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Dataset Title:  Noble gas concentrations and saturations from Marsh Pond in Massachusetts, USA
from 2014.
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Institution:  BCO-DMO   (Dataset ID: bcodmo_dataset_670694)
Range: longitude = -70.83127 to -70.83127°E, latitude = 42.741096 to 42.741096°N, time = 2014-07-29T05:59:00Z to 2014-08-26T15:35:00Z
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The Dataset Attribute Structure (.das) for this Dataset

Attributes {
 s {
  date {
    String bcodmo_name "date";
    String description "Sampling date; yyyy-mm-dd";
    String long_name "Date";
    String nerc_identifier "https://vocab.nerc.ac.uk/collection/P01/current/ADATAA01/";
    String time_precision "1970-01-01";
    String units "unitless";
  }
  time2 {
    String bcodmo_name "time";
    String description "Sampling time; HH:MM";
    String long_name "Time";
    String nerc_identifier "https://vocab.nerc.ac.uk/collection/P01/current/AHMSAA01/";
    String units "unitless";
  }
  time {
    String _CoordinateAxisType "Time";
    Float64 actual_range 1.40661354e+9, 1.4090673e+9;
    String axis "T";
    String bcodmo_name "diss_noble_gas_conc";
    String description "Date/Time (UTC) ISO formatted";
    String ioos_category "Time";
    String long_name "ISO Date Time UTC";
    String nerc_identifier "https://vocab.nerc.ac.uk/collection/P02/current/HEXC/";
    String source_name "ISO_DateTime_UTC";
    String standard_name "time";
    String time_origin "01-JAN-1970 00:00:00";
    String time_precision "1970-01-01T00:00:00Z";
    String units "seconds since 1970-01-01T00:00:00Z";
  }
  latitude {
    String _CoordinateAxisType "Lat";
    Float64 _FillValue NaN;
    Float64 actual_range 42.741097, 42.741097;
    String axis "Y";
    String bcodmo_name "latitude";
    Float64 colorBarMaximum 90.0;
    Float64 colorBarMinimum -90.0;
    String description "Latitude; N is positive";
    String ioos_category "Location";
    String long_name "Latitude";
    String nerc_identifier "https://vocab.nerc.ac.uk/collection/P09/current/LATX/";
    String standard_name "latitude";
    String units "degrees_north";
  }
  longitude {
    String _CoordinateAxisType "Lon";
    Float64 _FillValue NaN;
    Float64 actual_range -70.831269, -70.831269;
    String axis "X";
    String bcodmo_name "longitude";
    Float64 colorBarMaximum 180.0;
    Float64 colorBarMinimum -180.0;
    String description "Longitude; E is positive";
    String ioos_category "Location";
    String long_name "Longitude";
    String nerc_identifier "https://vocab.nerc.ac.uk/collection/P09/current/LONX/";
    String standard_name "longitude";
    String units "degrees_east";
  }
  He {
    Float32 _FillValue NaN;
    Float32 actual_range 0.0017, 0.00183;
    String bcodmo_name "diss_noble_gas_conc";
    String description "Helium (He) concentration";
    String long_name "He";
    String nerc_identifier "https://vocab.nerc.ac.uk/collection/P02/current/HEXC/";
    String units "micromoles per kilogram (umol/Kg)";
  }
  He_stdev {
    Float32 _FillValue NaN;
    Float32 actual_range 3.4e-6, 3.7e-6;
    String bcodmo_name "diss_noble_gas_conc";
    String description "Standard deviation of He concentration";
    String long_name "He Stdev";
    String nerc_identifier "https://vocab.nerc.ac.uk/collection/P02/current/HEXC/";
    String units "umol/Kg";
  }
  He_sat {
    Float32 _FillValue NaN;
    Float32 actual_range 0.00169, 0.00174;
