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| Dataset Title: | Nitrate isotope data from R/V Thomas G. Thompson cruise TN303 in the Eastern Tropical Pacific in 2013 (U.S. GEOTRACES EPZT project) 
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| Institution: | BCO-DMO (Dataset ID: bcodmo_dataset_650087) |
| Information: | Summary
| License
| ISO 19115
| Metadata
| Background
| Subset
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Attributes {
s {
cruise_id {
String bcodmo_name "cruise_id";
String description "Cruise identification";
String long_name "Cruise Id";
String units "unitless";
}
STNNBR {
Byte _FillValue 127;
Byte actual_range 1, 36;
String bcodmo_name "station";
String description "Station number; values added from the EPZT master file.";
String long_name "STNNBR";
String units "unitless";
}
GEOTRC_EVENTNO {
Int16 _FillValue 32767;
Int16 actual_range 4012, 4474;
String bcodmo_name "event";
String description "GEOTRACES event number; values added from the EPZT master file.";
String long_name "GEOTRC EVENTNO";
String nerc_identifier "https://vocab.nerc.ac.uk/collection/P01/current/EVTAGFL/";
String units "unitless";
}
CASTNO {
Byte _FillValue 127;
Byte actual_range 1, 17;
String bcodmo_name "cast";
String description "Cast number; values added from the EPZT master file.";
String long_name "CASTNO";
String units "unitless";
}
ISO_DATETIME_UTC_START_EVENT {
String bcodmo_name "ISO_DateTime_UTC";
String description "Date and time, formatted to the ISO 8601 standard, at the start of the sampling event, according to the event log. In the format YYYY-MM-DDTHH:MM:SS[.xx]Z";
String long_name "ISO DATETIME UTC START EVENT";
String nerc_identifier "https://vocab.nerc.ac.uk/collection/P01/current/DTUT8601/";
String source_name "ISO_DATETIME_UTC_START_EVENT";
String time_precision "1970-01-01T00:00:00.00Z";
String units "unitless";
}
latitude {
String _CoordinateAxisType "Lat";
Float64 _FillValue NaN;
Float64 actual_range -16.00067, -10.25017;
String axis "Y";
String bcodmo_name "latitude";
String description "Latitude at the start of the event (according to the event log); north is positive; values added from the EPZT master file.";
String ioos_category "Location";
String long_name "EVENT LAT";
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 -152.0005, -77.37617;
String axis "X";
String bcodmo_name "longitude";
String description "Longitude at the start of the event (according to the event log); east is positive; values added from the EPZT master file.";
String ioos_category "Location";
String long_name "EVENT LON";
String nerc_identifier "https://vocab.nerc.ac.uk/collection/P09/current/LONX/";
String standard_name "longitude";
String units "degrees_east";
}
GEOTRC_INSTR {
String bcodmo_name "instrument";
String description "Sampling instrument; values added from the EPZT master file.";
String long_name "GEOTRC INSTR";
String units "unitless";
}
GEOTRC_SAMPNO {
Int16 _FillValue 32767;
Int16 actual_range 2071, 10454;
String bcodmo_name "sample";
String description "Unique GEOTRACES sample number";
String long_name "GEOTRC SAMPNO";
String nerc_identifier "https://vocab.nerc.ac.uk/collection/P02/current/ACYC/";
String units "unitless";
}
depth {
String _CoordinateAxisType "Height";
String _CoordinateZisPositive "down";
Float64 _FillValue NaN;
Float64 actual_range 2.9, 5500.3;
String axis "Z";
String bcodmo_name "depth";
Float64 colorBarMaximum 8000.0;
Float64 colorBarMinimum -8000.0;
String colorBarPalette "TopographyDepth";
String description "Sampling depth, provided by the PI.";
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";
}
NO3_15_D_DELTA_BOTTLE {
Float32 _FillValue NaN;
Float32 actual_range 4.7, 37.48;
String bcodmo_name "dN15_NO3";
Float64 colorBarMaximum 50.0;
Float64 colorBarMinimum 0.0;
String description "Average nitrate delta 15N, reported in units of permil vs. atmospheric N2.";
String long_name "Mole Concentration Of Nitrate In Sea Water";
String units "permil";
}
NO3_15_D_DELTA_BOTTLE_STDEV {
Float32 _FillValue NaN;
Float32 actual_range 0.0, 0.71;
String bcodmo_name "standard deviation";
Float64 colorBarMaximum 50.0;
Float64 colorBarMinimum 0.0;
String description "Standard deviation of nitrate delta 15N analysis, reported in units of permil vs. atmospheric N2.";
String long_name "Mole Concentration Of Nitrate In Sea Water";
String units "permil";
}
num_of_analyses {
Byte _FillValue 127;
Byte actual_range 2, 7;
