BCO-DMO ERDDAP
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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 \\u00a0\n \nPartition coefficient of 234Th, 233Pa, 210Pb, 210Po, and 7Be  \n Activity concentrations of 234Th, 233Pa, 210Pb, 210Po, and 7Be were measured\nby gamma counting the 63.5, 312, 46.5, and 477.6 keV lines, respectively, on a\nCanberra ultra-highpurity germanium well-type detector. The 210Po activity was\nanalyzed by liquid scintillation counting (Beckman Model 8100 Liquid\nScintillation Counter). The filter samples (> 0.2 um particulate phase) were\nsoaked with 1 mol L-1 HCl for 20 min in a counting vial, and the filtrate\nsamples (< 0.2 um dissolved phase) were transferred into counting vials\ndirectly. Both filter and filtrate samples were then counted for activities of\neach radionuclide. All reported activities were decay and geometry corrected.\n233Pa was added in equilibrium with 237Np. Under a wide range of environmental\nconditions, aqueous neptunium speciation is believed to be dominated by the\npentavalent cation NpO2+. Np(V) is relative soluble and tends to remain in the\nwater phase, unlike other actinides, such as Pu and Am, which are readily\nadsorbed by particles in the environment (Atwood 2013). In our absorption\nexperiments, 237Np activities could be found only in the dissolved phase for\nall samples, supporting the assumption that 237Np would not adsorb onto\nparticles during the time for which decay and in-growth corrections of 233Pa\nwere applied. Traditional partition coefficients (Kd) between dissolved and\nparticulate phases were used to quantify the sorption of radionuclides onto\ndifferent particles in different experimental systems. Kd was defined here as\n \nKd = Ap x (Ad x Cp)^-1\\u00a0 \\u00a0 \\u00a0 \\u00a0 \\u00a0 \\u00a0(1)\n \nwhere Ap and Ad represent particulate and dissolved activities (Bq L-1) of\nradionuclides and Cp is the particle concentration (kg L-1; Honeyman and\nSantschi 1989; Guo and Santschi 1997).
attribute NC_GLOBAL awards_0_award_nid String 735995
attribute NC_GLOBAL awards_0_award_number String OCE-1356453
attribute NC_GLOBAL awards_0_data_url String http://www.nsf.gov/awardsearch/showAward.do?AwardNumber=1356453 (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 Partition coefficient of 234Th, 233Pa, 210Pb, 210Po, and 7Be \n  PI: Peter H. Santschi \n  Version: 2019-04-10
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 2019-04-10T17:32:05Z
attribute NC_GLOBAL date_modified String 2019-04-11T20:01:18Z
attribute NC_GLOBAL defaultDataQuery String &amp;time&lt;now
attribute NC_GLOBAL doi String 10.1575/1912/bco-dmo.764664.1
attribute NC_GLOBAL infoUrl String https://www.bco-dmo.org/dataset/764664 (external link)
attribute NC_GLOBAL institution String BCO-DMO
attribute NC_GLOBAL instruments_0_acronym String LSC
attribute NC_GLOBAL instruments_0_dataset_instrument_description String The 210Po activity was analyzed by liquid scintillation counting (Beckman Model 8100 Liquid Scintillation Counter).
attribute NC_GLOBAL instruments_0_dataset_instrument_nid String 764686
attribute NC_GLOBAL instruments_0_description String Liquid scintillation counting is an analytical technique which is defined by the incorporation of the radiolabeled analyte into uniform distribution with a liquid chemical medium capable of converting the kinetic energy of nuclear emissions into light energy. Although the liquid scintillation counter is a sophisticated laboratory counting system used the quantify the activity of particulate emitting (ß and a) radioactive samples, it can also detect the auger electrons emitted from 51Cr and 125I samples.
