# 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-1056.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: in review # 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: # 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 1056 # Location: North Atlantic Ocean # Northernmost_Latitude: 34.49 # Southernmost_Latitude: 34.49 # Easternmost_Longitude: -76.33 # Westernmost_Longitude: -76.33 # Elevation: -2178 #--------------------------------------- # Data_Collection # Collection_Name: ODP1056 G.trunc Billups2020 # First_Year: 459800 # Last_Year: 258850 # Time_Unit: cal yr BP # Core_Length: 22.69m # Notes: Ages are based on oxygen isotope stratigrpahy from: Billups, K., Rabideaux, N., and Stoffel, J., (2011), Suborbital-Scale Surface and Deep Water Records in the Subtropical North Atlantic: Implications on Thermohaline Overturn: Quaternary Science Reviews, 30, 2976-2987. #--------------------------------------- # Chronology_Information # Chronology: # Ages are based on oxygen isotope stratigrpahy from: Billups, K., Rabideaux, N., and Stoffel, J., (2011), Suborbital-Scale Surface and Deep Water Records in the Subtropical North Atlantic: Implications on Thermohaline Overturn: Quaternary Science Reviews, 30, 2976-2987. # Chronology Table (Use as many rows and columns are needed below this line) NOTE: Additional Chronology tables should be put below the first one with no blank lines. # #--------------------------------------- # 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 26.96 258.85 1.0 23.0 24 4.2 27.01 259.27 0.0 42.0 42 0.0 27.06 259.69 0.0 20.0 20 0.0 27.11 260.115 1.0 54.0 55 1.8 27.16 260.54 0.0 49.0 49 0.0 27.21 260.96 2.0 18.0 20 10.0 27.26 261.38 0.0 48.0 48 0.0 27.33 261.98 0.0 7.0 7 0.0 27.36 262.23 2.0 55.0 57 3.5 27.41 262.65 0.0 20.0 20 0.0 27.46 263.08 1.0 21.0 22 4.5 27.51 263.5 3.0 19.0 22 13.6 27.56 264.08 2.0 108.0 110 1.8 27.61 264.67 1.0 87.0 88 1.1 27.66 265.25 0.0 38.0 38 0.0 27.71 265.83 1.0 41.0 42 2.4 27.76 266.42 0.0 46.0 46 0.0 27.81 267 1.0 12.0 13 7.7 27.86 267.58 2.0 42.0 44 4.5 27.91 268.17 7.0 52.0 59 11.9 27.98 268.98 4.0 42.0 46 8.7 28.01 269.33 4.0 18.0 22 18.2 28.08 270.15 36.0 55.0 91 39.6 28.11 270.5 4.0 10.0 14 28.6 28.16 271.08 9.0 28.0 37 24.3 28.21 271.67 6.0 2.0 8 75.0 28.26 272.25 6.0 12.0 18 33.3 28.31 272.83 1.0 6.0 7 14.3 28.35 273.3 11.0 17.0 28 39.3 28.41 274 4.0 26.0 30 13.3 28.46 274.58 5.0 27.0 32 15.6 28.49 274.93 4.0 5.0 9 44.4 28.56 275.75 28.0 27.0 55 50.9 28.61 276.33 81.0 47.0 128 63.3 28.66 276.92 25.0 16.0 41 61.0 28.71 277.5 15.0 2.0 17 88.2 28.76 277.89 31.0 12.0 43 72.1 28.81 278.27 26.0 11.0 37 70.3 28.86 278.66 19.0 22.0 41 46.3 28.91 279.04 8.0 17.0 25 32.0 28.97 279.5 7.0 32.0 39 17.9 29.01 279.81 10.0 38.0 