    String bcodmo_name "diss_noble_gas_conc";
    String description "Saturated He concentration";
    String long_name "He Sat";
    String nerc_identifier "https://vocab.nerc.ac.uk/collection/P02/current/HEXC/";
    String units "umol/Kg";
  }
  He_sat_stdev {
    Float32 _FillValue NaN;
    Float32 actual_range 5.2e-6, 5.8e-6;
    String bcodmo_name "diss_noble_gas_conc";
    String description "Standard deviation of saturated He concentration";
    String long_name "He Sat Stdev";
    String nerc_identifier "https://vocab.nerc.ac.uk/collection/P02/current/HEXC/";
    String units "umol/Kg";
  }
  dHe {
    Float32 _FillValue NaN;
    Float32 actual_range -1.5, 6.6;
    String bcodmo_name "diss_noble_gas_conc";
    String description "dHe concentration";
    String long_name "D He";
    String nerc_identifier "https://vocab.nerc.ac.uk/collection/P02/current/HEXC/";
    String units "percent";
  }
  dHe_stdev {
    Float32 _FillValue NaN;
    Float32 actual_range 0.4, 0.4;
    String bcodmo_name "diss_noble_gas_conc";
    String description "Standard deviation of dHe concentration";
    String long_name "D He Stdev";
    String nerc_identifier "https://vocab.nerc.ac.uk/collection/P02/current/HEXC/";
    String units "percent";
  }
  He_flag {
    Byte _FillValue 127;
    Byte actual_range 1, 1;
    String bcodmo_name "diss_noble_gas_conc";
    Float64 colorBarMaximum 150.0;
    Float64 colorBarMinimum 0.0;
    String description "He concentration flag";
    String long_name "He Flag";
    String nerc_identifier "https://vocab.nerc.ac.uk/collection/P02/current/HEXC/";
    String units "unitless";
  }
  Ne {
    Float32 _FillValue NaN;
    Float32 actual_range 0.00659, 0.00715;
    String bcodmo_name "diss_noble_gas_conc";
    String description "Neon (Ne) concentration";
    String long_name "Ne";
    String nerc_identifier "https://vocab.nerc.ac.uk/collection/P02/current/HEXC/";
    String units "umol/Kg";
  }
  Ne_stdev {
    Float32 _FillValue NaN;
    Float32 actual_range 1.3e-5, 1.4e-5;
    String bcodmo_name "diss_noble_gas_conc";
    String description "Standard deviation of Ne concentration";
    String long_name "Ne Stdev";
    String nerc_identifier "https://vocab.nerc.ac.uk/collection/P02/current/HEXC/";
    String units "umol/Kg";
  }
  Ne_sat {
    Float32 _FillValue NaN;
    Float32 actual_range 0.00659, 0.00709;
    String bcodmo_name "diss_noble_gas_conc";
    String description "Saturated Ne concentration";
    String long_name "Ne Sat";
    String nerc_identifier "https://vocab.nerc.ac.uk/collection/P02/current/HEXC/";
    String units "umol/Kg";
  }
  Ne_sat_stdev {
    Float32 _FillValue NaN;
    Float32 actual_range 4.0e-5, 5.0e-5;
    String bcodmo_name "diss_noble_gas_conc";
    String description "Standard deviation of saturated Ne concentration";
    String long_name "Ne Sat Stdev";
    String nerc_identifier "https://vocab.nerc.ac.uk/collection/P02/current/HEXC/";
    String units "umol/Kg";
  }
  dNe {
    Float32 _FillValue NaN;
    Float32 actual_range -3.3, 2.1;
    String bcodmo_name "diss_noble_gas_conc";
    String description "dNe concentration";
    String long_name "D Ne";
    String nerc_identifier "https://vocab.nerc.ac.uk/collection/P02/current/HEXC/";
    String units "percent";
  }
  dNe_stdev {
    Float32 _FillValue NaN;
    Float32 actual_range 0.6, 0.8;
    String bcodmo_name "diss_noble_gas_conc";
    String description "Standard deviation of dNe concetration";
    String long_name "D Ne Stdev";
    String nerc_identifier "https://vocab.nerc.ac.uk/collection/P02/current/HEXC/";
