# 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-crass.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: VM12-107Schmidt2012crass # First_Year: 22000 # Last_Year: 0 # Time_Unit: calYrBP # Core_Length: 2.705 # 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 # # End Description/Documentation (lines begin with #) # Data lines follow (have no #) # Data line variables format: Variables list, one per line, shortname-tab-longname-tab-longname components (9 components: material, error, units, anomaly, period, archive, detail, method, C or N for Character or Numeric data) # Data line format: tab-delimited text, variable short name as header # Table S2. VM12-107 G. crassaformis stable oxygen isotope and Mg/Ca data ## depth_cm Depth (cm), , , cm, , , , , N ## d18Og.crass delta O18,Globorotalia crassaformis, , per mil VPDB, , , , , N ## Mg/Ca-g.crass Magnesium/Calcium, Globorotalia crassaformis, , , mmol/mol, , , , , N ## numspecim Number of specimens, , , , , , , , N ## Mg/Ca-g.crass-stdev Magnesium/Calcium,Globorotalia crassaformis,Std Dev,mmol/mol , , , , ,N #------------------------ # Data: # Missing Value: nan depth_cm d18Og.crass Mg/Ca-g.crass numspecim Mg/Ca-g.crass-stdev 0.5 1.8 nan nan nan 9.5 1.76 nan nan nan 21.5 1.49 nan nan nan 31.5 1.72 nan nan nan 42.5 nan nan nan nan 44.5 1.94 0.83 1 nan 48.5 1.09 nan nan nan 52.5 nan 0.891 1 nan 60.5 1.61 0.942 1 nan 62.5 nan 1.126 1 nan 64.5 1.73 nan nan nan 66.5 1.42 1.096 2 0.042 68.5 1.31 nan nan nan 70.5 1.28 nan nan nan 72.5 1.5 nan nan nan 76.5 1.55 nan nan nan 80.5 1.86 1.238 1 nan 82.5 nan 1.024 2 0.054 84.5 1.77 1.153 3 0.051 86.5 nan 1.246 4 0.058 88.5 2.04 nan nan nan 90.5 nan 1.053 4 0.057 92.5 2.05 1.096 2 0.028 94.5 2.21 1.27 1 nan 96.5 2.09 1.272 3 0.031 98.5 nan 1.217 2 0.009 98.5 2.05 nan nan nan 101.5 1.93 nan nan nan 102.5 1.85 nan nan nan 104.5 1.69 nan nan nan 106.5 2.26 1.294 1 nan 108.5 nan 1.374 4 0.052 108.5 1.99 nan nan nan 110.5 2.02 nan nan nan 112.5 2.22 1.297 2 0.059 114.5 2.15 nan nan nan 116.5 2.35 1.417 2 0.005 118.5 1.96 1.377 1 nan 120.5 2.14 1.396 2 0.064 122.5 2.04 nan nan nan 124.5 1.28 1.584 1 nan 126.5 nan 1.544 2 0.104 128.5 1.71 nan nan nan 130.5 1.8 1.581 2 0.092 132.5 2.06 1.466 2 0.019 134.5 2.21 1.439 2 0.087 136.5 1.59 1.632 2 0.058 138.5 2.09 1.282 1 nan 140.5 1.88 1.307 2 0.013 142.5 2.28 1.384 2 0.045 144.5 2.51 nan nan nan 148.5 2.39 1.254 1 nan 151.5 2.33 1.358 2 0.032 152.5 1.88 nan nan nan 154.5 2.13 1.383 1 nan 158.5 2.75 nan nan nan 160.5 2.04 1.5 2 0.035 164.5 2.16 1.453 1 nan 166.5 nan 1.46 2 0.028 166.5 2.39 nan nan nan 168.5 nan 1.428 1 nan 170.5 nan 1.419 1 nan 172.5 2.43 1.429 1 nan 178.5 2.67 1.44 2 0.114 180.5 2.39 1.387 2 0.033 182.5 2.43 1.428 1 nan 184.5 nan 1.304 1 nan 188.5 2.5 1.243 2 0.011 192.5 2.58 nan nan nan 196.5 2.54 1.307 1 nan 198.5 2.28 nan nan nan 200.5 2.88 1.229 1 nan 204.5 2.78 nan nan nan 206.5 nan 1.286 2 0.087 208.5 3.01 1.256 2 0 210.5 3.09 1.187 2 0.001 212.5 3.02 nan nan nan 214.5 3.11 1.257 2 0.038 216.5 2.67 nan nan nan 218.5 2.98 1.102 2 0.023 220.5 nan 1.152 2 0.013 220.5 3.28 nan nan nan 222.5 2.66 1.069 1 nan 224.5 2.75 nan nan nan 226.5 2.67 1.16 2 0.041 228.5 2.84 1.105 2 0.069 230.5 2.6 nan nan nan 232.5 2.72 nan nan nan 234.5 nan 1.093 4 0.043 236.5 2.71 nan nan nan 238.5 2.98 nan nan nan 240.5 2.77 1.205 4 0.044 243.5 nan 1.217 2 0.038 246.5 2.98 nan nan nan 248.5 2.66 1.226 2 0.035 251.5 2.77 nan nan nan 252.5 3.12 1.277 2 0.001 254.5 2.59 1.115 2 0.006 256.5 2.69 nan nan nan 258.5 2.93 nan nan nan 260.5 3.16 1.229 2 0.056 262.5 2.93 nan nan nan 264.5 2.92 nan nan nan 266.5 2.99 nan nan nan 268.5 2.81 nan nan nan 270.5 2.57 nan nan nan