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Dataset Title:  Dissolved organic matter (DOM) and base-extracted particulate organic
matter (BEPOM) collected from a plankton senescence experiment from water
samples offshore of North Carolina
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Institution:  BCO-DMO   (Dataset ID: bcodmo_dataset_773802)
Information:  Summary ? | License ? | ISO 19115 | Metadata | Background (external link) | Files | Make a graph
 
Variable ?   Optional
Constraint #1 ?
Optional
Constraint #2 ?
   Minimum ?
 
   Maximum ?
 
 sample_id (unitless) ?          "NASW0001"    "OFF0024"
 sample_date (unitless) ?          "2016-11-15"    "2017-01-16"
 days (unitless) ?          0    62
 growth (unitless) ?          "Degradation"    "Stationary"
 label_time_rep (unitless) ?          "Open water sample ..."    "T3; WW3"
 bottle_nr (unitless) ?          "10"    "NaN"
 raw_invivo_flu (arbitrary) ?          15.8    41835.8
 bact_abund (cells per mL) ?          80168    2846820
 doc (micromoles per Liter (umol/L)) ?          90    355
 dom_b (quinine sulfate units) ?          0.247    2.252
 dom_t (quinine sulfate units) ?          0.161    5.053
 dom_a (quinine sulfate units) ?          0.114    3.512
 dom_c (quinine sulfate units) ?          0.036    1.836
 dom_m (quinine sulfate units) ?          0.06    1.352
 dom_n (quinine sulfate units) ?          0.07    4.148
 dom_bix (unitless) ?          0.595    1.589
 dom_hix (unitless) ?          0.376    3.068
 dom_a254 (inverse meters) ?          1.165    19.038
 dom_a300 (inverse meters) ?          0.357    10.057
 dom_a320 (inverse meters) ?          0.174    5.88
 dom_slope (inverse micrometer) ?          3.393    53.844
 dom_S275_295 (inverse nanometer) ?          -0.033    0.0
 dom_S350_400 (inverse nanometer) ?          -0.069    -0.002
 dom_SR (unitless) ?          -0.005    18.722
 BEPOC (micromoles per Liter (umol/L)) ?          0.086    168.854
 bepom_b (quinine sulfate units) ?          0.0    3.516
 bepom_t (quinine sulfate units) ?          0.006    4.99
 bepom_a (quinine sulfate units) ?          0.006    1.436
 bepom_c (quinine sulfate units) ?          0.003    0.733
 bepom_m (quinine sulfate units) ?          0.006    1.183
 bepom_n (quinine sulfate units) ?          0.005    4.036
 bepom_bix (unitless) ?          0.415    8.848
 bepom_hix (unitless) ?          0.116    2.464
 bepom_a254 (inverse meters) ?          0.023    6.912
 bepom_a300 (inverse meters) ?          0.0    2.747
 bepom_a320 (inverse meters) ?          0.0    2.221
 bepom_slope (inverse micrometer) ?          3.698    34.837
 bepom_S275_295 (inverse nanometer) ?          -0.367    0.03
 bepom_S350_400 (inverse nanometer) ?          -0.053    0.048
 bepom_SR (unitless) ?          -29.481    72.651
 
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The Dataset Attribute Structure (.das) for this Dataset

