# Florida Straits 35 - 20 KYrBP Mg/Ca SST and d18Osw Reconstructions #----------------------------------------------------------------------- # World Data Service for Paleoclimatology, Boulder # and # NOAA Paleoclimatology Program # National Centers for Environmental Information (NCEI) #----------------------------------------------------------------------- # # 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/19481 # Online_Resource: http://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/them2015/them2015.txt # # Archive: Paleoceanography # # Parameter_Keywords: sea surface temperature, salinity #--------------------------------------- # Contribution_Date # Date: 2015-11-20 #--------------------------------------- # Title # Study_Name: Florida Straits 35 - 20 KYrBP Mg/Ca SST and d18Osw Reconstructions #--------------------------------------- # Investigators # Investigators: Them, T.R. II; Schmidt, M.W.; Lynch-Stieglitz, J. #--------------------------------------- # Description and Notes # Description: Planktonic foraminiferal Mg/Ca and abundance data plus reconstructed SST and d18O-seawater from a Florida Straits sediment core # covering the Last Glacial Maximum and Marine Isotope Stage 3 (35 - 20 KYrBP). # # Provided Keywords: Mg/Ca paleothermometry, Dansgaard-Oeschger cycle, Heinrich event, AMOC, Marine Isotope Stage 3, Last Glacial Maximum #--------------------------------------- # Publication # Authors: Them, T.R. II, Schmidt, M.W. and Lynch-Stieglitz, J. # Published_Date_or_Year: 2015-10-01 # Published_Title: Millennial-Scale Tropical Atmospheric and Atlantic Ocean Circulation Change From the Last Glacial Maximum and Marine Isotope Stage 3 # Journal_Name: Earth and Planetary Science Letters # Volume: 427 # Issue: # Pages: 47-56 # Report Number: # DOI: 10.1016/j.epsl.2015.06.062 # Online_Resource: http://www.sciencedirect.com/science/article/pii/S0012821X15004252 # Full_Citation: # Abstract: Abrupt, millennial-scale climate oscillations, known as Dansgaard-Oeschger (D-O) cycles, characterized the climate system of the last glacial period. Although proxy evidence shows that D-O cycles resulted in large-scale changes in atmospheric circulation patterns around the planet, an understanding of how Atlantic Meridional Overturning Circulation (AMOC) varied across these events remains unclear. Here, we take advantage of the fact that both tropical atmospheric circulation changes corresponding to north-south shifts in the Intertropical Convergence Zone (ITCZ) and large-scale changes in ocean circulation associated with AMOC variability can be reconstructed in the same sediment core from the Florida Straits to examine the relationship between atmospheric and ocean circulation changes across D-O events. To reconstruct surface water conditions, Mg/Ca-paleothermometry and stable