# Bonaire Basin VM12-107 22000 Year d18O and Mg/Ca Data #----------------------------------------------------------------------- # World Data Center for Paleoclimatology, Boulder # and # NOAA Paleoclimatology Program #----------------------------------------------------------------------- # NOTE: Please cite original reference when using these data, # plus the Online Resource and date accessed. # # # Online_Resource: https://www.ncdc.noaa.gov/paleo/study/13609 # # Online_Resource: http://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/schmidt2012b/schmidt2012b-ruber.txt # # Description/Documentation lines begin with # # Data lines have no # # # Archive: Paleoceanography #-------------------- # Contribution_Date # Date: 2012-12-12 #-------------------- # Title # Study_Name: Bonaire Basin VM12-107 22000 Year d18O and Mg/Ca Data #-------------------- # Investigators # Investigators: Schmidt, M.W.; Chang, P.; Hertzberg, J.E.; Them, T.R. II, Ji, L.; Otto-Bliesner, B.L. #-------------------- # Description_and_Notes # # High-resolution oxygen isotope data and Mg/Ca ratios in both surface- and subthermocline-dwelling # planktonic foraminifera (G. ruber and G. crassaformis) from a sediment core located in the Bonaire Basin, # southern Caribbean Sea, for the last 22 kyr. # #-------------------- # Publication # Authors: Matthew W. Schmidt, Ping Chang, Jennifer E. Hertzberg, Theodore R. Them II, Link Ji, and Bette L. Otto-Bliesner # Published_Date_or_YEAR: 2012-09-04 # Published_Title: Impact of abrupt deglacial climate change on tropical Atlantic subsurface temperatures # Journal_Name: Proceedings of the National Academy of Sciences of the United States of America (PNAS) # Volume: 109 # Issue: 36 # Pages: 14348 - 14352 # DOI: 10.1073/pnas.1207806109 # Abstract: Both instrumental data analyses and coupled ocean-atmosphere models indicate that Atlantic meridional overturning circulation (AMOC) variability is tightly linked to abrupt tropical North Atlantic (TNA) climate change through both atmospheric and oceanic processes. Although a slowdown of AMOC results in an atmospheric-induced surface cooling in the entire TNA, the subsurface experiences an even larger warming because of rapid reorganizations of ocean circulation patterns at intermediate water depths. Here, we reconstruct high-resolution temperature records using oxygen isotope values and Mg/Ca ratios in both surface- and subthermocline-dwelling planktonic foraminifera from a sediment core located in the TNA over the last 22 ky. Our results show significant changes in the vertical thermal gradient of the upper water column, with the warmest subsurface temperatures of the last deglacial transition corresponding to the onset of the Younger Dryas. Furthermore, we present new analyses of a climate model simulation forced with freshwater discharge into the North Atlantic under Last Glacial Maximum forcings and boundary conditions that reveal a maximum subsurface warming in the vicinity of the core site and a vertical thermal gradient change at the onset of AMOC weakening, consistent with the reconstructed record. Together, our proxy reconstructions and modeling results provide convincing evidence for a subsurface oceanic teleconnection linking high-latitude North Atlantic climate to the tropical Atlantic during periods of reduced AMOC across the last deglacial transition. # #--------------------- # Funding_Agency # Funding_Agency_Name: US National Science Foundation # Grant: OCE-1102743 #--------------------- # Funding_Agency # Funding_Agency_Name: US National Oceanic and Atmospheric Administration # Grant: NA11OAR4310154 #--------------------- # Funding_Agency # Funding_Agency_Name: National Science Foundation of China # Grant: 41028005, 40921004, 40930844 #--------------------- # Funding_Agency # Funding_Agency_Name: Chinese Ministry of Education # Grant: 111 project Grant B07036 #--------------------- # Site_Information # Site_Name: VM12-107 # Location: Ocean>Atlantic Ocean>North Atlantic Ocean>Caribbean Sea # Country: # Northernmost_Latitude: 11.33 # Southernmost_Latitude: 11.33 # Easternmost_Longitude: -66.63 # Westernmost_Longitude: -66.63 # Elevation: -1079 m #------------------ # Data_Collection # Core_Name: VM12-107Schmidt2012ruber # First_Year: 