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| Dataset Title: | [Pump Profiler Casts - HRS1415] - Data from in situ pump profiler system collected on R/V Hugh R. Sharp cruise HRS1415 in August 2014 (The role of soluble Mn(III) in the biogeochemical coupling of the Mn, Fe and sulfur cycles) 
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| Institution: | BCO-DMO (Dataset ID: bcodmo_dataset_718887) |
| Information: | Summary
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| ISO 19115
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Attributes {
s {
Cast {
Byte _FillValue 127;
String _Unsigned "false";
Byte actual_range 2, 11;
String bcodmo_name "cast";
String description "Cast identifier";
String long_name "Cast";
String units "unitless";
}
latitude {
String _CoordinateAxisType "Lat";
Float64 _FillValue NaN;
Float64 actual_range 38.9758, 38.9768;
String axis "Y";
String bcodmo_name "latitude";
Float64 colorBarMaximum 90.0;
Float64 colorBarMinimum -90.0;
String description "Latitude; positive values = North";
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 -76.368, -76.3663;
String axis "X";
String bcodmo_name "longitude";
Float64 colorBarMaximum 180.0;
Float64 colorBarMinimum -180.0;
String description "Longitude; positive values = East";
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";
}
date {
String bcodmo_name "date";
String description "Date of sampling formatted as m/dd/yyyy";
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";
}
time_local {
String bcodmo_name "time";
String description "Time of sampling (local time zone) formatted as HH:MM";
String long_name "Time Local";
String nerc_identifier "https://vocab.nerc.ac.uk/collection/P01/current/AHMSAA01/";
String units "unitless";
}
time_GMT {
String bcodmo_name "time";
String description "Time of sampling (GMT) formatted as HH:MM";
String long_name "Time GMT";
String nerc_identifier "https://vocab.nerc.ac.uk/collection/P01/current/AHMSAA01/";
String units "unitless";
}
time {
String _CoordinateAxisType "Time";
Float64 actual_range 1.40843532e+9, 1.4087277e+9;
String axis "T";
String bcodmo_name "ISO_DateTime_UTC";
String description "Date and time of sampling formatted to ISO8601 standard (yyyy-mm-ddTHH:MM); constructed using original date and time_GMT fields.";
String ioos_category "Time";
String long_name "ISO Date Time UTC";
String nerc_identifier "https://vocab.nerc.ac.uk/collection/P01/current/DTUT8601/";
String source_name "ISO_DateTime_UTC";
String standard_name "time";
String time_origin "01-JAN-1970 00:00:00";
String time_precision "1970-01-01T00:00:00.00Z";
String units "seconds since 1970-01-01T00:00:00Z";
}
depth {
String _CoordinateAxisType "Height";
String _CoordinateZisPositive "down";
Float64 _FillValue NaN;
Float64 actual_range 0.4, 21.1;
String axis "Z";
String bcodmo_name "depth";
Float64 colorBarMaximum 8000.0;
Float64 colorBarMinimum -8000.0;
String colorBarPalette "TopographyDepth";
String description "Sample depth";
String ioos_category "Location";
String long_name "Depth";
String nerc_identifier "https://vocab.nerc.ac.uk/collection/P09/current/DEPH/";
String positive "down";
String standard_name "depth";
String units "m";
}
temp {
Float32 _FillValue NaN;
Float32 actual_range 23.2, 29.3;
String bcodmo_name "temperature";
String description "Water temperature";
String long_name "Temperature";
