# Holocene sedimentary radiogenic nuclide and sortable silt records from the Carolina Slope #----------------------------------------------------------------------- # 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/26330 # Description: NOAA Landing Page # Online_Resource: http://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/hoffmann2018/hoffmann2018-silt.txt # Description: NOAA location of the template # # Data_Type: Paleoceanography # # Dataset_DOI: # # Parameter_Keywords: radiogenic isotope, geochemistry, physical properties #--------------------------------------- # Contribution_Date # Date: 2019-03-05 #--------------------------------------- # File_Last_Modified_Date # Date: 2019-03-05 #--------------------------------------- # Title # Study_Name: Holocene sedimentary radiogenic nuclide and sortable silt records from the Carolina Slope #--------------------------------------- # Investigators # Investigators: Hoffmann, S.S.; McManus, J.F.; Swank, E. #--------------------------------------- # Description_Notes_and_Keywords # Description: # Provided Keywords: Holocene, sediment geochemistry, sediment grain size #--------------------------------------- # Publication # Authors: Hoffmann, S.S., J.F. McManus, and E. Swank # Published_Date_or_Year: 2018 # Published_Title: Evidence for stable Holocene basin-scale overturning circulation despite variable currents along the Deep Western Boundary Current of the North Atlantic Ocean # Journal_Name: Geophysical Research Letters # Volume: 45 # Edition: # Issue: 24 # Pages: 13427-13436 # Report_Number: # DOI: 10.1029/2018GL080187 # Online_Resource: # Full_Citation: # Abstract: While substantial changes in thermohaline circulation related to deglacial climate variability are well established, the role of this circulation in Holocene climate variability remains uncertain. Here we use two dynamical proxies, 231Pa/230Th ratios and mean sortable silt size (SS), to reconstruct Holocene bottom water circulation at the intermediate-depth Carolina Slope. We find no substantial change in deep current speed or 231Pa export at this site during the Holocene, suggesting consistent 231Pa export via the Deep Western Boundary Current. SS shows increasing millennial-scale variability in the middle-late Holocene, which may reflect Labrador Sea Water contribution to current speed. We conclude that deepwater export from the North Atlantic has remained remarkably stable during the Holocene, decoupled from changing rates of specific water masses, while production of these water masses varied at millennial to centennial time scales. The persistence of the large-scale overturning may reflect the ocean's stabilizing influence on Holocene climate. #--------------------------------------- # Funding_Agency # Funding_Agency_Name: National Science Foundation # Grant: AGS 16-35019 #--------------------------------------- # Funding_Agency # Funding_Agency_Name: University of North Carolina Wilmington # Grant: Charles Cahill Award #--------------------------------------- # Funding_Agency # Funding_Agency_Name: Columbia University # Grant: Columbia Science Fellows Program #--------------------------------------- # Site_Information # Site_Name: KN140-2-51 # Location: North Atlantic Ocean # Country: # Northernmost_Latitude: 32.78 # Southernmost_Latitude: 32.78 # Easternmost_Longitude: -76.283 # Westernmost_Longitude: -76.283 # Elevation: -1790 #--------------------------------------- # Data_Collection # Collection_Name: KN140-2-51GGC silt Hoffmann2018 # First_Year: 11190 # Last_Year: 90 # Time_Unit: cal yr BP # Core_Length: 