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Dataset Title:  Radiocarbon [14C] ages of sedimentary organic matter and sedimentation rates
for Guaymas Basin and Sonora Margin sediments collected from R/V El Puma,
leaving Guaymas on October 14, 2014 and returning to Mazatlan on October 27,
2014
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Institution:  BCO-DMO   (Dataset ID: bcodmo_dataset_763941)
Information:  Summary ? | License ? | ISO 19115 | Metadata | Background (external link) | Files | Make a graph
 
Variable ?   Optional
Constraint #1 ?
Optional
Constraint #2 ?
   Minimum ?
 
   Maximum ?
 
 Core (unitless) ?          "P03"    "P13"
 Depth_in_core (Depth, centimters (cm)) ?          1.5    361.0
 C14_age (years before present (ybp)) ?          1375    10635
 C14_age_uncertainty (+/- years before present (ybp)) ?          25    40
 Calendar_age (years before present (ybp)) ?          "11258"    "775"
 Sed_Rate (millimeters per year (mm/year)) ?          0.2286    0.99
 
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The Dataset Attribute Structure (.das) for this Dataset

Attributes {
 s {
  Core {
    String bcodmo_name "sample";
    String description "Core identification";
    String long_name "Core";
    String nerc_identifier "https://vocab.nerc.ac.uk/collection/P02/current/ACYC/";
    String units "unitless";
  }
  Depth_in_core {
    Float32 _FillValue NaN;
    Float32 actual_range 1.5, 361.0;
    String bcodmo_name "depth_core";
    Float64 colorBarMaximum 8000.0;
    Float64 colorBarMinimum -8000.0;
    String colorBarPalette "TopographyDepth";
    String description "Depth in core";
    String long_name "Depth";
    String standard_name "depth";
    String units "centimters (cm)";
  }
  C14_age {
    Int16 _FillValue 32767;
    Int16 actual_range 1375, 10635;
    String bcodmo_name "C14_age";
    String description "14C age";
    String long_name "C14 Age";
    String units "years before present (ybp)";
  }
  C14_age_uncertainty {
    Byte _FillValue 127;
    Byte actual_range 25, 40;
    String bcodmo_name "C14_age";
    String description "Inherent uncertainty in the 14C method (+/- years)";
    String long_name "C14 Age Uncertainty";
    String units "+/- years before present (ybp)";
  }
  Calendar_age {
    String bcodmo_name "unknown";
    String description "Calendar age";
    String long_name "Calendar Age";
    String units "years before present (ybp)";
  }
  Sed_Rate {
    Float32 _FillValue NaN;
    Float32 actual_range 0.2286, 0.99;
    String bcodmo_name "unknown";
    String description "Sedimentation rate; based on using the youngest and oldest samples to obtain an average for the dated part of the core.";
    String long_name "Sed Rate";
    String units "millimeters per year (mm/year)";
  }
 }
  NC_GLOBAL {
    String access_formats ".htmlTable,.csv,.json,.mat,.nc,.tsv";
    String acquisition_description 
"Sediment cores were obtained by Piston coring (using commercial PVC core
liners) onboard R/V El Puma. The sediment cores were recovered during the RV
El Puma cruise in October 2014. Core PO3 is from the northwestern ridge flanks
[27\\u00b0N 37.6759/111\\u00b0W 52.5740; 1611 m depth], P10 is from ca. 1 mile
west of Ringvent [27\\u00b0N 30.5193/111\\u00b0W 42.1722 W; 1731 m depth], core
P11 is from the center of Ringvent [27\\u00b0N 30.5090/111\\u00b0W 40.6860, 1749
m], core P12 is from the upper Sonora Margin [27\\u00b0N 52.1129/111\\u00b0W
41.5902, 667 m], and core P13 is from the southeastern ridge flank of Guaymas
Basin [27\\u00b0N 12.4470/111\\u00b0W 13.7735, 1859m]. Sedimentation rates were
not inferred from cores P5 and P6 due to distortions by slumping. Measurements
were made on bulk sediment without authigenic carbonate phases, and thus the
majority of carbon in the samples is organic carbon produced by primary
producers.
 
