# Authigenic uranium concentrations in the Deep South Atlantic during the past 470 thousand years #----------------------------------------------------------------------- # World Data Service for Paleoclimatology, Boulder # and # NOAA Paleoclimatology Program #----------------------------------------------------------------------- # Template Version 3.0 # Encoding: UTF-8 # 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/28691 # Description: NOAA Landing Page # Online_Resource: https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/glasscock2020/glasscock2020-uranium.txt # Description: NOAA location of the template # # Data_Type: Paleoceanography # # Dataset_DOI: # # Parameter_Keywords: geochemistry #--------------------------------------- # Contribution_Date # Date: 2020-01-15 #--------------------------------------- # File_Last_Modified_Date # Date: 2020-01-15 #--------------------------------------- # Title # Study_Name: Authigenic uranium concentrations in the Deep South Atlantic during the past 470 thousand years #--------------------------------------- # Investigators # Investigators: Glasscock, Samuel; Hayes, Christopher; Redmond, Neil; Rohde, Evan #--------------------------------------- # Description_Notes_and_Keywords # Description: # Provided Keywords: Southern Ocean, overturning circulation, Antarctic Bottom Water #--------------------------------------- # Publication # Authors: Glasscock, S.K., C.T. Hayes, N. Redmond, E. Rohde # Published_Date_or_Year: 2020 # Published_Title: Changes in Antarctic Bottom Water Formation During Interglacial Periods # Journal_Name: Paleoceanography and Paleoclimatology # Volume: 35 # Edition: # Issue: # Pages: # Report_Number: e2020PA003867 # DOI: 10.1029/2020PA003867 # Online_Resource: # Full_Citation: # Abstract: In the modern Southern Ocean and during the last interglacial period, Marine Isotope Stage 5, there are observations that point to reduced Antarctic Bottom Water (AABW) formation. These reductions are believed to be driven by an increase in the strength of the Southern Ocean density stratification due to surface water freshening. Any reduction in AABW formation has important implications for global climate as AABW plays a vital role in the cycling of carbon in the world's ocean. The primary question this study seeks to answer is do these AABW reductions occur during any of the other interglacials of the past 500 thousand years? To study AABW changes in the paleoceanographic record we look at changes in the redox record. Newly formed AABW is oxygen-rich, so any reduction should lead to a decrease in oxygen concentrations in the deep Southern Ocean. The trace element uranium is useful for studying these redox changes as it is enriched in marine sediments under low-oxygen conditions. When accounting for other factors, such as paleoproductivity, that can also decrease the oxygen concentrations in sedimentary porewater, it is possible to identify changes in AABW using authigenic uranium. The survey conducted by this study found a possible AABW reduction during late Marine Isotope Stage 11 (~395 ka). However, this reduction does not appear to be triggered by a decrease in surface water density. Instead, a change in the strength or position of the southern hemisphere westerly winds is hypothesized to be the driving mechanism behind this reduction. #--------------------------------------- # Funding_Agency # Funding_Agency_Name: U.S. National Science Foundation # Grant: 1658445 #--------------------------------------- # Site_Information # Site_Name: ODP 1094 # Location: South Atlantic Ocean # Country: # Northernmost_Latitude: -53.2 # Southernmost_Latitude: -53.2 # Easternmost_Longitude: 5.1 # Westernmost_Longitude: 5.1 # Elevation: -2807 #--------------------------------------- # Data_Collection # Collection_Name: ODP1094 Uranium Glasscock2020 # First_Year: 466600 # Last_Year: 1217 # Time_Unit: cal yr BP # Core_Length: 75.14 # Notes: #--------------------------------------- # Chronology_Information # Chronology: # # The age model used for this study was derived and is reported by Hasenfratz et al. (2019). We reproduce here the tie points used for this study. # Reference: Hasenfratz et al., 2019. Science. http://doi.org/10.1126/science.aat7067 # ODP 1094 Depth (meters composite depth, top) Age (kyr ago) # 0 0.21 # 3.739557475 6.8190835 # 6.419118117 11.67622102 # 8.609219467 19.55976118 # 9.495020734 27.80593773 # 10.03638611 34.52283365 # 17.79139759 62.60216734 # 18.44059601 69.95110512 # 18.91481595 83.89506688 # 20.45790943 114.3415138 # 24.44826716 126.9300812 # 26.21017838 130.3187851 # 26.94613178 134.412415 # 27.98917714 149.9867172 # 28.18629618 153.9004645 # 28.51771826 157.1915851 # 29.23155169 160.6400056 # 29.89115259 173.9427152 # 33.07699256 192.1566563 # 35.91194003 215.2936713 # 39.11809157 236.0783633 # 39.40591386 240.5859086 # 39.80597083 242.8801869 # 41.68910951 246.7191282 # 43.45967163 256.0975551 # 45.13288336 267.463116 # 47.71303198 279.6257452 # 48.91296214 293.5154543 # 49.91121238 307.2901253 # 51.02759285 320.3830799 # 51.49923728 328.9760266 # 52.76513029 331.2986626 # 53.00802087 334.6712112 # 55.30193448 341.3587989 # 55.51710169 348.814711 # 60.34933086 395.1965949 # 66.97136011 410.1692504 # 67.8488685 419.9772651 # 70.85698455 428.8448558 # 71.12051837 436.9270762 # 75.08611888 463.0371323 # 75.4030106 483.9723218 # #--------------------------------------- # 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) ## mcd_top depth,,,meter,,Paleoceanography,,,N, ## age_kaBP age,,,calendar kiloyear before present,,Paleoceanography,,,N, ## U_238_ppm uranium,dry sediment,,parts per million,,Paleoceanography,,elemental analysis,N, ## Th_232_ppm thorium,dry sediment,,parts per million,,Paleoceanography,,elemental analysis,N, ## aU_ppm uranium,dry sediment,,parts per million,,Paleoceanography,,,N,Authigenic uranium is calculated by subtracting from the total measured uranium an estimate of the lithogenic uranium based on measured thorium-232 where available or based on measured concentrations of ice rafted debris and a correlation between ice rafted debris and thorium-232. #------------------------ # Data: # Data lines follow (have no #) # Data line format - tab-delimited text, variable short name as header # Missing_Values: -999 mcd_top age_kaBP U_238_ppm Th_232_ppm aU_ppm 0.57 1.217406417 1.082504146 0.568477874 0.990839295 0.87 1.747620321 1.171997437 0.495271809 1.092136779 1.17 2.277834225 1.180364674 0.414059537 1.113599181 1.47 2.808048128 1.622251542 0.455974254 1.548727463 1.77 3.338262032 1.525165923 0.423523493 1.456874403 2.07 3.868475936 1.679870852 0.412202903 1.613404733 2.37 4.39868984 1.569639856 0.4852293 1.491398514 2.67 4.928903743 1.57654341 0.339197836 1.521849075 2.97 5.459117647 