4.29 # Notes: #--------------------------------------- # Chronology_Information # Chronology: # # Labcode sample identification used by 14C laboratory # depth Depth top of sample interval (cm) # species Foraminifera species dated # 14C_age conventional radiocarbon age, years before 1950AD # 14C_age_error radiocarbon age, standard error # calib_age Calibrated age # calib_age_error Calibrated age 1-sigma error # notes Sources for radiocarbon dates # # Labcode depth species 14C_age 14C_age_error calib_age calib_age_error notes # OS-50126 4 Mixed planktonics 615 35 263 50.5 Rasmussen & Thomsen (2012) # OS-125307 9 G. ruber 855 20 485 18.25 this study # OS-50127 100 G. sacculifer 3930 45 3915 69.25 Rasmussen & Thomsen (2012) # OS-50128 210 G. sacculifer 7310 55 7772 60.25 Rasmussen & Thomsen (2012) # OS-95767 222 G. ruber 7980 45 8438 47.5 this study # OS-95853 244 G. ruber 8830 50 9487 47.75 this study # 14761 280 G. ruber 10100 55 11106 72.5 Keigwin (2004) # 14762 290 G. ruber 10200 55 11193 62.5 Keigwin (2004) # #--------------------------------------- # 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,sediment,,centimeter,,paleoceanography,,,N, ## age age,sediment,,calendar kiloyear before present,,paleoceanography,,,N, ## sortable_silt_mean_size sortable silt mean grain size,sediment,,micrometer,,paleoceanography,,,N, ## sortable_silt_mean_size_error sortable silt mean grain size,sediment,one standard error,micrometer,,paleoceanography,,,N, ## sortable_silt_% silt,sediment,,percent,,paleoceanography,,,N, ## sortable_silt_%_error silt,sediment,one standard error,percent,,paleoceanography,,,N, #------------------------ # Data: # Data lines follow (have no #) # Data line format - tab-delimited text, variable short name as header # Missing_Values: -999 depth age sortable_silt_mean_size sortable_silt_mean_size_error sortable_silt_% sortable_silt_%_error 0 0.09 15.83 0.07 35.05 0.15 0 0.09 16.00 0.07 35.70 0.15 0 0.09 16.05 0.07 35.33 0.15 0 0.09 16.15 0.07 35.63 0.15 1 0.13 15.47 0.32 35.00 1.08 1 0.13 16.30 0.32 34.33 1.08 1 0.13 16.66 0.32 39.10 1.08 1 0.13 16.92 0.32 37.07 1.08 2 0.17 14.98 0.23 25.10 2.78 2 0.17 15.45 0.23 30.65 2.78 3 0.22 14.53 0.07 32.65 0.37 3 0.22 14.57 0.07 32.40 0.37 3 0.22 14.77 0.07 33.60 0.37 3 0.22 15.76 0.07 35.10 0.37 3 0.22 15.90 0.07 34.97 0.37 4 0.26 16.37 0.06 36.67 0.18 4 0.26 16.48 0.06 37.03 0.18 5 0.31 15.21 0.28 31.10 1.25 5 0.31 15.73 0.28 32.95 1.25 5 0.31 16.13 0.28 36.30 1.25 5 0.31 16.51 0.28 35.97 1.25 6 0.35 15.76 0.14 31.57 1.40 6 0.35 16.10 0.14 35.33 1.40 6 0.35 16.22 0.14 36.10 1.40 7 0.40 16.27 0.03 34.93 0.45 7 0.40 16.33 0.03 35.83 0.45 8 0.44 15.78 0.10 35.63 0.27 8 0.44 15.97 0.10 35.10 0.27 9 0.49 15.67 0.01 25.80 1.68 9 0.49 15.67 0.01 31.03 1.68 9 0.49 15.71 0.01 26.20 1.68 10 0.52 15.64 0.21 28.60 1.73 10 0.52 16.06 0.21 32.07 1.73 15 0.71 16.46 0.00 41.07 0.07 15 0.71 16.46 0.00 41.20 0.07 20 0.90 16.19 0.11 36.13 1.25 20 0.90 16.41 0.11 38.63 1.25 24 1.05 16.24 0.18 38.30 0.62 24 1.05 16.60 0.18 37.07 0.62 30 1.28 15.59 0.09 29.50 0.30 30 1.28 15.78 0.09 28.90 0.30 35 1.47 15.89 0.15 31.15 1.35 35 1.47 16.19 0.15 33.85 1.35 40 1.65 15.38 0.09 25.10 1.45 40 1.65 15.57 0.09 28.00 1.45 50 2.03 16.00 0.24 34.27 0.97 50 2.03 16.48 0.24 36.20 0.97 60 2.41 15.19 0.15 30.83 0.02 60 2.41 15.48 0.15 30.87 0.02 70 2.78 15.63 0.06 30.45 1.64 70 2.78 15.74 0.06 27.17 1.64 80 3.16 14.79 0.10 23.15 0.56 80 3.16 14.87 0.10 25.07 0.56 80 3.16 15.12 0.10 23.77 0.56 90 3.54 16.01 0.12 32.60 0.82 90 3.54 16.25 0.12 34.23 0.82 100 3.92 15.70 0.08 33.20 0.47 100 3.92 15.86 0.08 34.13 0.47 110 