# Leaf wax C30 n-alkane data from Indonesian marine sediments over the past 28,000 years #----------------------------------------------------------------------- # 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.ncdc.noaa.gov/access/paleo-search/study/35655 # 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-35655.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/z1n2-9309 # # Science_Keywords: Glacial, Heinrich Events, Last Glacial Maximum, Monsoon, Warm Pool, Tropics, Other Hydroclimate Reconstruction #--------------------------------------- # Resource_Links # # Data_Download_Resource: https://www.ncei.noaa.gov/pub/data/paleo/contributions_by_author/oppo2022/geo10069-3_oppo2022.txt # Data_Download_Description: NOAA Template File; Site Geo10069-3 C30 n-alkane Data # #--------------------------------------- # Contribution_Date # Date: 2022-02-17 #--------------------------------------- # File_Last_Modified_Date # Date: 2022-02-17 #--------------------------------------- # Title # Study_Name: Leaf wax C30 n-alkane data from Indonesian marine sediments over the past 25,000 years #--------------------------------------- # Investigators # Investigators: Oppo, Delia; Galy, Valier; Schefuss, Enno; Mohatdi, Mahyar; Rosenthal, Yair; Dubois, Natalie; Arbuszewski, Jennifer #--------------------------------------- # Description_Notes_and_Keywords # Description: Chronology Data for Core BJ803-91GGCC is from: Dubois, N., D.W. Oppo, V. Galy, M. Mohtadi, S. van der Kaars, J.E. Tierney, Y. Rosenthal, T.I. Eglinton, A. Lueckge, and B.K. Linsley. 2014. Indonesian vegetation response to changes in rainfall seasonality over the past 25,000 years. Nature Geoscience, 7, 513-517. doi: 10.1038/ngeo2182. Chronology Data for Core GEO10069-3 is from: Fern T. Gibbons, Delia W. Oppo, Mahyar Mohtadi, Yair Rosenthal, Jun Cheng, Zhengyu Liu, Braddock K. Linsley. 2014. Deglacial d18O and hydrologic variability in the tropical Pacific and Indian Oceans. Earth and Planetary Science Letters, 387, 240-251. doi: 10.1016/j.epsl.2013.11.032. C30 n-alkanoic data; We report values for the C30 n-alkanoic acid corrected for methylation. Sediments (5-10g) were freeze-dried and homogenized before lipid extraction using a microwave-assisted reaction system. Fatty acids were isolated from the total lipid extract by aminopropyl-silica-gel column chromatography, methylated with methanol of known isotopic composition, and then further purified by aminopropyl-silica-gel chromatography and silver nitrate-silica-gel chromatography. The purified compound class containing saturated straight chain fatty acids was analyzed by gas chromatography-isotope ratio mass spectrometry (GC-irMS) on a Finnigan Delta V Plus instrument at the Woods Hole Oceanographic Institution using established methods (Fornace et al., 2016). #--------------------------------------- # Publication # Authors: Gibbons, F.T.; Oppo, D.W.; Mohtadi, M.; Rosenthal, Y.; Cheng, J.; Liu, Z.; Linsley, B.K. # Published_Date_or_Year: # Published_Title: Deglacial d18O and hydrologic variability in the tropical Pacific and Indian Oceans. # Journal_Name: Earth and Planetary Science Letters # Volume: # Edition: # Issue: # Pages: 240-251 # Report_Number: # DOI: 10.1016/j.epsl.2013.11.032 # Online_Resource: # Full_Citation: # Abstract: Evidence from geologic archives suggests that there were large changes in the tropical hydrologic cycle associated with the two