Attributes {
 s {
  sample_id {
    String bcodmo_name "sample";
    String description "Sample ID";
    String long_name "Sample Id";
    String nerc_identifier "https://vocab.nerc.ac.uk/collection/P02/current/ACYC/";
    String units "unitless";
  }
  sample_date {
    String bcodmo_name "date";
    String description "Date sample measured";
    String long_name "Sample Date";
    String nerc_identifier "https://vocab.nerc.ac.uk/collection/P01/current/ADATAA01/";
    String source_name "sample_date";
    String time_precision "1970-01-01";
    String units "unitless";
  }
  days {
    Byte _FillValue 127;
    Byte actual_range 0, 62;
    String bcodmo_name "days";
    String description "Days of incubation in day-month-year";
    String long_name "Days";
    String units "unitless";
  }
  growth {
    String bcodmo_name "unknown";
    String description "Time point of experiment";
    String long_name "Growth";
    String units "unitless";
  }
  label_time_rep {
    String bcodmo_name "unknown";
    String description "Extra sample information";
    String long_name "Label Time Rep";
    String units "unitless";
  }
  bottle_nr {
    String bcodmo_name "bot";
    String description "Incubation bottle number";
    String long_name "Bottle Nr";
    String units "unitless";
  }
  raw_invivo_flu {
    Float32 _FillValue NaN;
    Float32 actual_range 15.8, 41835.8;
    String bcodmo_name "fluorescence";
    String description "Raw in vivo fluorescence";
    String long_name "Raw Invivo Flu";
    String nerc_identifier "https://vocab.nerc.ac.uk/collection/P01/current/CPHLPM01/";
    String units "arbitrary";
  }
  bact_abund {
    Int32 _FillValue 2147483647;
    Int32 actual_range 80168, 2846820;
    String bcodmo_name "abundance";
    String description "Bacteria Abundance";
    String long_name "Bact Abund";
    String nerc_identifier "https://vocab.nerc.ac.uk/collection/P03/current/B070/";
    String units "cells per mL";
  }
  doc {
    Int16 _FillValue 32767;
    Int16 actual_range 90, 355;
    String bcodmo_name "DOC";
    String description "dissolved organic carbon";
    String long_name "Doc";
    String nerc_identifier "https://vocab.nerc.ac.uk/collection/P01/current/CORGZZZX/";
    String units "micromoles per Liter (umol/L)";
  }
  dom_b {
    Float32 _FillValue NaN;
    Float32 actual_range 0.247, 2.252;
    String bcodmo_name "fluorescence";
    String description "DOM fluorescence peak B";
    String long_name "Dom B";
    String nerc_identifier "https://vocab.nerc.ac.uk/collection/P01/current/CPHLPM01/";
    String units "quinine sulfate units";
  }
  dom_t {
    Float32 _FillValue NaN;
    Float32 actual_range 0.161, 5.053;
    String bcodmo_name "fluorescence";
    String description "DOM fluorescence peak T";
    String long_name "Dom T";
    String nerc_identifier "https://vocab.nerc.ac.uk/collection/P01/current/CPHLPM01/";
    String units "quinine sulfate units";
  }
  dom_a {
    Float32 _FillValue NaN;
    Float32 actual_range 0.114, 3.512;
    String bcodmo_name "fluorescence";
    String description "DOM fluorescence peak A";
    String long_name "Dom A";
    String nerc_identifier "https://vocab.nerc.ac.uk/collection/P01/current/CPHLPM01/";
    String units "quinine sulfate units";
  }
  dom_c {
    Float32 _FillValue NaN;
    Float32 actual_range 0.036, 1.836;
    String bcodmo_name "fluorescence";
    String description "DOM fluorescence peak C";
    String long_name "Dom C";
    String nerc_identifier "https://vocab.nerc.ac.uk/collection/P01/current/CPHLPM01/";
    String units "quinine sulfate units";
  }
  dom_m {
    Float32 _FillValue NaN;
    Float32 actual_range 0.06, 1.352;
    String bcodmo_name "fluorescence";
    String description "DOM fluorescence peak M";
    String long_name "Dom M";
    String nerc_identifier "https://vocab.nerc.ac.uk/collection/P01/current/CPHLPM01/";
    String units "quinine sulfate units";
  }
  dom_n {
    Float32 _FillValue NaN;
    Float32 actual_range 0.07, 4.148;
    String bcodmo_name "fluorescence";
    String description "DOM fluorescence peak N";
