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Title Sum-
Institution Dataset ID
     data   graph     files  public Sedimentary radium isotope activity around Guaymas Basin from samples collected by HOV Alvin
during R/V Atlantis cruise AT37-06 in December 2016
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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,.esriCsv,.geoJson,.odvTxt
attribute NC_GLOBAL acquisition_description String Samples for this dataset were collected as push cores using the HOV Alvin
submersible. Analytical methods for measuring particulate Ra-224 and Th-228
are based on methods described in Cai et al. (2012; 2014). In short, once the
cores were recovered on the ship, overlying waters were siphoned off and the
sediment cores were sectioned in 2 cm vertical intervals for the top 10 cm,
then 4 cm intervals for the remainder of the core. A slurry was prepared by
adding ~\u00bc of the sediment volume (or ~1/8 of the sediment volume for the
4 cm intervals) to 150 mL of Ra-free tap water. The pH of the slurry was
adjusted by adding 5-10 drops of concentrated NH3-OH, after which 1 mL of 19
mM KMnO4 and 1 mL of 40 mM MnCl2 solutions were added to precipitate any
dissolved radium and thorium. A portion of this slurry was vacuum-filtered
onto pre-weighed 47 mm diameter GFF filters until no further drops passed
through the filter. Filters were dried in a drying oven (at 60 \u00b0C) for 12
hours, then placed is a filter holder within a cartridge and counted on a
Radium Delayed Coincidence Counter (Moore and Arnold, 1996). Results from this
analysis represent particulate Ra-224 activities. Filters were then measured
on the Radium Delayed Coincidence Counter again after 3 weeks, from which the
results are representative of Th-228 activities on the sediments.
attribute NC_GLOBAL awards_0_award_nid String 754842
attribute NC_GLOBAL awards_0_award_number String OCE-1558829
attribute NC_GLOBAL awards_0_data_url String http://www.nsf.gov/awardsearch/showAward.do?AwardNumber=1558829 (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 Henrietta N Edmonds
attribute NC_GLOBAL awards_0_program_manager_nid String 51517
attribute NC_GLOBAL cdm_data_type String Other
attribute NC_GLOBAL comment String Guaymas Sedimentary Radium
from cruise AT37-06
PI: Richard Peterson
Version date: 25-Nov-2019
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 2019-11-25T20:57:28Z
attribute NC_GLOBAL date_modified String 2019-12-09T17:26:51Z
attribute NC_GLOBAL defaultDataQuery String &time<now
attribute NC_GLOBAL doi String 10.1575/1912/bco-dmo.782858.1
attribute NC_GLOBAL Easternmost_Easting double -111.38469
attribute NC_GLOBAL geospatial_lat_max double 27.50622
attribute NC_GLOBAL geospatial_lat_min double 27.00729
attribute NC_GLOBAL geospatial_lat_units String degrees_north
attribute NC_GLOBAL geospatial_lon_max double -111.38469
attribute NC_GLOBAL geospatial_lon_min double -111.68317
attribute NC_GLOBAL geospatial_lon_units String degrees_east
attribute NC_GLOBAL infoUrl String https://www.bco-dmo.org/dataset/782858 (external link)
attribute NC_GLOBAL institution String BCO-DMO
attribute NC_GLOBAL instruments_0_acronym String Tube Core
attribute NC_GLOBAL instruments_0_dataset_instrument_description String Samples for this dataset were collected as push cores using the HOV Alvin submersible.
attribute NC_GLOBAL instruments_0_dataset_instrument_nid String 782868
attribute NC_GLOBAL instruments_0_description String A plastic tube, about 40 cm (16 inches) long, is pushed into the sediment by Alvin's manipulator arm to collect a sediment core.
attribute NC_GLOBAL instruments_0_instrument_name String Alvin tube core
attribute NC_GLOBAL instruments_0_instrument_nid String 641
attribute NC_GLOBAL instruments_1_acronym String RaDeCC
attribute NC_GLOBAL instruments_1_dataset_instrument_description String Filters were dried in a drying oven (at 60 °C) for 12 hours, then placed is a filter holder within a cartridge and counted on a Radium Delayed Coincidence Counter.
attribute NC_GLOBAL instruments_1_dataset_instrument_nid String 782869
attribute NC_GLOBAL instruments_1_description String The RaDeCC is an alpha scintillation counter that distinguishes decay events of short-lived radium daughter products based on their contrasting half-lives. This system was pioneered by Giffin et al. (1963) and adapted for radium measurements by Moore and Arnold (1996).