attribute NC_GLOBAL instruments_0_instrument_external_identifier String https://vocab.nerc.ac.uk/collection/L05/current/LAB21/ (external link)
attribute NC_GLOBAL instruments_0_instrument_name String Liquid Scintillation Counter
attribute NC_GLOBAL instruments_0_instrument_nid String 624
attribute NC_GLOBAL instruments_0_supplied_name String Beckman Model 8100 Liquid Scintillation Counter
attribute NC_GLOBAL instruments_1_dataset_instrument_description String For IEF (isoelectric focusing electrophoresis), a Pharmacia Biotech Multiphor II with a EPS3500 XL power supply was used.
attribute NC_GLOBAL instruments_1_dataset_instrument_nid String 764672
attribute NC_GLOBAL instruments_1_description String General term for an apparatus used in clinical and research laboratories to separate charged colloidal particles (or molecules) of varying size through a medium by applying an electric field.
attribute NC_GLOBAL instruments_1_instrument_name String Electrophoresis Chamber
attribute NC_GLOBAL instruments_1_instrument_nid String 471592
attribute NC_GLOBAL instruments_1_supplied_name String Pharmacia Biotech Multiphor II
attribute NC_GLOBAL instruments_2_dataset_instrument_description String Activity concentrations of 234Th, 233Pa, 210Pb, 210Po, and 7Be were measured by gamma counting the 63.5, 312, 46.5, and 477.6 keV lines, respectively, on a Canberra ultra-highpurity\ngermanium well-type detector.
attribute NC_GLOBAL instruments_2_dataset_instrument_nid String 764687
attribute NC_GLOBAL instruments_2_description String Instruments measuring the relative levels of electromagnetic radiation of different wavelengths in the gamma-ray waveband.
attribute NC_GLOBAL instruments_2_instrument_name String Gamma Ray Spectrometer
attribute NC_GLOBAL instruments_2_instrument_nid String 670659
attribute NC_GLOBAL instruments_2_supplied_name String Canberra ultra-highpurity germanium well-type detector
attribute NC_GLOBAL keywords String bco, bco-dmo, Be_sd, biological, chemical, data, dataset, dmo, erddap, management, oceanography, office, Pa_sd, particle, Particle_type, Pb_sd, Po_sd, preliminary, Th_sd, type
attribute NC_GLOBAL license String https://www.bco-dmo.org/dataset/764664/license (external link)
attribute NC_GLOBAL metadata_source String https://www.bco-dmo.org/api/dataset/764664 (external link)
attribute NC_GLOBAL param_mapping String {'764664': {}}
attribute NC_GLOBAL parameter_source String https://www.bco-dmo.org/mapserver/dataset/764664/parameters (external link)
attribute NC_GLOBAL people_0_affiliation String Texas A&M, Galveston
attribute NC_GLOBAL people_0_affiliation_acronym String TAMUG
attribute NC_GLOBAL people_0_person_name String Peter Santschi
attribute NC_GLOBAL people_0_person_nid String 735998
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 Texas A&M, Galveston
attribute NC_GLOBAL people_1_affiliation_acronym String TAMUG
attribute NC_GLOBAL people_1_person_name String Antonietta Quigg
attribute NC_GLOBAL people_1_person_nid String 736000
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 Texas A&M, Galveston
attribute NC_GLOBAL people_2_affiliation_acronym String TAMUG
attribute NC_GLOBAL people_2_person_name String Kathleen Schwehr
attribute NC_GLOBAL people_2_person_nid String 736002
attribute NC_GLOBAL people_2_role String Co-Principal Investigator
attribute NC_GLOBAL people_2_role_type String originator
attribute NC_GLOBAL people_3_affiliation String Texas A&M, Galveston
attribute NC_GLOBAL people_3_affiliation_acronym String TAMUG
attribute NC_GLOBAL people_3_person_name String Chen Xu
attribute NC_GLOBAL people_3_person_nid String 736004
attribute NC_GLOBAL people_3_role String Co-Principal Investigator
attribute NC_GLOBAL people_3_role_type String originator
attribute NC_GLOBAL people_4_affiliation String Woods Hole Oceanographic Institution
attribute NC_GLOBAL people_4_affiliation_acronym String WHOI BCO-DMO
