# Eastern equatorial Atlantic trace metal, oxygen and carbon isotope data and bottom water temperature between 10 and 21 kyr BP #----------------------------------------------------------------------- # 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/22276 # Description: NOAA Landing Page # Online_Resource: https://www1.ncdc.noaa.gov/pub/data/paleo/paleocean/by_contributor/weldeab2016-poc/weldeab2016-poc-bwt.txt # Description: NOAA location of the template # # Archive: Paleoceanography # # Parameter_Keywords: carbon isotopes, oxygen isotopes, trace metals in carbonates, radiogenic isotopes, reconstruction #--------------------------------------- # Contribution_Date # Date: 2017-06-27 #--------------------------------------- # File_Last_Modified_Date # Date: 2017-06-27 #--------------------------------------- # Title # Study_Name: Eastern equatorial Atlantic trace metal, oxygen and carbon isotope data and bottom water temperature between 10 and 21 kyr BP #--------------------------------------- # Investigators # Investigators: Weldeab, S.; Friedrich, T.; Timmermann, A.; Schneider, R. R. #--------------------------------------- # Description_Notes_and_Keywords # Description: # Provided Keywords: benthic foraminiferal trace metals, radio carbon, isotope record, last deglacial, Younger Dyras, Heinrich events 1, lat glacila maximum #--------------------------------------- # Publication # Authors: Weldeab, S., T. Friedrich, A. Timmermann, and R.R. Schneider # Published_Date_or_Year: 2016 # Published_Title: Strong mid-depth warming and weak radiocarbon imprints in the equatorial Atlantic during Heinrich 1 and Younger Dryas # Journal_Name: Paleoceanography # Volume: 31 # Edition: # Issue: # Pages: 1070-1083 # Report Number: # DOI: 10.1002/2016PA002957 # Online_Resource: # Full_Citation: # Abstract: We present a benthic foraminiferal multiproxy record of eastern equatorial Atlantic (EEA) middepth water (1295?m) covering the last deglacial. We show that EEA middepth water temperatures were elevated by 3.9?±?0.5°C and 5.2?±?1.2°C during Heinrich event 1 (H1) and Younger Dryas (YD), respectively. The radiocarbon content of the EEA middepth during H1 and YD is relatively low and comparable to the values of the pre-H1 episode and Bølling-Allerød, respectively. A transient Earth system model simulation, which mimics the observed deglacial Atlantic Meridional Overturning Circulation (AMOC) history, qualitatively reproduces the major features of the EEA proxy records. The simulation results suggest that fresh water-induced weakening of the AMOC leads to a vertical shift of the horizon of Southern Ocean-sourced water and a stronger influence of EEA sea surface temperatures via mixing. Our findings reaffirm the lack of a distinctive signature of radiocarbon depletion and therefore do not support the notion of interhemispheric exchanges of strongly radiocarbon-depleted middepth water across the tropical Atlantic during H1 and YD. Our temperature reconstruction presents a critical zonal and water depth extension of existing tropical Atlantic data and documents a large-scale and basin-wide warming across the thermocline and middepth of the tropical Atlantic during H1 and YD. Significant difference in the timing and pace of H1 middepth warming between tropical Atlantic and North Atlantic likely points to a limited role of the tropical Atlantic middepth warming in the rapid heat buildup in the North Atlantic middepth. #--------------------------------------- # Funding_Agency # Funding_Agency_Name: National Science Foundation # Grant: OCE 1260690 #--------------------------------------- # Site Information # Site_Name: MD03-2707 # Location: Eastern Equatorial Atlantic, Gulf of Guinea # Country: # Northernmost_Latitude: 2.502 # Southernmost_Latitude: 2.502 # Easternmost_Longitude: 9.395 # Westernmost_Longitude: 9.395 # Elevation: -1295 #--------------------------------------- # Data_Collection # Collection_Name: MD03-2707 BWT Weldeab16-poc # First_Year: 20605 # Last_Year: 10066 # Time_Unit: cal yr BP # Core_Length: # Notes: Calypso giant piston core: MD2707 #--------------------------------------- # Chronology_Information # Chronology: # # Labcode sample identification used by 14C laboratory # depth_top Depth top of sample interval (cm) # depth_bottom Depth bottom of sample interval (cm) # mat.dated Material Dated # 14C.raw conventional radiocarbon age, years before 1950AD # 14C.raw_err radiocarbon age, standard error # datemeth Dating method # reservoir Reservoir correction # calib.14C