Giffin, C., A. Kaufman, W.S. Broecker (1963). Delayed coincidence counter for the assay of actinon and thoron. J. Geophys. Res., 68, pp. 1749-1757.
Moore, W.S., R. Arnold (1996). Measurement of 223Ra and 224Ra in coastal waters using a delayed coincidence counter.
J. Geophys. Res., 101 (1996), pp. 1321-1329.
Charette, Matthew A.; Dulaiova, Henrieta; Gonneea, Meagan E.; Henderson, Paul B.; Moore, Willard S.; Scholten, Jan C.; Pham, M. K. (2012). GEOTRACES radium isotopes interlaboratory comparison experiment. Limnology and Oceanography - Methods, vol 10, pg 451.
attribute NC_GLOBAL instruments_1_instrument_name String Radium Delayed Coincidence Counter
attribute NC_GLOBAL instruments_1_instrument_nid String 688
attribute NC_GLOBAL keywords String activity, alivn, Alivn_Dive_Num, bco, bco-dmo, biological, chemical, core, Core_Num, data, dataset, date, depth, Depth_Below_SWI, dive, dmo, erddap, filter, Filter_Mass, latitude, longitude, management, mass, num, oceanography, office, preliminary, ra224, Ra224_Activity, Ra224_Unc, th228, Th228_Activity, Th228_Unc, time, unc
attribute NC_GLOBAL license String https://www.bco-dmo.org/dataset/782858/license (external link)
attribute NC_GLOBAL metadata_source String https://www.bco-dmo.org/api/dataset/782858 (external link)
attribute NC_GLOBAL Northernmost_Northing double 27.50622
attribute NC_GLOBAL param_mapping String {'782858': {'Latitude': 'flag - latitude', 'Date_Time': 'flag - time', 'Longitude': 'flag - longitude'}}
attribute NC_GLOBAL parameter_source String https://www.bco-dmo.org/mapserver/dataset/782858/parameters (external link)
attribute NC_GLOBAL people_0_affiliation String Coastal Carolina University
attribute NC_GLOBAL people_0_person_name String Richard N. Peterson
attribute NC_GLOBAL people_0_person_nid String 701779
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 Woods Hole Oceanographic Institution
attribute NC_GLOBAL people_1_affiliation_acronym String WHOI BCO-DMO
attribute NC_GLOBAL people_1_person_name String Shannon Rauch
attribute NC_GLOBAL people_1_person_nid String 51498
attribute NC_GLOBAL people_1_role String BCO-DMO Data Manager
attribute NC_GLOBAL people_1_role_type String related
attribute NC_GLOBAL project String Guaymas Basin Ra 224 Approach
attribute NC_GLOBAL projects_0_acronym String Guaymas Basin Ra 224 Approach
attribute NC_GLOBAL projects_0_description String NSF Award Abstract:
This project proposes to validate a new approach to measure porewater flow dynamics from deep sea sediments using a biologically conservative, naturally-occurring tracer, Radium 224, which is constantly produced by porewaters. The technique will be validated using independent measures of porewater fluxes (i.e. heat gradients and magnesium profiles) during a cruise to the Guaymas Basin in the Gulf of California that is already funded by NSF. Once validated the technique will be broadly applicable to all sedimentary environments including oceans, rivers/streams, wetlands and lakes. Understanding porewater flow dynamics is important to understanding ocean and other aquatic system chemical budgets, microbial ecology and global heat flow.