    String units "percent";
  }
  Ne_flag {
    Byte _FillValue 127;
    Byte actual_range 1, 1;
    String bcodmo_name "diss_noble_gas_conc";
    Float64 colorBarMaximum 150.0;
    Float64 colorBarMinimum 0.0;
    String description "Ne concentration flag";
    String long_name "Ne Flag";
    String nerc_identifier "https://vocab.nerc.ac.uk/collection/P02/current/HEXC/";
    String units "unitless";
  }
  Ar {
    Float32 _FillValue NaN;
    Float32 actual_range 9.52, 11.0;
    String bcodmo_name "diss_noble_gas_conc";
    String description "Argon (Ar) concentration";
    String long_name "Ar";
    String nerc_identifier "https://vocab.nerc.ac.uk/collection/P02/current/HEXC/";
    String units "umol/Kg";
  }
  Ar_stdev {
    Float32 _FillValue NaN;
    Float32 actual_range 0.019, 0.022;
    String bcodmo_name "diss_noble_gas_conc";
    String description "Standard deviation of Ar concentration";
    String long_name "Ar Stdev";
    String nerc_identifier "https://vocab.nerc.ac.uk/collection/P02/current/HEXC/";
    String units "umol/Kg";
  }
  Ar_sat {
    Float32 _FillValue NaN;
    Float32 actual_range 9.45, 11.4;
    String bcodmo_name "diss_noble_gas_conc";
    String description "Saturated Ar concentration";
    String long_name "Ar Sat";
    String nerc_identifier "https://vocab.nerc.ac.uk/collection/P02/current/HEXC/";
    String units "umol/Kg";
  }
  Ar_sat_stdev {
    Float32 _FillValue NaN;
    Float32 actual_range 0.15, 0.21;
    String bcodmo_name "diss_noble_gas_conc";
    String description "Standard deviation of saturated Ar concentration";
    String long_name "Ar Sat Stdev";
    String nerc_identifier "https://vocab.nerc.ac.uk/collection/P02/current/HEXC/";
    String units "umol/Kg";
  }
  dAr {
    Float32 _FillValue NaN;
    Float32 actual_range -6.8, 1.4;
    String bcodmo_name "diss_noble_gas_conc";
    String description "dAr concentration";
    String long_name "D Ar";
    String nerc_identifier "https://vocab.nerc.ac.uk/collection/P02/current/HEXC/";
    String units "percent";
  }
  dAr_stdev {
    Float32 _FillValue NaN;
    Float32 actual_range 1.6, 1.8;
    String bcodmo_name "diss_noble_gas_conc";
    String description "Standard deviation of dAr concentration";
    String long_name "D Ar Stdev";
    String nerc_identifier "https://vocab.nerc.ac.uk/collection/P02/current/HEXC/";
    String units "percent";
  }
  Ar_flag {
    Byte _FillValue 127;
    Byte actual_range 1, 1;
    String bcodmo_name "diss_noble_gas_conc";
    Float64 colorBarMaximum 150.0;
    Float64 colorBarMinimum 0.0;
    String description "Ar concentration flag";
    String long_name "Ar Flag";
    String nerc_identifier "https://vocab.nerc.ac.uk/collection/P02/current/HEXC/";
    String units "unitless";
  }
  Kr {
    Float32 _FillValue NaN;
    Float32 actual_range 0.00209, 0.00245;
    String bcodmo_name "diss_noble_gas_conc";
    String description "Krypton (Kr) concentration";
    String long_name "KR";
    String nerc_identifier "https://vocab.nerc.ac.uk/collection/P02/current/HEXC/";
    String units "umol/Kg";
  }
  Kr_stdev {
    Float32 _FillValue NaN;
    Float32 actual_range 4.2e-6, 4.9e-6;
    String bcodmo_name "diss_noble_gas_conc";
    String description "Standard deviation of Kr concentration";
    String long_name "Kr Stdev";
    String nerc_identifier "https://vocab.nerc.ac.uk/collection/P02/current/HEXC/";
    String units "umol/Kg";
  }
  Kr_sat {
    Float32 _FillValue NaN;
    Float32 actual_range 0.002, 0.00254;