Calibrated age # calib.14C_2sig_lo Calibrated age, 2-sigma lower confidence bound # calib.14C_2sig_up Calibrated age, 2-sigma upper confidence bound # calib_method Calibration method # # Lab code depth_top (cm) depth_bottom (cm) mat.dated 14C.raw 14C.raw_err datemeth reservoir calib.14C calib.14C_2sig_lo calib.14C_2sig_up calib_method # KIA 31020 497 498 G. ruber pink 9170 45 14C AMS Marine13 9984.5 10190.2 9704 Calb 7.0/Bacon (Blaauw and Christen, 2011) # KIA 36787 537 538 G. ruber pink 9780 45 14C AMS Marine13 10794.9 10984 10638.4 Calb 7.0/Bacon (Blaauw and Christen, 2011) # KIA 31021 541 542 G. ruber pink 9950 50 14C AMS Marine13 10869.3 11067 10700.3 Calb 7.0/Bacon (Blaauw and Christen, 2011) # KIA 31022 558 559 G. ruber pink 10125 45 14C AMS Marine13 11235.8 11627 11045.9 Calb 7.0/Bacon (Blaauw and Christen, 2011) # KIA 36788 582 583 G. ruber pink 10830 55 14C AMS Marine13 12256 12532 11945 Calb 7.0/Bacon (Blaauw and Christen, 2011) # CAMS 126572 610 611 G. ruber pink 11640 35 14C AMS Marine13 13148.1 13306.1 12951.5 Calb 7.0/Bacon (Blaauw and Christen, 2011) # KIA 35267 620 621 G. ruber pink 12010 70 14C AMS Marine13 13456.4 13662.2 13280 Calb 7.0/Bacon (Blaauw and Christen, 2011) # CAMS 126573 645 646 G. ruber pink 12650 35 14C AMS Marine13 14220.4 14545.8 14001.1 Calb 7.0/Bacon (Blaauw and Christen, 2011) # KIA 36789 655 656 G. ruber pink 12845 60 14C AMS Marine13 14591.2 14934.7 14280.4 Calb 7.0/Bacon (Blaauw and Christen, 2011) # KIA 35268 670 671 G. ruber pink 13100 80 14C AMS Marine13 15195.7 15610.9 14843.2 Calb 7.0/Bacon (Blaauw and Christen, 2011) # CAMS 129838 700 701 G. ruber pink 14450 45 14C AMS Marine13 16966.5 17279.6 16566.5 Calb 7.0/Bacon (Blaauw and Christen, 2011) # KIA 35269 725 726 G. ruber pink 15140 100 14C AMS Marine13 17895.6 18174 17599.2 Calb 7.0/Bacon (Blaauw and Christen, 2011) # CAMS 129839 750 751 G. ruber pink 15775 45 14C AMS Marine13 18653.1 18819.5 18442.6 Calb 7.0/Bacon (Blaauw and Christen, 2011) # KIA37415 761.5 762.5 G. ruber pink 16040 180 14C AMS Marine13 18948.4 19201.6 18714.6 Calb 7.0/Bacon (Blaauw and Christen, 2011) # CAMS 126574 775 776 G. ruber pink 16420 50 14C AMS Marine13 19366 19587.1 19142.2 Calb 7.0/Bacon (Blaauw and Christen, 2011) # KIA37416 801.5 802.5 G. ruber pink 17210 150 14C AMS Marine13 20250.3 20507.7 19948.5 Calb 7.0/Bacon (Blaauw and Christen, 2011) # #--------------------------------------- # Variables # Data variables follow that are preceded by "##" in columns one and two. # Variables list, one per line, shortname-tab- 10 components: what, material, error, units, seasonality, archive, detail, method, C or N for Character or Numeric data,additional info ## depth_cm depth,,,cm,,,,,N, ## age_calyrBP age,,,calendars years BP,,,,,N, ## Mg/Ca-globo magnesium/calcium,globobulimina spp.,,mmol/mol,,paleoceanography,,,N, ## BWT-Mg/Ca bottom water temperature,globobulimina spp.; magnesium/calcium,,,,,,,N,Calculated using Mg/Ca[mmol/mol]?=?(0.36?±?0.02)*BWT[°C]?+?2.22?±?0.19; r-squared=0.92 ## BWT-Mg/Ca_up bottom water temperature,globobulimina spp.; magnesium/calcium,upper range,,,,,,N,Calculated using Mg/Ca[mmol/mol]?=?(0.36?±?0.02)*BWT[°C]?+?2.22?±?0.19; r-squared=0.92 ## BWT-Mg/Ca_lo bottom water temperature,globobulimina spp.; magnesium/calcium,lower range,,,,,,N,Calculated using Mg/Ca[mmol/mol]?=?(0.36?±?0.02)*BWT[°C]?+?2.22?±?0.19; r-squared=0.92 #------------------------ # Data # Data lines follow (have no #) # Data line format - tab-delimited text, variable short name as header # Missing Value: -999 depth_cm age_calyrBP Mg/Ca-globo BWT-Mg/Ca BWT-Mg/Ca_up BWT-Mg/Ca_lo 502.50 10066.40 3.07 2.35 3.05 1.83 537.50 10770.50 4.23 5.60 6.48 4.91 542.50 10891.60 3.74 4.23 5.04 3.61 572.50 11813.90 5.28 8.50 9.56 7.66 582.50 12256.20 5.56 9.28 10.39 8.40 587.50 12414.10 4.88 7.39 8.38 6.60 602.50 12889.00 4.22 5.57 6.45 4.88 610.50 13148.10 4.35 5.90 6.81 5.20 613.25 13244.50 3.56 3.72 4.50 3.13 620.50 13456.40 4.03 5.03 5.89 4.37 628.50 13705.10 4.08 5.16 6.03 4.50 643.50 14155.50 4.78 7.11 8.08 6.34 645.50 14220.40 4.84 7.29 8.27 6.51 657.50 14668.50 4.76 7.04 8.02 6.28 668.50 15106.20 4.86 7.34 8.34 6.56 679.50 15717.70 4.74 6.99 7.96 6.23 693.50 16564.10 5.16 8.16 9.20 7.34 713.50 17465.30 3.95 4.81 5.66 4.17 732.50 18113.10 3.45 3.43 4.19 2.86 753.50 18738.80 3.33 3.08 3.82 2.53 762.25 18976.10 3.43 3.35 4.10 2.78 773.50 19304.40 3.16 2.62 3.33 2.09 793.50 19974.50 3.71 4.15 4.95 3.54 802.25 20283.30 3.41 3.30 4.06 2.74 809.25 20496.60 3.44 3.38 4.14 2.81 813.50 20605.70 3.33 3.10 3.84 2.54