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Title Sum-
Institution Dataset ID
     data   graph     files  public 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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The Dataset's Variables and Attributes

Row Type Variable Name Attribute Name Data Type Value
attribute NC_GLOBAL access_formats String .htmlTable,.csv,.json,.mat,.nc,.tsv
attribute NC_GLOBAL acquisition_description String 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

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.
attribute NC_GLOBAL awards_0_award_nid String 554980
attribute NC_GLOBAL awards_0_award_number String OCE-0939564
attribute NC_GLOBAL awards_0_data_url String http://www.nsf.gov/awardsearch/showAward?AWD_ID=0939564 (external link)
attribute NC_GLOBAL awards_0_funder_name String NSF Division of Ocean Sciences
attribute NC_GLOBAL awards_0_funding_acronym String NSF OCE
attribute NC_GLOBAL awards_0_funding_source_nid String 355
attribute NC_GLOBAL awards_0_program_manager String David L. Garrison
attribute NC_GLOBAL awards_0_program_manager_nid String 50534
attribute NC_GLOBAL awards_1_award_nid String 626086
attribute NC_GLOBAL awards_1_award_number String OCE-1449604
attribute NC_GLOBAL awards_1_data_url String http://www.nsf.gov/awardsearch/showAward.do?AwardNumber=1449604 (external link)
attribute NC_GLOBAL awards_1_funder_name String NSF Division of Ocean Sciences
attribute NC_GLOBAL awards_1_funding_acronym String NSF OCE
attribute NC_GLOBAL awards_1_funding_source_nid String 355
attribute NC_GLOBAL awards_1_program_manager String Dr Thomas Janecek
attribute NC_GLOBAL awards_1_program_manager_nid String 511697
attribute NC_GLOBAL cdm_data_type String Other
attribute NC_GLOBAL comment String 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
Sedimentation Rate is based on using the youngest and oldest samples to
obtain an average for the dated part of the core.
** = outlier
attribute NC_GLOBAL Conventions String COARDS, CF-1.6, ACDD-1.3
attribute NC_GLOBAL creator_email String info at bco-dmo.org
attribute NC_GLOBAL creator_name String BCO-DMO
attribute NC_GLOBAL creator_type String institution
attribute NC_GLOBAL creator_url String https://www.bco-dmo.org/ (external link)
attribute NC_GLOBAL data_source String extract_data_as_tsv version 2.3 19 Dec 2019
attribute NC_GLOBAL date_created String 2019-03-28T19:12:31Z
attribute NC_GLOBAL date_modified String 2019-06-04T20:44:34Z
attribute NC_GLOBAL defaultDataQuery String &time<now
attribute NC_GLOBAL doi String 10.1575/1912/bco-dmo.763941.1
attribute NC_GLOBAL infoUrl String https://www.bco-dmo.org/dataset/763941 (external link)
attribute NC_GLOBAL institution String BCO-DMO
attribute NC_GLOBAL instruments_0_acronym String Piston Corer
attribute NC_GLOBAL instruments_0_dataset_instrument_nid String 769508
attribute NC_GLOBAL instruments_0_description String 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.
attribute NC_GLOBAL instruments_0_instrument_external_identifier String https://vocab.nerc.ac.uk/collection/L05/current/51/ (external link)
attribute NC_GLOBAL instruments_0_instrument_name String Piston Corer
attribute NC_GLOBAL instruments_0_instrument_nid String 519
attribute NC_GLOBAL instruments_1_acronym String AMS
attribute NC_GLOBAL instruments_1_dataset_instrument_description String 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.
attribute NC_GLOBAL instruments_1_dataset_instrument_nid String 769509
attribute NC_GLOBAL instruments_1_description String 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
attribute NC_GLOBAL instruments_1_instrument_external_identifier String https://vocab.nerc.ac.uk/collection/L05/current/LAB17/ (external link)
attribute NC_GLOBAL instruments_1_instrument_name String Accelerator Mass Spectrometer
attribute NC_GLOBAL instruments_1_instrument_nid String 527
attribute NC_GLOBAL keywords String 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
attribute NC_GLOBAL license String https://www.bco-dmo.org/dataset/763941/license (external link)
attribute NC_GLOBAL metadata_source String https://www.bco-dmo.org/api/dataset/763941 (external link)
attribute NC_GLOBAL param_mapping String {'763941': {}}
attribute NC_GLOBAL parameter_source String https://www.bco-dmo.org/mapserver/dataset/763941/parameters (external link)
attribute NC_GLOBAL people_0_affiliation String University of North Carolina at Chapel Hill
attribute NC_GLOBAL people_0_affiliation_acronym String UNC-Chapel Hill
attribute NC_GLOBAL people_0_person_name String Andreas P. Teske
attribute NC_GLOBAL people_0_person_nid String 51412
attribute NC_GLOBAL people_0_role String Principal Investigator
attribute NC_GLOBAL people_0_role_type String originator
attribute NC_GLOBAL people_1_affiliation String University of California-Santa Cruz
