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| Dataset Title: | [GT10-11 - delta 15N-NO3] - delta 15N of nitrate from R/V Knorr cruise KN199- 04 & KN204-01 in the Subtropical northern Atlantic Ocean from 2010-2011 (U.S. GEOTRACES NAT project) (U.S. GEOTRACES North Atlantic Transect) 
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| Institution: | BCO-DMO (Dataset ID: bcodmo_dataset_3913) |
| Information: | Summary
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| FGDC
| ISO 19115
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Attributes {
s {
cruise_id {
String bcodmo_name "cruise_id";
String description "Official cruise identifier e.g. KN199-04 = R/V Knorr cruise number 199-04.";
String long_name "Cruise Id";
String units "text";
}
year {
Int16 _FillValue 32767;
Int16 actual_range 2010, 2011;
String bcodmo_name "year";
String description "4-digit year. in the format YYYY";
String long_name "Year";
String nerc_identifier "https://vocab.nerc.ac.uk/collection/P01/current/YEARXXXX/";
String units "unitless";
}
station_GEOTRC {
Byte _FillValue 127;
String _Unsigned "false";
Byte actual_range 1, 24;
String bcodmo_name "station";
String description
"GEOTRACES station number; ranges from 1 through 12 for KN199-04 and 1 through 24 for KN204-01. Stations 7 and 9 were skipped on KN204-01. PI-supplied values were identical to those in the intermediate
US GEOTRACES master file. Originally submitted as 'Station', this parameter name has been changed to conform to BCO-DMO's GEOTRACES naming conventions.";
String long_name "Station GEOTRC";
String units "dimensionless";
}
depth {
String _CoordinateAxisType "Height";
String _CoordinateZisPositive "down";
Float64 _FillValue NaN;
Float64 actual_range 9.5, 5815.3;
String axis "Z";
String bcodmo_name "depth";
Float64 colorBarMaximum 8000.0;
Float64 colorBarMinimum -8000.0;
String colorBarPalette "TopographyDepth";
String description
"Observation/sample depth in meters, calculated from CTD pressure. PI-supplied values were identical to those in the
intermediate US GEOTRACES master file. Originally submitted as 'CTD Depth', this parameter name has been changed to conform to BCO-DMO's GEOTRACES naming conventions.";
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";
}
press {
Float32 _FillValue NaN;
Float32 actual_range 9.6, 5958.6;
String bcodmo_name "pressure";
String description "Pressure (dbars) from CTD.";
String long_name "Press";
String nerc_identifier "https://vocab.nerc.ac.uk/collection/P01/current/PRESPR01/";
String units "decibars";
}
event_GEOTRC {
Int16 _FillValue 32767;
Int16 actual_range 2008, 3281;
String bcodmo_name "event";
String description
"Unique identifying number for US GEOTRACES sampling events; ranges from 2001 to 2225 for KN199-04 events and from 3001 to 3282 for KN204-01 events. PI-supplied values were identical to those in the intermediate
US GEOTRACES master file. Originally submitted as 'Event number', this parameter name has been changed to conform to BCO-DMO's GEOTRACES naming conventions.";
String long_name "Event GEOTRC";
String nerc_identifier "https://vocab.nerc.ac.uk/collection/P01/current/EVTAGFL/";
String units "dimensionless";
}
cast_GEOTRC {
Byte _FillValue 127;
String _Unsigned "false";
Byte actual_range 1, 9;
String bcodmo_name "cast";
String description "Cast identifier, numbered consecutively within a station. PI-supplied values were identical to those in the intermediate US GEOTRACES master file. Originally submitted as 'Cast', this parameter name has been changed to conform to BCO-DMO's GEOTRACES naming conventions.";
String long_name "Cast GEOTRC";
String units "dimensionless";
}
sample_GEOTRC {
Int16 _FillValue 32767;
Int16 actual_range 5075, 8140;
String bcodmo_name "sample";
String description
"Unique identifying number for US GEOTRACES samples; ranges from 5033 to 6078 for KN199-04 and from 6112 to 8148 for KN204-01. PI-supplied values were identical to those in the
intermediate US GEOTRACES master file. Originally submitted as 'GEOTRACES ID', this parameter name has been changed to conform to BCO-DMO's GEOTRACES naming conventions.";
String long_name "Sample GEOTRC";
