# Juan de Fuca Ridge Mass Flux Data over the Last 500 ka #----------------------------------------------------------------------- # World Data Center 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/21009 # Online_Resource: http://www1.ncdc.noaa.gov/pub/data/paleo/paleocean/by_contributor/costa2017/costa2017-12pc.txt # # Archive: Paleoceanography # # Parameter_Keywords: geochemistry, radiogenic isotope #--------------------------------------- # Contribution_Date # Date: 2016-12-01 #--------------------------------------- # Title # Study_Name: Juan de Fuca Ridge Mass Flux Data over the Last 500 ka #--------------------------------------- # Investigators # Investigators: Costa, K.M.; McManus, J.F. #--------------------------------------- # Description and Notes # Description: 11-Oct-17: Data table for 12PC updated to correct ordering of depths. #--------------------------------------- # Publication # Authors: Costa, K.M. and J.F. McManus # Published_Date_or_Year: 2017 # Published_Title: Efficacy of 230Th normalization in sediments from the Juan de Fuca Ridge, northeast Pacific Ocean # Journal_Name: Geochimica et Cosmochimica Acta # Volume: 197 # Edition: # Issue: # Pages: 215-225 # Report Number: # DOI: 10.1016/j.gca.2016.10.034 # Online_Resource: # Full_Citation: # Abstract: 230Th normalization is an indispensable method for reconstructing sedimentation rates and mass fluxes over time, but the validity of this approach has generated considerable debate in the paleoceanographic community. 230Th systematics have been challenged with regards to grain size bias, sediment composition (CaCO3), water column advection, and other processes. In this study, we investigate the consequences of these effects on 230Th normalization from a suite of six cores on the Juan de Fuca Ridge. The proximity of these cores (<30 km) suggests that they should receive the same particle rain rate of sediment, but the steep bathymetry of the ridge leads to substantial sediment redistribution and variable carbonate preservation, both of which may limit the usage of 230Th in this region. Despite anticipated complications, 230Th normalization effectively recon- structs nearly identical particle rain rates from all six cores, which are summarily unrelated to the total sedimentation rates as calculated from the age models. Instead the total sedimentation rates are controlled almost entirely by sediment focusing and winnowing, which are highly variable even over the short spatial scales investigated in this study. Furthermore, no feed- backs on 230Th systematics were detected as a consequence of sediment focusing, coarse fraction variability, or calcium car- bonate content, supporting the robustness of the 230Th normalization technique. #--------------------------------------- # Funding_Agency # Funding_Agency_Name: US National Science Foundation # Grant: AGS-1338832 #--------------------------------------- # Site Information # Site_Name: AT26-19 12PC # Location: North Pacific Ocean # Country: # Northernmost_Latitude: 44.8975 # Southernmost_Latitude: 44.8975 # Easternmost_Longitude: -130.50433 # Westernmost_Longitude: -130.50433 # Elevation: -2689 #--------------------------------------- # Data_Collection # Collection_Name: AT26-19 12PC Costa17 # First_Year: 8584 # Last_Year: 417219 # Time_Unit: cal yr BP # Core_Length: # Notes: Data table for core 12PC was updated on 20-Jan-17, as some of the depths were mislabeled. In the core IDs, TC = trigger core and PC = piston core. #--------------------------------------- # 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) ## coreID core ID,,, ,,paleoceanography,,,C" ## depth_cm depth,,,cm,,,,,N ## age_calyrBP age,,,cal yrs before present,,,,,N ## massflux Total mass flux,,,g cm-2 ka-1,,paleoceanography,,,N ## massflux_err_2s Total mass flux,,Two sigma error,g cm-2 ka-1,,paleoceanography,,,N #------------------------ # Data # Data lines follow (have no #) # Data line format - tab-delimited text, variable short name as header # Missing Value: NaN coreID depth_cm age_calyrBP massflux massflux_err_2s 12TC 0.5 8584 0.424 0.006 12TC 2.5 10328 0.456 0.006 12TC 4.5 12072 0.570 0.008 