# Northwestern Subtropical Atlantic G. truncatulinoides Coiling Ratio Data over the past 280 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/30972 # Description: NOAA Landing Page # Online_Resource: https://www.ncei.noaa.gov/pub/data/paleo/contributions_by_author/billups2016/billups2016-odp1059.txt # Description: NOAA location of the template # # # Data_Type: Paleoceanography # # Dataset_DOI: # # Parameter_Keywords: population abundance #--------------------------------------- # Contribution_Date # Date: 2020-08-25 #--------------------------------------- # File_Last_Modified_Date # Date: 2020-08-25 #--------------------------------------- # Title # Study_Name: Northwestern Subtropical Atlantic G. truncatulinoides Coiling Ratio Data over the past 280 kyr #--------------------------------------- # Investigators # Investigators: Billups, Katharina; Hudson, C.; Kunz, H.; Rew, Isabelle #--------------------------------------- # Description_Notes_and_Keywords # Description: # Provided Keywords: Pleistocene, Globorotalia truncatulinoides, subtropical gyre, water column structure, North Atlantic Ocean #--------------------------------------- # Publication # Authors: Billups, K., C. Hudson, H. Kunz, and I. Rew # Published_Date_or_Year: 2016 # Published_Title: Exploring Globorotalia truncatulinoides coiling ratios as a proxy for subtropical gyre dynamics in the northwestern Atlantic Ocean during late Pleistocene Ice Ages # Journal_Name: Paleoceanography # Volume: 31 # Edition: # Issue: # Pages: # Report_Number: # DOI: 10.1002/2016PA002927 # Online_Resource: # Full_Citation: # Abstract: We explore the use of the coiling direction of planktic foraminifer Globorotalia truncatulinoides in sediment cores from the northwestern subtropical Atlantic Ocean as a proxy for variations in the intensity of the western boundary of the subtropical gyre over the past 280 kyr. Core-top sediments from the study region are dominated by the left coiling variety consistent with the deep permanent thermocline at the study sites (KNR140-37PC and Ocean Drilling Program Site 1059). Down-core G. truncatulinoides (sinistral) maxima occur in conjunction with 14 out of the 25 (Northern and Southern Hemisphere) precession maxima contained in the study interval. The agreement between the dominance of left coiling tests and the precession index of the Southern Hemisphere, in particular, supports a link between a deep thermocline in the northwestern subtropical Atlantic and northward flow of equatorially-sourced warm surface currents, a situation analogues to the Late Holocene. Interglacial Marine Isotope Stage (MIS) 5 lacks G. truncatulinoides (s) minima attesting to the relative stability of the western boundary during an interval of prolonged global warmth. G. truncatulinoides (s) disappear during the glacial extremes of MIS 2, 