attribute NC_GLOBAL people_1_affiliation_acronym String UC Santa Cruz
attribute NC_GLOBAL people_1_person_name String Ana Christina Ravelo
attribute NC_GLOBAL people_1_person_nid String 661684
attribute NC_GLOBAL people_1_role String Co-Principal Investigator
attribute NC_GLOBAL people_1_role_type String originator
attribute NC_GLOBAL people_2_affiliation String University of California-Santa Cruz
attribute NC_GLOBAL people_2_affiliation_acronym String UC Santa Cruz
attribute NC_GLOBAL people_2_person_name String Ana Christina Ravelo
attribute NC_GLOBAL people_2_person_nid String 661684
attribute NC_GLOBAL people_2_role String Contact
attribute NC_GLOBAL people_2_role_type String related
attribute NC_GLOBAL people_3_affiliation String Woods Hole Oceanographic Institution
attribute NC_GLOBAL people_3_affiliation_acronym String WHOI BCO-DMO
attribute NC_GLOBAL people_3_person_name String Shannon Rauch
attribute NC_GLOBAL people_3_person_nid String 51498
attribute NC_GLOBAL people_3_role String BCO-DMO Data Manager
attribute NC_GLOBAL people_3_role_type String related
attribute NC_GLOBAL project String RAPID Guaymas Basin
attribute NC_GLOBAL projects_0_acronym String RAPID Guaymas Basin
attribute NC_GLOBAL projects_0_description String 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.
attribute NC_GLOBAL projects_0_end_date String 2015-08
attribute NC_GLOBAL projects_0_geolocation String Guaymas Basin
attribute NC_GLOBAL projects_0_name String RAPID proposal: Site characterization cruise to document the active and extensive subsurface biosphere in the Guaymas Basin
attribute NC_GLOBAL projects_0_project_nid String 626087
attribute NC_GLOBAL projects_0_start_date String 2014-09
attribute NC_GLOBAL publisher_name String Biological and Chemical Oceanographic Data Management Office (BCO-DMO)
attribute NC_GLOBAL publisher_type String institution
attribute NC_GLOBAL sourceUrl String (local files)
attribute NC_GLOBAL standard_name_vocabulary String CF Standard Name Table v55
attribute NC_GLOBAL summary String 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.
attribute NC_GLOBAL title String 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
attribute NC_GLOBAL version String 1
attribute NC_GLOBAL xml_source String osprey2erddap.update_xml() v1.3
variable Core   String  
attribute Core bcodmo_name String sample
attribute Core description String Core identification
attribute Core long_name String Core
attribute Core nerc_identifier String https://vocab.nerc.ac.uk/collection/P02/current/ACYC/ (external link)
attribute Core units String unitless
variable Depth_in_core   float  
attribute Depth_in_core _FillValue float NaN
attribute Depth_in_core actual_range float 1.5, 361.0
attribute Depth_in_core bcodmo_name String depth_core
attribute Depth_in_core colorBarMaximum double 8000.0
attribute Depth_in_core colorBarMinimum double -8000.0
attribute Depth_in_core colorBarPalette String TopographyDepth
attribute Depth_in_core description String Depth in core
attribute Depth_in_core long_name String Depth
attribute Depth_in_core standard_name String depth
attribute Depth_in_core units String centimters (cm)
variable C14_age   short  
attribute C14_age _FillValue short 32767
attribute C14_age actual_range short 1375, 10635
attribute C14_age bcodmo_name String C14_age
attribute C14_age description String 14C age
attribute C14_age long_name String C14 Age
attribute C14_age units String years before present (ybp)
variable C14_age_uncertainty   byte  
attribute C14_age_uncertainty _FillValue byte 127
attribute C14_age_uncertainty actual_range byte 25, 40
attribute C14_age_uncertainty bcodmo_name String C14_age
attribute C14_age_uncertainty description String Inherent uncertainty in the 14C method (+/- years)
attribute C14_age_uncertainty long_name String C14 Age Uncertainty
attribute C14_age_uncertainty units String +/- years before present (ybp)
variable Calendar_age   String  
attribute Calendar_age bcodmo_name String unknown
attribute Calendar_age description String Calendar age
attribute Calendar_age long_name String Calendar Age
attribute Calendar_age units String years before present (ybp)
variable Sed_Rate   float  
attribute Sed_Rate _FillValue float NaN
attribute Sed_Rate actual_range float 0.2286, 0.99
attribute Sed_Rate bcodmo_name String unknown
attribute Sed_Rate description String Sedimentation rate; based on using the youngest and oldest samples to obtain an average for the dated part of the core.
attribute Sed_Rate long_name String Sed Rate
attribute Sed_Rate units String millimeters per year (mm/year)

The information in the table above is also available in other file formats (.csv, .htmlTable, .itx, .json, .jsonlCSV1, .jsonlCSV, .jsonlKVP, .mat, .nc, .nccsv, .tsv, .xhtml) via a RESTful web service.

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