prominent northern hemisphere deglacial cooling events, Heinrich Stadial 1 (HS1; ~19 to 15 kyr BP; kyr BP = 1000 yr before present) and the Younger Dryas (~12.9 to 11.7 kyr BP). These hydrologic shifts have been alternatively attributed to high and low latitude origin. Here, we present a new record of hydrologic variability based on planktic foraminifera-derived d18O of seawater (d18Osw) estimates from a sediment core from the tropical Eastern Indian Ocean, and using 12 additional d18Osw records, construct a single record of the dominant mode of tropical Eastern Equatorial Pacific and Indo-Pacific Warm Pool (IPWP) hydrologic variability. We show that deglacial hydrologic shifts parallel variations in the reconstructed interhemispheric temperature gradient, suggesting a strong response to variations in the Atlantic Meridional Overturning Circulation and the attendant heat redistribution. A transient model simulation of the last deglaciation suggests that hydrologic changes, including a southward shift in the Intertropical Convergence Zone (ITCZ) which likely occurred during these northern hemisphere cold events, coupled with oceanic advection and mixing, resulted in increased salinity in the Indonesian region of the IPWP and the eastern tropical Pacific, which is recorded by the d18Osw proxy. Based on our observations and modeling results we suggest the interhemispheric temperature gradient directly controls the tropical hydrologic cycle on these time scales, which in turn mediates poleward atmospheric heat transport. #--------------------------------------- # Funding_Agency # Funding_Agency_Name: National Science Foundation # Grant: OCE-1060743, OCE-1657771 #--------------------------------------- # Funding_Agency # Funding_Agency_Name: National Oceanic and Atmospheric Administration # Grant: C&GC Postdoctoral Fellowship #--------------------------------------- # Funding_Agency # Funding_Agency_Name: Deutsche Forschungsgemeinschaft (DFG) # Grant: He3412/15-1 #--------------------------------------- # Funding_Agency # Funding_Agency_Name: Woods Hole Oceanographic Institution # Grant: Mellon Joint Initiatives Award #--------------------------------------- # Site_Information # Site_Name: Geo10069-3 # Location: Indonesia # Northernmost_Latitude: -9.59 # Southernmost_Latitude: -9.59 # Easternmost_Longitude: 120.231 # Westernmost_Longitude: 120.231 # Elevation_m: -1250 #--------------------------------------- # Data_Collection # Collection_Name: Geo10069-3_oppo2022 # First_Year: 25337 # Last_Year: 288 # Time_Unit: calendar year before present # Core_Length_m: 9.53 # Parameter_Keywords: biomarkers, geochemistry # Notes: #--------------------------------------- # Chronology_Information # Chronology: # Radiocarbon first published in Gibbons et al. (2014) (see metadata) # # 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 # delta-R Deviation from global mean reservoir correction # delta-R_err_lo elta-R standard error down # delta-R_err_up delta-R standard error up # 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 # # Labcode depth_top depth_bottom mat.dated 14C.raw 14C.raw_err datemeth reservoir delta-R delta-R_err_lo delta-R_err_up calib.14C calib.14C_2sig_lo calib.14C_2sig_up # OS-63152 8 mixed planktonics 755 35.00 14C AMS Marine20 -64 100 100 305 51 513 # OS-67318 65 mixed planktonics 1680 30.00 14C AMS Marine20 -64 100 100 1165 915 1395 # OS-63153 88 mixed planktonics 