    String bcodmo_name "diss_noble_gas_conc";
    String description "Saturated Kr concentration";
    String long_name "Kr Sat";
    String nerc_identifier "https://vocab.nerc.ac.uk/collection/P02/current/HEXC/";
    String units "umol/Kg";
  }
  Kr_sat_stdev {
    Float32 _FillValue NaN;
    Float32 actual_range 4.1e-5, 5.8e-5;
    String bcodmo_name "diss_noble_gas_conc";
    String description "Standard deviation of saturated Kr concentration";
    String long_name "Kr Sat Stdev";
    String nerc_identifier "https://vocab.nerc.ac.uk/collection/P02/current/HEXC/";
    String units "umol/Kg";
  }
  dKr {
    Float32 _FillValue NaN;
    Float32 actual_range -6.2, 5.3;
    String bcodmo_name "diss_noble_gas_conc";
    String description "dKr concentration";
    String long_name "D KR";
    String nerc_identifier "https://vocab.nerc.ac.uk/collection/P02/current/HEXC/";
    String units "percent";
  }
  dKr_stdev {
    Float32 _FillValue NaN;
    Float32 actual_range 2.0, 2.4;
    String bcodmo_name "diss_noble_gas_conc";
    String description "Standard deviation of dKr concentration";
    String long_name "D Kr Stdev";
    String nerc_identifier "https://vocab.nerc.ac.uk/collection/P02/current/HEXC/";
    String units "percent";
  }
  Kr_flag {
    Float64 _FillValue NaN;
    String bcodmo_name "diss_noble_gas_conc";
    Float64 colorBarMaximum 150.0;
    Float64 colorBarMinimum 0.0;
    String description "Kr concentration flag";
    String long_name "Kr Flag";
    String nerc_identifier "https://vocab.nerc.ac.uk/collection/P02/current/HEXC/";
    String units "unitless";
  }
  Xe {
    Float32 _FillValue NaN;
    Float32 actual_range 2.74e-4, 3.25e-4;
    String bcodmo_name "diss_noble_gas_conc";
    String description "Xenon (Xe) concentration";
    String long_name "Xe";
    String nerc_identifier "https://vocab.nerc.ac.uk/collection/P02/current/HEXC/";
    String units "umol/Kg";
  }
  Xe_stdev {
    Float32 _FillValue NaN;
    Float32 actual_range 5.5e-7, 6.5e-7;
    String bcodmo_name "diss_noble_gas_conc";
    String description "Standard deviation of Xe concentration";
    String long_name "Xe Stdev";
    String nerc_identifier "https://vocab.nerc.ac.uk/collection/P02/current/HEXC/";
    String units "umol/Kg";
  }
  Xe_sat {
    Float32 _FillValue NaN;
    Float32 actual_range 2.56e-4, 3.44e-4;
    String bcodmo_name "diss_noble_gas_conc";
    String description "Saturated Xe concentration";
    String long_name "Xe Sat";
    String nerc_identifier "https://vocab.nerc.ac.uk/collection/P02/current/HEXC/";
    String units "umol/Kg";
  }
  Xe_sat_stdev {
    Float32 _FillValue NaN;
    Float32 actual_range 6.5e-6, 9.8e-6;
    String bcodmo_name "diss_noble_gas_conc";
    String description "Standard deviation of saturated Xe concentration";
    String long_name "Xe Sat Stdev";
    String nerc_identifier "https://vocab.nerc.ac.uk/collection/P02/current/HEXC/";
    String units "umol/Kg";
  }
  dXe {
    Float32 _FillValue NaN;
    Float32 actual_range -7.8, 13.2;
    String bcodmo_name "diss_noble_gas_conc";
    String description "dXe concentration";
    String long_name "D Xe";
    String nerc_identifier "https://vocab.nerc.ac.uk/collection/P02/current/HEXC/";
    String units "percent";
  }
  dXe_stdev {
    Float32 _FillValue NaN;
    Float32 actual_range 2.5, 3.0;
    String bcodmo_name "diss_noble_gas_conc";
    String description "Standard deviation of dXe concentration";
    String long_name "D Xe Stdev";