48 20.8 29.06 280.2 6.0 39.0 45 13.3 29.11 280.58 6.0 14.0 20 30.0 29.16 280.97 34.0 9.0 43 79.1 29.21 281.35 44.0 14.0 58 75.9 29.26 281.74 21.0 45.0 66 31.8 29.31 282.13 26.0 53.0 79 32.9 29.35 282.43 33.0 70.0 103 32.0 29.41 282.9 12.0 86.0 98 12.2 29.46 283.66 9.0 105.0 114 7.9 29.51 284.43 4.0 46.0 50 8.0 29.54 284.89 3.0 75.0 78 3.8 29.61 285.97 1.9 136.1 138 1.4 29.66 286.73 2.9 144.1 147 2.0 29.71 287.5 4.0 245.0 249 1.6 29.76 288.29 6.0 50.0 56 10.7 29.81 289.07 26.0 122.0 148 17.6 29.86 289.86 34.9 147.1 182 19.2 29.91 290.64 13.0 61.0 74 17.6 29.96 291.43 14.0 125.0 139 10.1 30.01 292.21 12.0 5.0 17 70.6 30.06 293 63.0 6.0 69 91.3 30.11 293.43 60.0 8.0 68 88.2 30.16 293.87 77.0 4.0 81 95.1 30.21 294.3 84.0 12.0 96 87.5 30.26 294.74 43.0 2.0 45 95.6 30.31 295.17 39.0 4.0 43 90.7 30.36 295.61 27.0 32.0 59 45.8 30.41 296.04 30.0 2.0 32 93.8 30.45 296.39 22.0 17.0 39 56.4 30.51 296.91 15.0 3.0 18 83.3 30.56 297.34 20.0 63.0 83 24.1 30.61 298.03 5.0 32.0 37 13.5 30.66 298.72 22.0 37.0 59 37.3 30.71 299.41 32.0 8.0 40 80.0 30.76 300.1 24.0 5.0 29 82.8 30.81 300.79 30.0 41.0 71 42.3 30.86 301.48 23.0 64.0 87 26.4 30.91 302.17 10.0 55.0 65 15.4 30.96 302.81 33.0 115.0 148 22.3 31.04 303.83 43.0 140.0 183 23.5 31.11 304.72 46.1 93.9 140 32.9 31.16 305.36 45.0 89.0 134 33.6 31.21 306 35.0 37.0 72 48.6 31.26 306.6 121.1 73.9 195 62.1 31.31 307.21 190.0 62.0 252 75.4 31.36 307.81 171.0 57.0 228 75.0 31.41 308.41 100.9 51.1 152 66.4 31.46 309.01 63.0 42.0 105 60.0 31.51 309.62 35.0 80.0 115 30.4 31.56 310.22 18.0 91.0 109 16.5 31.61 310.82 9.0 25.0 34 26.5 31.66 311.42 5.0 12.0 17 29.4 31.71 311.85 6.0 30.0 36 16.7 31.76 312.28 2.0 78.0 80 2.5 31.82 312.8 1.0 101.0 102 1.0 31.86 313.14 1.0 100.0 101 1.0 31.92 313.66 0.9 153.1 154 0.6 31.96 314 2.0 84.0 86 2.3 32.01 314.88 1.0 54.0 55 1.8 32.06 315.75 3.0 79.0 82 3.7 32.11 316.63 4.0 83.0 87 4.6 32.26 318.12 1.0 52.0 53 1.9 32.31 318.43 2.0 62.0 64 3.1 32.36 318.75 14.0 66.0 80 17.5 32.41 319.06 13.0 65.0 78 16.7 32.46 319.37 1.0 115.0 116 0.9 32.51 319.68 2.0 47.0 49 4.1 32.54 319.87 3.0 112.0 115 2.6 32.61 320.3 4.1 164.9 169 2.4 32.66 320.61 3.0 133.0 136 2.2 32.71 320.92 3.0 105.0 108 2.8 32.76 321.24 2.0 108.0 110 1.8 32.81 321.56 5.0 108.0 113 4.4 32.86 321.88 6.0 128.0 134 4.5 32.91 322.2 1.0 130.0 131 0.8 32.96 322.52 0.9 154.1 155 0.6 33.01 322.84 1.0 190.0 191 0.5 33.06 323.16 0.0 160.0 160 0.0 33.11 323.48 7.0 206.0 213 3.3 33.16 323.8 12.0 192.0 204 5.9 33.21 324.12 7.9 118.1 126 6.3 33.26 324.44 28.0 169.0 197 14.2 33.33 324.88 17.0 114.0 131 13.0 33.36 325.16 25.0 152.0 177 14.1 33.41 325.62 24.0 231.0 255 9.4 33.46 326.08 8.0 187.0 195 4.1 33.51 326.54 1.0 193.0 194 0.5 33.56 327 5.9 214.1 220 2.7 33.63 327.64 4.9 200.1 205 2.4 