    String long_name "Dom N";
    String nerc_identifier "https://vocab.nerc.ac.uk/collection/P01/current/CPHLPM01/";
    String units "quinine sulfate units";
  }
  dom_bix {
    Float32 _FillValue NaN;
    Float32 actual_range 0.595, 1.589;
    String bcodmo_name "unknown";
    String description "Biological index";
    String long_name "Dom Bix";
    String units "unitless";
  }
  dom_hix {
    Float32 _FillValue NaN;
    Float32 actual_range 0.376, 3.068;
    String bcodmo_name "unknown";
    String description "Humificaiton index";
    String long_name "Dom Hix";
    String units "unitless";
  }
  dom_a254 {
    Float32 _FillValue NaN;
    Float32 actual_range 1.165, 19.038;
    String bcodmo_name "absorption coefficient";
    String description "DOM absorption coefficient at 254 nm";
    String long_name "Dom A254";
    String units "inverse meters";
  }
  dom_a300 {
    Float32 _FillValue NaN;
    Float32 actual_range 0.357, 10.057;
    String bcodmo_name "absorption coefficient";
    String description "DOM absorption coefficient at 300 nm";
    String long_name "Dom A300";
    String units "inverse meters";
  }
  dom_a320 {
    Float32 _FillValue NaN;
    Float32 actual_range 0.174, 5.88;
    String bcodmo_name "absorption coefficient";
    String description "DOM absorption coefficient at 320 nm";
    String long_name "Dom A320";
    String units "inverse meters";
  }
  dom_slope {
    Float32 _FillValue NaN;
    Float32 actual_range 3.393, 53.844;
    String bcodmo_name "absorption coefficient";
    String description "Slope of DOM absorption from 300 to 650 nm";
    String long_name "Dom Slope";
    String units "inverse micrometer";
  }
  dom_S275_295 {
    Float32 _FillValue NaN;
    Float32 actual_range -0.033, 0.0;
    String bcodmo_name "absorption coefficient";
    String description "Slope of DOM absorption from 275 to 295 nm";
    String long_name "Dom S275 295";
    String units "inverse nanometer";
  }
  dom_S350_400 {
    Float32 _FillValue NaN;
    Float32 actual_range -0.069, -0.002;
    String bcodmo_name "absorption coefficient";
    String description "Slope of DOM absorption from 350 to 400 nm";
    String long_name "Dom S350 400";
    String units "inverse nanometer";
  }
  dom_SR {
    Float32 _FillValue NaN;
    Float32 actual_range -0.005, 18.722;
    String bcodmo_name "unknown";
    String description "Ratio of S275-295 to S350-400";
    String long_name "Dom SR";
    String units "unitless";
  }
  BEPOC {
    Float32 _FillValue NaN;
    Float32 actual_range 0.086, 168.854;
    String bcodmo_name "POC";
    String description "base-extracted POC concentration";
    String long_name "BEPOC";
    String nerc_identifier "https://vocab.nerc.ac.uk/collection/P01/current/CORGCAP1/";
    String units "micromoles per Liter (umol/L)";
  }
  bepom_b {
    Float32 _FillValue NaN;
    Float32 actual_range 0.0, 3.516;
    String bcodmo_name "fluorescence";
    String description "BEPOM fluorescence peak B";
    String long_name "Bepom B";
    String nerc_identifier "https://vocab.nerc.ac.uk/collection/P01/current/CPHLPM01/";
    String units "quinine sulfate units";
  }
  bepom_t {
    Float32 _FillValue NaN;
    Float32 actual_range 0.006, 4.99;
    String bcodmo_name "fluorescence";
    String description "BEPOM fluorescence peak T";
    String long_name "Bepom T";
    String nerc_identifier "https://vocab.nerc.ac.uk/collection/P01/current/CPHLPM01/";
    String units "quinine sulfate units";
  }
  bepom_a {
    Float32 _FillValue NaN;
    Float32 actual_range 0.006, 1.436;
    String bcodmo_name "fluorescence";
    String description "BEPOM fluorescence peak A";
    String long_name "Bepom A";
    String nerc_identifier "https://vocab.nerc.ac.uk/collection/P01/current/CPHLPM01/";
    String units "quinine sulfate units";
  }
  bepom_c {
    Float32 _FillValue NaN;
    Float32 actual_range 0.003, 0.733;
    String bcodmo_name "fluorescence";
    String description "BEPOM fluorescence peak C";
    String long_name "Bepom C";
    String nerc_identifier "https://vocab.nerc.ac.uk/collection/P01/current/CPHLPM01/";