    String nerc_identifier "https://vocab.nerc.ac.uk/collection/P02/current/HEXC/";
    String units "percent";
  }
  Xe_flag {
    Float64 _FillValue NaN;
    String bcodmo_name "diss_noble_gas_conc";
    Float64 colorBarMaximum 150.0;
    Float64 colorBarMinimum 0.0;
    String description "Xe concentration flag";
    String long_name "Xe Flag";
    String nerc_identifier "https://vocab.nerc.ac.uk/collection/P02/current/HEXC/";
    String units "unitless";
  }
  notes {
    String bcodmo_name "diss_noble_gas_conc";
    String description "Notes";
    String long_name "Notes";
    String nerc_identifier "https://vocab.nerc.ac.uk/collection/P02/current/HEXC/";
    String units "unitless";
  }
 }
  NC_GLOBAL {
    String access_formats ".htmlTable,.csv,.json,.mat,.nc,.tsv,.esriCsv,.geoJson,.odvTxt";
    String acquisition_description 
"Noble gas concentrations were sampled using copper tube sampling (~13g
samples) with a handheld pump, and extracted and analyzed at the WHOI Isotope
Geochemistry Facility using peak height manometry and isotope dilution mass
spectrometry techniques. Uncertainties are calculated from replicate precision
and are similar to expected analytical uncertainties reported by WHOI IGF.
Noble gas saturation concentrations are calculated using the unpublished
solubility functions of Dempsey Lott III and William Jenkins (WHOI Isotope
Geochemistry Facility
([https://www.whoi.edu/IGF](\\\\\"https://www.whoi.edu/IGF\\\\\"))), derived for all
five gases from the same instrument over conditions near one atmosphere and
atmospheric partial pressures of the noble gases. Saturation concentrations
were calculated using a Monte Carlo approach in which temperature and salinity
(the dominant sources of uncertainty in the saturation concentration) were
allowed to randomly vary within the standard deviation bounds for the
environmental variability (1 degree Celsius, 0.5 on PSS-78) with 3000
iterations, and the mean variance of all iterations converted to a one
standard deviation uncertainty for the saturation concentration based on the
measured temperature and salinity at the sonde location. The same approach was
used to combine measurement uncertainties with saturation concentration
uncertainties and determine the one standard deviation uncertainty of the gas
saturation states. These uncertainties were simultaneously determined for all
gases at each timepoint, so that the full suite of noble gases vary with
respect to each other. Variations of temperature and salinity around the pond
were not random with respect to time (i.e. a location with high temperature
relative to the sonde at 10am generally had higher temperature at noon and 2pm
as well). Therefore the saturation state of any given noble gas varies
systematically across each time series; the difference between concentrations
at consecutive timepoints is conserved because the random uncertainty
associated with the individual measurements is an order of magnitude lower
than the systematic uncertainty associated with shifts in temperature and
salinity compared to that expected from the sonde.
 
Because of the sampling method (smaller than usual copper tube samples,
relatively slow and uneven flow from hand pumping compared to Niskin
sampling), it is possible that atmospheric He was not adequately flushed from
the copper tube and contaminated the samples for that gas only\\u2014we urge
caution in the interpretation of the He results, and do not use these
measurements in the associated manuscript (Howard et al., submitted to Limnol.