isotope measurements were combined on the planktonic foraminifera Globigerinoides ruber (white variety) from sediment core KNR166-2 JPC26 (24 19.61'N, 83 15.14'W; 546 m depth) to reconstruct a high-resolution record of sea surface temperature and d18OSEAWATER (a proxy for upper mixed layer salinity) during Marine Isotope Stages (MIS) 2 and 3 from 20 - 35 ka BP. As an additional proxy for upper water column salinity change, we also generate a faunal abundance record of the salinity-sensitive planktonic foraminifera Neogloboquadrina dutertrei. Our results suggest that rapid reductions in sea surface salinity occurred at the onset of D-O interstadials, while stadials are characterized by increased surface salinities. The most likely cause of these salinity changes was variation in the strength and position of the ITCZ across D-O events. Finally, we examine the relationship between millennial-scale atmospheric circulation changes recorded in the planktonic records and ocean circulation changes inferred from the benthic d18O record from our core. Our results provide some of the first evidence that AMOC strength did vary across at least one of the millennial-scale D-O cycles of MIS 3. #--------------------------------------- # Funding_Agency # Funding_Agency_Name: US National Science Foundation # Grant: OCE-0823498, OCE-0648258, OCE-0096472 #--------------------------------------- # Site Information # Site_Name: KNR166-2-26JPC # Location: Florida Straits # Country: USA # Northernmost_Latitude: 24.3268 # Southernmost_Latitude: 24.3268 # Easternmost_Longitude: -83.2523 # Westernmost_Longitude: -83.2523 # Elevation: -546 m #--------------------------------------- # Data_Collection # Collection_Name: Them2015MgCaSST # First_Year: 34492 # Last_Year: 20254 # Time_Unit: cal yr BP # Core_Length: 1120.25 # 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, , , calendar kyears before present, , , , ,N ## Mg/Ca-g.rub Magnesium/Calcium ratio, Globigerinoides ruber, , mmol/mol, , Paleoceanography, , analytical technique: incuctively-coupled plasma mass spectrometry,N ## sst Sea Surface Temperature, , , Degrees C, , Climate Reconstructions, G.ruber Mg/Ca, Anand et al. 2003,N ## d18Osw-ivf delta 18O seawater ice-volume free, , , per mil VSMOW, , Climate Reconstructions, , ,N ## n.duter/g Neogloboquadrina dutertrei, , , number per gram of sediment, , Paleoceanography, , manual count,N # #------------------------ # Data # Data lines follow (have no #) # Data line format - tab-delimited text, variable short name as header # Missing Value: -999 # depth_cm age_calkaBP Mg/Ca-g.rub sst d18Osw-ivf n.duter/g 784.25 20.25 3.206 23.7 1.12 10.67 786.25 20.37 3.183 23.6 1.31 6.92 788.25 20.48 3.193 23.6 1.51 5.49 790.25 20.60 3.395 24.3 1.27 4.67 792.25 20.72 2.805 22.2 1.09 5.96 794.25 20.83 3.016 23.0 0.95 