    String units "quinine sulfate units";
  }
  bepom_m {
    Float32 _FillValue NaN;
    Float32 actual_range 0.006, 1.183;
    String bcodmo_name "fluorescence";
    String description "BEPOM fluorescence peak M";
    String long_name "Bepom M";
    String nerc_identifier "https://vocab.nerc.ac.uk/collection/P01/current/CPHLPM01/";
    String units "quinine sulfate units";
  }
  bepom_n {
    Float32 _FillValue NaN;
    Float32 actual_range 0.005, 4.036;
    String bcodmo_name "fluorescence";
    String description "BEPOM fluorescence peak N";
    String long_name "Bepom N";
    String nerc_identifier "https://vocab.nerc.ac.uk/collection/P01/current/CPHLPM01/";
    String units "quinine sulfate units";
  }
  bepom_bix {
    Float32 _FillValue NaN;
    Float32 actual_range 0.415, 8.848;
    String bcodmo_name "unknown";
    String description "Biological index";
    String long_name "Bepom Bix";
    String units "unitless";
  }
  bepom_hix {
    Float32 _FillValue NaN;
    Float32 actual_range 0.116, 2.464;
    String bcodmo_name "unknown";
    String description "Humificaiton index";
    String long_name "Bepom Hix";
    String units "unitless";
  }
  bepom_a254 {
    Float32 _FillValue NaN;
    Float32 actual_range 0.023, 6.912;
    String bcodmo_name "absorption coefficient";
    String description "BEPOM absorption coefficient at 254 nm";
    String long_name "Bepom A254";
    String units "inverse meters";
  }
  bepom_a300 {
    Float32 _FillValue NaN;
    Float32 actual_range 0.0, 2.747;
    String bcodmo_name "absorption coefficient";
    String description "BEPOM absorption coefficient at 300 nm";
    String long_name "Bepom A300";
    String units "inverse meters";
  }
  bepom_a320 {
    Float32 _FillValue NaN;
    Float32 actual_range 0.0, 2.221;
    String bcodmo_name "absorption coefficient";
    String description "BEPOM absorption coefficient at 320 nm";
    String long_name "Bepom A320";
    String units "inverse meters";
  }
  bepom_slope {
    Float32 _FillValue NaN;
    Float32 actual_range 3.698, 34.837;
    String bcodmo_name "absorption coefficient";
    String description "Slope of BEPOM absorption from 300 to 650 nm";
    String long_name "Bepom Slope";
    String units "inverse micrometer";
  }
  bepom_S275_295 {
    Float32 _FillValue NaN;
    Float32 actual_range -0.367, 0.03;
    String bcodmo_name "absorption coefficient";
    String description "Slope of BEPOM absorption from 275 to 295 nm";
    String long_name "Bepom S275 295";
    String units "inverse nanometer";
  }
  bepom_S350_400 {
    Float32 _FillValue NaN;
    Float32 actual_range -0.053, 0.048;
    String bcodmo_name "absorption coefficient";
    String description "Slope of BEPOM absorption from 350 to 400 nm";
    String long_name "Bepom S350 400";
    String units "inverse nanometer";
  }
  bepom_SR {
    Float32 _FillValue NaN;
    Float32 actual_range -29.481, 72.651;
    String bcodmo_name "unknown";
    String description "Ratio of S275-295 to S350-400";
    String long_name "Bepom SR";
    String units "unitless";
  }
 }
  NC_GLOBAL {
    String access_formats ".htmlTable,.csv,.json,.mat,.nc,.tsv";
    String acquisition_description 
"Inoculated bottles and seawater controls (medium without cells) were grown on
a Wheaton roller apparatus rotating at ~1 rpm (Kinsey et al. 2018; Osburn et
al. 2019) and maintained at 19 \\u00b0C with a 12:12 light:dark cycle at ~90
\\u03bcEs m\\u22122 s\\u22121 under cool-white fluorescent light in a growth
incubator (Percival Scientific, Iowa). The algal assemblages reached
stationary phase within ~20 days with cell densities at approximately 30,000
cells mL\\u22121 with an average specific growth rate of 0.5. Changes in cell
densities (mL\\u22121) were based on microscopical cell counts (Olympus BX53)
to monitor algal growth after preservation with acid Lugol's solution (5%) and
settling varied volumes depending on growth phase. The remaining bottles were
placed in the dark for 60 days of degradation to simulate transport of POM
from surface waters to the mesopelagic ocean.\\u00a0
 