String nerc_identifier "https://vocab.nerc.ac.uk/collection/P02/current/ACYC/";
String units "dimensionless";
}
sample_bottle_GEOTRC {
Byte _FillValue 127;
String _Unsigned "false";
Byte actual_range 1, 23;
String bcodmo_name "bot_Nis";
String description
"Unique identification numbers given to samples taken from bottles; rangies from 1 to 24; often used synonymously with bottle number. PI-supplied values were identical to those in the
intermediate US GEOTRACES master file. Originally submitted as 'Sample #', this parameter name has been changed to conform to BCO-DMO's GEOTRACES naming conventions.";
String long_name "Sample Bottle GEOTRC";
String units "dimensionless";
}
bottle_GEOTRC {
String bcodmo_name "bottle";
String description "Alphanumeric characters identifying bottle type (e.g., NIS representing Niskin and GF representing GOFLO) and position on a CTD rosette. PI-supplied values were identical to those in the intermediate US GEOTRACES master file. Originally submitted as 'Bottle number', this parameter name has been changed to conform to BCO-DMO's GEOTRACES naming conventions.";
String long_name "Bottle GEOTRC";
String units "dimensionless";
}
month_gmt {
Byte _FillValue 127;
String _Unsigned "false";
Byte actual_range 10, 12;
String bcodmo_name "month_gmt";
String description "2-digit month of year (GMT). in the format mm (01 to 12)";
String long_name "Month Gmt";
String units "unitless";
}
day_gmt {
String bcodmo_name "day_gmt";
String description "2-digit day of month (GMT). in the format dd (01 to 31)";
String long_name "Day Gmt";
String units "unitless";
}
time_gmt {
String bcodmo_name "time_gmt";
String description "Time (GMT) in hours and minutes when the event occurred; 24-hour clock. in the format HHMM";
String long_name "Time Gmt";
String units "unitless";
}
latitude {
String _CoordinateAxisType "Lat";
Float64 _FillValue NaN;
Float64 actual_range 17.3497, 39.7014;
String axis "Y";
String bcodmo_name "latitude";
Float64 colorBarMaximum 90.0;
Float64 colorBarMinimum -90.0;
String description "Latitude in decimal degrees. North = 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 -69.8644, -9.6601;
String axis "X";
String bcodmo_name "longitude";
Float64 colorBarMaximum 180.0;
Float64 colorBarMinimum -180.0;
String description "Longitude in decimal degrees. West = Negative.";
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";
}
d15N_NO3 {
Float32 _FillValue NaN;
Float32 actual_range 2.22, 14.58;
String bcodmo_name "dN15_NO3";
Float64 colorBarMaximum 50.0;
Float64 colorBarMinimum 0.0;
String description "Nitrate delta 15N, reported in units of permil vs. atmospheric N2.";
String long_name "Mole Concentration Of Nitrate In Sea Water";
String units "per mil";
}
d15N_NO3_sd {
Float32 _FillValue NaN;
Float32 actual_range 0.0, 1.75;
String bcodmo_name "standard deviation";
Float64 colorBarMaximum 50.0;
Float64 colorBarMinimum 0.0;
String description "Standard deviation of d15N_NO3.";
String long_name "D15 N NO3 Sd";
String units "per mil";
}
n {
Byte _FillValue 127;
String _Unsigned "false";
Byte actual_range 2, 6;
String bcodmo_name "numb_obs";
String description "n; number of observations/measurements.";
String long_name "N";
String units "dimensionless";
}
flag_low_area {
String bcodmo_name "q_flag";
String description "Samples that contained major ion peak areas (m/z 44) less than 1 volt-second are flagged at \"low area\". The flagged samples should be treated with caution.";
String long_name "Flag Low Area";
String units "dimensionless";
}
flag_low_conc {
String bcodmo_name "q_flag";
String description "Samples analyzed with concentrations below 0.3 uM are were flagged as \"low concentration\". The flagged samples should be treated with caution.";
String long_name "Flag Low Conc";
String units "dimensionless";
}
ISO_DateTime_UTC {
String bcodmo_name "ISO_DateTime_UTC";
String description "Date/Time (UTC) of the cast formatted to the ISO8601 standard. T indicates start of time string; Z indicates UTC. in the format YYYY-mm-ddTHH:MM:SS.ssZ";
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 time_precision "1970-01-01T00:00:00.00Z";
