# Southern Indian Ocean, Foraminifera-bound d18O Data over the Past 42 ky #----------------------------------------------------------------------- # World Data Service for Paleoclimatology, Boulder # and # NOAA Paleoclimatology Program #----------------------------------------------------------------------- # Template Version 4.0 # Encoding: UTF-8 # NOTE: Please cite original publication, NOAA Landing Page URL, dataset and publication DOIs (where available), and date accessed when using downloaded data. # If there is no publication information, please cite investigator, study title, NOAA Landing Page URL, and date accessed. # # Description/Documentation lines begin with '#' followed by a space # Data lines have no '#' # # NOAA_Landing_Page: https://www.ncei.noaa.gov/access/paleo-search/study/39058 # Landing_Page_Description: NOAA Landing Page of this file's parent study, which includes all study metadata. # # Study_Level_JSON_Metadata: https://www.ncei.noaa.gov/pub/data/metadata/published/paleo/json/noaa-ocean-39058.json # Study_Level_JSON_Description: JSON metadata of this data file's parent study, which includes all study metadata. # # Data_Type: Paleoceanography # # Dataset_DOI: 10.25921/1yxp-ks32 # # Science_Keywords: #--------------------------------------- # Resource_Links # # Data_Download_Resource: https://www.ncei.noaa.gov/pub/data/paleo/paleocean/indian_ocean/umling2023/umling2023-tt1811-50ggc_planktic_14c.txt # Data_Download_Description: NOAA Template File; Planktic 14C Data # #--------------------------------------- # Contribution_Date # Date: 2024-02-14 #--------------------------------------- # File_Last_Modified_Date # Date: 2024-12-31 #--------------------------------------- # Title # Study_Name: Southern Indian Ocean, Foraminifera-bound d18O Data over the Past 42 ky #--------------------------------------- # Investigators # Investigators: Umling, Natalie; Sikes, Elisabeth; Rafter, Patrick; Goodkin, Nathalie; Southon, John #--------------------------------------- # Description_Notes_and_Keywords # Description: #--------------------------------------- # Publication # Authors: Umling, N.E., Sikes, E., Rafter, P., Goodkin, N.F., and Southon, J.R. # Published_Date_or_Year: 2024 # Published_Title: Deglacial Carbon Escape From the Northern Rim of the Southern Ocean # Journal_Name: Geophysical Research Letters # Volume: 51 # Edition: # Issue: 8 # Pages: # Report_Number: e2023GL106413 # DOI: 10.1029/2023GL106413 # Online_Resource: # Full_Citation: # Abstract: The Southern Ocean regulates atmospheric CO2 and Earth's climate as a critical region for air-sea gas exchange, delicately poised between being a CO2 source and sink. Here, we estimate how long a water mass has remained isolated from the atmosphere and utilize 14C/12C ratios (Δ14C) to trace the pathway and escape route of carbon sequestered in the deep ocean through the mixed layer to the atmosphere. The position of our core at the northern margin of the Southern Indian Ocean, tracks latitudinal shifts of the Southern Ocean frontal zones across the deglaciation. Our results suggest an expanded glacial Antarctic region trapped CO2, whereas deglacial expansion of the subantarctic permitted ventilation of the trapped CO2, contributing to a rapid atmospheric CO2 rise. We