Sample aliquots were gently vacuum filtered through pre-combusted (450
\\u00b0C, minimum 6 h) GF/F filters to collect particles for base extraction.
The filtrate was collected in polycarbonate bottles for optical measurements
and in pre-combusted borosilicate vials for DOC analysis. POM collected on
GF/F filters was base-extracted with 0.1 M sodium hydroxide (NaOH) as
described in Kinsey et al. (2018). DOC and base-extracted particulate organic
carbon (from BEPOM solutions) were prepared and analyzed using an OI
Analytical 1030D TOC analyzer as described in Kinsey et al. (2018). Limit of
detection of this measurement was 0.11 mg C L-1; precision on standards
(including the Hansell Deep Sea Reference material) was \\u00b1 0.04 mg C
L\\u22121.
 
Sodium borohydride (NaBH4) was used to reduce carbonyl groups (aldehydes,
ketones) to their corresponding alcohols (Schendorf et al., 2016). CDOM and
BEPOM samples from stationary and degradation stages were treated with 25-mass
excess of NaBH4 (i.e., 15 mol borohydride per mole C per sample), using a
basified 1M NaBH4 stock solution, and sparged with ultra-high purity argon gas
for 24 h. Following reduction, samples were neutralized to their original pH
and analyzed for absorbance and fluorescence as described below. For
comparison, 2 mg C L\\u22121 and 4 mg C L\\u22121 samples of both SRFA (Lot
1R101F) and PLFA (Lot 1R109F) were prepared in MilliQ water. Optical
measurements were taken before and after NaBH4 reduction for all samples.
 