6, and 8 implying a weaker western boundary current at these times. Our results support that the coiling direction of this species is sensitive to variations in hydrography of the western boundary of the subtropical gyre. Because of the association between G. truncatulinoides (s) and precession maxima in both hemispheres, results support the importance of oceanic heat transport in half-precession climate variability in the North Atlantic. #--------------------------------------- # Funding_Agency # Funding_Agency_Name: # Grant: #--------------------------------------- # Site_Information # Site_Name: ODP 1059 # Location: North Atlantic Ocean # 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 coiling Billups2016 # First_Year: 280880 # Last_Year: 132300 # Time_Unit: cal yr BP # Core_Length: 31.32 # Notes: Age model is based on tuning the planktic foraminiferal d18O record to Northern Hemisphere summer insolation (Billups and Sceinwald, 2014): Billups, K., and Scheinwald, A., (2014). Origin of millennial-scale climate signals in the subtropical North Atlantic: Paleoceanography, 29, 612-627. doi:10.1002/2014PA002641. #--------------------------------------- # Chronology_Information # Chronology: # Age model is based on tuning the planktic foraminiferal d18O record to Northern Hemisphere summer insolation (Billups and Sceinwald, 2014): Billups, K., and Scheinwald, A., (2014). Origin of millennial-scale climate signals in the subtropical North Atlantic: Paleoceanography, 29, 612-627. doi:10.1002/2014PA002641. #--------------------------------------- # 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 39.62 132.30 3.00 45.00 48.00 6 39.72 132.65 7.00 36.00 43.00 16 39.82 133.01 33.00 61.00 94.00 35 39.92 133.36 41.00 44.00 85.00 48 40.02 133.72 27.00 31.00 58.00 47 40.12 134.07 11.00 20.00 31.00 35 40.22 134.42 9.00 17.00 26.00 35 40.32 134.78 18.00 59.00 77.00 23 40.72 135.99 4.00 20.00 24.00 16.67 40.92 136.37 2.00 18.00 20.00 10.00 41.32 137.14 0.00 21.00 21.00 0.00 41.72 137.90 6.00 13.00 19.00 31.58 42.12 138.76 3.00 30.00 33.00 9.09 42.52 139.63 17.00 10.00 27.00 62.96 42.67 139.95 12.00 3.00 15.00 80 42.72 140.06 15.00 4.00 19.00 79 42.77 140.17 19.00 4.00 23.00 83 43.12 140.93 20.00 10.00 30.00 66.67 43.42 141.62 10.00 11.00 21.00 47.62 43.81 142.43 8.00 9.00 17.00 47.06 44.21 143.30 3.00 22.00 25.00 12.00 44.61 144.27 0.00 25.00 25.00 0.00 45.01 145.30 1.00 25.00 26.00 3.85 45.46 146.46 0.00 21.00 21.00 0.00 45.86 147.49 0.00 10.00 10.00 0.00 46.26 148.18 0.00 8.00 8.00 0.00 46.66 148.55 0.00 16.00 16.00 0.00 47.06 148.92 0.00 13.00 13.00 0.00 47.46 149.29 0.00 31.00 31.00 0.00 47.81 149.61 2.00 13.00 15.00 13.33 48.21 149.98 3.00 13.00 16.00 18.75 48.26 150.02 1.00 11.00 12.00 8 48.66 150.40 0.00 10.00 10.00 0.00 49.06 150.92 0.00 13.00 13.00 0.00 49.46 151.44 2.00 19.00 21.00 9.52 