String bcodmo_name "num_reps";
String description "The number of replicates analyzed for a given sample.";
String long_name "Num Of Analyses";
String units "dimensionless";
}
NO3_15_D_DELTA_BOTTLE_FLAG {
Byte _FillValue 127;
Byte actual_range 1, 3;
String bcodmo_name "flag";
Float64 colorBarMaximum 150.0;
Float64 colorBarMinimum 0.0;
String description "NO3_15_D_DELTA_BOTTLE quality flag. 1 indicates that the sample was treated with sulfamic acid ; 2 indicates that the nitrate concentration of the sample was too low for delta 15N analysis ; 3 indicates that no sample was collected.";
String long_name "NO3 15 D DELTA BOTTLE FLAG";
String units "dimensionless";
}
SAMPNO {
Byte _FillValue 127;
Byte actual_range 1, 23;
String bcodmo_name "bottle";
String description "Sequential sample number within the cast (usually corresponds to bottle number); values added from the EPZT master file.";
String long_name "SAMPNO";
String units "unitless";
}
BTLNBR {
String bcodmo_name "bottle";
String description "Bottle number; typically 1-24; values added from the EPZT master file.";
String long_name "BTLNBR";
String units "unitless";
}
BTLNBR_FLAG_W {
Byte _FillValue 127;
Byte actual_range 2, 4;
String bcodmo_name "flag";
Float64 colorBarMaximum 150.0;
Float64 colorBarMinimum 0.0;
String description "Bottle number quality flag; follows WOCE conventions. 2 = good; 3 = questionable; 4 = bad; 9 = missing data; values added from the EPZT master file.";
String long_name "BTLNBR FLAG W";
String units "unitless";
}
time {
String _CoordinateAxisType "Time";
Float64 actual_range 1.38301176e+9, 1.38734214e+9;
String axis "T";
String bcodmo_name "ISO_DateTime_UTC";
String description "Date and time, formatted to the ISO 8601 standard, at the time of bottle firing; values added from the EPZT master file.";
String ioos_category "Time";
String long_name "BTL ISO DATETIME UTC";
String nerc_identifier "https://vocab.nerc.ac.uk/collection/P01/current/DTUT8601/";
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";
}
BTL_LAT {
Float32 _FillValue NaN;
Float32 actual_range -16.0006, -10.25;
String bcodmo_name "latitude";
String description "Latitude of bottle firing; north is positive; values added from the EPZT master file.";
String long_name "BTL LAT";
String nerc_identifier "https://vocab.nerc.ac.uk/collection/P09/current/LATX/";
String units "decimal degrees";
}
BTL_LON {
Float32 _FillValue NaN;
Float32 actual_range -152.0006, -77.3761;
String bcodmo_name "longitude";
String description "Lonitude of bottle firing; east is positive; values added from the EPZT master file.";
String long_name "BTL LON";
String nerc_identifier "https://vocab.nerc.ac.uk/collection/P09/current/LONX/";
String units "decimal degrees";
}
ODF_CTDPRS {
Float32 _FillValue NaN;
Float32 actual_range 2.9, 5609.2;
String bcodmo_name "pressure";
String description "The ODF software acquisition measurement of pressure; values added from the EPZT master file.";
String long_name "ODF CTDPRS";
String nerc_identifier "https://vocab.nerc.ac.uk/collection/P01/current/PRESPR01/";
String units "decibars";
}
SMDEPTH {
Float32 _FillValue NaN;
Float32 actual_range 2.9, 5503.7;
String bcodmo_name "depth";
String description "Saunders-Mantyla depth (integrated; uses dynamic height); values added from the EPZT master file.";
String long_name "SMDEPTH";
String nerc_identifier "https://vocab.nerc.ac.uk/collection/P09/current/DEPH/";
String units "meters";
}
FMDEPTH {
Float32 _FillValue NaN;
Float32 actual_range 2.9, 5505.2;
String bcodmo_name "depth";
String description "Fofonoff-Millard depth (non-integrated; also used by SBE); values added from the EPZT master file.";
String long_name "FMDEPTH";
String nerc_identifier "https://vocab.nerc.ac.uk/collection/P09/current/DEPH/";
String units "meters";
}
BTMDEPTH {
Int16 _FillValue 32767;
Int16 actual_range 122, 5527;
String bcodmo_name "depth_bottom";
String description "Bottom depth; values added from the EPZT master file.";
String long_name "BTMDEPTH";
String units "meters";
}
CTDPRS {
Float32 _FillValue NaN;
Float32 actual_range 2.9, 5609.2;
String bcodmo_name "pressure";
String description "CTD pressure; values added from the EPZT master file.";
String long_name "CTDPRS";
String nerc_identifier "https://vocab.nerc.ac.uk/collection/P01/current/PRESPR01/";
String units "decibars";
}
CTDDEPTH {
Float32 _FillValue NaN;
Float32 actual_range 2.9, 5505.2;
String bcodmo_name "depth";
