# 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-1059.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 1059 # Location: northwestern subtropical Atlantic, Blake Bahama Outer Ridge # Northernmost_Latitude: 31.69 # Southernmost_Latitude: 31.69 # Easternmost_Longitude: -75.42 # Westernmost_Longitude: -75.42 # Elevation: -2997 #--------------------------------------- # Data_Collection # Collection_Name: ODP1059 G.trunc Billups2020 # First_Year: 416690 # Last_Year: 269570 # Time_Unit: cal yr BP # Core_Length: 23.1 # Notes: Ages are derived by tuning the Site 1059 CaCO3 record on the Greutzner et al. (2002) age model to the CaCO3 record from Site 1056, the ages of which have been updated using the oxygen isotope stratigraphy of Billups et al., 2011: 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 derived by tuning the Site 1059 CaCO3 record on the Greutzner et al. (2002) age model to the CaCO3 record from Site 1056, the ages of which have been updated using the oxygen isotope stratigraphy of Billups et al., 2011: 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. #--------------------------------------- # 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 72.02 269.57 0 18 18 0 72.12 270.03 0 9 9 0 72.22 270.49 0 1 1 0 72.32 270.95 0 1 1 0 72.42 271.41 1 2 3 33 72.52 271.89 4 15 19 21 72.62 272.37 16 19 35 46 72.72 272.86 5 16 21 24 72.82 273.34 0 6 6 0 72.92 273.82 2 5 7 29 73.02 274.31 3 5 8 38 73.12 274.79 0 2 2 0 73.22 275.28 1 3 4 25 73.32 275.76 6 3 9 67 73.42 276.24 12 2 14 86 73.52 276.73 4 1 5 80 73.62 277.21 1 12 13 8 73.72 277.69 2 7 9 22 73.82 278.18 5 6 11 45 73.92 278.66 47 13 60 78 74.02 279.15 9 1 10 90 74.12 279.63 10 3 13 77 74.22 280.12 2 10 12 17 74.32 280.65 24 8 32 75 74.42 281.39 38 17 55 69 74.52 282.14 37 12 49 76 74.72 283.62 21 20 41 51 74.92 285.30 0 22 22 0 75.02 286.31 1 24 25 4 75.12 287.32 1 26 27 4 75.22 288.39 8 18 26 31 75.32 289.70 41 77 118 35 75.42 290.61 6 61 67 9 75.52 291.52 50 31 81 62 75.62 292.43 176 14 190 93 75.63 292.52 72 10 82 88 75.73 293.40 28 1 29 97 75.83 294.00 15 5 20 75 75.93 294.60 16 24 40 40 76.03 295.20 38 68 106 36 76.13 295.80 104 11 115 90 76.23 296.40 63 12 75 84 76.33 297.00 108 24 132 82 76.43 297.60 12 8 20 60 76.53 298.20 33 54 87 38 76.63 298.79 18 26 44 41 76.73 299.39 29 36 65 45 76.83 299.99 54 74 128 42 76.93 300.59 70 22 92 76 77.03 301.29 99 27 126 79 77.13 301.99 41 17 58 71 77.23 302.69 97 6 103 94 77.33 303.39 120 28 148 81 77.43 304.10 73 60 133 55 77.53 304.80 46 77 123 37 77.63 305.50 28 93 121 23 77.73 306.34 4 67 71 6 77.83 307.24 3 134 137 2 77.93 308.15 1 85 86 1 78.03 309.05 1 26 27 4 78.13 309.95 1 36 37 3 78.23 310.85 1 48 49 2 78.33 311.75 2 45 47 4 78.43 312.65 2 71 73 3 78.53 313.56 4 246 250 2 78.63 314.46 5 232 237 2 78.83 316.26 5 219 224 2 78.93 317.16 2 123 125 2 79.03 318.06 2 94 96 2 79.13 318.97 5 171 176 3 79.23 319.87 10 85 95 11 79.33 320.77 29 147 176 16 79.43 322.07 55 133 188 29 79.53 323.43 38 84 122 31 79.63 324.78 27 91 118 23 79.73 326.13 4 139 143 3 79.83 327.47 6 164 170 4 79.93 328.53 5 158 163 3 80.33 332.44 6 116 122 5 80.43 333.42 2 113 115 2 80.53 334.27 0 58 58 0 80.63 334.99 4 33 37 11 80.73 335.61 2 83 85 2 80.83 336.24 1 81 82 1 80.93 336.86 5 88 93 5 81.03 337.49 2 281 283 1 81.13 338.12 4 129 133 3 81.23 338.74 4 74 78 5 81.33 