Accessing BCO-DMO data
Brought to you by BCO-DMO
|
|
BCO-DMO ERDDAP
Accessing BCO-DMO data |
log in
Brought to you by BCO-DMO |
| Dataset Title: | [GP15 Be-7 Leg 1] - Aerosol and seawater beryllium-7 concentrations from Leg 1 (Seattle, WA to Hilo, HI) of the US GEOTRACES Pacific Meridional Transect (PMT) cruise (GP15, RR1814) on R/V Roger Revelle from September to October 2018 (US GEOTRACES Pacific Meridional Transect) 
|
| Institution: | BCO-DMO (Dataset ID: bcodmo_dataset_781794) |
| Information: | Summary
| License
| FGDC
| ISO 19115
| Metadata
| Background
| Files
| Make a graph
|
Attributes {
s {
Station_ID {
Byte _FillValue 127;
String _Unsigned "false";
Byte actual_range 4, 18;
String bcodmo_name "station";
String description "Station number";
String long_name "Station ID";
String units "unitless";
}
Start_Date_UTC {
String bcodmo_name "date";
String description "Start date (UTC); format: YYYY-mm-dd";
String long_name "Start Date UTC";
String nerc_identifier "https://vocab.nerc.ac.uk/collection/P01/current/ADATAA01/";
String time_precision "1970-01-01";
String units "unitless";
}
Start_Time_UTC {
String bcodmo_name "time";
String description "Start time (UTC); format: HH:MM";
String long_name "Start Time UTC";
String nerc_identifier "https://vocab.nerc.ac.uk/collection/P01/current/AHMSAA01/";
String units "unitless";
}
time {
String _CoordinateAxisType "Time";
Float64 actual_range 1.5374058e+9, 1.5399873e+9;
String axis "T";
String bcodmo_name "ISO_DateTime_UTC";
String description "Start date and time (UTC) formatted to ISO8601 standard; format: YYYY-mm-ddTHH:MMZ";
String ioos_category "Time";
String long_name "Start ISO Date Time UTC";
String nerc_identifier "https://vocab.nerc.ac.uk/collection/P01/current/DTUT8601/";
String source_name "Start_ISO_DateTime_UTC";
String standard_name "time";
String time_origin "01-JAN-1970 00:00:00";
String time_precision "1970-01-01T00:00Z";
String units "seconds since 1970-01-01T00:00:00Z";
}
End_Date_UTC {
String bcodmo_name "date";
String description "End date (UTC); format: YYYY-mm-dd";
String long_name "End Date UTC";
String nerc_identifier "https://vocab.nerc.ac.uk/collection/P01/current/ADATAA01/";
String units "unitless";
}
End_Time_UTC {
String bcodmo_name "time";
String description "End time (UTC); format: HH:MM";
String long_name "End Time UTC";
String nerc_identifier "https://vocab.nerc.ac.uk/collection/P01/current/AHMSAA01/";
String units "unitless";
}
End_ISO_DateTime_UTC {
String bcodmo_name "ISO_DateTime_UTC";
String description "End date and time (UTC) formatted to ISO8601 standard; format: YYYY-mm-ddTHH:MMZ";
String long_name "End ISO Date Time UTC";
String nerc_identifier "https://vocab.nerc.ac.uk/collection/P01/current/DTUT8601/";
String units "unitless";
}
latitude {
String _CoordinateAxisType "Lat";
Float64 _FillValue NaN;
Float64 actual_range 22.0, 55.08;
String axis "Y";
String bcodmo_name "latitude";
Float64 colorBarMaximum 90.0;
Float64 colorBarMinimum -90.0;
String description "Start 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 source_name "Start_Latitude";
String standard_name "latitude";
String units "degrees_north";
}
longitude {
String _CoordinateAxisType "Lon";
Float64 _FillValue NaN;
Float64 actual_range -155.72, -129.04;
String axis "X";
String bcodmo_name "longitude";
Float64 colorBarMaximum 180.0;
Float64 colorBarMinimum -180.0;
String description "Start 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 source_name "Start_Longitude";
String standard_name "longitude";
String units "degrees_east";
}
End_Latitude {
Float32 _FillValue NaN;
Float32 actual_range 22.0, 54.66;
String bcodmo_name "latitude";
Float64 colorBarMaximum 90.0;
Float64 colorBarMinimum -90.0;
String description "End latitude; positive values = North";
String long_name "Latitude";
String nerc_identifier "https://vocab.nerc.ac.uk/collection/P09/current/LATX/";
String standard_name "latitude";
String units "decimal degrees";