String units "unitless";
}
time {
String _CoordinateAxisType "Time";
Float64 actual_range 1.28719608e+9, NaN;
String axis "T";
String bcodmo_name "ISO_DateTime_UTC";
String description
"Date and time (UTC) that the bottle was fired, in ISO compliant format. Values were added from the intermediate US GEOTRACES master file (see Processing Description). This standard is based on
ISO 8601:2004(E) and takes on the following form: 2009-08-30T14:05:00[.xx]Z (UTC time)";
String ioos_category "Time";
String long_name "BTL ISO Date Time 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 units "seconds since 1970-01-01T00:00:00Z";
}
}
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 acropak500 filter cartridges into
triple-rinsed 60 mL HDPE bottles. Demi station samples were collected from the
GEOTRACES 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 and d18O using the denitrifier method
(Sigman et al., 2001; Casciotti, et al., 2001, with technical updates
described by McIlvin and Casciotti, 2011). Nitrate isotope reference materials
USGS32, USGS34, and USGS35 were used to calibrate d18O and USGS32 and USGS34
to calibrate d15N. Each sample was analyzed 2-6 times. Mean and standard
deviations are reported for each sample. All samples were analyzed on a
DeltaPLUS XP isotope ratio mass spectrometer, with custom-built inlet
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-. Some
samples contained nitrate concentrations lower than the typical analytical
window (300 nM NO3-), but were analyzed nonetheless. Samples analyzed with
concentrations below 0.3 uM are were flagged as \\\"low concentration\\\". These
samples contained a subset with major ion peak areas (m/z 44) less than 1
volt-second, which are flagged at \\\"low area\\\". Two of these samples are
flagged as having elevated d18O-NO3 values relative to their d15N-NO3 values.
The flagged samples should be treated with caution.
This version (16 March 2013) has not been thoroughly intercalibrated with data
from the Sigman Lab. Currently, there exists no detachable d15N offset between
the datasets. However, Casciotti d18O data are approximately 0.6 permil higher
than Sigman d18O data.";
String awards_0_award_nid "55172";
String awards_0_award_number "OCE-1138360";
String awards_0_data_url "http://nsf.gov/awardsearch/showAward?AWD_ID=1138360";
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
"delta 15N of NO3 from GT10 and GT11
PI: Karen Casciotti (Stanford)
Co-PI: Daniel Sigman (Princeton)
Version: 29 April 2013";
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 "2013-04-15T20:11:39Z";
String date_modified "2020-03-31T17:21:09Z";
String defaultDataQuery "&time<now";
String doi "10.26008/1912/bco-dmo.3913.1";
Float64 Easternmost_Easting -9.6601;
Float64 geospatial_lat_max 39.7014;
Float64 geospatial_lat_min 17.3497;
String geospatial_lat_units "degrees_north";
Float64 geospatial_lon_max -9.6601;
Float64 geospatial_lon_min -69.8644;
String geospatial_lon_units "degrees_east";
Float64 geospatial_vertical_max 5815.3;
Float64 geospatial_vertical_min 9.5;
String geospatial_vertical_positive "down";
String geospatial_vertical_units "m";
String history
"2024-11-21T08:29:50Z (local files)
2024-11-21T08:29:50Z https://erddap.bco-dmo.org/erddap/tabledap/bcodmo_dataset_3913.html";
String infoUrl "https://www.bco-dmo.org/dataset/3913";
String institution "BCO-DMO";
String instruments_0_acronym "GO-FLO";
String instruments_0_dataset_instrument_description "Demi station samples were collected from the GEOTRACES GO-FLO rosette. The U.S. GEOTRACES sampling system consisted of 24 Teflon-coated GO-FLO bottles.";
String instruments_0_dataset_instrument_nid "6137";
String instruments_0_description "GO-FLO bottle cast used to collect water samples for pigment, nutrient, plankton, etc. The GO-FLO sampling bottle is specially designed 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_0_instrument_external_identifier "https://vocab.nerc.ac.uk/collection/L05/current/30/";
String instruments_0_instrument_name "GO-FLO Bottle";
String instruments_0_instrument_nid "411";
String instruments_0_supplied_name "GO-FLO Bottle";