Oceanog. Letters). There was no evidence that this issue would affect the
other gases in a detectable manner, because of their higher solubility. One
noble gas sample was flagged as having a pattern of saturation states
consistent with contamination by a bubble during sampling. He, Ne, and Ar
concentrations and saturation states from this sample are likely too large,
but Kr and Xe are insensitive to bubble processes and any effect of sample
contamination in minor on these more soluble gases.";
    String awards_0_award_nid "529582";
    String awards_0_award_number "OCE-1233678";
    String awards_0_data_url "http://www.nsf.gov/awardsearch/showAward.do?AwardNumber=1233678";
    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 
"Noble Gases 
  R. Stanley and A. Spivak, PIs 
  Version 19 December 2016";
    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 "2016-12-20T18:48:59Z";
    String date_modified "2019-04-05T16:16:54Z";
    String defaultDataQuery "&amp;time&lt;now";
    String doi "10.1575/1912/bco-dmo.670694.1";
    Float64 Easternmost_Easting -70.831269;
    Float64 geospatial_lat_max 42.741097;
    Float64 geospatial_lat_min 42.741097;
    String geospatial_lat_units "degrees_north";
    Float64 geospatial_lon_max -70.831269;
    Float64 geospatial_lon_min -70.831269;
    String geospatial_lon_units "degrees_east";
    String history 
"2022-08-12T08:53:33Z (local files)
2022-08-12T08:53:33Z https://erddap.bco-dmo.org/tabledap/bcodmo_dataset_670694.das";
    String infoUrl "https://www.bco-dmo.org/dataset/670694";
    String institution "BCO-DMO";
    String instruments_0_acronym "IR Mass Spec";
    String instruments_0_dataset_instrument_description "Extracted and analyzed noble gas concentrations";
    String instruments_0_dataset_instrument_nid "670737";
    String instruments_0_description "The Isotope-ratio Mass Spectrometer is a particular type of mass spectrometer used to measure the relative abundance of isotopes in a given sample (e.g. VG Prism II Isotope Ratio Mass-Spectrometer).";
    String instruments_0_instrument_external_identifier "https://vocab.nerc.ac.uk/collection/L05/current/LAB16/";
    String instruments_0_instrument_name "Isotope-ratio Mass Spectrometer";
    String instruments_0_instrument_nid "469";
    String instruments_0_supplied_name "Isotope mass spectrometer";
    String instruments_1_dataset_instrument_description "Used with copper tube for noble gas sampling";
    String instruments_1_dataset_instrument_nid "670728";
    String instruments_1_description "A pump is a device that moves fluids (liquids or gases), or sometimes slurries, by mechanical action. Pumps can be classified into three major groups according to the method they use to move the fluid: direct lift, displacement, and gravity pumps";
    String instruments_1_instrument_name "Pump";
    String instruments_1_instrument_nid "726";
    String instruments_1_supplied_name "Handheld pump";
    String keywords "Ar_flag, Ar_sat, Ar_sat_stdev, Ar_stdev, bco, bco-dmo, biological, chemical, dAr, dAr_stdev, data, dataset, date, deviation, dHe, dHe_stdev, dKr, dKr_stdev, dmo, dNe, dNe_stdev, dXe, dXe_stdev, erddap, flag, He_flag, He_sat, He_sat_stdev, He_stdev, iso, Kr_flag, Kr_sat, Kr_sat_stdev, Kr_stdev, latitude, longitude, management, Ne_flag, Ne_sat, Ne_sat_stdev, Ne_stdev, notes, oceanography, office, preliminary, sat, standard, standard deviation, stdev, time, time2, Xe_flag, Xe_sat, Xe_sat_stdev, Xe_stdev";
    String license "https://www.bco-dmo.org/dataset/670694/license";
    String metadata_source "https://www.bco-dmo.org/api/dataset/670694";
    Float64 Northernmost_Northing 42.741097;
    String param_mapping "{'670694': {'lat': 'master - latitude', 'lon': 'master - longitude', 'ISO_DateTime_UTC': 'flag - time'}}";
    String parameter_source "https://www.bco-dmo.org/mapserver/dataset/670694/parameters";
    String people_0_affiliation "Wellesley College";
    String people_0_person_name "Rachel Stanley";
    String people_0_person_nid "529581";
    String people_0_role "Principal Investigator";
    String people_0_role_type "originator";
    String people_1_affiliation "Woods Hole Oceanographic Institution";