This proposal hypothesizes that the short-lived radium isotope Ra 224 may serve as an effective tracer of porewater flows in deep ocean systems, regardless of the type or composition of seepages, because its sources and sinks can be uniquely constrained. The method will be tested in the Guaymas Basin which is comprised of areas undergoing a range of seepage rates and offers porewater thermal gradients resulting from the hydrothermal system. As a result heat fluxes and gradients in magnesium and other cations affected by high-temperature water/rock interactions can be used to independently validate the porewater flows measured by Ra 224.
attribute NC_GLOBAL projects_0_end_date String 2019-07
attribute NC_GLOBAL projects_0_geolocation String Guaymas Basin, Gulf of California
attribute NC_GLOBAL projects_0_name String Validation of a New Geochemical Approach to Constrain Deep Sea Porewater Residence Times and Advection Rates: Applications to Biogeochemical Cycling at Guaymas Basin
attribute NC_GLOBAL projects_0_project_nid String 754843
attribute NC_GLOBAL projects_0_start_date String 2016-02
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 Southernmost_Northing double 27.00729
attribute NC_GLOBAL standard_name_vocabulary String CF Standard Name Table v55
attribute NC_GLOBAL summary String This dataset presents sedimentary radium isotope activities around Guaymas Basin.
attribute NC_GLOBAL time_coverage_end String 2016-12-24T17:58Z
attribute NC_GLOBAL time_coverage_start String 2016-12-12T19:00Z
attribute NC_GLOBAL title String Sedimentary radium isotope activity around Guaymas Basin from samples collected by HOV Alvin during R/V Atlantis cruise AT37-06 in December 2016
attribute NC_GLOBAL version String 1
attribute NC_GLOBAL Westernmost_Easting double -111.68317
attribute NC_GLOBAL xml_source String osprey2erddap.update_xml() v1.3
variable Alivn_Dive_Num   short  
attribute Alivn_Dive_Num _FillValue short 32767
attribute Alivn_Dive_Num actual_range short 4861, 4872
attribute Alivn_Dive_Num bcodmo_name String dive_id
attribute Alivn_Dive_Num description String Numeric identifier for Alvin dive
attribute Alivn_Dive_Num long_name String Alivn Dive Num
attribute Alivn_Dive_Num units String unitless
variable Core_Num   byte  
attribute Core_Num _FillValue byte 127
attribute Core_Num actual_range byte 1, 31
attribute Core_Num bcodmo_name String core_id
attribute Core_Num description String Core tube identifier for the specific Alvin dive
attribute Core_Num long_name String Core Num
attribute Core_Num units String unitless
variable Depth_Below_SWI   byte  
attribute Depth_Below_SWI _FillValue byte 127
attribute Depth_Below_SWI actual_range byte 1, 44
attribute Depth_Below_SWI bcodmo_name String depth_bsf
attribute Depth_Below_SWI colorBarMaximum double 8000.0
attribute Depth_Below_SWI colorBarMinimum double -8000.0
attribute Depth_Below_SWI colorBarPalette String TopographyDepth
attribute Depth_Below_SWI description String Sampling depth below the sediment-water interface (SWI)
attribute Depth_Below_SWI long_name String Depth
attribute Depth_Below_SWI standard_name String depth
attribute Depth_Below_SWI units String centimeters (cm)
variable time   double  
attribute time _CoordinateAxisType String Time
attribute time actual_range double 1.4815692E9, 1.48260228E9
attribute time axis String T
attribute time bcodmo_name String ISO_DateTime_UTC
attribute time description String Sampling date and time (GMT); format: yyyy-mm-ddTHH:MM
attribute time ioos_category String Time
attribute time long_name String Date Time
attribute time nerc_identifier String https://vocab.nerc.ac.uk/collection/P01/current/DTUT8601/ (external link)
attribute time source_name String Date_Time
attribute time standard_name String time
attribute time time_origin String 01-JAN-1970 00:00:00
attribute time time_precision String 1970-01-01T00:00Z