33.68 328.1 4.0 187.0 191 2.1 33.71 328.37 5.0 189.0 194 2.6 33.76 328.83 8.1 143.9 152 5.3 33.86 329.75 6.9 197.1 204 3.4 33.91 330.21 2.0 123.0 125 1.6 33.96 330.67 1.0 95.0 96 1.0 34.01 331.13 1.0 121.0 122 0.8 34.04 331.4 1.0 68.0 69 1.4 34.11 332.05 1.0 93.0 94 1.1 34.16 332.51 3.0 124.0 127 2.4 34.21 332.97 0.0 147.0 147 0.0 34.26 333.42 5.1 249.9 255 2.0 34.31 333.78 10.0 123.0 133 7.5 34.34 334 18.1 182.9 201 9.0 34.36 334.14 16.6 129.9 146.5 11.3 34.41 334.5 23.7 87.8 111.5 21.3 34.46 334.72 88.9 34.6 123.5 72.0 34.54 335.08 82.8 16.2 99 83.6 34.56 335.44 56.0 22.0 78 71.8 34.64 335.87 31.1 30.9 62 50.1 34.66 336.3 13.6 38.4 52 26.2 34.74 336.585 19.0 31.0 50 38.0 34.76 336.87 18.0 102.0 120 15.0 34.84 337.23 12.0 54.0 66 18.2 34.86 337.59 21.0 39.0 60 35.0 34.94 337.95 41.0 88.0 129 31.8 34.96 338.31 31.0 115.0 146 21.2 35.04 338.67 40.0 48.0 88 45.5 35.06 339.03 46.0 66.0 112 41.1 35.14 339.46 17.0 52.0 69 24.6 35.16 339.89 30.0 67.0 97 30.9 35.24 340.25 25.9 123.1 149 17.4 35.26 340.61 39.0 64.0 103 37.9 35.34 340.9 13.1 84.9 98 13.4 35.36 341.19 18.0 92.0 110 16.4 35.44 341.55 17.0 73.0 90 18.9 35.46 341.91 14.0 110.0 124 11.3 35.54 342.34 22.7 51.8 74.5 30.5 35.56 342.77 46.4 126.1 172.5 26.9 35.64 343.055 13.0 49.0 62 21.0 35.66 343.34 14.0 28.0 42 33.3 35.74 343.775 8.0 48.0 56 14.3 35.84 344.21 15.1 121.9 137 11.0 35.86 344.78 13.0 111.0 124 10.5 35.94 345.14 1.0 54.0 55 1.8 35.96 345.5 3.0 49.0 52 5.8 36.04 345.86 0.8 26.7 27.5 3.0 36.06 347.04 6.0 33.0 39 15.4 36.16 347.7 16.0 54.0 70 22.9 36.26 348.26 35.0 29.0 64 54.7 36.36 348.86 36.0 9.0 45 80.0 36.46 349.46 12.0 21.0 33 36.4 36.56 350.06 40.0 19.0 59 67.8 36.66 350.66 56.0 32.0 88 63.6 36.76 351.26 47.0 21.0 68 69.1 36.86 351.86 44.0 47.0 91 48.4 36.96 352.4 34.0 34.0 68 50.0 37.06 352.96 24.0 19.0 43 55.8 37.16 353.56 12.0 86.0 98 12.2 37.34 354.7 8.0 42.0 50 16.0 37.46 355.9 0.0 13.0 13 0.0 37.56 356.4 0.0 5.0 5 0.0 37.67 356.8 15.0 11.0 26 57.7 37.76 357.2 11.0 7.0 18 61.1 37.86 357.65 14.0 6.0 20 70.0 37.96 358.2 2.0 23.0 25 8.0 38.06 358.8 0.0 7.0 7 0.0 38.15 359.4 14.0 9.0 23 60.9 38.25 360 5.0 11.0 16 31.3 38.35 360.573 6.0 4.0 10 60.0 38.46 361.233 18.0 5.0 23 78.3 38.55 361.8 8.0 6.0 14 57.1 38.65 362.35 8.0 24.0 32 25.0 38.75 362.85 13.0 8.0 21 61.9 38.87 363.575 22.0 4.0 26 84.6 38.95 364.1 11.0 60.0 71 15.5 39.05 364.7 13.0 97.0 110 11.8 39.15 365.3 51.0 30.0 81 63.0 39.36 366.56 33.0 47.0 80 41.3 39.45 367.1 11.0 72.0 83 13.3 39.65 368.2 3.0 77.0 80 3.8 39.75 368.8 5.0 74.0 79 6.3 39.91 369.871 12.0 65.0 77 15.6 40.05 370.553 0.0 94.0 94 0.0 40.12 370.995 3.0 81.0 84 3.6 40.16 371.247 4.0 170.0 174 2.3 40.24 371.8 19.1 160.9 180 10.6 40.34 372.35 11.0 357.0 368 3.0 40.44 372.84 27.9 123.1 151 18.5 40.54 