String nerc_identifier "https://vocab.nerc.ac.uk/collection/P01/current/TEMPP901/";
String units "degrees Celsius";
}
salinity {
Float32 _FillValue NaN;
Float32 actual_range 8.7, 18.6;
String bcodmo_name "sal";
Float64 colorBarMaximum 37.0;
Float64 colorBarMinimum 32.0;
String description "Salinity";
String long_name "Sea Water Practical Salinity";
String nerc_identifier "https://vocab.nerc.ac.uk/collection/P01/current/PSALST01/";
String units "unitless";
}
O2 {
String bcodmo_name "dissolved Oxygen";
String description "Oxygen";
String long_name "O2";
String units "micromolar (uM)";
}
O2_stdev {
String bcodmo_name "dissolved Oxygen";
String description "Standard deviation of oxygen";
String long_name "O2 Stdev";
String units "micromolar (uM)";
}
H2Splus_HSminus {
String bcodmo_name "sulfide";
String description "H2S+ HS-";
String long_name "H2 Splus HSminus";
String units "micromolar (uM)";
}
H2Splus_HSminus_stdev {
String bcodmo_name "sulfide";
String description "Standard deviation of H2S+ HS-";
String long_name "H2 Splus HSminus Stdev";
String units "micromolar (uM)";
}
Particulate_MnOx_eqvln {
String bcodmo_name "Mn";
String description "Particulate Manganese oxide (MnOx)";
String long_name "Particulate Mn Ox Eqvln";
String units "nanomolar (nM)";
}
Particulate_MnOx_eqvln_stdev {
String bcodmo_name "Mn";
String description "Standard deviation of Particulate Manganese oxide";
String long_name "Particulate Mn Ox Eqvln Stdev";
String units "nanomolar (nM)";
}
Dissolved_MnT {
Float32 _FillValue NaN;
Float32 actual_range 48.44, 3643.9;
String bcodmo_name "Mn";
String description "Dissolved MnT";
String long_name "Dissolved Mn T";
String units "nanomolar (nM)";
}
Dissolved_MnT_stdev {
Float32 _FillValue NaN;
Float32 actual_range 0.55, 204.43;
String bcodmo_name "Mn";
String description "Standard deviation of dissolved MnT";
String long_name "Dissolved Mn T Stdev";
String units "nanomolar (nM)";
}
Dissolved_Mn2plus {
Float32 _FillValue NaN;
Float32 actual_range 19.6, 3221.81;
String bcodmo_name "Mn";
String description "Dissolved Mn2+";
String long_name "Dissolved Mn2plus";
String units "nanomolar (nM)";
}
Dissolved_Mn2plus_stdev {
Float32 _FillValue NaN;
Float32 actual_range 0.0, 128.4;
String bcodmo_name "Mn";
String description "Standard deviation of dissolved Mn2+";
String long_name "Dissolved Mn2plus Stdev";
String units "nanomolar (nM)";
}
Dissolved_Mn3plus {
Float32 _FillValue NaN;
Float32 actual_range 0.0, 1204.32;
String bcodmo_name "Mn";
String description "Dissolved Mn3+ where Mn3+ = [MnT - Mn2+]";
String long_name "Dissolved Mn3plus";
String units "nanomolar (nM)";
}
pcnt_Mn3 {
Float32 _FillValue NaN;
Float32 actual_range 0.0, 84.74;
String bcodmo_name "Mn";
String description "%Mn(III)";
String long_name "PCNT MN3";
String units "uM or %?";
}
Filtered_Fe2plus {
String bcodmo_name "Fe";
String description "Filtered Fe2+";
String long_name "Filtered Fe2plus";
String units "micromolar (uM)";
}
Filtered_Fe2plus_stdev {
Float32 _FillValue NaN;
Float32 actual_range 0.0044, 0.054;
String bcodmo_name "Fe";
String description "Standard deviation of filtered Fe2+";
String long_name "Filtered Fe2plus Stdev";
String units "micromolar (uM)";
}
Unfiltered_Fe2plus {
Float32 _FillValue NaN;
Float32 actual_range 0.476, 3.52;
String bcodmo_name "Fe";
String description "Unfiltered Fe2+";
String long_name "Unfiltered Fe2plus";
String units "micromolar (uM)";
}
Unfiltered_Fe2plus_stdev {