Absorbance and fluorescence was measured from 200 to 800 nm on a Horiba
Aqualog fluorescence spectrophotometer in 1 cm quartz cells (Starna Cells,
Inc.). MilliQ water or a neutralized NaOH solution was used as a blank for
initial DOM and BEPOM optical measurements, respectively. MilliQ water treated
with NaBH4 was used as a blank following NaBH4 reduction. After blank
subtraction, absorbance values (A\\u03bb) were then converted to Napierian
absorption coefficients (a\\u03bb) (Green and Blough, 1994).";
    String awards_0_award_nid "734586";
    String awards_0_award_number "OCE-1547976";
    String awards_0_data_url "http://www.nsf.gov/awardsearch/showAward.do?AwardNumber=1547976";
    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 "Henrietta N Edmonds";
    String awards_0_program_manager_nid "51517";
    String awards_1_award_nid "734588";
    String awards_1_award_number "OCE-1459406";
    String awards_1_data_url "http://www.nsf.gov/awardsearch/showAward.do?AwardNumber=1459406";
    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 "Henrietta N Edmonds";
    String awards_1_program_manager_nid "51517";
    String awards_2_award_nid "734592";
    String awards_2_award_number "OCE-1459294";
    String awards_2_data_url "http://www.nsf.gov/awardsearch/showAward.do?AwardNumber=1459294";
    String awards_2_funder_name "NSF Division of Ocean Sciences";
    String awards_2_funding_acronym "NSF OCE";
    String awards_2_funding_source_nid "355";
    String awards_2_program_manager "Henrietta N Edmonds";
    String awards_2_program_manager_nid "51517";
    String cdm_data_type "Other";
    String comment 
"DOM and BEPOM collected from a plankton senescence experiment 
  PI: Christopher L. Osburn 
  Version: 2019-07-30";
    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 "2019-07-30T18:04:30Z";
    String date_modified "2019-08-01T15:23:11Z";
    String defaultDataQuery "&time<now";
    String doi "10.1575/1912/bco-dmo.773802.1";
    String history 
"2021-10-16T02:07:51Z (local files)
2021-10-16T02:07:51Z https://erddap.bco-dmo.org/erddap/tabledap/bcodmo_dataset_773802.html";
    String infoUrl "https://www.bco-dmo.org/dataset/773802";
    String institution "BCO-DMO";
    String instruments_0_acronym "TOC analyzer";
    String instruments_0_dataset_instrument_description "OI Analytical Aurora 1030 W Total Organic Carbon (TOC) Analyzer: DOC & DIC. Calibrated with stock solutions of sodium bicarbonate (DIC) and caffeine (DOC). A certified reference material (CRM) for DIC is analyzed regularly as a check standard.";
    String instruments_0_dataset_instrument_nid "773854";
    String instruments_0_description "A unit that accurately determines the carbon concentrations of organic compounds typically by detecting and measuring its combustion product (CO2). See description document at: http://bcodata.whoi.edu/LaurentianGreatLakes_Chemistry/bs116.pdf";
    String instruments_0_instrument_external_identifier "https://vocab.nerc.ac.uk/collection/L05/current/LAB04/";
    String instruments_0_instrument_name "Total Organic Carbon Analyzer";
    String instruments_0_instrument_nid "652";
    String instruments_0_supplied_name "OI Analytical Aurora 1030 W Total Organic Carbon (TOC) Analyzer";
    String instruments_1_acronym "Spectrometer";
    String instruments_1_dataset_instrument_description "Horiba Aqualog Fluorescence Spectrometer, absorbance and fluorescence. Calibrated with quinine sulfate solution after normalization to instrument’s water Raman peak. Fluorescence corrected for water blank, inner filtering effects.";
    String instruments_1_dataset_instrument_nid "773853";
    String instruments_1_description "A spectrometer is an optical instrument used to measure properties of light over a specific portion of the electromagnetic spectrum.";
    String instruments_1_instrument_external_identifier "https://vocab.nerc.ac.uk/collection/L22/current/TOOL0460/";
    String instruments_1_instrument_name "Spectrometer";
    String instruments_1_instrument_nid "667";
    String instruments_1_supplied_name "Horiba Aqualog Fluorescence Spectrometer";
    String keywords "a254, a300, a320, abund, bact, bact_abund, bco, bco-dmo, bepoc, bepom, bepom_a, bepom_a254, bepom_a300, bepom_a320, bepom_b, bepom_bix, bepom_c, bepom_hix, bepom_m, bepom_n, bepom_S275_295, bepom_S350_400, bepom_slope, bepom_SR, bepom_t, biological, bix, bottle, bottle_nr, chemical, commerce, data, dataset, date, days, department, dmo, doc, dom, dom_a, dom_a254, dom_a300, dom_a320, dom_b, dom_bix, dom_c, dom_hix, dom_m, dom_n, dom_S275_295, dom_S350_400, dom_slope, dom_SR, dom_t, erddap, flu, growth, hix, invivo, label, label_time_rep, management, oceanography, office, preliminary, raw, raw_invivo_flu, rep, s275, s350, sample, sample_id, slope, time";
    String license "https://www.bco-dmo.org/dataset/773802/license";
    String metadata_source "https://www.bco-dmo.org/api/dataset/773802";
    String param_mapping "{'773802': {}}";
    String parameter_source "https://www.bco-dmo.org/mapserver/dataset/773802/parameters";
    String people_0_affiliation "North Carolina State University";
    String people_0_affiliation_acronym "NCSU";
    String people_0_person_name "Chris Osburn";
    String people_0_person_nid "51123";
    String people_0_role "Principal Investigator";
    String people_0_role_type "originator";
    String people_1_affiliation "University of Florida";
    String people_1_affiliation_acronym "UF";
    String people_1_person_name "Thomas Bianchi";
    String people_1_person_nid "51156";
    String people_1_role "Co-Principal Investigator";
    String people_1_role_type "originator";
    String people_2_affiliation "North Carolina State University";
    String people_2_affiliation_acronym "NCSU";
    String people_2_person_name "Astrid Schnetzer";
    String people_2_person_nid "51599";