}
End_Longitude {
Float32 _FillValue NaN;
Float32 actual_range -155.17, -135.286;
String bcodmo_name "longitude";
Float64 colorBarMaximum 180.0;
Float64 colorBarMinimum -180.0;
String description "End longitude; positive values = East";
String long_name "Longitude";
String nerc_identifier "https://vocab.nerc.ac.uk/collection/P09/current/LONX/";
String standard_name "longitude";
String units "decimal degrees";
}
Event_ID {
Int16 _FillValue 32767;
Int16 actual_range 6504, 6766;
String bcodmo_name "event";
String description "Event number";
String long_name "Event ID";
String nerc_identifier "https://vocab.nerc.ac.uk/collection/P01/current/EVTAGFL/";
String units "unitless";
}
Sample_ID {
Int16 _FillValue 32767;
Int16 actual_range 12318, 13866;
String bcodmo_name "sample";
String description "GEOTRACES sample number";
String long_name "Sample ID";
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 17.0, 137.0;
String axis "Z";
String bcodmo_name "depth";
String description "Sample depth";
String ioos_category "Location";
String long_name "Sample Depth";
String nerc_identifier "https://vocab.nerc.ac.uk/collection/P09/current/DEPH/";
String positive "down";
String standard_name "depth";
String units "m";
}
Be_7_A_T_CONC_HIVOL_pv5z9e {
Float32 _FillValue NaN;
Float32 actual_range 0.3067, 4.8917;
String bcodmo_name "metal_conc_air";
String description "Concentration (or activity) for total Be-7 in aerosols (No leaching)";
String long_name "Be 7 A T CONC HIVOL Pv5z9e";
String nerc_identifier "https://vocab.nerc.ac.uk/collection/P02/current/MTAT/";
String units "milliBecquerel per cubic meter (mBq/m3)";
}
SD1_Be_7_A_T_CONC_HIVOL_pv5z9e {
Float32 _FillValue NaN;
Float32 actual_range 0.0255, 0.1565;
String bcodmo_name "metal_conc_air";
String description "One standard deviation of Be_7_A_T_CONC_HIVOL_pv5z9e";
String long_name "SD1 Be 7 A T CONC HIVOL Pv5z9e";
String nerc_identifier "https://vocab.nerc.ac.uk/collection/P02/current/MTAT/";
String units "mBq/m3";
}
Flag_Be_7_A_T_CONC_HIVOL_pv5z9e {
Byte _FillValue 127;
String _Unsigned "false";
Byte actual_range 2, 2;
String bcodmo_name "q_flag";
Float64 colorBarMaximum 150.0;
Float64 colorBarMinimum 0.0;
String description "Quality flag for Be_7_A_T_CONC_HIVOL_pv5z9e";
String long_name "Flag Be 7 A T CONC HIVOL Pv5z9e";
String units "unitless";
}
Be_7_D_CONC_PUMP_kzmaqr {
Int16 _FillValue 32767;
Int16 actual_range 11, 8480;
String bcodmo_name "trace_metal_conc";
String description "Seawater Be-7 activity or concentration";
String long_name "Be 7 D CONC PUMP Kzmaqr";
String nerc_identifier "https://vocab.nerc.ac.uk/collection/P03/current/C035/";
String units "microBecquerels per kilogram (uBq/kg)";
}
SD1_Be_7_D_CONC_PUMP_kzmaqr {
Float32 _FillValue NaN;
Float32 actual_range 65.7, 450.0;
String bcodmo_name "trace_metal_conc";
String description "One standard deviation of Be_7_D_CONC_PUMP_kzmaqr";
String long_name "SD1 Be 7 D CONC PUMP Kzmaqr";
String nerc_identifier "https://vocab.nerc.ac.uk/collection/P03/current/C035/";
String units "uBq/kg";
}
Flag_Be_7_D_CONC_PUMP_kzmaqr {
Byte _FillValue 127;
String _Unsigned "false";
Byte actual_range 2, 2;
String bcodmo_name "q_flag";
Float64 colorBarMaximum 150.0;
Float64 colorBarMinimum 0.0;
String description "Quality flag for Be_7_D_CONC_PUMP_kzmaqr";
String long_name "Flag Be 7 D CONC PUMP Kzmaqr";
String units "unitless";
}
}
NC_GLOBAL {
String access_formats ".htmlTable,.csv,.json,.mat,.nc,.tsv,.esriCsv,.geoJson,.odvTxt";
String acquisition_description
"Be-7 Aerosol:
Aerosol samples were collected between Sept 20, 2018 and Nov 23, 2018 during
the U.S. GEOTRACES PMT cruise, R/V Roger Revelle (RR1814), 18 September 2018 -
24 November 2018, Seattle, Washington - Papeete, Tahiti, French Polynesia
(with a port stop in Hilo, Hawaii, 21-25, October 2018). Aerosol samples were
obtained with a Tisch TE-5170V-BL high volume aerosol sampler, modified to