1.426204524 0.362454706 1.367760109 3.27 5.989331551 1.394595946 0.29325723 1.347309355 3.57 6.519545455 1.3473646 0.227116408 1.31074296 3.87 7.055746269 1.253638266 0.200822454 1.221256425 4.17 7.599776119 1.365817056 0.228421963 1.328984901 4.47 8.14380597 1.035918456 0.191381649 1.005058908 4.77 8.687835821 1.031110604 0.165678 1.00439567 5.07 9.231865672 1.134112207 0.176455215 1.105659488 5.37 9.775895522 0.841447515 0.119297973 0.82221118 5.67 10.31992537 0.736921673 0.122293349 0.717202345 5.97 10.86395522 0.862360184 0.146060717 0.838808461 6.27 11.40798507 1.047791238 0.450273697 0.975186352 6.57 12.21972603 1.102847716 0.469616523 1.027123874 6.87 13.29917808 1.107960672 0.39416477 1.044403132 7.17 14.37863014 1.155299346 0.373399028 1.095090202 7.47 15.45808219 1.213777813 0.45201102 1.14089279 7.52 15.63799087 1.094945009 0.400863292 1.030307358 7.57 15.81789954 1.052443806 0.40107494 0.987772028 7.62 15.99780822 1.085249338 0.356664074 1.02773864 7.67 16.17771689 1.138968544 0.413751631 1.072252699 7.77 16.53753425 1.223526763 0.433451107 1.153634454 8.04 17.5090411 1.234924453 0.404557497 1.169691127 8.07 17.6169863 1.306943209 0.413566631 1.240257194 8.37 18.69643836 2.436286654 2.025143853 2.109740066 8.67 20.11617978 1.738460253 2.054631973 1.40715882 8.97 22.89707865 2.312717303 2.196270149 1.958577264 9.27 25.67797753 2.319592026 1.912819789 2.011157258 9.57 28.67981481 1.719100382 1.52782189 1.472745031 10.57 36.44030968 3.172198708 2.530305406 2.76419678 10.87 37.52727742 2.977939943 3.283569246 2.448477144 11.17 38.61424516 2.759667608 2.419511754 2.369530726 11.47 39.7012129 2.848294701 2.531690632 2.440069411 11.77 40.78818065 3.245274019 2.897485235 2.778065769 13.69 47.74477419 1.847681048 2.549570813 1.436572648 13.99 48.83174194 2.023493493 2.847156978 1.564400479 14.29 49.91870968 1.698147325 2.453425983 1.302541906 14.59 51.00567742 1.726203131 1.56797093 1.473373903 14.89 52.09264516 1.530798538 1.173509264 1.341574723 15.14 52.99845161 0.992487897 1.184765955 0.801448984 16.81 59.04923871 1.014142081 1.101828896 0.836476448 16.91 59.41156129 1.068692082 1.2583747 0.865784045 17.11 60.13620645 0.76281594 1.04060047 0.595023152 17.21 60.49852903 0.762034591 0.846949353 0.625467295 17.41 61.22317419 0.615256446 0.817592679 0.4834228 17.51 61.58549677 0.64070867 0.99941382 0.47955707 17.71 62.31014194 0.685164811 1.379378197 0.462745429 17.81 62.82615385 0.77666229 1.367905415 0.55609285 18.01 65.08769231 0.928783521 1.22446356 0.731343524 18.11 66.21846154 1.011120145 1.637073889 0.747148333 18.41 69.61076923 0.92705372 1.269576049 0.722339509 18.71 77.96382979 0.897658594 0.902581732 0.752120792 19.01 85.86387097 0.889111611 0.727589213 0.771790674 19.31 91.75548387 0.854324861 0.605047403 0.756763315 19.61 97.64709677 0.85605805 0.451389131 0.783273304 19.71 99.61096774 1.326778295 0.563416705 1.235929538 19.91 103.5387097 1.011906675 0.52055373 0.927969406 20.21 109.4303226 1.222874839 0.557308103 1.133011071 20.37 112.5725161 1.251087324 0.527416394 1.166043477 20.67 115.0026316 1.259139849 1.004871787 1.097108172 20.67 115.0026316 1.210218998 0.974682114 1.05305529 20.97 115.9492481 1.681255452 0.312842443 1.630810822 21.27 116.8958647 1.263808472 0.244706021 1.224350576 21.57 117.8424812 1.425017692 0.246163581 1.38532477 21.87 118.7890977 0.905924131 0.202164471 0.873325894 22.17 119.7357143 0.808056536 