String description "CTD bottle firing depth; values added from the EPZT master file.";
String long_name "CTDDEPTH";
String nerc_identifier "https://vocab.nerc.ac.uk/collection/P09/current/DEPH/";
String units "meters";
}
}
NC_GLOBAL {
String access_formats ".htmlTable,.csv,.json,.mat,.nc,.tsv,.esriCsv,.geoJson,.odvTxt";
String acquisition_description
"Sampling: Full depth and super station samples were collected from the ship's
rosette. Samples were filtered through 0.8/0.45 um acropak5 00 filter
cartridges into triple-rinsed 60 mL HDPE bottles. Demi station samples were
collected from the GETORACES Go-Flo rosette. Samples were filtered through 0.2
um acropak capsule filters into triple-rinsed 60 mL HDPE bottles. Each sample
was collected in triplicate. Samples were frozen at -20 C immediately and
stored frozen until analysis.
Analysis: Samples were analyzed for nitrate d15N using the denitrifier method
(Sigman et al., 2001; Casciotti, et al., 2001, with technical updates
described by McIlvin and Casciotti, 2011). In the Casciotti Lab, Nitrate
isotope reference materials USGS32 and USGS34 were used to calibrate d15N.
Each sample was analyzed 2-6 times. Mean and standard deviations are reported
for each sample. Samples were analyzed either on a DeltaPLUS XP or DeltaV PLUS
isotope ratio mass spectrometer (IRMS), both with custom-built inlets
described in McIlvin and Casciotti, 2011. Where possible (concentrations
exceeded 2 uM), samples and standards were analyzed in 20 nanomole aliquots.
When NO3- concentrations were below 2 uM, samples were injected in maximum
volume (10 mL) and calibrated using interpolations between standard curves of
5 and 20 nano moles NO3-. Samples containing nitrate concentrations lower than
0.3 uM were not analyzed.\\u00a0Samples containing measurable NO2-
concentrations were treated with sulfuric acid prior to analysis (Granger and
Sigman, 2009).";
String awards_0_award_nid "650089";
String awards_0_award_number "OCE-1233339";
String awards_0_data_url "http://www.nsf.gov/awardsearch/showAward?AWD_ID=1233339";
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 cdm_data_type "Other";
String comment
"d15N-NO3
PI: Karen Casciotti (Stanford)
Co-PI: Mark Altabet (UMass Dartmouth)
Version: 24 June 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 "2016-06-24T19:21:08Z";
String date_modified "2020-03-31T17:56:37Z";
String defaultDataQuery "&time<now";
String doi "10.26008/1912/bco-dmo.650087.1";
Float64 Easternmost_Easting -77.37617;
Float64 geospatial_lat_max -10.25017;
Float64 geospatial_lat_min -16.00067;
String geospatial_lat_units "degrees_north";
Float64 geospatial_lon_max -77.37617;
Float64 geospatial_lon_min -152.0005;
String geospatial_lon_units "degrees_east";
Float64 geospatial_vertical_max 5500.3;
Float64 geospatial_vertical_min 2.9;
String geospatial_vertical_positive "down";
String geospatial_vertical_units "m";
String history
"2024-04-18T18:08:49Z (local files)
2024-04-18T18:08:49Z https://erddap.bco-dmo.org/erddap/tabledap/bcodmo_dataset_650087.html";
String infoUrl "https://www.bco-dmo.org/dataset/650087";
String institution "BCO-DMO";
String instruments_0_acronym "IR Mass Spec";
String instruments_0_dataset_instrument_description "Samples were analyzed either on a DeltaPLUS XP or DeltaV PLUS isotope ratio mass spectrometer (IRMS).";
String instruments_0_dataset_instrument_nid "650279";
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 "IRMS";
String instruments_1_acronym "GO-FLO Teflon TM";
String instruments_1_dataset_instrument_nid "650278";
String instruments_1_description "GO-FLO Teflon-lined Trace Metal free sampling bottles are used for collecting water samples for trace metal, nutrient and pigment analysis. The GO-FLO sampling bottle is designed specifically to avoid sample contamination at the surface, internal spring contamination, loss of sample on deck (internal seals), and exchange of water from different depths.";
String instruments_1_instrument_external_identifier "https://vocab.nerc.ac.uk/collection/L05/current/30/";
String instruments_1_instrument_name "GO-FLO Teflon Trace Metal Bottle";
String instruments_1_instrument_nid "533";
String instruments_1_supplied_name "Go-Flo";