collect 12 replicate samples on acid-washed (Wallace et al, 1977; Baker et
al., 2006) 47mm diameter Whatman-41 (W-41) filters, using procedures of the US
GEOTRACES aerosol program (Morton et al., 2013). In order to minimize the
filter blanks for our experiment, the W-41 filters were pre-cleaned before
deployment using three cycles of leaching with 0.5M HCl (Optima) then rinsing
with ultra-high purity water (UHP water) according to trace element protocols
in a HEPA-filtered laminar flow hood (Morton et al., 2013; similar to Baker et
al., 2006).
For 7Be, three of the 47mm aerosol samples were stacked in a plastic Petri
dish and counted by gamma spectroscopy. Be-7 has a readily identifiable gamma
peak at 478 keV. The counting system was calibrated for all samples by
preparing a commercial standard in geometry identical to the samples.
Be-7 Seawater:
A weighted sampling hose, attached to a submersible pump with a portable ctd
was deployed over the aft of the ship to collect seawater for Be-7 analysis.
The seawater was collected in plastic 700 liter holding tanks and then passed
through iron-oxide impregnated acrylic fiber filters (adsorbs Be-7). The
efficiency of the fiber for extraction of Be from seawater was determined by
adding stable Be atomic absorption standards to a drum containing seawater,
pumping the water through an iron fiber cartridge, and at every 100 L
measuring the Be content of the cartridge effluent. Based on several trials,
it was found that for sample volumes in the range 400-700L, extraction
efficiencies are respectively, 82 \\u00b1 3% to 76 \\u00b1 2%.\\u00a0
All fibers were returned to the lab where they were dried and ashed. Fiber
samples were pressed into pellets. All samples were then placed over a low
background germanium gamma detector. 7Be has a readily identifiable peak at
478keV. The detector is calibrated for these samples by adding a commercially
prepared mixed solution of known gamma activities to ashed fiber and counting
in the appropriate geometry.";
String awards_0_award_nid "781789";
String awards_0_award_number "OCE-1736319";
String awards_0_data_url "http://www.nsf.gov/awardsearch/showAward.do?AwardNumber=1736319";
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
"Aerosol & Seawater Be-7
GEOTRACES PMT (GP15) Leg 1
PI: David Kadko (Florida International University)
Version date: 20-April-2020";
String Conventions "COARDS, CF-1.6, ACDD-1.3";
String creator_email "info@bco-dmo.org";
String creator_name "BCO-DMO";
String creator_type "institution";
String creator_url "https://www.bco-dmo.org/";
String data_source "extract_data_as_tsv version 2.3 19 Dec 2019";
String date_created "2019-11-15T18:35:23Z";
String date_modified "2020-04-21T19:03:46Z";
String defaultDataQuery "&time<now";
String doi "10.26008/1912/bco-dmo.781794.1";
Float64 Easternmost_Easting -129.04;
Float64 geospatial_lat_max 55.08;
Float64 geospatial_lat_min 22.0;
String geospatial_lat_units "degrees_north";
Float64 geospatial_lon_max -129.04;
Float64 geospatial_lon_min -155.72;
String geospatial_lon_units "degrees_east";
Float64 geospatial_vertical_max 137.0;
Float64 geospatial_vertical_min 17.0;
String geospatial_vertical_positive "down";
String geospatial_vertical_units "m";
String history
"2024-11-21T08:39:06Z (local files)
2024-11-21T08:39:06Z https://erddap.bco-dmo.org/erddap/tabledap/bcodmo_dataset_781794.html";
String infoUrl "https://www.bco-dmo.org/dataset/781794";
String institution "BCO-DMO";
String instruments_0_acronym "Aerosol_Sampler";
String instruments_0_dataset_instrument_description "Aerosol samples were obtained with a Tisch TE-5170V-BL high volume aerosol sampler, modified to collect 12 replicate samples on acid-washed 47mm diameter Whatman-41 (W-41) filters, using procedures of the US GEOTRACES aerosol program.";
String instruments_0_dataset_instrument_nid "781799";
String instruments_0_description "A device that collects a sample of aerosol (dry particles or liquid droplets) from the atmosphere.";