9.58 796.25 20.95 3.252 23.9 1.65 2.42 798.25 21.06 3.085 23.3 1.59 1.9 800.25 21.18 3.375 24.3 1.33 1.41 802.25 21.29 3.138 23.5 1.19 2.78 804.25 21.41 3.318 24.1 1.66 10.38 806.25 21.52 3.330 24.1 1.46 7.36 808.25 21.64 3.126 23.4 1.11 11.03 810.25 21.75 3.260 23.9 1.14 3.6 812.25 21.87 3.433 24.5 1.17 7.23 814.25 21.98 3.166 23.6 1.34 6.32 816.25 22.10 3.444 24.5 1.29 7.44 818.25 22.21 3.252 23.9 1.55 6.96 820.25 22.33 3.280 23.9 1.21 6.84 822.25 22.44 3.130 23.4 1.35 10.53 824.25 22.56 3.392 24.3 1.29 4.96 826.25 22.67 3.232 23.8 1.39 9.82 828.25 22.79 3.094 23.3 1.31 9.14 830.25 22.90 3.687 25.3 1.61 9.2 832.25 23.02 3.523 24.7 1.05 10.93 834.25 23.13 3.745 25.4 1.20 15.92 836.25 23.25 3.937 26.0 -999 12.86 838.25 23.36 3.569 24.9 1.68 11.26 840.25 23.48 3.333 24.1 1.03 6.31 842.25 23.60 4.388 27.2 2.01 15 844.25 23.71 4.200 26.7 2.10 8.74 846.25 23.83 3.987 26.1 1.92 5.36 848.25 23.94 3.060 23.2 0.65 10.49 850.25 24.03 3.557 24.8 1.84 19.89 852.25 24.11 3.676 25.2 1.63 6.08 854.25 24.20 3.396 24.3 1.69 12 856.25 24.29 3.425 24.4 1.38 12.13 858.25 24.37 3.432 24.5 1.07 12.65 860.25 24.46 3.263 23.9 1.08 26.3 862.25 24.54 3.434 24.5 1.19 16.41 864.25 24.63 3.712 25.3 1.81 3.02 866.25 24.72 3.594 25.0 1.52 0 868.25 24.80 3.451 24.5 1.92 9.34 870.25 24.89 3.551 24.8 1.92 6.49 872.25 24.97 3.406 24.4 1.31 9.78 874.25 25.06 3.467 24.6 1.78 7.23 876.25 25.15 4.043 26.3 2.22 6 878.25 25.23 3.822 25.6 1.75 3.52 880.25 25.36 -999 -999 -999 -999 882.25 25.50 -999 -999 -999 -999 884.25 25.63 -999 -999 -999 -999 886.25 25.76 3.593 25.0 1.29 11.64 888.25 25.89 3.358 24.2 1.11 8.17 890.25 26.03 3.616 25.0 1.77 7.15 892.25 26.16 3.449 24.5 1.26 0 894.25 26.29 3.669 25.2 1.78 6.92 896.25 26.43 3.536 24.8 1.25 12.8 898.25 26.56 4.017 26.2 1.86 18.29 900.25 26.69 3.539 24.8 1.50 14.75 902.25 26.82 3.275 23.9 1.46 8.93 904.25 26.96 3.218 23.7 1.10 4.98 906.25 27.09 3.432 24.5 1.59 10.16 908.25 27.22 3.318 24.1 1.66 9.32 910.25 27.35 3.456 24.5 1.29 5.49 912.25 27.49 3.429 24.4 0.98 13.47 914.25 27.62 3.227 23.8 1.32 14.46 916.25 27.75 3.436 24.5 1.39 8.67 918.25 27.88 3.478 24.6 1.71 9.19 920.25 28.02 3.580 24.9 1.11 15.24 922.25 28.15 3.418 24.4 1.54 23.11 924.25 28.28 4.140 26.5 1.62 24.22 926.25 28.41 3.482 24.6 1.37 18.23 928.25 28.55 3.675 25.2 1.84 18.43 930.25 28.68 3.398 24.3 1.61 7.62 932.25 28.81 3.799 25.6 1.79 13.06 934.25 28.94 3.439 24.5 1.75 7.51 936.25 29.08 3.801 25.6 1.66 9.5 938.25 29.21 3.380 24.3 1.56 5.42 940.25 29.34 3.474 24.6 1.73 3.54 942.25 29.47 3.661 25.2 1.64 8.42 944.25 29.61 3.551 24.8 -999 9.75 946.25 29.74 3.628 25.1 1.91 3.44 948.25 29.87 3.800 25.6 1.64 8.89 950.25 30.00 3.940 26.0 1.88 10.67 952.25 30.14 3.521 24.7 1.50 7.03 954.25 30.18 4.197 26.7 1.79 10.85 956.25 30.23 3.898 25.9 1.67 3.48 958.25 30.27 3.614 25.0 1.80 7.73 960.25 30.32 3.484 24.6 1.30 