String keywords "analyses, bco, bco-dmo, biological, bottle, btl, BTL_ISO_DATETIME_UTC, BTL_LAT, BTL_LON, btlnbr, BTLNBR_FLAG_W, btmdepth, castno, chemical, chemistry, concentration, cruise, cruise_id, ctddepth, ctdprs, data, dataset, datetime, delta, depth, DEPTH_PI, dmo, earth, Earth Science > Oceans > Ocean Chemistry > Nitrate, erddap, event, EVENT_LAT, EVENT_LON, eventno, flag, fmdepth, geotrc, GEOTRC_EVENTNO, GEOTRC_INSTR, GEOTRC_SAMPNO, instr, iso, management, mole, mole_concentration_of_nitrate_in_sea_water, n02, nitrate, no3, NO3_15_D_DELTA_BOTTLE, NO3_15_D_DELTA_BOTTLE_FLAG, NO3_15_D_DELTA_BOTTLE_STDEV, num, num_of_analyses, ocean, oceanography, oceans, odf, ODF_CTDPRS, office, preliminary, sampno, science, sea, seawater, smdepth, start, stnnbr, time, w, water";
String keywords_vocabulary "GCMD Science Keywords";
String license "https://www.bco-dmo.org/dataset/650087/license";
String metadata_source "https://www.bco-dmo.org/api/dataset/650087";
Float64 Northernmost_Northing -10.25017;
String param_mapping "{'650087': {'BTL_ISO_DATETIME_UTC': 'flag - time', 'EVENT_LAT': 'flag - latitude', 'DEPTH_PI': 'flag - depth', 'EVENT_LON': 'flag - longitude'}}";
String parameter_source "https://www.bco-dmo.org/mapserver/dataset/650087/parameters";
String people_0_affiliation "Stanford University";
String people_0_person_name "Karen L. Casciotti";
String people_0_person_nid "50980";
String people_0_role "Principal Investigator";
String people_0_role_type "originator";
String people_1_affiliation "University of Massachusetts Dartmouth";
String people_1_affiliation_acronym "UMASSD-SMAST";
String people_1_person_name "Mark A. Altabet";
String people_1_person_nid "50571";
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 "U.S. GEOTRACES EPZT,EPZT Nitrogen Isotopes";
String projects_0_acronym "U.S. GEOTRACES EPZT";
String projects_0_description
"From the NSF Award Abstract
The mission of the International GEOTRACES Program (www.geotraces.org), of which the U.S. chemical oceanography research community is a founding member, is \"to identify processes and quantify fluxes that control the distributions of key trace elements and isotopes in the ocean, and to establish the sensitivity of these distributions to changing environmental conditions\" (GEOTRACES Science Plan, 2006). In the United States, ocean chemists are currently in the process of organizing a zonal transect in the eastern tropical South Pacific (ETSP) from Peru to Tahiti as the second cruise of the U.S.GEOTRACES Program. This Pacific section includes a large area characterized by high rates of primary production and particle export in the eastern boundary associated with the Peru Upwelling, a large oxygen minimum zone that is a major global sink for fixed nitrogen, and a large hydrothermal plume arising from the East Pacific Rise. This particular section was selected as a result of open planning workshops in 2007 and 2008, with a final recommendation made by the U.S.GEOTRACES Steering Committee in 2009. It is the first part of a two-stage plan that will include a meridional section of the Pacific from Tahiti to Alaska as a subsequent expedition.
This award provides funding for management of the U.S.GEOTRACES Pacific campaign to a team of scientists from the University of Southern California, Old Dominion University, and the Woods Hole Oceanographic Institution. The three co-leaders will provide mission leadership, essential support services, and management structure for acquiring the trace elements and isotopes samples listed as core parameters in the International GEOTRACES Science Plan, plus hydrographic and nutrient data needed by participating investigators. With this support from NSF, the management team will (1) plan and coordinate the 52-day Pacific research cruise described above; (2) obtain representative samples for a wide variety of trace metals of interest using conventional CTD/rosette and GEOTRACES Sampling Systems; (3) acquire conventional JGOFS/WOCE-quality hydrographic data (CTD, transmissometer, fluorometer, oxygen sensor, etc) along with discrete samples for salinity, dissolved oxygen (to 1 uM detection limits), plant pigments, redox tracers such as ammonium and nitrite, and dissolved nutrients at micro- and nanomolar levels; (4) ensure that proper QA/QC protocols are followed and reported, as well as fulfilling all GEOTRACES Intercalibration protocols; (5) prepare and deliver all hydrographic-type data to the GEOTRACES Data Center (and US data centers); and (6) coordinate cruise communications between all participating investigators, including preparation of a hydrographic report/publication.