    String people_2_role "Co-Principal Investigator";
    String people_2_role_type "originator";
    String people_3_affiliation "University of New Hampshire";
    String people_3_affiliation_acronym "UNH";
    String people_3_person_name "Kai Ziervogel";
    String people_3_person_nid "734583";
    String people_3_role "Co-Principal Investigator";
    String people_3_role_type "originator";
    String people_4_affiliation "Woods Hole Oceanographic Institution";
    String people_4_affiliation_acronym "WHOI BCO-DMO";
    String people_4_person_name "Mathew Biddle";
    String people_4_person_nid "708682";
    String people_4_role "BCO-DMO Data Manager";
    String people_4_role_type "related";
    String project "PlankDOM";
    String projects_0_acronym "PlankDOM";
    String projects_0_description 
"NSF abstract:
Chromophoric dissolved organic matter (CDOM) is a small but important fraction of the marine carbon pool that interacts with solar radiation and thus affects many photochemical and biological processes in the ocean. Despite its importance, the chemical basis for the formation of oceanic CDOM remains unclear. CDOM may be formed from two possible sources: 1) heterotrophic bacterial transformations of primary productivity (plankton-derived), or 2) terrestrially-derived. This project will examine the role of phytoplankton as a source of CDOM in the ocean by utilizing a powerful, new technique to measure particulate organic matter absorbance and fluorescence, discrete chemical measurements of probable precursors to planktonic CDOM, and enzymatic assays. Results of this research will provide new insights into the origin and production of planktonic CDOM and its transformation by heterotrophic bacteria. This research on CDOM will be shared broadly through a module at a North Carolina Aquarium, and streaming live feeds of shipboard activities to elementary school classrooms.
Terrestrial and oceanic dissolved organic matter (DOM) differ in their chemical composition. Laboratory and open-ocean observations suggest that bacterial transformation of phytoplankton DOM produces humic-like CDOM signals that are visually similar to those in terrestrial CDOM. However, prior studies of oceanic CDOM using absorbance and fluorescence fit an electronic interaction (EI) model of intramolecular charge transfer (CT) reactions between donor and acceptor molecules common to partially-oxidized terrestrial molecules found in humic substances. This project will test the hypothesis that phytoplankton and bacteria provide a source of donors and acceptors that are microbially-transformed and linked, enabling CT contacts between them and creating oceanic CDOM. To address this, researchers will systematically study phytoplankton growth, including marine snow formation. A new technique for measuring base-extracted POM (BEPOM) absorbance and fluorescence will be used to incorporate planktonic CDOM results into the EI model, and supplemented with measurements of its probable chemical precursors. These experiments will improve understanding of how the production of CDOM in the ocean is linked to the optics and chemistry of planktonic CDOM formation. Determining the time course and extent of phytoplankton POM and DOM transformation by heterotrophic bacteria during the same phytoplankton growth experiments will provide an in-depth understanding as to how bacterial transformation of marine snow-associated planktonic organic matter drives CDOM production throughout the ocean.";
    String projects_0_end_date "2019-04";
    String projects_0_geolocation "Northern Atlantic Ocean, 34.65 N, 69.63 W";
    String projects_0_name "Collaborative Research: Planktonic Sources of Chromophoric Dissolved Organic Matter in Seawater";
    String projects_0_project_nid "734581";
    String projects_0_start_date "2015-05";
    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 "A mixed assemblage of natural phytoplankton community collected from waters offshore of North Carolina were used to create planktonic dissolved organic matter (DOM) and particulate organic matter (POM). The latter was extracted with 0.1 M NaOH to create base-extracted POM (BEPOM). Methods are reported in Kinsey et al. (2018) and Osburn et al. (2019). The medium used was: Natural Assemblage 2x filtered North Atlantic Surface water with f/2 nutrients; Whole water experiment - unfiltered North Atlantic Surface water with f/20 nutrients Irradiance ~70-100 umol photon m-2 s-1 (cool white bulbs); on roller table; diel cycle, 19 \\u00b0C";
    String title "Dissolved organic matter (DOM) and base-extracted particulate organic matter (BEPOM) collected from a plankton senescence experiment from water samples offshore of North Carolina";
    String version "1";
    String xml_source "osprey2erddap.update_xml() v1.3";
  }
}

 

Using tabledap to Request Data and Graphs from Tabular Datasets

tabledap lets you request a data subset, a graph, or a map from a tabular dataset (for example, buoy data), via a specially formed URL. tabledap uses the OPeNDAP (external link) Data Access Protocol (DAP) (external link) and its selection constraints (external link).

The URL specifies what you want: the dataset, a description of the graph or the subset of the data, and the file type for the response.

Tabledap request URLs must be in the form
https://coastwatch.pfeg.noaa.gov/erddap/tabledap/datasetID.fileType{?query}
For example,
https://coastwatch.pfeg.noaa.gov/erddap/tabledap/pmelTaoDySst.htmlTable?longitude,latitude,time,station,wmo_platform_code,T_25&time>=2015-05-23T12:00:00Z&time<=2015-05-31T12:00:00Z
Thus, the query is often a comma-separated list of desired variable names, followed by a collection of constraints (e.g., variable<value), each preceded by '&' (which is interpreted as "AND").

For details, see the tabledap Documentation.


 
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