0.16291262 0.781787508 22.22 119.8934837 0.988610247 0.200873 0.956220255 22.32 120.2090226 1.109009464 0.260857753 1.066947163 22.37 120.366792 1.450779763 0.338435106 1.396208416 22.47 120.6823308 0.777847587 0.163178844 0.751535631 22.52 120.8401003 1.116154487 0.217431143 1.081094559 22.57 120.9978697 0.795911863 0.172807684 0.768047294 22.67 121.3134085 0.818491363 0.123659646 0.798551725 22.77 121.6289474 0.889075757 0.192851078 0.857979269 22.77 121.6289474 0.911761341 0.216905954 0.876786098 22.92 122.1022556 0.899562375 0.173749267 0.87154598 23.02 122.4177945 0.831782257 0.160449292 0.805910431 23.07 122.5755639 0.844225034 0.214234184 0.809680603 23.12 122.7333333 0.772501529 0.141857817 0.749627507 23.12 122.7333333 0.731251174 0.125685551 0.710984867 23.22 123.0488722 0.848622849 0.188567815 0.81821702 23.32 123.364411 1.07063969 0.265273029 1.027865443 23.42 123.6799499 1.088351329 0.234599332 1.050523097 23.52 123.9954887 1.049671495 0.207677168 1.016184357 23.67 124.468797 0.88045779 0.133704705 0.858898425 23.82 124.9421053 0.902930055 0.237376117 0.864654077 23.87 125.0998747 1.109223838 0.258862401 1.06748328 23.91 125.2260902 1.018677763 0.232033831 0.981263209 23.96 125.3838596 1.189207058 0.417567137 1.121875977 23.99 125.4785213 0.931633784 0.294393574 0.884163962 24.01 125.5416291 1.156186639 0.17122001 1.128578077 24.06 125.6993985 1.076204063 0.173661877 1.04820176 24.11 125.8571679 1.755606578 0.241136081 1.716724321 24.16 126.0149373 1.912502195 0.234680826 1.874660822 24.19 126.109599 1.950740723 0.272669467 1.90677383 24.22 126.2042607 2.915387202 0.310658107 2.865294788 24.23 126.2358145 2.519208896 0.253791866 2.478285942 24.23 126.2358145 2.437167671 0.221213966 2.401497777 24.23 126.2358145 2.451469177 0.224651567 2.415244984 24.26 126.3304762 2.868385907 0.321534561 2.816539707 24.31 126.4882456 2.957942567 0.29355915 2.910607294 24.36 126.646015 3.044616339 0.304427323 2.995528615 24.39 126.7406767 2.925128995 0.283332814 2.879442678 24.42 126.8353383 3.335447974 0.262238305 3.293163065 24.51 127.0455682 3.561991685 0.286491002 3.515796123 24.53 127.0840909 1.514128297 0.177943147 1.485435655 24.53 127.0840909 1.443661677 0.180754631 1.414515695 24.53 127.0840909 1.473296366 0.158777771 1.447694067 24.56 127.141875 2.973668383 0.239860767 2.934991765 24.59 127.1996591 2.869641562 0.259575869 2.827785961 24.62 127.2574432 3.457489628 0.279290971 3.412455043 24.66 127.3344886 3.680051885 0.261923348 3.637817761 24.69 127.3922727 2.631499992 0.249505025 2.591268275 24.71 127.4307955 2.798784266 0.237086702 2.760554956 24.76 127.5271023 2.451239531 0.224580547 2.415026789 24.81 127.6234091 2.278798197 0.177738345 2.250138578 24.86 127.7197159 1.855577306 0.160679533 1.829668355 24.89 127.7775 2.091408827 0.150777328 2.067096568 24.92 127.8352841 1.50753191 0.140875123 1.484816344 24.96 127.9123295 1.261468131 0.140675365 1.238784774 25.01 128.0086364 1.680100835 0.220087302 1.644612611 25.06 128.1049432 1.108098646 0.143761592 1.084917647 25.09 128.1627273 0.982195951 0.159477511 0.956480821 25.12 128.2205114 1.31379789 0.175193429 1.285548629 25.16 128.2975568 1.144063638 0.128325195 1.123371698 25.22 128.413125 0.957721721 0.115507411 0.939096599 25.26 128.4901705 0.886566499 0.10747116 0.869237191 25.26 128.4901705 0.886715444 0.131980957 0.865434027 25.29 128.5479545 0.970249169 0.180052674 0.941216374 