attribute time units String seconds since 1970-01-01T00:00:00Z
variable latitude   double  
attribute latitude _CoordinateAxisType String Lat
attribute latitude _FillValue double NaN
attribute latitude actual_range double 27.00729, 27.50622
attribute latitude axis String Y
attribute latitude bcodmo_name String latitude
attribute latitude colorBarMaximum double 90.0
attribute latitude colorBarMinimum double -90.0
attribute latitude description String Sampling latitude
attribute latitude ioos_category String Location
attribute latitude long_name String Latitude
attribute latitude nerc_identifier String https://vocab.nerc.ac.uk/collection/P09/current/LATX/ (external link)
attribute latitude standard_name String latitude
attribute latitude units String degrees_north
variable longitude   double  
attribute longitude _CoordinateAxisType String Lon
attribute longitude _FillValue double NaN
attribute longitude actual_range double -111.68317, -111.38469
attribute longitude axis String X
attribute longitude bcodmo_name String longitude
attribute longitude colorBarMaximum double 180.0
attribute longitude colorBarMinimum double -180.0
attribute longitude description String Sampling longitude
attribute longitude ioos_category String Location
attribute longitude long_name String Longitude
attribute longitude nerc_identifier String https://vocab.nerc.ac.uk/collection/P09/current/LONX/ (external link)
attribute longitude standard_name String longitude
attribute longitude units String degrees_east
variable Filter_Mass   float  
attribute Filter_Mass _FillValue float NaN
attribute Filter_Mass actual_range float 0.067, 4.861
attribute Filter_Mass bcodmo_name String mass
attribute Filter_Mass description String Mass of dry sediments on filter
attribute Filter_Mass long_name String Filter Mass
attribute Filter_Mass units String grams (g)
variable Ra224_Activity   float  
attribute Ra224_Activity _FillValue float NaN
attribute Ra224_Activity actual_range float 0.141, 175.844
attribute Ra224_Activity bcodmo_name String radioactive_isotope_conc
attribute Ra224_Activity description String Measured activity of Ra-224
attribute Ra224_Activity long_name String Ra224 Activity
attribute Ra224_Activity nerc_identifier String https://vocab.nerc.ac.uk/collection/P02/current/WRAD/ (external link)
attribute Ra224_Activity units String dpm/g
variable Ra224_Unc   float  
attribute Ra224_Unc _FillValue float NaN
attribute Ra224_Unc actual_range float 0.022, 4.653
attribute Ra224_Unc bcodmo_name String radioactive_isotope_conc
attribute Ra224_Unc description String 1-s analytical uncertainty in measured activity of Ra-224
attribute Ra224_Unc long_name String Ra224 Unc
attribute Ra224_Unc nerc_identifier String https://vocab.nerc.ac.uk/collection/P02/current/WRAD/ (external link)
attribute Ra224_Unc units String dpm/g
variable Th228_Activity   float  
attribute Th228_Activity _FillValue float NaN
attribute Th228_Activity actual_range float 0.156, 328.275
attribute Th228_Activity bcodmo_name String radioactive_isotope_conc
attribute Th228_Activity description String Measured activity of Th-228
attribute Th228_Activity long_name String Th228 Activity
attribute Th228_Activity nerc_identifier String https://vocab.nerc.ac.uk/collection/P02/current/WRAD/ (external link)
attribute Th228_Activity units String dpm/g
variable Th228_Unc   float  
attribute Th228_Unc _FillValue float NaN
attribute Th228_Unc actual_range float 0.022, 6.694
attribute Th228_Unc bcodmo_name String radioactive_isotope_conc
attribute Th228_Unc description String 1-s analytical uncertainty in measured activity of Th-228
attribute Th228_Unc long_name String Th228 Unc
attribute Th228_Unc nerc_identifier String https://vocab.nerc.ac.uk/collection/P02/current/WRAD/ (external link)
attribute Th228_Unc units String dpm/g

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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