Samples selected for radiocarbon analyses were freeze-dried, homogenized, and
acidified to remove CaCO\\u2083, allowing for the analysis of remaining organic
matter, and preventing the distortion of radiocarbon ages by methane-derived
carbonates. Acidification was performed on ~200 mg of sample, which was
treated with ~5ml buffered pH 5 acetic acid solution for ~24 hours to dissolve
the CaCO\\u2083. Samples were then rinsed with Milli-Q water 6 to 8 times to
remove the acetic acid. Acidified samples were then freeze-dried again, re-
homogenized and stored for \\u00b9\\u2074C and \\u00b9\\u00b3C analysis.
Radiocarbon dating was performed at Lawrence Livermore National Laboratory
Center for Accelerator Mass Spectrometry, and a reservoir age of 406 years was
used before conversion to calendar years using CALIB REV7.1.0. (Stuiver et al.
2019). The d\\u00b9\\u00b3C values of all the acidified samples used for
radiocarbon analyses were approximately -20 to -22\\u2030, as expected from
marine (primary producers) derived organic matter.";
    String awards_0_award_nid "554980";
    String awards_0_award_number "OCE-0939564";
    String awards_0_data_url "http://www.nsf.gov/awardsearch/showAward?AWD_ID=0939564";
    String awards_0_funder_name "NSF Division of Ocean Sciences";
    String awards_0_funding_acronym "NSF OCE";
    String awards_0_funding_source_nid "355";
    String awards_0_program_manager "David L. Garrison";
    String awards_0_program_manager_nid "50534";
    String awards_1_award_nid "626086";
    String awards_1_award_number "OCE-1449604";
    String awards_1_data_url "http://www.nsf.gov/awardsearch/showAward.do?AwardNumber=1449604";
    String awards_1_funder_name "NSF Division of Ocean Sciences";
    String awards_1_funding_acronym "NSF OCE";
    String awards_1_funding_source_nid "355";
    String awards_1_program_manager "Dr Thomas Janecek";
    String awards_1_program_manager_nid "511697";
    String cdm_data_type "Other";
    String comment 
"Radiocarbon [14C] ages of sedimentary organic matter and sedimentation rates  
   for Guaymas Basin and Sonora Margin sediments 
  PI: Andreas Teske (UNC Chapel Hill) 
  Co-PI: Ana Christina Ravelo (UC Santa Cruz) 
  Version date: 13-March-2019 
  Notes:  
   Sedimentation Rate is based on using the youngest and oldest samples to  
   obtain an average for the dated part of the core. 
   ** = outlier";
    String Conventions "COARDS, CF-1.6, ACDD-1.3";
    String creator_email "info@bco-dmo.org";
    String creator_name "BCO-DMO";
    String creator_type "institution";
    String creator_url "https://www.bco-dmo.org/";
    String data_source "extract_data_as_tsv version 2.3  19 Dec 2019";
    String date_created "2019-03-28T19:12:31Z";
    String date_modified "2019-06-04T20:44:34Z";
    String defaultDataQuery "&time<now";
    String doi "10.1575/1912/bco-dmo.763941.1";
    String history 
"2021-01-26T10:58:26Z (local files)
2021-01-26T10:58:26Z https://erddap.bco-dmo.org/erddap/tabledap/bcodmo_dataset_763941.html";
    String infoUrl "https://www.bco-dmo.org/dataset/763941";
    String institution "BCO-DMO";
    String instruments_0_acronym "Piston Corer";
    String instruments_0_dataset_instrument_nid "769508";
    String instruments_0_description "The piston corer is a type of bottom sediment sampling device. A long, heavy tube is plunged into the seafloor to extract samples of mud sediment. A piston corer uses a \"free fall\" of the coring rig to achieve a greater initial force on impact than gravity coring.  A sliding piston inside the core barrel reduces inside wall friction with the sediment and helps to evacuate displaced water from the top of the corer. A piston corer is capable of extracting core samples up to 90 feet in length.";
    String instruments_0_instrument_external_identifier "https://vocab.nerc.ac.uk/collection/L05/current/51/";
    String instruments_0_instrument_name "Piston Corer";
    String instruments_0_instrument_nid "519";
    String instruments_1_acronym "AMS";
    String instruments_1_dataset_instrument_description "Radiocarbon dating was performed at Lawrence Livermore National Laboratory Center for Accelerator Mass Spectrometry, using the 1 MV AMS system based around a NEC 3SDH-1 accelerator.";
    String instruments_1_dataset_instrument_nid "769509";
    String instruments_1_description "An AMS measures \"long-lived radionuclides that occur naturally in our environment. AMS uses a particle accelerator in conjunction with ion sources, large magnets, and detectors to separate out interferences and count single atoms in the presence of 1x1015 (a thousand million million) stable atoms, measuring the mass-to-charge ratio of the products of sample molecule disassociation, atom ionization and ion acceleration.\" AMS permits ultra low-level measurement of compound concentrations and isotope ratios that traditional alpha-spectrometry cannot provide. More from Purdue University: http://www.physics.purdue.edu/primelab/introduction/ams.html";
    String instruments_1_instrument_external_identifier "https://vocab.nerc.ac.uk/collection/L05/current/LAB17/";
    String instruments_1_instrument_name "Accelerator Mass Spectrometer";
    String instruments_1_instrument_nid "527";
    String keywords "age, bco, bco-dmo, biological, c14, C14_age, C14_age_uncertainty, calendar, Calendar_age, chemical, core, data, dataset, depth, Depth_in_core, dmo, erddap, management, oceanography, office, preliminary, rate, sed, Sed_Rate, uncertainty";
    String license "https://www.bco-dmo.org/dataset/763941/license";