49.86 151.96 4.00 6.00 10.00 40.00 50.26 152.48 2.00 27.00 29.00 6.90 50.66 153.00 2.00 15.00 17.00 11.76 51.06 153.52 0.00 2.00 2.00 0.00 51.46 154.04 0.00 7.00 7.00 0.00 51.76 154.43 0.00 18.00 18.00 0.00 52.16 155.09 0.00 4.00 4.00 0.00 52.51 155.69 0.00 26.00 26.00 0.00 52.86 156.30 4.00 64.00 68.00 5.88 53.26 156.99 0.00 15.00 15.00 0.00 53.65 157.67 0.00 41.00 41.00 0.00 54.05 158.34 0.00 16.00 16.00 0.00 54.65 160.08 0.00 33.00 33.00 0.00 55.35 165.13 1.00 16.00 17.00 5.88 55.65 167.30 1.00 25.00 26.00 3.85 56.05 170.19 6.00 79.00 33.00 18 56.35 172.56 11.00 88.00 99.00 11.11 56.70 175.16 3.00 30.00 33.00 9 57.05 177.68 0.00 34.00 34.00 0.00 57.40 180.20 0.00 28.00 34.00 0 57.80 183.08 6.00 43.00 49.00 12 58.30 186.00 1.00 84.00 85.00 0.00 58.70 187.60 0.00 9.00 9.00 0 59.10 189.20 0.00 6.00 6.00 0 59.30 190.00 0.00 22.00 22.00 0.00 59.70 191.60 1.00 12.00 13.00 7.69 59.65 191.40 3.00 155.00 158.00 1.90 59.70 191.60 1.00 26.00 27.00 3.70 59.75 191.80 2.00 48.00 50.00 4.00 59.80 192.00 1.00 83.00 84.00 1.19 59.85 192.20 0.00 55.00 55.00 0.00 59.90 192.40 0.00 30.00 30.00 0.00 59.95 192.60 1.00 12.00 13.00 7.69 60.00 192.80 1.00 40.00 41.00 2.44 60.05 193.00 3.00 47.00 50.00 6.00 60.10 193.20 3.00 24.00 27.00 11.11 60.15 193.40 16.00 50.00 66.00 24.24 60.20 193.60 127.00 54.00 181.00 70.17 60.25 193.80 199.00 79.00 278.00 71.58 60.30 194.00 138.00 60.00 198.00 69.70 60.35 194.20 124.00 75.00 199.00 62.31 60.40 194.40 81.00 43.00 124.00 65.32 60.45 194.60 90.00 13.00 103.00 87.38 60.50 194.80 166.00 58.00 224.00 74.11 60.55 195.00 166.00 91.00 257.00 64.59 60.60 195.20 106.00 53.00 159.00 66.67 60.65 195.40 115.00 72.00 187.00 61.50 60.70 195.60 131.00 117.00 248.00 52.82 60.75 195.80 118.00 85.00 203.00 58.13 60.80 196.00 227.00 125.00 352.00 64.49 60.85 196.55 287.00 139.00 426.00 67.37 60.90 198.19 180.00 79.00 259.00 69.50 60.95 198.42 201.00 123.00 324.00 62.04 61.00 198.65 388.00 134.00 522.00 74.33 61.05 198.74 241.00 72.00 313.00 77.00 61.10 199.29 287.00 270.00 557.00 51.53 61.15 199.84 145.00 153.00 298.00 48.66 61.20 200.39 126.00 204.00 330.00 38.18 61.25 200.93 45.00 166.00 211.00 21.33 61.30 201.48 23.00 207.00 230.00 10.00 61.35 202.52 33.00 217.00 250.00 13.20 61.40 203.56 50.00 142.00 192.00 26.04 61.45 204.60 35.00 75.00 110.00 31.82 61.50 206.00 96.00 128.00 224.00 42.86 61.55 207.04 291.00 300.00 591.00 49.24 61.60 207.71 179.00 317.00 496.00 36.09 61.65 208.57 89.00 312.00 401.00 22.19 61.70 209.43 30.00 263.00 293.00 10.24 61.75 210.29 10.00 185.00 195.00 5.13 61.80 211.14 13.00 119.00 132.00 9.85 61.85 212.00 7.00 147.00 154.00 4.55 61.90 212.86 1.00 109.00 110.00 0.91 61.95 213.71 1.00 94.00 95.00 1.05 62.00 214.57 0.00 18.00 18.00 0.00 62.05 215.43 0.00 2.00 2.00 0.00 62.10 216.29 5.00 80.00 85.00 5.88 62.15 217.14 1.00 25.00 26.00 3.85 62.20 218.00 0.00 34.00 34.00 0.00 