9.8 962.25 30.36 3.797 25.6 1.88 7.19 964.25 30.41 3.922 25.9 2.06 13.25 966.25 30.45 3.687 25.2 1.77 22.71 968.25 30.49 3.668 25.2 1.63 19.03 970.25 30.54 3.741 25.4 1.72 5.03 972.25 30.58 3.647 25.1 1.44 24 974.25 30.63 3.388 24.3 1.83 25.6 976.25 30.67 3.691 25.3 1.43 11.33 978.25 30.72 3.983 26.1 1.93 9.41 980.25 30.76 4.090 26.4 -999 22.46 982.25 30.81 3.580 24.9 1.48 13.41 984.25 30.85 3.487 24.6 1.40 8.85 986.25 30.90 3.560 24.9 1.33 16.2 988.25 30.94 3.507 24.7 1.67 14.74 990.25 30.99 3.656 25.2 1.90 29.77 992.25 31.03 3.788 25.5 1.51 23.41 994.25 31.08 3.649 25.1 1.40 26.53 996.25 31.12 3.766 25.5 1.84 33.51 998.25 31.16 3.859 25.8 1.72 21.69 1000.25 31.21 4.056 26.3 1.73 13.39 1002.25 31.25 3.444 24.5 1.34 23.37 1004.25 31.30 3.758 25.5 1.36 28.74 1006.25 31.34 3.311 24.1 1.28 19.56 1008.25 31.39 3.556 24.8 1.43 22.65 1010.25 31.43 3.587 24.9 1.69 23.21 1012.25 31.48 3.511 24.7 1.33 15.76 1014.25 31.52 3.383 24.3 0.90 49.55 1016.25 31.57 3.375 24.3 1.22 31.22 1018.25 31.62 3.325 24.1 1.40 7.88 1020.25 31.67 3.727 25.4 1.76 14.97 1022.25 31.72 3.124 23.4 1.41 1.88 1024.25 31.77 3.464 24.6 1.25 13.85 1026.25 31.82 3.294 24.0 1.52 20.65 1028.25 31.86 3.635 25.1 1.59 3.52 1030.25 31.91 3.559 24.9 1.29 28.44 1032.25 31.96 -999 -999 -999 13.56 1034.25 32.01 3.508 24.7 1.18 12.13 1036.25 32.06 3.728 25.4 1.31 20.38 1038.25 32.11 3.442 24.5 1.20 32.73 1040.25 32.16 3.770 25.5 1.23 31.43 1042.25 32.21 3.625 25.1 0.95 44.26 1044.25 32.26 4.001 26.2 1.09 26.48 1046.25 32.30 4.100 26.4 1.26 12.72 1048.25 32.35 3.738 25.4 1.08 23.83 1050.25 32.40 3.744 25.4 1.06 38.05 1052.25 32.45 4.068 26.3 1.99 21.19 1054.25 32.50 3.527 24.8 0.90 35.12 1056.25 32.55 3.353 24.2 0.84 17.3 1058.25 32.60 3.926 25.9 1.47 33.49 1060.25 32.65 3.919 25.9 1.64 36.13 1062.25 32.70 3.589 25.0 0.80 19.75 1064.25 32.75 3.325 24.1 0.85 19.01 1066.25 32.79 4.100 26.4 1.93 19.39 1068.25 32.84 3.337 24.1 1.34 8.83 1070.25 32.89 3.542 24.8 1.83 11.03 1072.25 32.94 3.499 24.7 1.28 0 1074.25 32.99 3.775 25.5 1.46 7.53 1076.25 33.07 3.601 25.0 1.39 0 1078.25 33.15 3.796 25.6 1.68 0 1080.25 33.24 3.812 25.6 1.30 2.99 1082.25 33.32 3.693 25.3 1.85 10.27 1084.25 33.40 3.556 24.8 1.73 16.93 1086.25 33.48 3.249 23.8 0.89 30.66 1088.25 33.56 3.311 24.1 1.09 42.26 1090.25 33.65 3.660 25.2 1.38 17.78 1092.25 33.73 3.514 24.7 1.19 14.38 1094.25 33.81 4.020 26.2 1.32 16 1096.25 33.89 3.240 23.8 1.00 18.46 1098.25 33.97 3.402 24.4 1.35 23.56 1100.25 34.06 3.668 25.2 1.33 27.83 1102.25 34.14 3.186 23.6 0.65 31.3 1104.25 34.22 3.225 23.8 0.88 27.98 1106.25 34.25 3.538 24.8 0.99 24.75 1108.25 34.29 3.734 25.4 1.58 12.11 1110.25 34.32 3.446 24.5 1.21 22.73 1112.25 34.36 3.716 25.3 0.95 18.03 1114.25 34.39 3.771 25.5 1.60 55.96 1116.25 34.42 3.924 25.9 -999 33.68 1118.25 34.46 3.874 25.8 1.45 12.04 1120.25 34.49 4.070 26.3 1.32 25.95