identify frontal positions as a key factor balancing CO2 outgassing versus sequestration in a region currently responsible for nearly half of global ocean CO2 uptake. #--------------------------------------- # Funding_Agency # Funding_Agency_Name: US National Science Foundation # Grant: 2002630 #--------------------------------------- # Funding_Agency # Funding_Agency_Name: US National Science Foundation # Grant: 1559080 #--------------------------------------- # Site_Information # Site_Name: TT1811-50GGC # Location: Indian Ocean # Northernmost_Latitude: -38.344 # Southernmost_Latitude: -38.344 # Easternmost_Longitude: 77.715 # Westernmost_Longitude: 77.715 # Elevation_m: -1116 #--------------------------------------- # Data_Collection # Collection_Name: TT1811-50GGC_planktic_14C # First_Year: 42322 # Last_Year: 436 # Time_Unit: cal yr BP # Core_Length_m: # Parameter_Keywords: carbon isotopes # Notes: #--------------------------------------- # Chronology_Information # Chronology: Radiocarbon # Chronology_Download_Resource: https://www.ncei.noaa.gov/pub/data/paleo/templates/noaa-wds-paleo-14c-terms.csv # Chronology_Download_Description: Radiocarbon terms and definitions. # Chronology_Notes: # Rejection_Rationale: # Reservoir_Method: # Calibration_Method: # Age_Model_Method: Bacon version 2.5.7 (Blaauw & Christen, 2011) # Missing_Values: # Chronology_Table: # lab_code depth_end_cm depth_start_cm date_type material_dated age_calib_BP1950 age_calib_uncert_yr age_14C_BP1950 age_14C_1s_yr delta_R_yr delta_R_uncert_yr calib_curve # UCIAMS_250775 3 4 14C AMS G. inflata NA NA 2930 20 442 101 Marine20 # UCIAMS_250776 5 6 14C AMS G. inflata NA NA 2010 15 442 101 Marine20 # UCIAMS_250777 6 7 14C AMS G. inflata NA NA 2285 15 442 101 Marine20 # UCIAMS_250778 7 8 14C AMS G. inflata NA NA 2255 15 442 101 Marine20 # UCIAMS_250779 8 9 14C AMS G. inflata NA NA 4415 15 442 101 Marine20 # UCIAMS_250780 10 11 14C AMS G. inflata NA NA 4070 20 442 101 Marine20 # UCIAMS_240943 12 13 14C AMS G. inflata NA NA 5465 15 442 101 Marine20 # UCIAMS_250781 14 15 14C AMS G. inflata NA NA 4895 20 442 101 Marine20 # UCIAMS_250782 16 17 14C AMS G. inflata NA NA 6700 15 442 101 Marine20 # UCIAMS_250783 18 19 14C AMS G. inflata NA NA 6020 15 442 101 Marine20 # EDC_tie_1 24 25 tie point G. bulloides 18O tied to ice core 18O 9800 110 NA NA NA NA None # EDC_tie_2 26 27 tie point G. bulloides 18O tied to ice core 18O 11850 95 NA NA NA NA None # EDC_tie_3 32 33 tie point G. bulloides 18O tied to ice core 18O 12650 110 NA NA NA NA None # EDC_tie_4 34 35 tie point G. bulloides 18O tied to ice core 18O 14390 151 NA NA NA NA None # EDC_tie_5 46 47 tie point G. bulloides 18O tied to ice core 18O 17940 189 NA NA NA NA None # EDC_tie_6 62 63 tie point G. bulloides 18O tied to ice core 18O 26350 269 NA NA NA NA None # Fuji_tie_1 72 73 tie point G. bulloides 18O tied to ice core 18O 31000 315 NA NA NA NA None # EDC_tie_7 132 133 tie point G. bulloides 18O tied to ice core 18O 40800 350 NA NA NA NA None #--------------------------------------- # Variables # PaST_Thesaurus_Download_Resource: https://www.ncei.noaa.gov/access/paleo-search/skos/past-thesaurus.rdf # PaST_Thesaurus_Download_Description: Paleoenvironmental Standard Terms (PaST) Thesaurus terms, definitions, and