25.36 128.6827841 0.892598248 0.088476069 0.878331825 25.42 128.7983523 0.920629699 0.116908508 0.901778656 25.46 128.8753977 0.914808056 0.112905867 0.896602423 25.46 128.8753977 0.92566107 0.140376014 0.903025983 25.52 128.9909659 0.893166628 0.115400822 0.874558693 25.54 129.0294886 0.994234595 0.140385594 0.971597963 25.59 129.1257955 1.152157272 0.153048345 1.12747882 25.67 129.2798864 1.178089899 0.131786396 1.156839854 25.77 129.4725 1.170488593 0.163705971 1.144091641 25.82 129.5688068 1.407263067 0.112875526 1.389062326 25.89 129.7036364 1.010875994 0.139989439 0.98830324 25.99 129.89625 1.262510739 0.269334758 1.219081555 26.07 130.0503409 1.330045066 0.175954209 1.301673133 26.19 130.2814773 1.341093514 0.172760604 1.313236537 26.24 130.4858108 1.127945555 0.165269584 1.101296476 26.32 130.927973 1.175357186 0.181658323 1.146065486 26.36 131.1490541 1.238542925 0.235964645 1.200494541 26.42 131.4806757 1.524160139 0.614834966 1.425020386 26.42 131.4806757 1.524160139 0.614834966 1.425020386 26.49 131.8675676 1.822594819 0.757078787 1.700518803 26.51 131.9781081 1.84248082 0.743094253 1.722659756 26.51 131.9781081 1.995716653 0.52671093 1.910786559 26.61 132.5308108 2.255287337 1.837384161 1.959016271 26.71 133.0835135 2.581698177 2.000770088 2.259081764 26.79 133.5256757 2.23512655 1.914959768 1.926346718 26.91 134.1889189 2.37827847 2.068551451 2.044732575 26.96 134.5598077 2.310469763 2.058842012 1.978489478 27.01 135.3088462 2.298274856 2.404168358 1.910612038 27.09 136.5073077 2.296973479 2.224428164 1.938293069 27.11 136.8069231 2.322326853 2.382091753 1.938223801 27.16 137.5559615 2.413662119 2.941987247 1.939278092 27.21 138.305 2.424546678 3.121498953 1.921217085 27.39 141.0015385 2.180425516 2.709553723 1.743520492 27.69 145.4957692 2.930362769 2.875340968 2.466725195 27.99 149.99 2.414423239 2.918163947 1.943880627 28.29 154.8969697 3.195840856 2.980984162 2.715168727 28.59 157.5301408 2.539071586 2.39347919 2.153132355 28.89 158.9878873 2.648279127 2.345640726 2.270053662 28.44 156.42 2.419342701 -999 2.12703608 28.79 158.51 1.097971213 -999 0.707768088 29.19 160.44 1.884077452 -999 1.653707591 29.34 162.83 2.114426832 -999 1.857026831 29.39 163.84 2.03370135 -999 1.783102764 29.49 165.85 2.10063098 -999 1.758410745 29.54 166.86 1.872298699 -999 1.477268763 29.59 167.87 1.887484502 -999 1.717735 29.64 168.88 1.905461571 -999 1.623686174 29.69 169.89 2.385682073 -999 2.110664211 29.79 171.9 2.730180996 -999 2.461240528 29.89 173.92 2.404278771 -999 2.181280768 30.27 176.108 1.829023771 -999 1.595828033 30.45 177.138 2.878114971 -999 2.72622467 30.64 178.22 2.605060205 -999 2.508063909 30.79 179.08 2.627028863 -999 2.504757629 30.99 180.22 2.629580107 -999 2.506167991 31.19 181.37 1.832090221 -999 1.709797047 31.69 184.23 1.781520376 -999 1.520127285 31.89 185.37 1.631547873 -999 1.429041876 32.07 186.398 1.568231342 -999 1.34298229 32.24 187.37 1.368841958 -999 1.124649866 32.44 188.51 1.251583217 -999 1.127929761 32.59 189.37 1.288104429 -999 1.179787067 32.79 190.52 1.242805832 -999 1.199738179 32.94 191.37 1.232332064 -999 1.136147549 33.24 193.49 1.333237237 -999 1.262963921 33.34 194.3 1.398140582 -999 1.246557441 33.49 195.53 1.169487819 -999 0.814893396 33.59 196.34 1.128130307 -999 0.834419522 33.74 197.57 1.116939471 -999 1.040435181 33.84 198.38 1.123374633 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