attribute NC_GLOBAL people_4_person_name String Mathew Biddle
attribute NC_GLOBAL people_4_person_nid String 708682
attribute NC_GLOBAL people_4_role String BCO-DMO Data Manager
attribute NC_GLOBAL people_4_role_type String related
attribute NC_GLOBAL project String Biopolymers for radionuclides
attribute NC_GLOBAL projects_0_acronym String Biopolymers for radionuclides
attribute NC_GLOBAL projects_0_description String NSF Award Abstract:\nParticle-associated natural radioisotopes are transported to the ocean floor mostly via silica and carbonate ballasted particles, allowing their use as tracers for particle transport. Th(IV), Pa (IV,V), Po(IV), Pb(II) and Be(II) radionuclides are important proxies in oceanographic investigations, used for tracing particle and colloid cycling, estimating export fluxes of particulate organic carbon, tracing air-sea exchange, paleoproductivity, and/or ocean circulation in paleoceanographic studies. Even though tracer approaches are considered routine, there are cases where data interpretation or validity has become controversial, largely due to uncertainties about inorganic proxies and organic carrier molecules. Recent studies showed that cleaned diatom frustules and pure silica particles, sorb natural radionuclides to a much lower extent (by 1-2 orders of magnitude) than whole diatom cells (with or without shells). Phytoplankton that build siliceous or calcareous shells, such as the diatoms and coccolithophores, are assembled via bio-mineralization processes using biopolymers as nanoscale templates. These templates could serve as possible carriers for radionuclides and stable metals.\nIn this project, a research team at the Texas A & M University at Galveston hypothesize that radionuclide sorption is controlled by selective biopolymers that are associated with biogenic opal (diatoms), CaCO3 (coccolithophores) and the attached exopolymeric substances (EPS), rather than to pure mineral phase. To pursue this idea, the major objectives of their research will include separation, identification and molecular-level characterization of the individual biopolymers (e.g., polysaccharides, uronic acids, proteins, hydroquinones, hydroxamate siderophores, etc.) that are responsible for binding different radionuclides (Th, Pa, Pb, Po and Be) attached to cells or in the matrix of biogenic opal or CaCO3 as well as attached EPS mixture, in laboratory grown diatom and coccolithophore cultures. Laboratory-scale radiolabeling experiments will be conducted, and different separation techniques and characterization techniques will be applied.\nIntellectual Merit : It is expected that this study will help elucidate the molecular basis of the templated growth of diatoms and coccoliths, EPS and their role in scavenging natural radionuclides in the ocean, and help resolve debates on the oceanographic tracer applications of different natural radioisotopes (230,234Th, 231Pa, 210Po, 210Pb and 7,10Be). The proposed interdisciplinary research project will require instrumental approaches for molecular-level characterization of these radionuclides associated carrier molecules.\nBroader Impacts: The results of this study will be relevant for understanding biologically mediated ocean scavenging of radionuclides by diatoms and coccoliths which is important for carbon cycling in the ocean, and will contribute to improved interpretation of data obtained by field studies especially through the GEOTRACES program. This new program will enhance training programs at TAMUG for postdocs, graduate and undergraduate students. Lastly, results will be integrated in college courses and out-reach activities at Texas A&M University, including NSF-REU, Sea Camp, Elder Hostel and exhibits at the local science fair and interaction with its after-school program engaging Grade 9-12 students from groups traditionally underrepresented.