Float32 _FillValue NaN;
Float32 actual_range 0.002, 0.47;
String bcodmo_name "Fe";
String description "Standard deviation of unfiltered Fe2+";
String long_name "Unfiltered Fe2plus Stdev";
String units "micromolar (uM)";
}
Filtered_Fe3plus {
String bcodmo_name "Fe";
String description "Filtered Fe3+";
String long_name "Filtered Fe3plus";
String units "micromolar (uM)";
}
Filtered_Fe3plus_stdev {
Float32 _FillValue NaN;
Float32 actual_range 0.01, 0.02;
String bcodmo_name "Fe";
String description "Standard deviation of filtered Fe3+";
String long_name "Filtered Fe3plus Stdev";
String units "micromolar (uM)";
}
Unfiltered_Fe3plus {
String bcodmo_name "Fe";
String description "Unfiltered Fe3+";
String long_name "Unfiltered Fe3plus";
String units "micromolar (uM)";
}
Unfiltered_Fe3plus_stdev {
Float32 _FillValue NaN;
Float32 actual_range 0.002, 0.1;
String bcodmo_name "Fe";
String description "Standard deviation of unfiltered Fe3+";
String long_name "Unfiltered Fe3plus Stdev";
String units "micromolar (uM)";
}
nanoparticulate_S0 {
String bcodmo_name "sulfide";
String description "Nanoparticulate S(0)";
String long_name "Nanoparticulate S0";
String units "nanomolar (nM)";
}
particulate_S0 {
String bcodmo_name "sulfide";
String description "Particulate S(0)";
String long_name "Particulate S0";
String units "nanomolar (nM)";
}
}
NC_GLOBAL {
String access_formats ".htmlTable,.csv,.json,.mat,.nc,.tsv,.esriCsv,.geoJson,.odvTxt";
String acquisition_description
"Description/methods for parameters measured:
C parameters performed by Dr. Wei-Jun Cai\\u2019s group for:
TA - Open cell Gran titration with semi-automatic\\u00a0AS-ALK2 Apollo
Scitech titrator;
pH - glass electrode, NBS buffers;
DIC - infrared CO2 analyzer (AS-C3, Apollo Scitech).
Use Dickson CRM for calibration. DIC/TA samples were filtered (0.45um) and
fixed with 100 ul of saturated mercury bichloride.
Use the methods of Gran (1952) and Huang, et al. (2012).
Fe parameters:
The method of Stookey (1972) is used to determine dissolved Fe(II) and on
addition if hydroxylamine Fe total. Fe(III) is determined by difference.
Modified and calibrated by many including Lewis et al (2007) and MacDonald et
al (2014). Typically, triplicate measurements performed.
Dissolved Mn parameters:
The porphyrin spectrophotometric method of Madison et al (2011) measures
dissolved Mn(II), Mn(III) bound to weaker ligands and total Mn. Method
includes calibration and intercomparison of totals with other instrumentation
(ICP, AA).\\u00a0 Detection limit is 0.050 micromolar. Detection limit (DL) is
50 micromolar with a 1 cm path length cell.
Modification of Madison for Mn(III) bound to strong ligands by adding a
reducing agent to a separate subsample with the porphyrin to obtain total Mn.
Mn(III) bound to strong ligand complexes is determined by difference.
Typically, triplicate measurements performed. Detection limit is 3.0
nanomolar.
MnOx on unfiltered samples:
The leucoberbelein blue method is that of Altmann (1972) and Krumblein and
Altmann (1973) in 1 cm cells, but can be modified for longer path length
cells.
S parameters:
O2, H2S and polysulfides by the voltammetry method of Luther et al (2008).
A flow cell was also used to collect in situ O2 and H2S data as well as some
additional samples. Analysis by voltammetry (Luther et al, 2008).
Solid and nanoparticulate S8 (Y\\u00fccel et al 2010 and Findlay et al 2014).