String instruments_0_instrument_external_identifier "https://vocab.nerc.ac.uk/collection/L05/current/13/";
String instruments_0_instrument_name "Aerosol Sampler";
String instruments_0_instrument_nid "691";
String instruments_0_supplied_name "Tisch TE-5170V-BL high volume aerosol sampler";
String instruments_1_dataset_instrument_description "A weighted sampling hose, attached to a submersible pump with a portable ctd was deployed over the aft of the ship to collect seawater for Be-7 analysis.";
String instruments_1_dataset_instrument_nid "809708";
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_2_dataset_instrument_description "For 7Be, three of the 47mm aerosol samples were stacked in a plastic Petri dish and counted by gamma spectroscopy";
String instruments_2_dataset_instrument_nid "781800";
String instruments_2_description "Instruments measuring the relative levels of electromagnetic radiation of different wavelengths in the gamma-ray waveband.";
String instruments_2_instrument_name "Gamma Ray Spectrometer";
String instruments_2_instrument_nid "670659";
String instruments_2_supplied_name "gamma spectroscopy";
String keywords "bco, bco-dmo, Be_7_A_T_CONC_HIVOL_pv5z9e, Be_7_D_CONC_PUMP_kzmaqr, biological, chemical, conc, data, dataset, date, depth, dmo, end, End_Date_UTC, End_ISO_DateTime_UTC, End_Latitude, End_Longitude, End_Time_UTC, erddap, event, Event_ID, flag, Flag_Be_7_A_T_CONC_HIVOL_pv5z9e, Flag_Be_7_D_CONC_PUMP_kzmaqr, hivol, iso, kzmaqr, latitude, longitude, management, oceanography, office, preliminary, pump, pv5z9e, sample, Sample_Depth, Sample_ID, sd1, SD1_Be_7_A_T_CONC_HIVOL_pv5z9e, SD1_Be_7_D_CONC_PUMP_kzmaqr, start, Start_Date_UTC, Start_Time_UTC, station, Station_ID, time";
String license "https://www.bco-dmo.org/dataset/781794/license";
String metadata_source "https://www.bco-dmo.org/api/dataset/781794";
Float64 Northernmost_Northing 55.08;
String param_mapping "{'781794': {'Start_ISO_DateTime_UTC': 'flag - time', 'Sample_Depth': 'flag - depth', 'Start_Longitude': 'flag - longitude', 'Start_Latitude': 'flag - latitude'}}";
String parameter_source "https://www.bco-dmo.org/mapserver/dataset/781794/parameters";
String people_0_affiliation "Florida International University";
String people_0_affiliation_acronym "FIU";
String people_0_person_name "David C. Kadko";
String people_0_person_nid "50615";
String people_0_role "Principal Investigator";
String people_0_role_type "originator";
String people_1_person_name "Shannon Rauch";
String people_1_person_nid "51498";
String people_1_role "BCO-DMO Data Manager";
String people_1_role_type "related";
String project "U.S. GEOTRACES PMT,PMT Be-7";
String projects_0_acronym "U.S. GEOTRACES PMT";
String projects_0_description
"A 60-day research cruise took place in 2018 along a transect form Alaska to Tahiti at 152° W. A description of the project titled \"Collaborative Research: Management and implementation of the US GEOTRACES Pacific Meridional Transect\", funded by NSF, is below. Further project information is available on the US GEOTRACES website and on the cruise blog. A detailed cruise report is also available as a PDF.
Description from NSF award abstract:
GEOTRACES is a global effort in the field of Chemical Oceanography in which the United States plays a major role. The goal of the GEOTRACES program is to understand the distributions of many elements and their isotopes in the ocean. Until quite recently, these elements could not be measured at a global scale. Understanding the distributions of these elements and isotopes will increase the understanding of processes that shape their distributions and also the processes that depend on these elements. For example, many \"trace elements\" (elements that are present in very low amounts) are also important for life, and their presence or absence can play a vital role in the population of marine ecosystems. This project will launch the next major U.S. GEOTRACES expedition in the Pacific Ocean between Alaska and Tahiti. The award made here would support all of the major infrastructure for this expedition, including the research vessel, the sampling equipment, and some of the core oceanographic measurements. This project will also support the personnel needed to lead the expedition and collect the samples.
