Attributes {
 s {
  Replicate {
    Byte _FillValue 127;
    String _Unsigned "false";
    Byte actual_range 1, 3;
    String bcodmo_name "replicate";
    String description "Replicate of an individual sample";
    String long_name "Replicate";
    String units "unitless";
  }
  Sample_Name {
    String bcodmo_name "sample";
    String description "Sample name";
    String long_name "Sample Name";
    String nerc_identifier "https://vocab.nerc.ac.uk/collection/P02/current/ACYC/";
    String units "unitless";
  }
  Peak_Concentration {
    Float32 _FillValue NaN;
    Float32 actual_range 9.82, 72.96;
    String bcodmo_name "PO4";
    String description "Phosphate concentration (uncorrected)";
    String long_name "Peak Concentration";
    String units "micromolar (uM)";
  }
  Actual_PO4 {
    Float32 _FillValue NaN;
    Float32 actual_range 226.26, 1872.0;
    String bcodmo_name "PO4";
    String description "Phosphate concentration corrected for dilution";
    String long_name "Mass Concentration Of Phosphate In Sea Water";
    String units "micromolar (uM)";
  }
  umol_PO4 {
    Float32 _FillValue NaN;
    Float32 actual_range 2.26, 18.72;
    String bcodmo_name "P";
    String description "Amount of phosphorus extracted";
    String long_name "Mass Concentration Of Phosphate In Sea Water";
    String units "micromoles (umol)";
  }
  Sediment_mass {
    Float32 _FillValue NaN;
    Float32 actual_range 0.1, 0.1;
    String bcodmo_name "weight";
    String description "Dried sediment mass";
    String long_name "Sediment Mass";
    String units "grams (g)";
  }
  umol_PO4_per_g {
    Float32 _FillValue NaN;
    Float32 actual_range 22.58, 187.01;
    String bcodmo_name "P";
    String description "Micromoles of phosphorus per gram of sediment (ground dry weight)";
    String long_name "Mass Concentration Of Phosphate In Sea Water";
    String units "micromoles per gram (umol/g)";
  }
 }
  NC_GLOBAL {
    String access_formats ".htmlTable,.csv,.json,.mat,.nc,.tsv";
    String acquisition_description "Locations:
 
Arctic Ocean: P-1-94-AR P21, 84\\u00b05' N, 174\\u00b058' W  
 California margin: W-2-98-NC TF1, 41\\u00b05' N, 125\\u00b01' W  
 Equatorial Pacific: TT013-06MC, 12\\u00b000' S, 134\\u00b056' W
 
Methodology:
 
We used the ignition method to determine total P and molybdate-reactive P
concentrations (MRP, which includes primarily free orthophosphate) for each
sediment sample used for this study. Samples for total P analyses were ashed
in crucibles at 550oC for 2 h and then extracted in 25 mL of 0.5 M sulfuric
acid for 16 h. Samples for MRP analyses were extracted in the same manner,
without the ashing step (Olsen and Sommers 1982; Cade-Menun and Lavkulich
1997). We derived molybdate-unreactive P concentrations (MUP, which includes
primarily organic P and polyphosphates) in supernatants by subtracting MRP
from total P concentrations. For ashed and unashed extracts, MRP was
determined as described below.
 
