# Niger Delta Mg/Ca Data over the Last 21 Kyr #----------------------------------------------------------------------- # World Data Service for Paleoclimatology, Boulder # and # NOAA Paleoclimatology Program #----------------------------------------------------------------------- # 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/23112 # Description: NOAA Landing Page # Online_Resource: http://www1.ncdc.noaa.gov/pub/data/paleo/paleocean/by_contributor/schmidt2017/schmidt2017-fan17.txt # Description: NOAA location of the template # # Archive: Paleoceanography # # Dataset_DOI: # # Parameter_Keywords: geochemistry, trace metals in carbonates #--------------------------------------- # Contribution_Date # Date: 2017-11-22 #--------------------------------------- # File_Last_Modified_Date # Date: 2017-11-22 #--------------------------------------- # Title # Study_Name: Niger Delta Mg/Ca Data over the Last 21 Kyr #--------------------------------------- # Investigators # Investigators: Schmidt, Matthew W.; Chang, Ping; Parker, Andrew O.; Ji, Link; He, Feng #--------------------------------------- # Description_Notes_and_Keywords # Description: # Provided Keywords: Deglaciation, abrupt climate change, West African Monsoon, Mg/Ca temperature, subsurface temperature, Niger delta, Younger Dryas, Heinrich Event 1, LGM, GCM modelling, Globorotalia crassaformis #--------------------------------------- # Publication # Authors: Schmidt, Matthew W., Ping Chang, Andrew O. Parker, Link Ji and Feng He # Published_Date_or_Year: 2017 # Published_Title: Deglacial Tropical Atlantic subsurface warming links ocean circulation variability to the West African Monsoon # Journal_Name: Scientific Reports # Volume: 7 # Edition: # Issue: 15390 # Pages: 1- 11 # Report Number: # DOI: 10.1038/s41598-017-15637-6 # Online_Resource: # Full_Citation: # Abstract: Multiple lines of evidence show that cold stadials in the North Atlantic were accompanied by both reductions in Atlantic Meridional Overturning Circulation (AMOC) and collapses of the West African Monsoon (WAM). Although records of terrestrial change identify abrupt WAM variability across the deglaciation, few studies show how ocean temperatures evolved across the deglaciation. To identify the mechanism linking AMOC to the WAM, we generated a new record of subsurface temperature variability over the last 21 kyr based on Mg/Ca ratios in a sub-thermocline dwelling planktonic foraminifera in an Eastern Equatorial Atlantic (EEA) sediment core from the Niger Delta. Our subsurface temperature record shows abrupt subsurface warming during both the Younger Dryas (YD) and Heinrich Event 1. We also conducted a new transient coupled ocean-atmosphere model simulation across the YD that better resolves the western boundary current dynamics and find a strong negative correlation between AMOC strength and EEA subsurface temperatures caused by changes in ocean circulation and rainfall responses that are consistent with the observed WAM change. Our combined proxy and modeling results provide the first evidence that an oceanic teleconnection between AMOC strength and subsurface temperature in the EEA impacted the intensity of the WAM on millennial time scales. #--------------------------------------- # Funding_Agency # Funding_Agency_Name: National Science Foundation # Grant: OCE-1102743 #--------------------------------------- # Site Information # Site_Name: Fan 17, Niger Delta # Location: Gulf of Guinea # Country: # Northernmost_Latitude: 4.81 # Southernmost_Latitude: 4.81 # Easternmost_Longitude: 4.45 # Westernmost_Longitude: 4.45 # Elevation: -1178 #--------------------------------------- # Data_Collection # Collection_Name: Fan17 Mg/Ca Schmidt2017 # First_Year: 20910 # Last_Year: 550 # Time_Unit: cal yr BP # Core_Length: 3.45 # Notes: #--------------------------------------- # Chronology_Information # Chronology: #--------------------------------------- # 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_cm depth,,,cm,,,,,N, ## age_calkaBP age,,,cal kiloyears before present,,,,,N, ## Mg/Ca Magnesium/Calcium,Globorotalia crassaformis,,mmol/mol,,paleoceanography,,,N, ## Mg/Ca_1s Magnesium/Calcium,Globorotalia crassaformis,one standard deviation,mmol/mol,,paleoceanography,,,N, ## numanaly number of analyses,,,,,paleoceanography,,,N, #------------------------ # Data # Data lines follow (have no #) # Data line format - tab-delimited text, variable short name as header # Missing Value: NaN depth_cm age_calkaBP Mg/Ca Mg/Ca_1s numanaly 29 2.23 1.44 0.1 3 31 2.35 NaN NaN NaN 33 2.47 1.17 0.03 2 35 2.59 NaN NaN NaN 37 2.71 NaN NaN NaN 39 2.83 1.473 NaN 1 41 2.95 NaN NaN NaN 43 3.07 1.28 NaN 1 45 3.19 NaN NaN NaN 47 3.31 NaN NaN NaN 49 3.43 NaN NaN NaN 51 3.55 NaN NaN NaN 53 3.67 NaN NaN NaN 55 3.8 1.3 0.07 2 57 3.92 NaN NaN NaN 59 4.04 1.66 NaN 1 61 4.16 NaN NaN NaN 63 4.28 1.27 0.02 2 65 4.4 NaN NaN NaN 67 4.52 1.1 0.04 2 69 4.64 NaN NaN NaN 71 4.76 1.25 0.04 2 73 4.88 NaN NaN NaN 75 5 1.22 0.17 2 77 5.12 NaN NaN NaN 79 5.24 1.28 0.11 2 81 5.36 NaN NaN NaN 83 5.48 1.12 0.13 2 85 5.6 NaN NaN NaN 87 5.72 0.99 0.02 2 89 5.84 NaN NaN NaN 91 5.96 1.01 0.12 2 93 6.08 NaN NaN NaN 95 6.2 1.17 NaN 1 97 6.32 NaN NaN NaN 99 6.44 1.08 NaN 1 101 6.56 NaN NaN NaN 103 6.68 NaN NaN NaN 105 6.8 NaN NaN NaN 107 6.92 1.31 0.05 2 109 7.01 NaN NaN NaN 111 7.11 1.36 0.01 2 113 7.2 NaN NaN NaN 115 7.3 1.279 NaN 1 117 7.39 NaN NaN NaN 119 7.49 1.26 0.11 2 121 7.58 1.3 0.06 2 123 7.68 NaN NaN NaN 125 7.77 1.46 NaN 1 127 7.87 1.21 NaN 1 129 7.96 1.51 NaN 1 131 8.06 NaN NaN NaN 133 8.15 1.33 NaN 1 135 8.25 NaN NaN NaN 137 8.34 1.4 NaN 1 139 8.44 NaN NaN NaN 141 8.53 1.43 NaN 1 143 8.62 NaN NaN NaN 145 8.72 1.41 NaN 1 147 8.81 NaN NaN NaN 149 8.91 1.29 NaN 1 151 9 NaN NaN NaN 153 9.1 NaN NaN NaN 155 9.19 NaN NaN NaN 157 9.29 1.35 0.03 2 159 9.38 NaN NaN NaN 161 9.48 1.4 0.03 2 163 9.57 1.2 0.04 2 165 9.67 1.2 NaN 1 167 9.76 1.41 NaN 1 169 9.86 NaN NaN NaN 171 9.95 1.53 NaN 1 173 10.05 NaN NaN NaN 175 10.14 1.501 NaN 1 177 10.22 NaN NaN NaN 179 10.3 1.23 NaN 1 181 10.38 NaN NaN NaN 183 10.46 1.21 0.09 2 185 10.54 1.37 0.06 2 187 10.62 NaN NaN NaN 189 10.71 NaN NaN NaN 191 10.79 1.24 NaN 1 193 10.87 NaN NaN NaN 195 10.95 NaN NaN NaN 197 11.03 NaN NaN NaN 199 11.11 1.38 0.13 2 203 11.28 NaN NaN NaN 205 11.35 1.41 0.07 2 207 11.43 1.27 0.05 2 209 11.51 1.5 0.06 2 211 11.68 1.45 0.04 2 213 11.84 1.37 0.09 2 215 11.92 1.3 NaN 1 217 12 1.32 0.05 3 219 12.08 1.26 0.07 2 221 12.24 1.34 0.08 2 223 12.32 1.26 0.09 3 225 12.4 1.345 NaN 1 227 12.48 1.3 0.06 2 229 12.56 1.268 NaN 1 231 12.64 1.065 NaN 1 233 12.73 1.32 0.1 3 235 12.81 1.21 0.09 2 237 12.89 1.57 0.01 2 239 12.97 1.29 0.12 1 241 13.05 1.03 0.16 1 243 13.21 1.14 0.11 2 245 13.55 1.03 0.07 2 247 13.88 1.016 NaN 1 249 14.22 1.02 0.08 2 251 14.55 1.317 0.08 2 253 14.89 1.5 0.12 2 255 15.22 1.1 0.01 2 257 15.56 1.3515 0.00 2 259 15.69 1.217 0.07 2 261 15.81 1.19 0.07 3 263 16.2 1.16 0.05 2 265 16.32 1.01 0.08 2 267 16.45 1.02 0.03 2 269 16.58 0.96 0.13 2 271 16.71 1.1 0.06 2 273 16.83 1.14 0.06 2 275 16.96 1.13 0.04 2 277 17.09 1.04 0.06 2 279 17.21 1.03 0.01 2 281 17.34 0.88 0.02 2 283 17.47 0.91 0.03 2 285 17.6 0.89 0.1 2 287 17.85 1.01 0.02 2 289 18.03 1.07 0.02 2 291 18.21 1.12 0.09 2 293 18.39 1.0 0.03 2 295 18.57 1.06 0.03 2 297 18.75 1.01 0.09 2 299 18.93 0.85 0.06 2 301 19.11 1.16 0.02 2 303 19.29 0.94 0.09 2 305 19.47 0.94 0.02 2 307 19.65 1.06 0.02 2 309 20.01 0.85 0.03 2 311 20.19 1.02 0.02 2 313 20.37 0.88 0.02 2 315 20.55 1.15 0.01 2 317 20.73 1.15 0.12 2