1970 35.00 14C AMS Marine20 -64 100 100 1469 1226 1739 # OS-67319 107 mixed planktonics 2260 30.00 14C AMS Marine20 -64 100 100 1804 1523 2096 # OS-67320 122 mixed planktonics 2360 30.00 14C AMS Marine20 -64 100 100 1926 1635 2238 # OS-63154 188 mixed planktonics 2910 35.00 14C AMS Marine20 -64 100 100 2602 3215 2875 # OS-63155 268 mixed planktonics 3950 35.00 14C AMS Marine20 -64 100 100 3888 4572 4212 # OS-63156 378 mixed planktonics 5140 35.00 14C AMS Marine20 -64 100 100 5400 5084 5658 # OS-63157 468 mixed planktonics 6800 45.00 14C AMS Marine20 -64 100 100 7203 6926 7450 # OS-63158 593 mixed planktonics 9450 65.00 14C AMS Marine20 -64 100 100 10246 9873 10599 # OS-67280 644 mixed planktonics 10600 50.00 14C AMS Marine20 -64 100 100 11874 11455 12321 # OS-63159 693 mixed planktonics 11700 55.00 14C AMS Marine20 -64 100 100 13115 12382 13382 # OS-67281 724 mixed planktonics 13200 75.00 14C AMS Marine20 -64 100 100 15160 14779 15574 # OS-63160 753 mixed planktonics 16050 75.00 14C AMS Marine20 -64 100 100 18637 18261 18932 # OS-67282 786 mixed planktonics 19050 90.00 14C AMS Marine20 -64 100 100 22222 21869 22568 # OS-63161 818 mixed planktonics 21900 110.00 14C AMS Marine20 -64 100 100 25391 25019 25739 # OS-67283 894 mixed planktonics 27100 160.00 14C AMS Marine20 -64 100 100 30535 30113 30923 # OS-63162 953 mixed planktonics 31000 240.00 14C AMS Marine20 -64 100 100 34710 34220 35248 # #--------------------------------------- # 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) # ## depth_cm depth,,,centimeter,,paleoceanography,,,N, ## age_BP age,,,calendar year before present,,paleoceanography,,,N,Radiocarbon dates are from Gibbons et al. (2014). Ages provided are the median ages using Bacon (Blaauw and Christen 2011) Marine20 and the reservoir ages provided in Chronology Tab ## C30_alk C30 n-alkane,,,per mil SMOW,,paleoceanography,,isotope ratio mass spectrometry,N,Samples were prepared and analyzed at WHOI ## C3_alkError C30 n-alkane,,one standard deviation,per mil SMOW,,paleoceanography,,isotope ratio mass spectrometry,N, #------------------------ # Data: # Data lines follow (have no #) # Data line format - tab-delimited text, variable short name as header # Missing_Values: NA depth_cm age_BP C30_alk C3_alkError 8 288 -147.48 0.34 48 907 -149.92 2.43 88 1471 -155.60 0.97 122 1916 -156.38 0.32 188 2650 -158.77 2.15 218 3102 -157.33 0.51 248 3574 -160.87 0.24 283 4079 -160.37 0.96 313 4504 -164.07 0.96 348 5019 -154.71 1.39 377 5422 -154.44 0.45 378 5436 -154.97 3.42 408 6016 -146.51 2.89 428 6417 -159.40 0.33 453 6931 -155.15 1.00 468 7218 -150.33 0.69 478 7433 -153.32 2.11 498 7923 -152.72 2.16 518 8440 -151.87 0.17 543 9071 -152.01 0.65 563 9553 -149.56 2.14 583 10034 -150.39 1.19 593 10279 -146.94 0.06 613 10892 -146.12 2.74 633 11524 -148.10 1.05 648 11959 -144.44 1.92 658 12206 -148.07 2.63 668 12463 -144.81 0.28 683 12853 -146.71 0.48 693 13156 -146.35 1.26 703 13677 -147.00 0.14 713 14355 -146.48 0.02 724 15180 -149.77 0.45 728 15490 -148.13 1.14 733 16131 -152.81 0.20 738 16715 -149.81 2.58 743 17380 -149.33 2.07 748 18105 -148.97 0.20 753 18615 -152.70 3.10 758 19095 -152.32 2.00 763 19667 -150.95 0.14 768 20172 -146.82 0.16 773 20771 -147.97 0.24 778 21397 -142.99 0.58 783 21887 -144.76 1.64 788 22409 -143.36 0.53 793 22883 -142.39 1.52 798 23310 -144.49 1.92 803 23889 -149.69 0.42 808 24455 -151.00 1.36 813 24879 -149.48 1.30 818 25337 -147.64 2.01