Typically, triplicate measurements performed.\\u00a0
In situ\\u00a0pump profiler cast refers to profiling with a pump profiler for
O2\\u00a0and H2S using solid state gold-amalgam electrodes for voltammetry
(Luther et al, 2008; Analytical Instrument Systems DLK-60) along with a
temperature and salinity sensor from YSI. Water was pumped aboard to make
measurements on discrete samples for Mn and Fe speciation as well.\\u00a0
Methods papers used in this project (full citations in Related Publications
section)
Dissolved Mn speciation parameters:
Madison et al. (2011)
Madison et al. (2013)\\u00a0
Oldham et al. (2015)
Oldham et al. (2017)
[[\\u00a0Here, we modified the method of Madison et al. (2011) for water
column samples to achieve a detection limit of 3.0 nM (3 times the standard
deviation of a blank) by using a 100-cm liquid waveguide capillary cell and
the addition of a heating step as well as a strong reducing agent for Mn
Speciation [Mn3+ = MnT \\u2013 Mn2+]. See Table 1 in this paper for recovery
tests. As weak Mn(III)-L complexes could not be measured in our previous work
(Oldham et al, 2015; paper above), this method was used throughout this
cruise. ]]
MnOX solids:
Altmann (1972)
Krumbein & Altmann (1973)
Dissolved Fe speciation parameters:
Stookey (1970)
Lewis et al. (2007)
O2 and H2S, polysulfides:
Luther et al. (2008)
Luther et al. (2013)
S8:
Y\\u00fccel et al. (2010)
pH and inorganic carbon parameters:
Gran (1952)
Huang & Cai (2012)";
String awards_0_award_nid "636519";
String awards_0_award_number "OCE-1155385";
String awards_0_data_url "http://www.nsf.gov/awardsearch/showAward.do?AwardNumber=1155385";
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 "Donald L. Rice";
String awards_0_program_manager_nid "51467";
String cdm_data_type "Other";
String comment
"Pump Profiler Cast Data
Cruise HRS1415 (140818GL) - August 2014
PI: George W. Luther (University of Delaware)
Co-PI: Bradley M. Tebo (Oregon Health and Science University)
Version: 08 November 2017
NOTES:
suboxic_zone indicates that O2 and H2S are not detected
not_analyzed = not analyzed;
not_detected_or_BDL = not detected or below detection limit
BDL = below detection limit (BDL)
nd = no data/not measured";
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 "2017-11-08T19:42:29Z";
String date_modified "2020-01-10T21:34:12Z";
String defaultDataQuery "&time<now";
String doi "10.1575/1912/bco-dmo.718887.1";
Float64 Easternmost_Easting -76.3663;
Float64 geospatial_lat_max 38.9768;
Float64 geospatial_lat_min 38.9758;
String geospatial_lat_units "degrees_north";
Float64 geospatial_lon_max -76.3663;
Float64 geospatial_lon_min -76.368;
String geospatial_lon_units "degrees_east";
Float64 geospatial_vertical_max 21.1;
Float64 geospatial_vertical_min 0.4;
String geospatial_vertical_positive "down";
String geospatial_vertical_units "m";
String history
"2024-11-23T16:40:54Z (local files)
2024-11-23T16:40:54Z https://erddap.bco-dmo.org/erddap/tabledap/bcodmo_dataset_718887.html";
String infoUrl "https://www.bco-dmo.org/dataset/718887";
String institution "BCO-DMO";
String instruments_0_acronym "Water Temp Sensor";
String instruments_0_dataset_instrument_description "The YSI model 350 probe measures salinity and temperature.";
String instruments_0_dataset_instrument_nid "718901";
String instruments_0_description "General term for an instrument that measures the temperature of the water with which it is in contact (thermometer).";
String instruments_0_instrument_external_identifier "https://vocab.nerc.ac.uk/collection/L05/current/134/";
String instruments_0_instrument_name "Water Temperature Sensor";
String instruments_0_instrument_nid "647";
String instruments_0_supplied_name "YSI model 350";
String instruments_1_acronym "Automatic titrator";
String instruments_1_dataset_instrument_nid "718894";
String instruments_1_description "Instruments that incrementally add quantified aliquots of a reagent to a sample until the end-point of a chemical reaction is reached.";