This project would support the essential sampling operations and infrastructure for the U.S. GEOTRACES Pacific Meridional Transect along 152° W to support a large variety of individual science projects on trace element and isotope (TEI) biogeochemistry that will follow. Thus, the major objectives of this management proposal are: (1) plan and coordinate a 60 day research cruise in 2018; (2) obtain representative samples for a wide variety of TEIs using a conventional CTD/rosette, GEOTRACES Trace Element Sampling Systems, and in situ pumps; (3) acquire conventional CTD hydrographic data along with discrete samples for salinity, dissolved oxygen, algal pigments, 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 data to the GEOTRACES Data Assembly Centre (via the US BCO-DMO data center); and (6) coordinate all cruise communications between investigators, including preparation of a hydrographic report/publication. This project would also provide baseline measurements of TEIs in the Clarion-Clipperton fracture zone (~7.5°N-17°N, ~155°W-115°W) where large-scale deep sea mining is planned. Environmental impact assessments are underway in partnership with the mining industry, but the effect of mining activities on TEIs in the water column is one that could be uniquely assessed by the GEOTRACES community. In support of efforts to communicate the science to a wide audience the investigators will recruit an early career freelance science journalist with interests in marine science and oceanography to participate on the cruise and do public outreach, photography and/or videography, and social media from the ship, as well as to submit articles about the research to national media. The project would also support several graduate students.";
String projects_0_end_date "2020-07";
String projects_0_geolocation "Pacific Meridional Transect along 152W (GP15)";
String projects_0_name "US GEOTRACES Pacific Meridional Transect";
String projects_0_project_nid "695926";
String projects_0_project_website "http://www.usgeotraces.org/USGEOTRACES_website/html/pacific-alaska.html";
String projects_0_start_date "2017-08";
String projects_1_acronym "PMT Be-7";
String projects_1_description
"NSF Award Abstract:
The goal of the international GEOTRACES program is to understand the distributions of trace chemical elements and their isotopes in the oceans. One of the stated goals in the GEOTRACES Science Plan is to \"create a unique opportunity for exploration and discovery by determining the distributions of novel trace elements and isotopes (TEIs) that have received little attention to date.\" This is a proposal to make measurements of one such species, the radioactive isotope beryllium-7 which will provide important biogeochemical rate information pertinent to the TEIs that will be measured during the 2018 U.S. GEOTRACES Pacific Meridional transect from Tahiti to Alaska. Many processes in the ocean cannot be directly observed and as such, tracers are used to provide important constraints on their rates and pathways. Beryllium-7 is a tracer that, because of its half-life (53.3 days), allows the study of processes which occur over time scales and depth scales that are otherwise difficult to obtain but which are critically important to studies of biological production, nutrient regeneration, and atmospheric deposition, to name a few. Advances in sampling and analytical techniques, coupled with a better understanding of the behavior of Be-7 in ocean biogeochemical cycles, present an opportunity to fully utilize this tracer.