4.27 15.88 0.11 28.55 0.81 110 4.27 16.11 0.11 30.17 0.81 120 4.62 15.74 0.00 34.73 0.58 120 4.62 15.74 0.00 33.57 0.58 130 4.97 15.08 0.17 28.93 0.94 130 4.97 15.39 0.17 31.13 0.94 130 4.97 15.64 0.17 31.70 0.94 130 4.97 15.85 0.17 33.50 0.94 140 5.32 15.08 0.06 28.93 0.94 140 5.32 15.18 0.06 32.15 0.94 140 5.32 15.29 0.06 30.95 0.94 150 5.67 15.86 0.05 36.00 1.12 150 5.67 15.97 0.05 33.77 1.12 161 6.05 15.86 0.15 35.03 0.23 161 6.05 16.17 0.15 35.50 0.23 170 6.37 15.27 0.11 31.60 1.01 170 6.37 15.30 0.11 28.25 1.01 170 6.37 15.62 0.11 29.10 1.01 181 6.76 15.27 0.14 30.25 1.51 181 6.76 15.55 0.14 33.27 1.51 190 7.07 15.42 0.07 31.93 0.28 190 7.07 15.56 0.07 32.50 0.28 200 7.42 15.15 0.07 31.75 0.88 200 7.42 15.29 0.07 33.50 0.88 206 7.63 15.68 0.02 31.90 1.11 206 7.63 15.70 0.02 34.43 1.11 206 7.63 15.76 0.02 35.67 1.11 210 7.77 15.08 0.20 26.97 0.95 210 7.77 15.14 0.20 28.60 0.95 210 7.77 15.69 0.20 30.27 0.95 211 7.83 15.54 0.15 31.93 1.89 211 7.83 15.67 0.15 32.85 1.89 211 7.83 16.05 0.15 38.00 1.89 212 7.88 16.06 0.03 29.70 0.55 212 7.88 16.12 0.03 30.80 0.55 213 7.94 15.67 0.00 34.30 1.05 213 7.94 15.67 0.00 32.20 1.05 214 7.99 15.45 0.06 28.90 0.23 214 7.99 15.56 0.06 28.45 0.23 215 8.05 15.55 0.18 32.73 0.63 215 8.05 15.92 0.18 34.00 0.63 216 8.13 15.20 0.00 29.93 0.17 216 8.13 15.20 0.00 30.27 0.17 216.75 8.15 15.57 0.01 32.73 0.12 216.75 8.15 15.60 0.01 32.50 0.12 217.25 8.17 15.37 0.09 31.60 0.71 217.25 8.17 15.44 0.09 32.75 0.71 217.5 8.19 15.04 0.14 29.57 1.40 217.5 8.19 15.32 0.14 32.37 1.40 217.75 8.20 15.42 0.11 33.35 0.26 217.75 8.20 15.57 0.11 32.75 0.26 217.75 8.20 15.79 0.11 33.63 0.26 218.25 8.23 14.80 0.01 28.95 1.34 218.25 8.23 15.54 0.01 30.25 1.34 218.25 8.23 15.55 0.01 31.85 1.34 218.25 8.23 15.68 0.01 32.33 1.34 218.5 8.24 14.54 0.25 28.00 0.84 218.5 8.24 14.56 0.25 26.10 0.84 218.5 8.24 14.59 0.25 28.75 0.84 218.5 8.24 14.60 0.25 32.50 0.84 218.75 8.26 15.12 0.11 23.77 1.74 218.75 8.26 15.44 0.11 33.03 1.74 218.75 8.26 15.62 0.11 32.20 1.74 218.75 8.26 15.72 0.11 32.30 1.74 218.75 8.26 15.72 0.11 32.30 1.74 219.25 8.29 14.99 0.12 30.75 1.65 219.25 8.29 15.30 0.12 29.73 1.65 219.25 8.29 15.47 0.12 32.35 1.65 219.5 8.30 15.21 0.14 29.20 0.76 219.5 8.30 15.45 0.14 32.50 0.76 219.75 8.31 15.55 0.13 32.07 1.20 219.75 8.31 15.82 0.13 34.47 1.20 220 8.33 15.03 0.13 28.45 1.00 220 8.33 15.30 0.13 30.45 1.00 221.5 8.41 15.22 0.04 32.30 1.13 221.5 8.41 15.35 0.04 37.00 1.13 221.5 8.41 15.37 0.04 34.17 1.13 221.5 8.41 15.43 0.04 36.80 1.13 225 8.58 15.34 0.07 32.80 0.62 225 8.58 15.48 0.07 31.57 0.62 226 8.63 15.20 0.12 29.47 0.48 226 8.63 15.44 0.12 30.43 0.48 228 8.72 15.57 0.32 32.10 1.58 228 8.72 15.88 0.32 35.13 1.58 232 8.91 15.78 0.05 32.67 0.19 232 8.91 15.87 0.05 33.05 0.19 238 9.20 15.37 0.14 24.40 1.65 238 9.20 15.65 0.14 27.70 1.65 246 9.58 15.68 0.17 31.00 1.65 246 9.58 16.02 0.17 34.30 1.65 250 9.76 15.68 0.23 28.80 0.86 250 9.76 15.91 0.23 31.07 0.86 250 9.76 16.45 0.23 31.60 0.86 252 9.85 15.06 0.20 29.00 1.48 252 9.85 15.46 0.20 31.97 1.48 254 9.94 15.26 0.18 29.67 0.49 254 9.94 15.62 0.18 30.65 0.49 260 10.21 16.00 0.12 30.47 1.55 260 10.21 16.04 0.12 32.30 1.55 260 10.21 15.44 0.12 28.70 1.55 264 10.39 15.37 0.22 28.20 1.64 264 10.39 15.67 0.22 27.00 1.64 264 10.39 16.12 0.22 32.40 1.64 270 10.66 15.62 0.16 28.80 0.05 270 10.66 15.94 0.16 28.90 0.05 276 10.93 15.53 0.12 28.80 1.00 276 10.93 15.87 0.12 32.03 1.00 276 10.93 15.90 0.12 31.50 1.00 280 11.11 16.16 0.21 32.53 0.67 280 11.11 16.63 0.21 34.50 0.67 280 11.11 16.87 0.21 34.60 0.67 290 11.19 15.44 0.14 26.50 0.08 290 11.19 15.72 0.14 26.65 0.08