String instruments_1_acronym "Niskin bottle";
String instruments_1_dataset_instrument_nid "6138";
String instruments_1_description "A Niskin bottle (a next generation water sampler based on the Nansen bottle) is a cylindrical, non-metallic water collection device with stoppers at both ends. The bottles can be attached individually on a hydrowire or deployed in 12, 24 or 36 bottle Rosette systems mounted on a frame and combined with a CTD. Niskin bottles are used to collect discrete water samples for a range of measurements including pigments, nutrients, plankton, etc.";
String instruments_1_instrument_external_identifier "https://vocab.nerc.ac.uk/collection/L22/current/TOOL0412/";
String instruments_1_instrument_name "Niskin bottle";
String instruments_1_instrument_nid "413";
String instruments_1_supplied_name "Niskin bottle";
String instruments_2_acronym "IR Mass Spec";
String instruments_2_dataset_instrument_description "All samples were analyzed on a DeltaPLUS XP isotope ratio mass spectrometer, with custom-built inlet described in McIlvin and Casciotti, 2011.";
String instruments_2_dataset_instrument_nid "6139";
String instruments_2_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_2_instrument_external_identifier "https://vocab.nerc.ac.uk/collection/L05/current/LAB16/";
String instruments_2_instrument_name "Isotope-ratio Mass Spectrometer";
String instruments_2_instrument_nid "469";
String instruments_2_supplied_name "Isotope-ratio Mass Spectrometer";
String keywords "area, bco, bco-dmo, biological, bottle, bottle_GEOTRC, btl, BTL_ISO_DateTime_UTC, cast, cast_GEOTRC, chemical, chemistry, conc, concentration, cruise, cruise_id, d15, d15N_NO3, d15N_NO3_sd, data, dataset, date, day, day_gmt, depth, depth_GEOTRC_CTD, dmo, earth, Earth Science > Oceans > Ocean Chemistry > Nitrate, erddap, event, event_GEOTRC, flag, flag_low_area, flag_low_conc, geotrc, iso, latitude, longitude, low, management, mole, mole_concentration_of_nitrate_in_sea_water, month, month_gmt, n02, nitrate, no3, ocean, oceanography, oceans, office, preliminary, press, sample, sample_bottle_GEOTRC, sample_GEOTRC, science, sea, seawater, station, station_GEOTRC, time, time_gmt, water, year";
String keywords_vocabulary "GCMD Science Keywords";
String license "https://www.bco-dmo.org/dataset/3913/license";
String metadata_source "https://www.bco-dmo.org/api/dataset/3913";
Float64 Northernmost_Northing 39.7014;
String param_mapping "{'3913': {'depth_GEOTRC_CTD': 'flag - depth', 'lat': 'flag - latitude', 'BTL_ISO_DateTime_UTC': 'flag - time', 'lon': 'flag - longitude'}}";
String parameter_source "https://www.bco-dmo.org/mapserver/dataset/3913/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 "Princeton University";
String people_1_person_name "Daniel M. Sigman";
String people_1_person_nid "51417";
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 NAT";
String projects_0_acronym "U.S. GEOTRACES NAT";
String projects_0_description
"Much of this text appeared in an article published in OCB News, October 2008, by the OCB Project Office.
The first U.S. GEOTRACES Atlantic Section will be specifically centered around a sampling cruise to be carried out in the North Atlantic in 2010. Ed Boyle (MIT) and Bill Jenkins (WHOI) organized a three-day planning workshop that was held September 22-24, 2008 at the Woods Hole Oceanographic Institution. The main goal of the workshop, sponsored by the National Science Foundation and the U.S. GEOTRACES Scientific Steering Committee, was to design the implementation plan for the first U.S. GEOTRACES Atlantic Section. The primary cruise design motivation was to improve knowledge of the sources, sinks and internal cycling of Trace Elements and their Isotopes (TEIs) by studying their distributions along a section in the North Atlantic (Figure 1). The North Atlantic has the full suite of processes that affect TEIs, including strong meridional advection, boundary scavenging and source effects, aeolian deposition, and the salty Mediterranean Outflow. The North Atlantic is particularly important as it lies at the \"origin\" of the global Meridional Overturning Circulation.
