 81.48 67.74 491.9 22 5 27 81.48 67.79 492.3 14 2 16 87.50 67.84 492.8 16 12 28 57.14 67.89 493.2 5 4 9 55.56 67.94 493.7 12 4 16 75.00 67.99 494.1 16 3 19 84.21 68.04 494.6 4 6 10 40.00 68.09 495.1 7 26 33 21.21 68.14 495.5 15 51 66 22.73 68.19 496.0 7 8 15 46.67 68.24 496.4 8 9 17 47.06 68.28 496.8 15 3 18 83.33 68.33 497.3 6 18 24 25.00 68.39 497.8 3 16 19 15.79 68.44 498.3 15 34 49 30.61 68.49 498.7 21 40 61 34.43 68.54 499.2 3 5 8 37.50 68.59 499.6 6 23 29 20.69 68.64 500.1 12 23 35 34.29 68.69 500.5 21 21 42 50.00 68.74 501.0 25 20 45 55.56 68.84 501.5 3 6 9 33.33 68.89 501.7 4 9 13 30.77 68.94 501.9 8 20 28 28.57 69.04 502.4 2 17 19 10.53 69.14 502.9 2 11 13 15.38 69.24 503.4 2 13 15 13.33 69.34 503.8 0 28 28 0.00 69.44 504.3 0 8 8 0.00 69.54 504.8 0 2 2 0.00 69.64 505.3 0 10 10 0.00 69.74 505.7 0 7 7 0.00 69.83 506.2 0 11 11 0.00 69.94 506.7 2 22 24 8.33 70.04 507.0 0 5 5 0.00 70.14 507.3 1 18 19 5.26 70.24 507.5 1 41 42 2.38 70.34 507.8 0 114 114 0.00 70.54 508.4 1 37 38 2.63 70.64 508.7 0 63 63 0.00 70.74 508.9 2 92 94 2.13 70.84 509.2 0 11 11 0.00 70.94 509.5 0 20 20 0.00 71.04 509.8 1 21 22 4.55 71.14 510.1 1 30 31 3.23 71.24 510.3 0 24 24 0.00 71.34 510.6 0 29 29 0.00 71.44 511.3 0 12 12 0.00 71.54 511.9 0 68 68 0.00 71.74 513.2 0 92 92 0.00 71.84 513.8 1 27 28 3.57 71.94 514.5 3 38 41 7.32 72.04 515.1 1 33 34 2.94 72.14 515.8 1 48 49 2.04 72.24 516.4 3 82 85 3.53 72.34 517.1 2 50 52 3.85 72.44 517.7 1 35 36 2.78 72.54 518.4 2 58 60 3.33 72.64 519.0 0 19 19 0.00 72.74 519.6 4 42 46 8.70 72.84 520.2 0 5 5 0.00 72.94 520.8 2 13 15 13.33 73.04 521.3 1 13 14 7.14 73.14 521.8 1 33 34 2.94 73.24 522.4 4 32 36 11.11 73.34 522.9 1 16 17 5.88 73.44 523.5 2 45 47 4.26 73.54 524.0 2 39 41 4.88 73.64 524.6 0 13 13 0.00 73.74 525.2 0 18 18 0.00 73.84 525.8 1 35 36 2.78 73.94 526.4 1 30 31 3.23 74.04 527.0 2 17 19 10.53 74.14 527.5 1 18 19 5.26 74.24 528.1 6 19 25 24.00 74.34 528.7 24 18 42 57.14 74.44 529.3 3 1 4 75.00 74.54 529.9 26 1 27 96.30 74.63 530.4 113 2 115 98.26 74.74 530.7 5 0 5 100.00 74.84 531.0 5 0 5 100.00 74.94 531.2 11 1 12 91.67 75.04 531.4 24 0 24 100.00 75.14 531.7 43 0 43 100.00 75.24 531.9 13 1 14 92.86 75.34 532.2 9 0 9 100.00 75.38 532.3 1 0 1 100.00 75.44 532.4 12 0 12 100.00 75.48 532.4 7 1 8 87.50 75.53 532.5 4 0 4 100.00 75.58 532.6 19 4 23 82.61 75.63 532.7 15 1 16 93.75 75.68 532.8 17 11 28 60.71 75.78 533.0 109 72 181 60.22 75.88 533.2 5 10 15 33.33 75.98 533.3 17 33 50 34.00 76.08 533.6 0 15 15 0.00 76.19 533.8 1 55 56 1.79 76.28 534.0 2 18 20 10.00 76.38 534.3 1 5 6 16.67 76.48 534.5 8 46 54 14.81 76.58 534.7 2 41 43 4.65 76.68 535.0 1 28 29 3.45 76.78 535.6 5 54 59 8.47 