attribute NC_GLOBAL projects_0_end_date String 2018-02
attribute NC_GLOBAL projects_0_name String Biopolymers as carrier phases for selected natural radionuclides (of Th, Pa, Pb, Po, Be) in diatoms and coccolithophores
attribute NC_GLOBAL projects_0_project_nid String 735996
attribute NC_GLOBAL projects_0_start_date String 2014-03
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 Laboratory studies were conducted to examine the sorption of selected radionuclides (234Th, 233Pa, 210Po, 210Pb, and 7Be) onto inorganic (pure silica and acid-cleaned diatom frustules) and organic (diatom cells with or without silica frustules) particles in natural seawater and the role of templating biomolecules and exopolymeric substances (EPS) extracted from the same species of diatom, Phaeodactylum tricornutum, in the sorption process. The range of partition coefficients (Kd, reported as logKd) of radionuclides between water and the different particle types was 4.78\\u20136.69 for 234Th, 5.23\\u20136.71 for 233Pa, 4.44\\u20135.86 for 210Pb, 4.47\\u20134.92 for 210Po, and 4.93\\u20137.23 for 7Be, similar to values reported for lab and field determinations. The sorption of all radionuclides was significantly enhanced in the presence of organic matter associated with particles, resulting in Kd one to two orders of magnitude higher than for inorganic particles only, with highest values for 7Be (logKd of 7.2). Results further indicate that EPS and frustule-embedded biomolecules in diatom cells are responsible for the sorption enhancement rather than the silica shell itself. By separating radiolabeled EPS via isoelectric focusing, we found that isoelectric points are radionuclide specific, suggesting that each radionuclide binds to specific biopolymeric functional groups, with the most efficient binding sites likely occurring in acid polysaccharides, iron hydroxides, and proteins. Further progress in evaluating the effects of diatom frustule\\u2013related biopolymers on binding, scavenging, and fractionation of radionuclides would require the application of molecular-level characterization techniques.
attribute NC_GLOBAL title String [Log_Kd] - Partition coefficient of 234Th, 233Pa, 210Pb, 210Po, and 7Be (Biopolymers as carrier phases for selected natural radionuclides (of Th, Pa, Pb, Po, Be) in diatoms and coccolithophores)
attribute NC_GLOBAL version String 1
attribute NC_GLOBAL xml_source String osprey2erddap.update_xml() v1.3
variable Particle_type String
attribute Particle_type bcodmo_name String unknown
attribute Particle_type description String radionuclide type
attribute Particle_type long_name String Particle Type
attribute Particle_type units String unitless
variable Be float
attribute Be _FillValue float NaN
attribute Be actual_range float 4.93, 7.23
attribute Be bcodmo_name String radioactive_isotope_conc
attribute Be description String activity concentration of Be as traditional partition coefficients
attribute Be long_name String Be
attribute Be nerc_identifier String https://vocab.nerc.ac.uk/collection/P02/current/WRAD/ (external link)
attribute Be units String kilogram per liter (kg/L)
variable Be_sd float
attribute Be_sd _FillValue float NaN
attribute Be_sd actual_range float 0.01, 0.11
attribute Be_sd bcodmo_name String radioactive_isotope_conc
attribute Be_sd colorBarMaximum double 50.0
attribute Be_sd colorBarMinimum double 0.0
attribute Be_sd description String Standard deviation of Be activity concentration as traditional partition coefficients
attribute Be_sd long_name String Be Sd
attribute Be_sd nerc_identifier String https://vocab.nerc.ac.uk/collection/P02/current/WRAD/ (external link)
attribute Be_sd units String kilogram per liter (kg/L)
variable Pa float
attribute Pa _FillValue float NaN
attribute Pa actual_range float 5.23, 6.71
attribute Pa bcodmo_name String radioactive_isotope_conc
attribute Pa description String activity concentration of Pa as traditional partition coefficients