relationships in SKOS format. # # Data variables follow that are preceded by "##" in columns one and two. # Variables list, one per line, shortname-tab-var components: what, material, error, units, seasonality, data type, detail, method, C or N for Character or Numeric data) # ## cruise sample identification,,,,,paleoceanography,,,C,sampling cruise identifier ## core sample identification,,,,,paleoceanography,,,C,site name ## top_depth depth at sample end,,,centimeter,,paleoceanography,,,N,Depth top of sample interval (cm) ## bottom_depth depth at sample start,,,centimeter,,paleoceanography,,,N,Depth bottom of sample interval (cm) ## min_age age,,one standard deviation lower bound,calendar year before present,,paleoceanography,,,N,Calibrated age; 1-sigma lower confidence bound ## mean_age age,,,calendar year before present,,paleoceanography,,,N,Mean calendar age ## max_age age,,one standard deviation upper bound,calendar year before present,,paleoceanography,,,N,Calibrated age; 1-sigma upper confidence bound ## uciams_code sample identification,,,dimensionless,,paleoceanography,,,N,UC Irvine AMS sample ID ## mat.dated notes,,,,,paleoceanography,,,C,Material Dated ## 14C.raw age,Globorotalia inflata,,radiocarbon year before present,,paleoceanography,raw,accelerator mass spectrometry,N,conventional radiocarbon age; years before 1950AD ## 14C.raw_err age,Globorotalia inflata,one standard error,radiocarbon year before present,,paleoceanography,raw,accelerator mass spectrometry,N,radiocarbon age ## d14C.raw Delta 14C,Globorotalia inflata,,per mil,,paleoceanography,raw,accelerator mass spectrometry,N,radiocarbon content ## d14C.raw_error Delta 14C,Globorotalia inflata,one standard error,per mil,,paleoceanography,raw,accelerator mass spectrometry,N,radiocarbon content ## res_min reservoir age,Globorotalia inflata,one standard deviation lower bound,calendar year,,paleoceanography,,,N,lower 66% probability density range of the oceanic reservoir age offset from the atmosphere ## res_max reservoir age,Globorotalia inflata,one standard deviation upper bound,calendar year,,paleoceanography,,,N,upper 66% probability density range of the oceanic reservoir age offset from the atmosphere ## res_med reservoir age,Globorotalia inflata,,calendar year,,paleoceanography,,,N,median probability of the oceanic reservoir age offset from the atmosphere ## rejected notes,,,,,paleoceanography,,,C,Rejected sample (yes/no) ## notes notes,,,,,paleoceanography,,,C,notes on rejected samples #------------------------ # Data: # Data lines follow (have no #) # Data line format - tab-delimited text, variable short name as header # Missing_Values: NA cruise core top_depth bottom_depth min_age mean_age max_age uciams_code mat.dated 14C.raw 14C.raw_err d14C.raw d14C.raw_error res_min res_max res_med rejected notes TT1811 50GGC 0 1 -36 436 982 233837 G. inflata 4650 20 -439.4 1.2 3387 4542 3989 Yes B-P reversal TT1811 50GGC 3 4 486 887 1263 250775 G. inflata 2930 20 -305.7 1.4 1282 2794 1865 No NA TT1811 50GGC 4 5 639 995 1344 240942 G. inflata 4290 15 -413.6 1.0 2639 3954 3110 Yes B-P reversal TT1811 50GGC 5 6 787 1080 1399 250776 G. inflata 2010 15 -221.4 1.3 116 1665 759 No NA TT1811 50GGC 6 7 949 1200 1509 250777 G. inflata 2285 15 -247.6 1.2 369 1381 949 No NA TT1811 