373.44 90.9 38.1 129 70.5 40.64 374.067 66.0 36.0 102 64.7 40.73 374.618 23.0 26.0 49 46.9 40.84 375.52 11.0 93.0 104 10.6 40.94 376.78 7.0 87.0 94 7.4 41.04 378.02 14.0 208.0 222 6.3 41.14 379.28 16.0 151.0 167 9.6 41.24 380.52 6.0 161.0 167 3.6 41.34 381.78 13.1 108.9 122 10.7 41.44 382.973 100.0 62.0 162 61.7 41.55 384.333 28.9 105.1 134 21.6 41.64 385.52 46.9 270.1 317 14.8 41.74 386.78 37.0 269.0 306 12.1 41.84 388.02 72.0 77.0 149 48.3 41.94 389.28 47.0 104.0 151 31.1 42.04 390.6 5.0 160.1 165 3.0 42.15 392.182 2.0 125.0 127 1.6 42.25 393.667 1.0 95.0 96 1.0 42.34 395.1 2.0 105.0 107 1.9 42.44 396.6 3.0 107.0 110 2.7 42.64 399.6 9.9 134.1 144 6.9 42.74 401.1 40.0 194.0 234 17.1 42.83 402.563 49.0 183.0 232 21.1 42.94 404.25 33.0 139.0 172 19.2 43.14 407.1 9.0 106.0 115 7.8 43.24 408.4 8.0 148.0 156 5.1 43.34 409.327 8.0 95.0 103 7.8 43.45 410.344 7.1 104.9 112 6.3 43.54 411.3 2.0 101.0 103 1.9 43.64 412.26 9.1 179.9 189 4.8 43.74 413.2 5.0 179.0 184 2.7 43.84 414.16 3.0 153.0 156 1.9 43.94 415.1 9.0 134.0 143 6.3 44.04 416.1 5.0 75.0 80 6.3 44.15 417.15 0.0 44.0 44 0.0 44.35 419.1 3.0 19.0 22 13.6 44.48 420.32 1.0 13.0 14 7.1 44.54 420.695 3.0 16.0 19 15.8 44.58 421.864 3.0 13.0 16 18.8 44.64 422.108 0.0 21.0 21 0.0 44.68 422.303 0.0 7.0 7 0.0 44.74 422.9 5.0 9.0 14 35.7 44.84 423.9 14.0 15.0 29 48.3 44.95 424.85 42.0 54.0 96 43.8 45.05 425.8 144.0 101.0 245 58.8 45.15 426.8 106.0 20.0 126 84.1 45.25 427.75 77.0 66.0 143 53.8 45.35 428.7 21.0 137.0 158 13.3 45.45 429.65 17.0 108.0 125 13.6 45.55 430.6 3.0 109.0 112 2.7 45.65 431.6 3.0 108.0 111 2.7 45.75 433.05 45.0 130.0 175 25.7 45.85 434 11.0 76.0 87 12.6 45.95 434.35 50.0 25.0 75 66.7 46.05 435 80.0 16.0 96 83.3 46.15 435.65 105.0 54.0 159 66.0 46.25 436.3 105.0 54.0 159 66.0 46.35 436.95 43.0 57.0 100 43.0 46.45 437.6 36.0 71.0 107 33.6 46.55 438.25 2.0 121.0 123 1.6 46.65 438.9 3.0 87.0 90 3.3 46.75 439.55 2.0 72.0 74 2.7 46.85 440.2 3.0 100.0 103 2.9 46.95 440.85 3.0 41.0 44 6.8 47.05 441.5 0.0 18.0 18 0.0 47.15 442.15 5.0 37.0 42 11.9 47.25 442.85 3.0 22.0 25 12.0 47.35 443.5 5.0 34.0 39 12.8 47.45 444.15 4.0 3.0 7 57.1 47.55 444.8 80.0 35.0 115 69.6 47.65 445.45 22.0 68.0 90 24.4 47.75 446.1 7.0 43.0 50 14.0 47.85 446.75 2.0 28.0 30 6.7 48.05 448.05 11.0 53.0 64 17.2 48.15 448.7 4.0 33.0 37 10.8 48.25 449.35 2.0 17.0 19 10.5 48.35 450 0.0 48.0 48 0.0 48.45 450.65 0.0 12.0 12 0.0 48.55 451.3 4.0 89.0 93 4.3 48.65 451.95 1.0 18.0 19 5.3 48.75 452.65 0.0 50.0 50 0.0 48.85 453.3 2.0 125.0 127 1.6 48.95 453.95 2.0 162.0 164 1.2 49.05 454.9 2.0 81.0 83 2.4 49.15 456.075 3.0 184.0 187 1.6 49.25 457.025 2.0 68.0 70 2.9 49.35 457.85 1.1 104.0 105 1.0 49.45 458.5 2.0 111.0 113 1.8 49.55 459.15 2.0 76.0 78 2.6 49.65 459.8 11.0 105.0 116 9.5