339.37 21 102 123 17 81.43 339.99 19 21 40 48 81.53 340.62 126 6 132 95 81.63 341.24 40 1 41 98 81.73 341.86 77 3 80 96 81.83 342.48 46 2 48 96 81.93 343.10 13 2 15 87 82.03 343.72 18 5 23 78 82.13 344.34 17 5 22 77 82.23 344.96 6 3 9 67 82.33 345.58 7 4 11 64 82.43 346.20 0 1 1 0 82.53 346.82 1 9 10 10 82.63 347.44 3 12 15 20 82.73 348.07 20 43 63 32 82.83 348.61 45 39 84 54 82.93 349.09 54 60 114 47 83.03 349.58 69 31 100 69 83.13 350.06 52 93 145 36 83.33 351.03 54 71 125 43 83.43 351.52 11 48 59 19 83.53 352.00 24 55 79 30 83.63 352.49 26 61 87 30 83.73 352.97 26 101 127 20 83.75 353.07 37 5 42 88 83.85 353.51 45 20 65 69 83.95 353.86 63 15 78 81 84.05 354.20 11 5 16 69 84.15 354.55 15 12 27 56 84.25 354.89 5 1 6 83 84.45 355.58 0 6 6 0 84.55 355.94 8 2 10 80 84.65 356.30 2 28 30 7 84.75 356.66 1 17 18 6 84.85 357.02 2 7 9 22 84.95 357.38 1 8 9 11 85.05 357.74 7 5 12 58 85.15 358.10 2 5 7 29 85.25 358.46 1 6 7 14 85.35 358.82 6 7 13 46 85.45 359.18 1 12 13 8 85.55 359.54 0 0 0 0 85.65 359.90 4 6 10 40 85.75 360.26 1 5 6 17 85.85 360.62 1 1 2 50 85.95 360.98 4 11 15 27 86.05 361.34 4 4 8 50 86.15 361.69 3 1 4 75 86.25 362.05 2 2 4 50 86.35 362.41 0 0 0 0 86.32 362.31 13 18 31 42 86.42 362.67 0 0 0 0 86.52 363.03 8 5 13 62 86.62 363.38 2 1 3 67 86.72 363.74 4 5 9 44 86.82 364.12 7 1 8 88 86.92 364.52 2 4 6 33 87.02 364.92 3 4 7 43 87.12 365.32 1 3 4 25 87.22 365.72 6 2 8 75 87.32 366.12 3 0 3 100 87.42 366.52 10 2 12 83 87.52 366.92 1 2 3 33 87.62 367.32 1 2 3 33 87.72 367.72 10 0 10 100 87.82 368.12 1 5 6 17 87.92 368.52 2 0 2 100 88.02 368.92 1 7 8 13 88.12 369.32 15 6 21 71 88.22 369.72 6 4 10 60 88.32 370.12 18 10 28 64 88.42 370.52 1 11 12 8 88.52 370.92 19 8 27 70 88.62 371.32 23 14 37 62 88.72 371.72 29 3 32 91 88.82 372.12 11 2 13 85 88.92 372.52 3 9 12 25 89.02 372.92 5 43 48 10 89.12 373.38 11 3 14 79 89.22 373.88 5 13 18 28 89.32 374.37 20 32 52 38 89.42 374.86 5 13 18 28 89.52 375.36 6 9 15 40 89.62 375.85 1 7 8 13 89.72 376.35 4 21 25 16 89.82 376.84 6 43 49 12 89.92 377.34 11 59 70 16 90.02 377.83 8 67 75 11 90.12 378.33 8 19 27 30 90.22 378.82 6 16 22 27 90.32 379.32 1 14 15 7 90.42 379.81 1 72 73 1 90.52 380.33 3 63 66 5 90.62 381.05 3 21 24 13 90.72 381.79 1 13 14 7 90.82 382.53 3 26 29 10 90.92 383.27 3 51 54 6 91.02 384.01 1 45 46 2 91.12 384.76 3 91 94 3 91.22 385.50 2 104 106 2 91.32 386.24 10 81 91 11 91.42 386.98 58 148 206 28 91.52 387.72 82 29 111 74 91.62 388.55 209 26 235 89 91.72 389.43 16 11 27 59 91.82 390.05 4 14 18 22 91.92 390.57 1 25 26 4 92.02 391.08 2 20 22 9 92.12 391.58 0 19 19 0 92.22 392.10 3 30 33 9 92.32 392.61 3 66 69 4 92.42 393.12 6 127 133 5 92.52 393.63 9 85 94 10 92.72 394.65 10 139 149 7 92.82 395.16 11 113 124 9 92.92 395.67 35 98 133 26 93.02 396.18 100 140 240 42 93.12 396.69 51 89 140 36 93.22 397.20 34 84 118 29 93.32 397.71 28 97 125 22 93.42 398.22 40 184 224 18 93.52 398.73 106 207 313 34 93.62 399.24 32 113 145 22 93.72 399.75 2 153 155 1 93.72 399.75 7 79 86 8 93.82 400.26 4 111 115 3 93.92 400.77 3 197 200 2 94.02 401.28 2 199 201 1 94.12 401.79 5 138 143 3 94.22 402.30 6 215 221 3 94.32 402.81 26 347 373 7 94.42 403.32 25 191 216 12 94.52 404.32 21 121 142 15 94.62 406.38 41 164 205 20 94.72 408.44 16 159 175 9 94.82 410.50 7 187 194 4 94.92 412.56 2 194 196 1 95.02 414.62 7 274 281 2 95.12 416.69 3 189 192 2