Total P concentrations in sediment extracts were measured using inductively
coupled plasma optical emission spectroscopy (ICP-OES). Standards were
prepared with the same solutions as those used for the extraction procedure in
order to minimize matrix effects on P measurements. Sediment extracts and
standards (0 \\u03bcM, 3.2 \\u03bcM, 32 \\u03bcM and 320 \\u03bcM) were diluted to
lower salt content to prevent salt buildup on the nebulizer. Concentration
data from both wavelengths (213 nm and 214 nm) were averaged to obtain extract
concentrations for each sample. The detection limit for P on this instrument
for both wavelengths is 0.4 \\u03bcM. The MRP concentrations were measured on a
QuikChem 8000 automated ion analyzer. Standards were prepared with the same
solutions used for the extraction step to minimize matrix effects on P
measurements. Sediment extracts and standards (0 \\u2013 30 \\u03bcM PO4) were
diluted ten-fold to prevent matrix interference with color development. The
detection limit for P on this instrument is 0.2 \\u03bcM. We derived MUP
concentrations by subtracting MRP from total P concentrations.";
    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 cdm_data_type "Other";
    String comment "Sediment TP MRP MUP 
  PI: Adina Paytan 
  Data Version 1: 2020-06-23";
    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 dataset_current_state "Final and no updates";
    String date_created "2020-03-02T22:06:35Z";
    String date_modified "2020-07-02T21:02:02Z";
    String defaultDataQuery "&time<now";
    String doi "10.26008/1912/bco-dmo.805206.1";
    String history "2024-11-15T12:08:34Z (local files)
2024-11-15T12:08:34Z https://erddap.bco-dmo.org/erddap/tabledap/bcodmo_dataset_805206.das";
    String infoUrl "https://www.bco-dmo.org/dataset/805206";
    String institution "BCO-DMO";
    String instruments_0_acronym "FIA";
    String instruments_0_dataset_instrument_nid "805215";
    String instruments_0_description "An instrument that performs flow injection analysis. Flow injection analysis (FIA) is an approach to chemical analysis that is accomplished by injecting a plug of sample into a flowing carrier stream. FIA is an automated method in which a sample is injected into a continuous flow of a carrier solution that mixes with other continuously flowing solutions before reaching a detector. Precision is dramatically increased when FIA is used instead of manual injections and as a result very specific FIA systems have been developed for a wide array of analytical techniques.";
    String instruments_0_instrument_external_identifier "https://vocab.nerc.ac.uk/collection/L05/current/LAB36/";
    String instruments_0_instrument_name "Flow Injection Analyzer";
    String instruments_0_instrument_nid "657";
    String instruments_0_supplied_name "QuikChem 8000 automated ion analyzer";
    String keywords "Actual_PO4, bco, bco-dmo, biological, chemical, chemistry, concentration, data, dataset, dmo, earth, Earth Science > Oceans > Ocean Chemistry > Phosphate, erddap, management, mass, mass_concentration_of_phosphate_in_sea_water, name, ocean, oceanography, oceans, office, peak, Peak_Concentration, phosphate, po4, preliminary, replicate, sample, Sample_Name, science, sea, seawater, sediment, Sediment_mass, umol_PO4, umol_PO4_per_g, water";
    String keywords_vocabulary "GCMD Science Keywords";
    String license "https://www.bco-dmo.org/dataset/805206/license";
    String metadata_source "https://www.bco-dmo.org/api/dataset/805206";
    String param_mapping "{'805206': {}}";
    String parameter_source "https://www.bco-dmo.org/mapserver/dataset/805206/parameters";
    String people_0_affiliation "University of California-Santa Cruz";
    String people_0_affiliation_acronym "UC Santa Cruz";
    String people_0_person_name "Adina Paytan";
    String people_0_person_nid "50821";
    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 "Dr Delphine Defforey";
    String people_1_person_nid "664058";
    String people_1_role "Co-Principal Investigator";
    String people_1_role_type "originator";
    String people_2_affiliation "Woods Hole Oceanographic Institution";
    String people_2_affiliation_acronym "WHOI BCO-DMO";
    String people_2_person_name "Amber D. York";
    String people_2_person_nid "643627";
    String people_2_role "BCO-DMO Data Manager";
    String people_2_role_type "related";
    String project "Marine Sediment Analysis 31P NMR";
    String projects_0_acronym "Marine Sediment Analysis 31P NMR";
    String projects_0_description "We developed and tested a new approach to prepare marine sediment samples for solution 31P nuclear magnetic resonance spectroscopy (31P NMR). This approach addresses the effects of sample pretreatment on sedimentary P composition and increases the signal of low abundance P species in 31P NMR spectra by removing up the majority inorganic P  from sediment samples while causing minimal alteration of the chemical structure of organic P compounds. The method was tested on natural marine sediment samples from different localities (Equatorial Pacific, California Margin and Arctic Ocean) with high inorganic P content, and allowed for the detection of low abundance P forms in samples for which only an orthophosphate signal could be resolved with an NaOH-EDTA extraction alone. This new approach will allow the use of 31P NMR on samples for which low organic P concentrations previously hindered the use of this tool, and will help answer longstanding question regarding the fate of organic P in marine sediments. We developed and tested a new approach to prepare marine sediment samples for solution 31P nuclear magnetic resonance spectroscopy (31P NMR). This approach addresses the effects of sample pretreatment on sedimentary P composition and increases the signal of low abundance P species in 31P NMR spectra by removing up the majority inorganic P  from sediment samples while causing minimal alteration of the chemical structure of organic P compounds. The method was tested on natural marine sediment samples from different localities (Equatorial Pacific, California Margin and Arctic Ocean) with high inorganic P content, and allowed for the detection of low abundance P forms in samples for which only an orthophosphate signal could be resolved with an NaOH-EDTA extraction alone. This new approach will allow the use of 31P NMR on samples for which low organic P concentrations previously hindered the use of this tool, and will help answer longstanding question regarding the fate of organic P in marine sediments. 
NSF C-DEBI Award #156246 to Dr. Adina Paytan
NSF C-DEBI Award #157598 to Dr. Delphine Defforey";
    String projects_0_geolocation "Equatorial Pacific, California Margin, Arctic Ocean";
    String projects_0_name "A new marine sediment sample preparation scheme for  solution 31P NMR analysis";
    String projects_0_project_nid "664054";
    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 subsetVariables "Sediment_mass";
    String summary "Total molybdate reactive and unreactive phosphorus concentrations from sediment extracts from sediment samples collected during cruises in the Arctic Ocean, California Margin, and Equatorial Pacific from 1992-1998.";
    String title "[Sediment TP MRP MUP] - Total molybdate reactive and unreactive phosphorus concentrations from sediment extracts from sediment samples collected during cruises in the Arctic Ocean, California Margin, and Equatorial Pacific from 1992-1998 (A new marine sediment sample preparation scheme for  solution 31P NMR analysis)";
    String version "1";
    String xml_source "osprey2erddap.update_xml() v1.5";
  }
}