    String metadata_source "https://www.bco-dmo.org/api/dataset/763941";
    String param_mapping "{'763941': {}}";
    String parameter_source "https://www.bco-dmo.org/mapserver/dataset/763941/parameters";
    String people_0_affiliation "University of North Carolina at Chapel Hill";
    String people_0_affiliation_acronym "UNC-Chapel Hill";
    String people_0_person_name "Andreas P. Teske";
    String people_0_person_nid "51412";
    String people_0_role "Principal Investigator";
    String people_0_role_type "originator";
    String people_1_affiliation "University of California-Santa Cruz";
    String people_1_affiliation_acronym "UC Santa Cruz";
    String people_1_person_name "Ana Christina Ravelo";
    String people_1_person_nid "661684";
    String people_1_role "Co-Principal Investigator";
    String people_1_role_type "originator";
    String people_2_affiliation "University of California-Santa Cruz";
    String people_2_affiliation_acronym "UC Santa Cruz";
    String people_2_person_name "Ana Christina Ravelo";
    String people_2_person_nid "661684";
    String people_2_role "Contact";
    String people_2_role_type "related";
    String people_3_affiliation "Woods Hole Oceanographic Institution";
    String people_3_affiliation_acronym "WHOI BCO-DMO";
    String people_3_person_name "Shannon Rauch";
    String people_3_person_nid "51498";
    String people_3_role "BCO-DMO Data Manager";
    String people_3_role_type "related";
    String project "RAPID Guaymas Basin";
    String projects_0_acronym "RAPID Guaymas Basin";
    String projects_0_description 
"Description from NSF project abstract:
The Guaymas Basin in the central Gulf of California is an active tectonic spreading center overlain with thick, organic-rich sediments. In contrast to typical deep-water, mid-ocean ridge spreading centers that have very focused magmatism and little or no sediment, magmatism in the Guaymas Basis is more broadly distributed. This broadly-distributed magmatism significantly expands the fraction of organic-rich sediments that may be subject to alteration by the magmatic heat and thus it greatly expands the range of environments that support hydrocarbon generation and microbial populations in the sediments. Recognition that magmatism is not confined to the spreading axis, but instead is distributed throughout Guaymas Basin, suggests that models for the natural sequestration of carbon, the formation of oceanic crust, and life in the subsurface in marginal rift basins should be reconsidered as this has implications for the long-term removal of atmospheric carbon dioxide (and hence potential climatic implications). The Principal Investigator of this RAPID proposal is a lead proponent on an International Ocean Discovery Program (IODP) proposal to study this system in depth through scientific ocean drilling. To properly plan this expensive IODP expedition, additional site characterization gained from sediment sampling and seismic data is required. This proposal requests funds for the Principal Investigator to participate on an already planned site survey cruise aboard the Mexican Research Vessel (RV) El Puma. The results from this cruise will provide valuable data, at an exceptionally low investment, to guide decisions about potential future scientific drilling in the Guaymas Basin.
This RAPID proposal requests funds for the Principal Investigator to participate on a Mexican site survey cruise in October 2014 on RV El Puma to collect five-meter gravity cores of an extensive sediment transect across the Guaymas Basin and to integrate sequencing-based microbial community analyses of subsurface bacteria and archaea with biogechemical characterizations of these subsurface sediments. Gravity coring and microbial community analysis will target cold non-hydrothermal sediments as well as off-axis hydrothermally-influenced sediments. The gravity coring campaign and the geochemistry/microbiology studies are coordinated with heatflow measurements and extensive 2D seismic analysis and high-resolution 3D seismic mapping by other planned Mexican and German cruises. This multi-pronged strategy will deliver the additional data and complete the site characterizations that are required to properly plan a potential IODP drilling expedition by the JOIDES Resolution.";
    String projects_0_end_date "2015-08";
    String projects_0_geolocation "Guaymas Basin";
    String projects_0_name "RAPID proposal: Site characterization cruise to document the active and extensive subsurface biosphere in the Guaymas Basin";
    String projects_0_project_nid "626087";
    String projects_0_start_date "2014-09";
    String publisher_name "Biological and Chemical Oceanographic Data Management Office (BCO-DMO)";
    String publisher_type "institution";
    String sourceUrl "(local files)";
    String standard_name_vocabulary "CF Standard Name Table v55";
    String summary "Radiocarbon [14C] ages of sedimentary organic matter and sedimentation rates for Guaymas Basin and Sonora Margin sediments collected from R/V El Puma (the Pacific Coast research vessel of the Autonomous University of Mexico) from October 14, 2014 to October 27, 2014.";
    String title "Radiocarbon [14C] ages of sedimentary organic matter and sedimentation rates for Guaymas Basin and Sonora Margin sediments collected from R/V El Puma, leaving Guaymas on October 14, 2014 and returning to Mazatlan on October 27, 2014";
    String version "1";
    String xml_source "osprey2erddap.update_xml() v1.3";
  }
}

 

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