It is well understood that many trace metals play important roles in biogeochemical processes and the carbon cycle, yet very little is known about their large-scale distributions and the regional scale processes that affect them. Recent advances in sampling and analytical techniques, along with advances in our understanding of their roles in enzymatic and catalytic processes in the open ocean provide a natural opportunity to make substantial advances in our understanding of these important elements. Moreover, we are motivated by the prospect of global change and the need to understand the present and future workings of the ocean's biogeochemistry. The GEOTRACES strategy is to measure a broad suite of TEIs to constrain the critical biogeochemical processes that influence their distributions. In addition to these \"exotic\" substances, more traditional properties, including macronutrients (at micromolar and nanomolar levels), CTD, bio-optical parameters, and carbon system characteristics will be measured. The cruise starts at Line W, a repeat hydrographic section southeast of Cape Cod, extends to Bermuda and subsequently through the North Atlantic oligotrophic subtropical gyre, then transects into the African coast in the northern limb of the coastal upwelling region. From there, the cruise goes northward into the Mediterranean outflow. The station locations shown on the map are for the \"fulldepth TEI\" stations, and constitute approximately half of the stations to be ultimately occupied.
Figure 1. The proposed 2010 Atlantic GEOTRACES cruise track plotted on dissolved oxygen at 400 m depth. Data from the World Ocean Atlas (Levitus et al., 2005) were plotted using Ocean Data View (courtesy Reiner Schlitzer). [click on the image to view a larger version]
Hydrography, CTD and nutrient measurements will be supported by the Ocean Data Facility (J. Swift) at Scripps Institution of Oceanography and funded through NSF Facilities. They will be providing an additional CTD rosette system along with nephelometer and LADCP. A trace metal clean Go-Flo Rosette and winch will be provided by the group at Old Dominion University (G. Cutter) along with a towed underway pumping system.
The North Atlantic Transect cruise began in 2010 with KN199 leg 4 (station sampling) and leg 5 (underway sampling only) (Figure 2).
KN199-04 Cruise Report (PDF)
Figure 2. The red line shows the cruise track for the first leg of the US Geotraces North Atlantic Transect on the R/V Knorr in October 2010. The rest of the stations (beginning with 13) will be completed in October-December 2011 on the R/V Knorr (courtesy of Bill Jenkins, Chief Scientist, GNAT first leg). [click on the image to view a larger version]
The section completion effort resumed again in November 2011 with KN204-01A,B (Figure 3).
KN204-01A,B Cruise Report (PDF)
Figure 3. Station locations occupied on the US Geotraces North Atlantic Transect on the R/V Knorr in November 2011. [click on the image to view a larger version]
Data from the North Atlantic Transect cruises are available under the Datasets heading below, and consensus values for the SAFe and North Atlantic GEOTRACES Reference Seawater Samples are available from the GEOTRACES Program Office: Standards and Reference Materials
ADCP data are available from the Currents ADCP group at the University of Hawaii at the links below:KN199-04 (leg 1 of 2010 cruise; Lisbon to Cape Verde)KN199-05 (leg 2 of 2010 cruise; Cape Verde to Charleston, NC)KN204-01A (part 1 of 2011 cruise; Woods Hole, MA to Bermuda)KN204-01B (part 2 of 2011 cruise; Bermuda to Cape Verde)";
String projects_0_end_date "2013-08";
String projects_0_geolocation "Subtropical western and eastern North Atlantic Ocean";
String projects_0_name "U.S. GEOTRACES North Atlantic Transect";
String projects_0_project_nid "2066";
String projects_0_project_website "https://www.geotraces.org/";
String projects_0_start_date "2010-10";
String publisher_name "Biological and Chemical Oceanographic Data Management Office (BCO-DMO)";
String publisher_type "institution";
String sourceUrl "(local files)";
Float64 Southernmost_Northing 17.3497;
String standard_name_vocabulary "CF Standard Name Table v55";
String summary "Dataset includes delta 15N of nitrate (NO3) measurements from the GT10 and GT11 (KN199-04 and KN204-01) U.S. GEOTRACES North Atlantic Transect cruises.";
String time_coverage_start "2010-10-16T02:28:00Z";
String title "[GT10-11 - delta 15N-NO3] - delta 15N of nitrate from R/V Knorr cruise KN199-04 & KN204-01 in the Subtropical northern Atlantic Ocean from 2010-2011 (U.S. GEOTRACES NAT project) (U.S. GEOTRACES North Atlantic Transect)";
String version "1";
Float64 Westernmost_Easting -69.8644;
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.