Broader Impacts: The project is part of an international collaborative program that has forged strong partnerships in the intercalibration and implementation phases that are unprecedented in chemical oceanography. The science product of these collective missions will enhance our ability to understand how to interpret the chemical composition of the ocean, and interpret how climate change will affect ocean chemistry. Partnerships include contributions to the infrastructure of developing nations with overlapping interests in the study area, in this case Peru. There is a strong educational component to the program, with many Ph.D. students carrying out thesis research within the program.
Figure 1. The 2013 GEOTRACES EPZT Cruise Track. [click on the image to view a larger version]";
String projects_0_end_date "2015-06";
String projects_0_geolocation "Eastern Tropical Pacific - Transect from Peru to Tahiti";
String projects_0_name "U.S. GEOTRACES East Pacific Zonal Transect";
String projects_0_project_nid "499723";
String projects_0_project_website "http://www.geotraces.org/";
String projects_0_start_date "2012-06";
String projects_1_acronym "EPZT Nitrogen Isotopes";
String projects_1_description
"Description from NSF award abstract:
Nitrogen (N) is an essential macronutrient whose availability can limit primary production and the capacity of the biological pump to export carbon from the surface ocean on seasonal, annual, decadal, and millennial timescales. The inventory of fixed (bioavailable) N in the ocean is driven by biological processes such as nitrogen fixation, denitrification, and anaerobic ammonia oxidation (anammox). Water column oxygen deficient zones (ODZs) are important sites for fixed N loss, as well as N2O production, and they are projected to expand and intensify in the coming years as global warming increases ocean stratification and decreases ventilation. It is important to understand the distribution of nitrate, nitrite, and N2O isotopes in relation to current ocean conditions of oxygen and trace element availability order to interpret past and future changes in nitrate signals.
In this project, a team of researchers from Stanford University, University of Massachusetts at Dartmouth, and Brown University will measure the nitrogen- and oxygen-isotopic composition (del15N and del18O) of nitrate, nitrite, and nitrous oxide in seawater samples collected along the GEOTRACES Pacific Peru-Tahiti Section. Values of del15N and del18O will also be measured in nitrate from aerosol and rain samples to inform our interpretation of the N isotope budget and isotopic gradients within the tropical South Pacific. Finally, N2/Ar and N2 del15N will be determined to close the N mass and isotope budgets. Nitrate del15N is a GEOTRACES \"core parameter\" that will complement other measurements, such as bioactive trace element concentrations and speciation, Si isotope variations, as well as redox and productivity proxies.
The GEOTRACES Peru-Tahiti section provides a rare opportunity to track the fate of the isotopic signals of N loss from one of the largest water column ODZs. Furthermore, little is known about the effect of N recycling through hydrothermal vents on nitrate isotopes in the deep ocean, and this section will allow quantitative tracking of this input. Together, these measurements will yield insight into the relative rates of modern N cycle processes and will provide background information for paleoceanographic applications.";
String projects_1_end_date "2017-02";
String projects_1_geolocation "East Pacific Zonal Transect";
String projects_1_name "GEOTRACES Peru-Tahiti Nitrogen Isotope Measurements";
String projects_1_project_nid "650090";
String projects_1_start_date "2013-03";
String publisher_name "Biological and Chemical Oceanographic Data Management Office (BCO-DMO)";
String publisher_type "institution";
String sourceUrl "(local files)";
Float64 Southernmost_Northing -16.00067;
String standard_name_vocabulary "CF Standard Name Table v55";
String subsetVariables "cruise_id";
String summary "Nitrate isotope data from R/V Thomas G. Thompson cruise TN303 in the Eastern Tropical Pacific in 2013 (U.S. GEOTRACES EPZT project).";
String time_coverage_end "2013-12-18T04:49:00.00Z";
String time_coverage_start "2013-10-29T01:56:00.00Z";
String title "Nitrate isotope data from R/V Thomas G. Thompson cruise TN303 in the Eastern Tropical Pacific in 2013 (U.S. GEOTRACES EPZT project)";
String version "1";
Float64 Westernmost_Easting -152.0005;
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.