The proposed work has three main components:
1) Measurements of Be-7 in the surface waters and in the lower atmosphere along the cruise track will provide estimates of the atmospheric input of relevant TEIs. The atmospheric input into the global ocean is an important budgetary component of numerous chemical species, yet is very difficult to constrain. The data generated in this work will be available to allow ground-truthing of models of aerosol deposition and atmospheric input of trace elements.
2) Water column measurements of Be-7 provide a tracer of physical processes, such as mixing and upwelling, which redistribute biologically active species. Given quantitative knowledge of the circulation, mixing and ventilation of the water masses within which TEIs reside allows an assessment of the time- and space-integrated in situ biogeochemical behavior of these elements.
3) The rate of oxygen utilization within the upper thermocline will be determined by water column measurements of Be-7 coupled with collected hydrographic data and observed oxygen distributions. The seasonal timescale afforded by Be-7 is ideal for estimating OUR within the shallow water just beneath the euphotic zone, where the most significant C remineralization is occurring. The project will support undergraduate student researchers at Florida International University, a leading minority serving institution. Lead investigator Kadko will participate in the Nippon Foundation - Partnership for Observation of the Global Oceans Center of Excellence (NF-POGO CofE), a unique platform which aims to provide world class training programs for students from emerging countries. Kadko will be offering an advanced topic course in chemical oceanography to these students during a stay at the Alfred Wegener Institute of Polar Studies. This outreach effort is consistent with the capacity building and educational goals of GEOTRACES as well as promoting international collaboration.";
String projects_1_end_date "2020-08";
String projects_1_name "GEOTRACES Pacific Meridional Transect: Measurement of Beryllium-7 as a Tracer of Upper Ocean Processes";
String projects_1_project_nid "781790";
String projects_1_start_date "2017-09";
String publisher_name "Biological and Chemical Oceanographic Data Management Office (BCO-DMO)";
String publisher_type "institution";
String sourceUrl "(local files)";
Float64 Southernmost_Northing 22.0;
String standard_name_vocabulary "CF Standard Name Table v55";
String summary "Aerosol and seawater beryllium-7 concentrations from Leg 1 (Seattle, WA to Hilo, HI) of the US GEOTRACES Pacific Meridional Transect (PMT) cruise (GP15, RR1814) on R/V Roger Revelle from September to October 2018.";
String time_coverage_end "2018-10-19T22:15Z";
String time_coverage_start "2018-09-20T01:10Z";
String title "[GP15 Be-7 Leg 1] - Aerosol and seawater beryllium-7 concentrations from Leg 1 (Seattle, WA to Hilo, HI) of the US GEOTRACES Pacific Meridional Transect (PMT) cruise (GP15, RR1814) on R/V Roger Revelle from September to October 2018 (US GEOTRACES Pacific Meridional Transect)";
String version "1";
Float64 Westernmost_Easting -155.72;
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.