String instruments_1_instrument_external_identifier "https://vocab.nerc.ac.uk/collection/L05/current/LAB12/";
String instruments_1_instrument_name "Automatic titrator";
String instruments_1_instrument_nid "682";
String instruments_1_supplied_name "AS-ALK2 Apollo Scitech titrator";
String instruments_2_acronym "Voltammetry Analyzers";
String instruments_2_dataset_instrument_nid "718896";
String instruments_2_description "Instruments that obtain information about an analyte by applying a potential and measuring the current produced in the analyte.";
String instruments_2_instrument_external_identifier "https://vocab.nerc.ac.uk/collection/L05/current/LAB35/";
String instruments_2_instrument_name "Voltammetry Analyzers";
String instruments_2_instrument_nid "698";
String instruments_3_acronym "Salinity Sensor";
String instruments_3_dataset_instrument_description "The YSI model 350 probe measures salinity and temperature.";
String instruments_3_dataset_instrument_nid "718900";
String instruments_3_description "Category of instrument that simultaneously measures electrical conductivity and temperature in the water column to provide temperature and salinity data.";
String instruments_3_instrument_external_identifier "https://vocab.nerc.ac.uk/collection/L05/current/350/";
String instruments_3_instrument_name "Salinity Sensor";
String instruments_3_instrument_nid "710";
String instruments_3_supplied_name "YSI 350";
String instruments_4_dataset_instrument_description "The pump is home made and consists of a West marine pump (12 V DC; flow rate of 160 L/hr) attached to 30 m of 1 inch ID and 1-3/8 inch OD high pressure clear PVC tubing. Valves and outlets are attached to the tubing outlet for sample collection and to go to the sensors onboard.";
String instruments_4_dataset_instrument_nid "718903";
String instruments_4_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_4_instrument_name "Pump";
String instruments_4_instrument_nid "726";
String instruments_5_acronym "CO2 Analyzer";
String instruments_5_dataset_instrument_nid "718895";
String instruments_5_description "Measures atmospheric carbon dioxide (CO2) concentration.";
String instruments_5_instrument_external_identifier "https://vocab.nerc.ac.uk/collection/L05/current/382/";
String instruments_5_instrument_name "CO2 Analyzer";
String instruments_5_instrument_nid "491476";
String instruments_5_supplied_name "AS-C3, Apollo Scitech infrared CO2 analyzer";
String keywords "bco, bco-dmo, biological, cast, chemical, data, dataset, date, density, depth, deviation, dissolved, Dissolved_Mn2plus, Dissolved_Mn2plus_stdev, Dissolved_Mn3plus, Dissolved_MnT, Dissolved_MnT_stdev, dmo, earth, Earth Science > Oceans > Salinity/Density > Salinity, eqvln, erddap, fe2plus, fe3plus, filtered, Filtered_Fe2plus, Filtered_Fe2plus_stdev, Filtered_Fe3plus, Filtered_Fe3plus_stdev, H2Splus_HSminus, H2Splus_HSminus_stdev, hsminus, iso, latitude, local, longitude, management, mn2plus, mn3, mn3plus, nanoparticulate, nanoparticulate_S0, O2, O2_stdev, ocean, oceanography, oceans, office, oxygen, particulate, Particulate_MnOx_eqvln, Particulate_MnOx_eqvln_stdev, particulate_S0, pcnt, pcnt_Mn3, practical, preliminary, salinity, science, sea, sea_water_practical_salinity, seawater, splus, standard, standard deviation, stdev, temperature, time, time_GMT, time_local, unfiltered, Unfiltered_Fe2plus, Unfiltered_Fe2plus_stdev, Unfiltered_Fe3plus, Unfiltered_Fe3plus_stdev, water";
String keywords_vocabulary "GCMD Science Keywords";
String license "https://www.bco-dmo.org/dataset/718887/license";
String metadata_source "https://www.bco-dmo.org/api/dataset/718887";
Float64 Northernmost_Northing 38.9768;
String param_mapping "{'718887': {'lat': 'flag - latitude', 'depth': 'flag - depth', 'lon': 'flag - longitude', 'ISO_DateTime_UTC': 'flag - time'}}";
String parameter_source "https://www.bco-dmo.org/mapserver/dataset/718887/parameters";
String people_0_affiliation "University of Delaware";
String people_0_person_name "George W. Luther";
String people_0_person_nid "50547";