76.98 536.7 3 20 23 13.04 77.08 537.3 3 18 21 14.29 77.18 537.9 4 36 40 10.00 77.28 538.5 4 49 53 7.55 77.38 539.0 5 52 57 8.77 77.48 539.9 7 48 55 12.73 77.58 540.7 9 72 81 11.11 77.69 541.6 11 48 59 18.64 77.78 542.4 21 23 44 47.73 77.88 543.4 12 4 16 75.00 77.98 544.5 7 2 9 77.78 78.08 545.6 23 4 27 85.19 78.18 546.7 11 37 48 22.92 78.28 547.8 17 40 57 29.82 78.38 548.8 9 44 53 16.98 78.48 549.9 23 57 80 28.75 78.58 551.0 12 60 72 16.67 78.68 552.1 25 142 167 14.97 78.78 553.2 45 124 169 26.63 78.88 554.2 12 58 70 17.14 78.98 555.3 4 112 116 3.45 79.08 556.4 22 148 170 12.94 79.19 557.6 29 220 249 11.65 79.28 558.6 14 135 149 9.40 79.38 559.6 2 51 53 3.77 79.48 560.7 12 65 77 15.58 79.58 561.8 24 165 189 12.70 79.68 562.9 12 163 175 6.86 79.78 564.0 7 108 115 6.09 79.88 565.0 7 82 89 7.87 79.98 566.1 8 160 168 4.76 80.03 567.2 14 108 122 11.48 80.08 568.3 9 144 153 5.88 80.13 569.4 15 52 67 22.39 80.18 570.4 13 203 216 6.02 80.23 571.5 26 81 107 24.30 80.28 572.6 27 74 101 26.73 80.33 573.7 15 146 161 9.32 80.41 574.5 13 124 137 9.49 80.53 575.8 11 80 91 12.09 80.63 576.9 40 76 116 34.48 80.73 578.0 31 18 49 63.27 80.83 579.1 10 32 42 23.81 80.93 580.2 12 14 26 46.15 81.03 581.2 25 55 80 31.25 81.13 582.3 50 84 134 37.31 81.23 583.4 23 79 102 22.55 81.33 584.5 41 104 145 28.28 81.43 585.6 16 62 78 20.51 81.53 586.6 13 98 111 11.71 81.63 587.7 13 132 145 8.97 81.73 588.8 5 46 51 9.80 81.83 589.9 31 26 57 54.39 81.93 591.0 1 46 47 2.13 82.03 592.0 2 96 98 2.04 82.13 593.1 7 110 117 5.98 82.23 594.2 6 116 122 4.92 82.33 595.3 1 110 111 0.90 82.63 598.5 11 156 167 6.59 82.93 601.8 69 135 204 33.82 83.23 605.0 19 135 154 12.34 83.53 608.2 17 124 141 12.06 83.83 611.5 6 114 120 5.00 84.13 614.7 1 28 29 3.45 84.43 618.0 1 76 77 1.30 84.73 619.6 2 22 24 8.33 85.03 622.2 5 128 133 3.76 85.13 623.8 21 38 59 35.59 85.33 626.9 6 39 45 13.33 85.53 630.0 32 114 146 21.92 85.73 633.1 24 102 126 19.05 86.03 637.7 18 84 102 17.65 86.33 639.9 25 51 76 32.89 86.73 644.0 10 71 81 12.35 86.93 646.3 25 79 104 24.04 87.13 648.6 21 96 117 17.95 87.33 650.7 2 77 79 2.53 87.53 651.7 2 68 70 2.86 87.63 652.2 1 29 30 3.33 87.99 655.4 3 36 39 7.69 88.19 658.3 0 18 18 0.00 88.39 661.6 3 63 66 4.55 88.59 665.0 5 144 149 3.36 88.69 666.7 12 161 173 6.94 88.89 670.1 9 191 200 4.50 89.09 673.5 10 115 125 8.00 89.29 675.4 10 240 250 4.00 89.49 677.3 4 106 110 3.64 89.91 681.2 0 74 74 0.00 90.31 683.8 6 93 99 6.06 90.51 685.1 1 70 71 1.41 90.71 686.4 0 31 31 0.00 90.91 688.0 0 0 0 0.00 91.11 689.7 1 13 14 7.14 91.31 691.1 1 39 40 2.50 91.51 692.6 3 32 35 8.57 91.71 693.3 0 20 20 0.00 91.91 694.0 2 39 41 4.88 92.21 695.9 0 18 18 0.00