12TC 6.5 13816 0.575 0.008 12TC 8.5 15560 0.679 0.010 12TC 10.5 17304 0.705 0.011 12TC 12.5 19048 0.840 0.013 12PC 1.5 19866 1.290 0.023 12TC 14.5 20792 1.375 0.023 12PC 3.5 21229 1.294 0.024 12TC 16.5 22500 1.356 0.024 12TC 18.5 24098 1.308 0.023 12TC 20.5 25697 1.199 0.021 12PC 5.5 26438 1.035 0.018 12TC 22.5 27295 1.270 0.022 12TC 24.5 28894 0.771 0.013 12TC 26.5 30492 1.023 0.018 12PC 7.5 30534 1.020 0.019 12TC 28.5 32090 1.064 0.020 12TC 32.5 35287 1.001 0.018 12TC 36.5 38484 0.879 0.016 12TC 40.5 41681 0.865 0.016 12PC 9.5 43256 0.863 0.016 12TC 44.5 44878 0.790 0.015 12PC 11.5 47569 0.817 0.016 12TC 48.5 48075 0.786 0.015 12TC 52.5 51271 0.774 0.015 12TC 56.5 54468 0.756 0.015 12PC 13.5 55801 0.749 0.015 12PC 15.5 56428 0.762 0.016 12PC 17.5 58310 0.766 0.016 12PC 19.5 58938 0.842 0.018 12PC 21.5 60820 0.867 0.019 12PC 23.5 61447 0.923 0.021 12PC 25.5 63329 0.894 0.021 12PC 27.5 64584 1.007 0.024 12PC 29.5 65838 0.864 0.022 12PC 31.5 66867 0.955 0.026 12TC 74.5 68854 0.531 0.011 12TC 78.5 69925 0.748 0.017 12TC 82.5 72735 0.773 0.018 12PC 33.5 73589 0.891 0.024 12TC 86.5 75546 0.668 0.016 12PC 35.5 77377 0.879 0.024 12TC 90.5 78356 0.683 0.018 12TC 94.5 81166 0.767 0.021 12TC 98.5 85606 0.729 0.020 12TC 102.5 89291 0.709 0.021 12TC 106.5 91931 0.664 0.019 12TC 110.5 94570 0.628 0.018 12TC 114.5 97210 0.616 0.018 12TC 118.5 99850 0.540 0.016 12TC 122.5 106568 0.490 0.015 12PC 43.5 113198 0.514 0.017 12TC 126.5 115743 0.440 0.014 12PC 45.5 120930 0.529 0.018 12TC 130.5 124875 0.412 0.014 12PC 47.5 125108 0.475 0.017 12TC 134.5 127764 0.859 0.033 12PC 49.5 128559 0.702 0.026 12PC 51.5 130476 0.888 0.035 12TC 138.5 130513 1.041 0.043 12TC 142.5 132317 1.359 0.059 12PC 53.5 132425 1.368 0.060 12PC 55.5 134677 1.306 0.057 12PC 57.5 136929 1.294 0.059 12PC 59.5 139181 1.252 0.057 12PC 61.5 141433 1.274 0.059 12PC 63.5 143685 1.312 0.062 12PC 65.5 145937 1.281 0.060 12PC 67.5 148189 1.339 0.068 12PC 69.5 150441 1.310 0.068 12PC 71.5 152693 1.273 0.067 12PC 73.5 154945 1.235 0.067 12PC 75.5 157197 1.185 0.064 12PC 77.5 159449 1.204 0.067 12PC 79.5 161701 1.063 0.058 12PC 81.5 163953 1.170 0.066 12PC 83.5 166205 0.995 0.055 12PC 85.5 168457 0.976 0.055 12PC 87.5 170709 0.981 0.058 12PC 89.5 172961 0.945 0.057 12PC 91.5 175213 0.805 0.046 12PC 93.5 176619 0.930 0.054 12PC 95.5 177570 0.711 0.040 12PC 97.5 178520 0.721 0.043 12PC 99.5 179471 0.616 0.036 12PC 101.5 180767 0.655 0.040 12PC 103.5 182496 0.595 0.036 12PC 105.5 184225 0.575 0.036 12PC 107.5 185954 0.498 0.032 12PC 109.5 187683 0.596 0.039 12PC 111.5 189412 0.518 0.033 12PC 113.5 193004 0.523 0.035 12PC 115.5 197357 0.486 0.033 12PC 117.5 201710 0.510 0.037 12PC 119.5 206064 0.448 0.030 12PC 121.5 210417 0.464 0.035 12PC 123.5 214771 0.376 0.027 12PC 124.5 216947 0.511 0.043 12PC 127.5 223477 0.453 0.037 12PC 129.5 227831 0.602 0.063 12PC 131.5 232184 0.385 0.030 12PC 133.5 236538 0.504 0.045 12PC 135.5 240891 0.299 0.022 12PC 137.5 245244 0.702 0.086 12PC 141.5 251154 0.916 0.107 12PC 143.5 252982 0.841 0.085 12PC 145.5 254811 1.820 0.258 12PC 147.5 256639 1.340 0.154 12PC 149.5 258467 1.712 0.252 12PC 152.4 261119 1.822 0.297 12PC 156.4 264775 1.506 0.264 12PC 160.4 268432 1.559 0.342 12PC 164.4 271922 1.366 0.322 12PC 172.4 272212 2.772 1.416 12PC 168.4 272212 1.735 0.579 12PC 208.4 272212 19.793 62.927 12PC 184.4 272212 8.308 10.782 12PC 200.4 272212 15.302 29.465 12PC 212.4 273500 0.803 0.185 12PC 216.4 278067 0.590 0.099 12PC 220.4 282635 0.676 0.118 12PC 224.4 287202 0.693 0.116 12PC 228.4 290995 0.694 0.125 12PC 232.4 293562 0.661 0.114 12PC 236.4 296130 0.867 0.174 12PC 240.4 298697 0.753 0.129 12PC 244.4 301265 1.028 0.244 12PC 248.4 303832 0.695 0.124 12PC 252.4 306400 0.757 0.185 12PC 256.4 308967 0.697 0.128 12PC 260.4 312865 0.997 0.260 12PC 264.4 317658 0.691 0.134 12PC 268.4 322451 0.859 0.216 12PC 272.4 327243 0.898 0.244 12PC 276.4 332036 1.010 0.342 12PC 280.4 336829 1.557 0.596 12PC 284.4 342528 2.002 0.955 12PC 288.4 350426 1.766 0.614 12PC 292.4 358325 1.991 0.832 12PC 296.4 366223 1.528 0.512 12PC 300.4 374121 1.731 1.006 12PC 302.4 378070 1.131 0.454 12PC 306.4 385844 1.567 0.561 12PC 310.4 392746 1.684 0.933