String people_0_role "Principal Investigator";
String people_0_role_type "originator";
String people_1_affiliation "Oregon Health & Science University";
String people_1_affiliation_acronym "IEH/OHSU";
String people_1_person_name "Bradley M. Tebo";
String people_1_person_nid "527496";
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 "Shannon Rauch";
String people_2_person_nid "51498";
String people_2_role "BCO-DMO Data Manager";
String people_2_role_type "related";
String project "Soluble ManganeseIII";
String projects_0_acronym "Soluble ManganeseIII";
String projects_0_description
"Description from NSF award abstract:
The research conducted by investigators in the School of Marine Science and Policy at the University of Delaware and within the Department of Environmental and Biomolecular Systems of Oregon Health and Science University will examine the importance of soluble Mn(III) in the biogeochemical cycling of Mn. To date, most studies of Mn in marine environments have not considered Mn(III), the intermediate oxidation state between the soluble reduced state (Mn(II)) and the more insoluble oxidized state (Mn(IV)). The presence and stability of Mn(III) in marine systems, especially those where oxygen levels are reduced, changes the dynamics and stability, solubility and fate and transport of Mn in these locations, and at interfaces between oxic and low oxygen environments. This is not understood at present and the proposed research is poised to provide new information concerning the Mn cycle and is potentially transformative research. The PIs have developed new methods to examine Mn(III) levels in the environment and this capability will bolster the successful accomplishment of the project's goals. The studies will not only focus on understanding the cycling of Mn between its various oxidation states but will determine the concentration and distribution of Mn(III) in stratified coastal ocean waters and in sediment porewaters. The study will also examine the potentially important role of Mn(III) in mediating and influencing the biogeochemical cycling of Mn with that of Fe and S, which are both important components of the major ocean chemical cycles. A better understanding of the biogeochemistry of Mn will inform not only scientists interested in metal cycling in the ocean but also those focused on studies across redox transition zones. The proposed research has an international component and the investigators have developed plans to broadly disseminate their results to students at all levels and to the community. The Principal Investigators have a strong history in education and graduate student and post-doctoral support and mentoring and this will continue under the current grant.";
String projects_0_end_date "2016-01";
String projects_0_geolocation "Chesapeake Bay and coastal Atlantic Ocean";
String projects_0_name "The role of soluble Mn(III) in the biogeochemical coupling of the Mn, Fe and sulfur cycles";
String projects_0_project_nid "636520";
String projects_0_start_date "2012-02";
String publisher_name "Biological and Chemical Oceanographic Data Management Office (BCO-DMO)";
String publisher_type "institution";
String sourceUrl "(local files)";
Float64 Southernmost_Northing 38.9758;
String standard_name_vocabulary "CF Standard Name Table v55";
String summary "Data from in situ pump profiler system collected on R/V Hugh R. Sharp cruise HRS1415 in August 2014";
String time_coverage_end "2014-08-22T17:15:00.00Z";
String time_coverage_start "2014-08-19T08:02:00.00Z";
String title "[Pump Profiler Casts - HRS1415] - Data from in situ pump profiler system collected on R/V Hugh R. Sharp cruise HRS1415 in August 2014 (The role of soluble Mn(III) in the biogeochemical coupling of the Mn, Fe and sulfur cycles)";
String version "1";
Float64 Westernmost_Easting -76.368;
String xml_source "osprey2erddap.update_xml() v1.3";
}
}
Data Access Protocol (DAP) and its
selection constraints.
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.