    String people_1_affiliation_acronym "WHOI";
    String people_1_person_name "Amanda Spivak";
    String people_1_person_nid "529580";
    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";
    String people_2_person_name "Evan Howard";
    String people_2_person_nid "669362";
    String people_2_role "Contact";
    String people_2_role_type "related";
    String people_3_affiliation "Woods Hole Oceanographic Institution";
    String people_3_affiliation_acronym "WHOI BCO-DMO";
    String people_3_person_name "Hannah Ake";
    String people_3_person_nid "650173";
    String people_3_role "BCO-DMO Data Manager";
    String people_3_role_type "related";
    String project "benthic_PP_at_TIDE";
    String projects_0_acronym "benthic_PP_at_TIDE";
    String projects_0_description 
"Extracted from the NSF award abstract:
This project will address how rates of benthic microalgal production respond to eutrophication and geomorphological changes in human-impacted tidal creeks. Excess nutrient loading increases benthic algal biomass and likely stimulates production rates but the magnitude of nutrient and geomorphological effects on rates of production is unknown. Will changes in benthic algal productivity affect algal-bacterial coupling? Furthermore, how is algal-bacterial coupling affected by geomorphological changes, which may be exacerbated by excess nutrient loading but can also occur in pristine marshes?
This project will take advantage of the infrastructure of the TIDE project, a long-term saltmarsh eutrophication experiment at the Plum Island Ecosystem - Long Term Ecological Research site in Northeastern Massachusetts. Specifically, the PIs will measure benthic metabolism and examine algal- bacterial coupling in fertilized and ambient nutrient tidal creeks in the first field season. The following field season, they will compare sediment metabolism and carbon dynamics on slumped tidal creek walls (i.e. areas where low marsh has collapsed into the tidal creek) to that on the bottom of tidal creeks. In both years, gross and net production will be determined using an innovative triple oxygen isotope technique and traditional dissolved oxygen and inorganic carbon flux measurements. Comparisons between these methods will be useful in informing studies of sediment metabolism. Lipid biomarkers will be used to characterize the sources of organic matter to creek sediments, and stable isotope analysis of bacterial specific biomarkers to identify the sources of organic carbon utilized by sediment bacteria. The biomarkers will reveal whether sediment bacteria use organic matter substrates, such as benthic microalgal carbon, selectively or in proportion to availability. Overall, results from the proposed study will provide important information about how sediment carbon dynamics in shallow tidal creeks respond to long term eutrophication. Furthermore, findings will enhance understanding of the role of tidal creeks in coastal biogeochemistry.";
    String projects_0_end_date "2015-08";
    String projects_0_geolocation "Plum Island Estuary, Rowley Massachusetts";
    String projects_0_name "Eutrophication Effects on Sediment Metabolism and Benthic Algal-bacterial Coupling: An Application of Novel Techniques in a LTER Estuary";
    String projects_0_project_nid "529583";
    String projects_0_start_date "2012-09";
    String publisher_name "Biological and Chemical Oceanographic Data Management Office (BCO-DMO)";
    String publisher_type "institution";
    String sourceUrl "(local files)";
    Float64 Southernmost_Northing 42.741097;
    String standard_name_vocabulary "CF Standard Name Table v55";
    String subsetVariables "latitude,longitude,dHe_stdev,He_flag,Kr_flag,Xe_flag";
    String summary "Noble gas concentrations and saturations from Marsh Pond in Massachusetts, USA from 2014.";
    String time_coverage_end "2014-08-26T15:35:00Z";
    String time_coverage_start "2014-07-29T05:59:00Z";
    String title "Noble gas concentrations and saturations from Marsh Pond in Massachusetts, USA from 2014.";
    String version "1";
    Float64 Westernmost_Easting -70.831269;
    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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