50GGC 7 8 1043 1343 1794 250778 G. inflata 2255 15 -244.7 1.3 335 1289 721 No NA TT1811 50GGC 8 9 1423 1918 2456 250779 G. inflata 4415 15 -422.9 1.0 2091 2819 2393 Yes B-P reversal TT1811 50GGC 10 11 2879 3358 3954 250780 G. inflata 4070 20 -397.5 1.1 527 1171 878 No NA TT1811 50GGC 12 13 3776 4436 5066 240943 G. inflata 5465 15 -493.4 0.8 1228 1696 1437 No NA TT1811 50GGC 14 15 4281 4917 5762 250781 G. inflata 4895 20 -456.3 1.0 311 783 479 No NA TT1811 50GGC 16 17 4910 5674 6444 250782 G. inflata 6700 15 -565.7 0.8 1325 2185 1690 No NA TT1811 50GGC 18 19 5469 6017 6845 250783 G. inflata 6020 15 -527.3 0.8 393 1037 707 No NA TT1811 50GGC 20 21 6046 6773 7539 233838 G. inflata 7070 20 -585.2 0.9 837 1302 1074 No NA TT1811 50GGC 21 22 6632 7182 7706 250784 G. inflata 6645 20 -562.6 0.9 -6 622 342 No NA TT1811 50GGC 22 23 7147 7633 8048 247437 G. inflata 7895 20 -625.8 0.7 519 1696 1045 No NA TT1811 50GGC 23 24 7585 8146 8756 257702 G. inflata 9735 25 -702.3 0.9 1719 2788 2342 No NA TT1811 50GGC 24 25 8737 9187 9635 257704 G. inflata 9410 20 -690.1 0.7 502 1490 1133 No NA TT1811 50GGC 25 26 9725 10579 11079 257706 G. inflata 9390 20 -689.3 0.7 -711 589 -55 No NA TT1811 50GGC 26 27 10378 11130 11554 247439 G. inflata 9890 25 -708.0 0.8 -584 1030 52 No NA TT1811 50GGC 28 29 11003 11649 12263 240944 G. inflata 11585 20 -763.6 0.5 1111 2015 1461 No NA TT1811 50GGC 29 30 11185 11824 12524 247441 G. inflata 11305 25 -755.2 0.6 833 1307 1086 No NA TT1811 50GGC 30 31 11390 11986 12705 247443 G. inflata 11660 25 -765.8 0.6 1154 1668 1319 No NA TT1811 50GGC 31 32 11616 12166 12920 247445 G. inflata 11460 25 -760.0 0.6 356 1464 1056 No NA TT1811 50GGC 32 33 11858 12371 13166 233839 G. inflata 12690 30 -794.0 0.7 1581 2668 2231 No NA TT1811 50GGC 33 34 12473 12913 13497 247359 G. inflata 11965 25 -774.5 0.6 -110 1637 899 No NA TT1811 50GGC 34 35 12918 13678 14181 247361 G. inflata 11940 25 -773.7 0.6 -627 970 33 No NA TT1811 50GGC 35 36 13291 14097 14728 247363 G. inflata 11790 25 -769.6 0.6 -891 261 -506 No NA TT1811 50GGC 36 37 13502 14430 15500 233840 G. inflata 12900 30 -799.3 0.6 -60 1063 467 No NA TT1811 50GGC 37 38 13831 14752 15770 247365 G. inflata 12655 30 -793.1 0.8 -364 586 134 No NA TT1811 50GGC 38 39 14052 15071 16226 247369 G. inflata 12605 25 -791.8 0.6 -502 279 107 No NA TT1811 50GGC 39 40 14321 15380 16490 247371 G. inflata 11390 30 -757.8 0.8 -1874 -1001 -1550 Yes age reversal TT1811 50GGC 40 41 14583 15683 16828 240945 G. inflata 14780 25 -841.1 0.5 1119 2336 1629 No NA TT1811 50GGC 41 42 14854 15976 17067 247373 G. inflata 15480 30 -854.4 0.5 1584 2574 2114 No NA TT1811 50GGC 42 43 15184 16271 17315 247375 G. inflata 15285 35 -850.8 0.6 1085 2357 1711 No NA TT1811 50GGC 43 44 15467 16567 17536 247378 G. inflata 16735 40 -875.5 0.6 2221 3474 2969 No NA TT1811 50GGC 44 45 15957 16861 17711 233841 G. inflata 17400 40 -885.4 0.5 2830 3940 3479 No NA TT1811 50GGC 45 46 16241 17154 17942 247382 G. inflata 18375 45 -898.5 0.5 3763 4693 4198 No NA TT1811 50GGC 46 47 16924 17522 18208 247384 G. inflata 18700 60 -902.5 0.6 3891 4890 4233 No NA TT1811 50GGC 47 48 17244 17915 18771 247386 G. inflata 19140 60 -907.7 0.6 3765 5024 4445 No NA TT1811 50GGC 48 49 17523 18408 19654 240946 G. inflata 19440 45 -911.1 0.5 3359 5023 4219 No