attribute Pa long_name String Pa
attribute Pa nerc_identifier String https://vocab.nerc.ac.uk/collection/P02/current/WRAD/ (external link)
attribute Pa units String kilogram per liter (kg/L)
variable Pa_sd float
attribute Pa_sd _FillValue float NaN
attribute Pa_sd actual_range float 0.0, 0.16
attribute Pa_sd bcodmo_name String radioactive_isotope_conc
attribute Pa_sd colorBarMaximum double 50.0
attribute Pa_sd colorBarMinimum double 0.0
attribute Pa_sd description String Standard deviation of Pa activity concentration as traditional partition coefficients
attribute Pa_sd long_name String Pa Sd
attribute Pa_sd nerc_identifier String https://vocab.nerc.ac.uk/collection/P02/current/WRAD/ (external link)
attribute Pa_sd units String kilogram per liter (kg/L)
variable Th float
attribute Th _FillValue float NaN
attribute Th actual_range float 4.78, 6.69
attribute Th bcodmo_name String radioactive_isotope_conc
attribute Th description String activity concentration of Th as traditional partition coefficients
attribute Th long_name String TH
attribute Th nerc_identifier String https://vocab.nerc.ac.uk/collection/P02/current/WRAD/ (external link)
attribute Th units String kilogram per liter (kg/L)
variable Th_sd float
attribute Th_sd _FillValue float NaN
attribute Th_sd actual_range float 0.01, 0.17
attribute Th_sd bcodmo_name String radioactive_isotope_conc
attribute Th_sd colorBarMaximum double 50.0
attribute Th_sd colorBarMinimum double 0.0
attribute Th_sd description String Standard deviation of Th activity concentration as traditional partition coefficients
attribute Th_sd long_name String TH SD
attribute Th_sd nerc_identifier String https://vocab.nerc.ac.uk/collection/P02/current/WRAD/ (external link)
attribute Th_sd units String kilogram per liter (kg/L)
variable Po float
attribute Po _FillValue float NaN
attribute Po actual_range float 4.47, 4.92
attribute Po bcodmo_name String radioactive_isotope_conc
attribute Po description String activity concentration of Po as traditional partition coefficients
attribute Po long_name String Po
attribute Po nerc_identifier String https://vocab.nerc.ac.uk/collection/P02/current/WRAD/ (external link)
attribute Po units String kilogram per liter (kg/L)
variable Po_sd float
attribute Po_sd _FillValue float NaN
attribute Po_sd actual_range float 0.01, 0.11
attribute Po_sd bcodmo_name String radioactive_isotope_conc
attribute Po_sd colorBarMaximum double 50.0
attribute Po_sd colorBarMinimum double 0.0
attribute Po_sd description String Standard deviation of Po activity concentration as traditional partition coefficients
attribute Po_sd long_name String Po Sd
attribute Po_sd nerc_identifier String https://vocab.nerc.ac.uk/collection/P02/current/WRAD/ (external link)
attribute Po_sd units String kilogram per liter (kg/L)
variable Pb float
attribute Pb _FillValue float NaN
attribute Pb actual_range float 4.44, 5.86
attribute Pb bcodmo_name String radioactive_isotope_conc
attribute Pb description String activity concentration of Pb as traditional partition coefficients
attribute Pb long_name String PB
attribute Pb nerc_identifier String https://vocab.nerc.ac.uk/collection/P02/current/WRAD/ (external link)
attribute Pb units String kilogram per liter (kg/L)
variable Pb_sd float
attribute Pb_sd _FillValue float NaN
attribute Pb_sd actual_range float 0.03, 0.13
attribute Pb_sd bcodmo_name String radioactive_isotope_conc
attribute Pb_sd colorBarMaximum double 50.0
attribute Pb_sd colorBarMinimum double 0.0
attribute Pb_sd description String Standard deviation of Pb activity concentration as traditional partition coefficients
attribute Pb_sd long_name String PB SD
attribute Pb_sd nerc_identifier String https://vocab.nerc.ac.uk/collection/P02/current/WRAD/ (external link)
attribute Pb_sd units String kilogram per liter (kg/L)

 
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