22000 # Last_Year: 0 # Time_Unit: calYrBP # Core_Length: 2.605 # Notes: #------------------ # Chronology # # Depth (cm) 14C Age Age Error(yr) Calendar Age (ky BP) Calendar Age Error (-) Calendar Age Error (+) (ky) # 2.5 1140 35 0.69 0.05 0.07 # 70.5 7900 55 8.37 0.13 0.13 # 82.5 9380 40 10.22 0.07 0.12 # 90.5 10050 65 11.05 0.26 0.14 # 104.5 10400 50 11.46 0.22 0.23 # 130.5 11200 50 12.67 0.1 0.16 # 160.5 12750 50 14.37 0.35 0.52 # 180.5 13450 60 15.74 0.56 0.64 # 220.5 15600 60 18.47 0.42 0.18 # 270.5 18500 90 21.59 0.26 0.47 # # Radiocarbon dates from VM12-107 based on mixed samples of G. sacculifer and G. ruber specimens. # Radiocarbon ages were converted to calendar ages using CALIB 6.0 using the standard 400 year reservoir age correction. # # #------------------ # Variables # # Data line variables format: Variables list, 9 components: what,material, error, units, seasonality, archive, detail, method, C or N for Character or Numeric data) ## depth_cm depth, , , cm, , , , , N ## d18Ovg.rub-w250-355 delta 18O, Globigerinoides ruber white, , , per mil VPDB, , ,250-355 micron, , N ## Mg/Ca-g.rub-w Magnesium/Calcium,Globigerinoides ruber white, , , mmol/mol, , , , , N ## numspecim Number of specimens, , , , , , , , N ## Mg/Ca-g.rub-w-stdev Magnesium/Calcium, Globigerinoides ruber white,Std Dev, ,mmol/mol , , , ,250-355 micron , , N #------------------------ # Data: # Missing Value: nan depth_cm d18Ovg.rub-w250-355 Mg/Ca-g.rub-w numspecim Mg/Ca-g.rub-w-stdev 0.5 -1.97 3.83 3 0.067 2.5 nan 3.73 1 nan 4.5 nan 3.687 1 nan 6.5 nan 3.526 2 0.039 8.5 nan 3.793 2 0.107 9.5 -2.1 3.65 2 0.012 14.5 nan 3.753 2 0.003 16.5 nan 3.678 2 0.002 18.5 nan 3.783 2 0.033 21.5 -1.86 3.904 2 0.034 22.5 nan 3.81 2 0.123 26.5 nan 3.561 2 0.103 28.5 nan 3.757 2 0.083 31.5 -1.86 3.514 2 0.078 32.5 nan 3.469 2 0.033 34.5 nan 3.456 1 nan 38.5 nan 3.828 2 0.053 41.5 -1.82 3.544 2 0.063 42.5 nan 3.67 2 0.054 44.5 nan 3.247 2 0.032 46.5 nan 3.32 2 0.008 48.5 nan 3.4 2 0.003 51.5 -1.73 nan nan nan 52.5 nan 3.444 2 0.041 56.5 nan 3.485 1 nan 58.5 nan 3.344 1 nan 60.5 -1.7 3.562 2 0.007 62.5 nan 3.704 2 0.048 64.5 nan 3.64 2 0.009 68.5 nan 3.655 2 0.035 70.5 -1.24 3.617 2 0.011 72.5 nan 3.816 2 0.13 78.5 nan 3.391 2 0.001 80.5 -0.9 nan nan nan 82.5 -1.01 3.383 2 0.077 84.5 -0.86 3.329 2 0.038 86.5 -0.78 3.466 2 0.08 88.5 -1.3 3.376 2 0.067 90.5 -1.16 3.1 2 0.026 92.5 -0.97 3.294 2 0.032 94.5 -0.62 3.336 2 0.06 96.5 -1.21 nan nan nan 98.5 -0.54 3.26 2 0.088 101.5 -0.63 2.999 2 0.1 102.5 -0.15 3.221 3 0.044 104.5 -0.3 2.934 3 0.05 106.5 -0.75 3.129 3 0.045 108.5 -0.32 2.99 3 0.035 110.5 -0.53 nan nan nan 112.5 -0.7 3.207 2 0.126 114.5 -0.6 3.002 2 0.118 116.5 -0.69 nan nan nan 118.5 -0.37 nan nan nan 120.5 -0.43 3.069 2 0.062 122.5 -0.75 nan nan nan 124.5 -0.71 3.722 2 0.06 126.5 -0.61 3.717 2 0.06 128.5 -0.54 3.435 2 0.055 130.5 -0.38 3.568 2 0.081 132.5 -0.29 3.242 2 0.052 134.5 -0.55 3.417 2 0.055 136.5 -0.45 3.541 2 0.088 138.5 -0.62 nan nan nan 140.5 -0.49 3.295 2 0.057 142.5 -0.43 3.333 2 0.084 144.5 -0.4 3.415 2 0.055 146.5 -0.16 3.15 1 nan 148.5 0.08 2.91 1 nan 150 nan 3.101 1 nan 151.5 -0.12 3.07 1 nan 152.5 0.24 3.165 1 nan 154.5 0.23 2.845 2 0.067 156.5 -0.25 2.913 1 nan 158.5 -0.17 nan nan nan 160.5 0.01 3.191 2 0.072 162.5 0.01 3.124 2 0.08 164.5 -0.04 3.088 2 0.121 166.5 0.08 3.147 1 nan 168.5 0.19 2.983 1 nan 170.5 -0.07 nan nan nan 172.5 0.38 nan nan nan 174.5 0.54 2.748 2 0.036 176.5 0.43 2.949 1 nan 178.5 0.26 nan nan nan 180.5 0.13 2.91 2 0.095 182.5 0.57 2.571 2 0.013 184.5 0.58 2.446 2 0.067 186.5 0.6 2.609 2 0.078 188.5 0.54 2.782 2 0.066 190.5 0.44 2.804 2 0.124 192.5 0.54 2.658 2 0.04 194.5 0.59 2.699 2 0.029 196.5 0.38 2.74 2 0.042 198.5 0.06 nan nan nan 200.5 0.3 2.593 2 0.021 202.5 0.84 2.69 1 nan 204.5 0.55 2.745 1 nan 206.5 0.45 2.532 2 0.086 208.5 0.49 2.575 2 0.001 210.5 0.38 nan nan nan 212.5 0.35 2.59 2 0.06 214.5 0.19 2.429 2 0.023 216.5 0.31 nan nan nan 220.5 0.39 nan nan nan 222.5 0.61 nan nan nan 224.5 0.29 nan nan nan 226.5 0.7 nan nan nan 228.5 0.72 nan nan nan 230.5 0.37 2.404 2 0.024 232.5 0.56 nan nan nan 234.5 0.51 nan nan nan 236.5 0.49 nan nan nan 238.5 0.72 nan nan nan 240.5 0.48 2.527 2 0.053 242.5 0.84 nan nan nan 248.5 0.75 nan nan nan 251.5 0.55 2.776 2 0.141 260.5 0.48 nan nan nan