NA TT1811 50GGC 49 50 17795 18916 20648 247388 G. inflata 19230 45 -908.7 0.5 2778 4131 3475 No NA TT1811 50GGC 50 51 18030 19448 21358 247390 G. inflata 19010 50 -906.2 0.5 2340 3234 2854 No NA TT1811 50GGC 51 52 18402 19975 22069 247394 G. inflata 19175 50 -908.1 0.6 1985 3166 2575 No NA TT1811 50GGC 52 53 18646 20498 22696 240947 G. inflata 19495 45 -911.7 0.5 1906 2895 2457 No NA TT1811 50GGC 53 54 19136 21029 23165 247396 G. inflata 19415 50 -910.8 0.5 1518 2313 1897 No NA TT1811 50GGC 54 55 19468 21561 23820 250787 G. inflata 19025 50 -906.4 0.6 789 1557 1190 No NA TT1811 50GGC 55 56 20013 22088 24142 250788 G. inflata 20150 60 -918.6 0.6 1237 2575 1929 No NA TT1811 50GGC 56 57 20442 22614 24650 233842 G. inflata 21190 60 -928.5 0.5 1765 2996 2410 No NA TT1811 50GGC 57 58 21099 23134 24929 250789 G. inflata 21200 70 -928.6 0.6 1555 2472 1881 No NA TT1811 50GGC 58 59 21629 23649 25299 250790 G. inflata 21680 80 -932.7 0.6 1179 2435 2031 No NA TT1811 50GGC 59 60 22128 24158 25595 250791 G. inflata 21550 70 -931.6 0.6 828 2168 1332 No NA TT1811 50GGC 60 61 23136 24697 25900 240948 G. inflata 21970 60 -935.1 0.4 773 1922 1393 No NA TT1811 50GGC 62 63 24840 25746 26503 250792 G. inflata 22710 80 -940.8 0.6 236 1796 1251 No NA TT1811 50GGC 64 65 25591 26602 27689 240949 G. inflata 24010 70 -949.7 0.4 641 2144 1586 No NA TT1811 50GGC 66 67 26144 27397 28768 250793 G. inflata 24060 100 -950.0 0.6 -175 1731 788 No NA TT1811 50GGC 68 69 26709 28187 29606 240950 G. inflata 24970 90 -955.3 0.5 186 1715 848 No NA TT1811 50GGC 72 73 27944 29715 30752 239075 G. inflata 26920 140 -964.9 0.6 452 1889 1474 No NA TT1811 50GGC 76 77 28714 30475 31759 250794 G. inflata 27640 150 -967.9 0.6 110 2435 1318 No NA TT1811 50GGC 80 81 29381 31193 32658 247398 G. inflata 28540 150 -971.4 0.5 323 2368 1185 No NA TT1811 50GGC 84 85 30119 31920 33500 240951 G. inflata 29960 180 -976.0 0.5 1286 2345 1844 No NA TT1811 50GGC 88 89 30822 32652 34300 250795 G. inflata 30500 230 -977.5 0.6 1523 2414 1982 No NA TT1811 50GGC 92 93 31551 33383 35047 250796 G. inflata 31050 330 -979.0 0.8 1571 2700 2077 No NA TT1811 50GGC 96 97 32316 34106 35784 250799 G. inflata 31010 330 -978.9 0.8 649 2187 1379 No NA TT1811 50GGC 100 101 33046 34833 36504 239077 G. inflata 32720 270 -983.0 0.6 1291 2788 2149 No NA TT1811 50GGC 104 105 33791 35553 37187 252232 G. inflata 33040 380 -983.6 0.8 1053 2534 1761 No NA TT1811 50GGC 108 109 34533 36268 37876 252233 G. inflata 33450 410 -984.5 0.8 766 2099 1438 No NA TT1811 50GGC 112 113 35336 36983 38519 252234 G. inflata 33950 430 -985.4 0.8 631 1811 1243 No NA TT1811 50GGC 116 117 36133 37708 39151 252235 G. inflata 34510 470 -986.4 0.8 696 1843 1293 No NA TT1811 50GGC 120 121 36936 38422 39766 252236 G. inflata 34230 450 -985.9 0.8 137 1266 669 No NA TT1811 50GGC 124 125 37789 39136 40364 252237 G. inflata 35000 480 -987.2 0.8 218 1773 934 No NA TT1811 50GGC 128 129 38686 39845 40960 252238 G. inflata 35690 530 -988.2 0.8 -50 1868 863 No NA TT1811 50GGC 132 133 39737 40579 41531 252239 G. inflata 36320 570 -989.1 0.8 -474 1998 686 No NA TT1811 50GGC 136 137 40478 41443 42488 252240 G. inflata 36800 610 -989.8 0.8 -1285 1954 10 No NA TT1811 50GGC 140 141 41228 42322 43369 252241 G. inflata 38170 720 -991.4 0.8 -2783 1570 -644 No NA