62.25 219.50 4.00 47.00 51.00 7.84 62.30 221.00 27.00 167.00 194.00 13.92 62.35 222.50 60.00 136.00 196.00 30.61 62.40 224.00 99.00 44.00 143.00 69.23 62.45 225.50 119.00 34.00 153.00 77.78 62.50 227.00 105.00 16.00 121.00 86.78 62.55 228.50 83.00 23.00 106.00 78.30 62.60 230.00 34.00 72.00 106.00 32.08 62.65 230.38 35.00 14.00 49.00 71.43 62.70 230.76 10.00 23.00 33.00 30.30 62.75 231.14 25.00 48.00 73.00 34.25 62.80 231.52 30.00 96.00 126.00 23.81 62.85 231.90 34.00 57.00 91.00 37.36 62.90 232.28 45.00 29.00 74.00 60.81 62.95 232.58 9.00 29.00 38.00 23.68 63.00 232.88 5.00 7.00 12.00 41.67 63.05 233.19 2.00 22.00 24.00 8.33 63.10 233.49 4.00 18.00 22.00 18.18 63.15 233.79 7.00 205.00 212.00 3.30 63.20 234.10 7.00 100.00 107.00 6.54 63.25 234.40 8.00 72.00 80.00 10.00 63.30 234.70 9.00 68.00 77.00 11.69 63.35 235.00 5.00 66.00 71.00 7.04 63.45 235.61 34.00 29.00 63.00 53.97 63.50 235.91 26.00 23.00 49.00 53.06 63.55 236.22 142.00 52.00 194.00 73.20 63.60 236.52 208.00 112.00 320.00 65.00 63.65 236.82 23.00 37.00 60.00 38.33 63.70 237.12 62.00 177.00 239.00 25.94 63.75 237.43 80.00 287.00 367.00 21.80 63.80 237.73 25.00 249.00 274.00 9.12 63.90 238.34 3.00 69.00 72.00 4.17 64.10 239.55 0.00 86.00 86.00 0.00 64.25 240.46 0.00 52.00 52.00 0.00 64.30 240.76 0.00 57.00 57.00 0.00 64.34 241.00 5.00 54.00 78.00 6.40 64.44 242.22 0.00 83.00 83.00 0.00 64.49 242.83 0.00 89.00 89.00 0.00 64.54 243.44 0.00 75.00 75.00 0.00 64.59 244.05 0.00 71.00 71.00 0.00 64.84 247.09 1.00 59.00 60.00 1.67 64.94 248.31 1.00 34.00 35.00 2.86 64.99 248.91 0.00 12.00 12.00 0.00 65.04 249.51 11.00 61.00 72.00 15.28 65.14 250.71 17.00 41.00 58.00 29.31 65.24 252.12 19.00 21.00 40.00 47.50 65.29 252.82 8.00 37.00 45.00 17.78 65.34 253.53 4.00 70.00 74.00 5.41 65.39 254.24 9.00 35.00 44.00 20.45 65.44 254.94 5.00 33.00 38.00 13.16 65.49 255.65 25.00 25.00 50.00 50.00 65.54 256.35 45.00 24.00 69.00 65.22 65.59 257.06 62.00 21.00 83.00 74.70 65.64 257.77 23.00 32.00 55.00 41.82 65.69 258.47 18.00 22.00 40.00 45.00 65.79 259.88 2.00 16.00 18.00 11.11 65.84 260.59 11.00 24.00 35.00 31.43 65.89 261.29 2.00 10.00 12.00 16.67 65.94 262.00 12.00 56.00 68.00 17.65 65.99 262.23 6.00 40.00 46.00 13.04 66.04 262.46 3.00 35.00 38.00 7.89 66.14 262.92 4.00 42.00 46.00 8.70 66.19 263.15 0.00 51.00 51.00 0.00 66.24 263.39 2.00 49.00 51.00 3.92 66.29 263.62 5.00 235.00 240.00 2.08 66.69 265.46 7.00 126.00 133.00 5.26 66.89 266.39 2.00 22.00 24.00 8 66.99 266.85 21.00 33.00 54.00 39 67.09 267.31 35.00 9.00 44.00 80 67.19 267.77 13.00 10.00 23.00 57 67.29 268.23 5.00 34.00 39.00 13 67.44 268.92 6.00 51.00 57.00 11 67.49 269.15 10.00 76.00 86.00 12 68.34 273.08 0.00 6.00 6.00 0.00 68.79 275.15 0.00 12.00 12.00 0.00 69.74 277.99 0.00 0.00 0.00 0.00 70.14 278.74 0.00 6.00 6.00 0.00 70.54 279.56 0.00 4.00 4.00 0.00 70.94 280.88 0.00 4.00 4.00 0.00