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Dataset Title:	Biogeochemical time series at OBSEA moored buoy aggregated (30min averages)
Institution:	UPC - Universitat Politècnica de Catalunya (Dataset ID: OBSEA_moored_buoy_BGC_L3)
Range:	longitude = 1.75257 to 1.75257°E, latitude = 41.18212 to 41.18212°N, depth = 0.0 to 0.0m, time = 2022-08-02T10:00:00Z to 2024-07-29T16:00:00Z
Information:	Summary \| License \| FGDC \| ISO 19115 \| Metadata \| Background \| Subset \| Data Access Form \| Files

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The Dataset Attribute Structure (.das) for this Dataset

Attributes {
 s {
  time {
    UInt32 _ChunkSizes 13806;
    String _CoordinateAxisType "Time";
    Float64 actual_range 1.6594344e+9, 1.7222688e+9;
    String axis "T";
    String ioos_category "Time";
    String long_name "time of measurements";
    String monotonic "increasing";
    String sdn_parameter_name "Elapsed time relative to 1970-01-01T00:00:00Z";
    String sdn_parameter_uri "https://vocab.nerc.ac.uk/collection/P01/current/ELTMEP01/";
    String sdn_parameter_urn "SDN:P01::ELTMEP01";
    String sdn_uom_name "Seconds";
    String sdn_uom_uri "https://vocab.nerc.ac.uk/collection/P06/current/UTBB/";
    String sdn_uom_urn "SDN:P06::UTBB";
    String standard_name "time";
    String time_origin "01-JAN-1970 00:00:00";
    String units "seconds since 1970-01-01T00:00:00Z";
    String variable_type "coordinate";
  }
  depth {
    UInt32 _ChunkSizes 13806;
    String _CoordinateAxisType "Height";
    String _CoordinateZisPositive "down";
    Float64 _FillValue -2.147483648e+9;
    Float64 actual_range 0.0, 0.0;
    String axis "Z";
    String ioos_category "Location";
    String long_name "depth of measurements";
    String positive "down";
    String sdn_parameter_name "Depth (spatial coordinate) relative to water surface in the water body";
    String sdn_parameter_uri "https://vocab.nerc.ac.uk/collection/P01/current/ADEPZZ01";
    String sdn_parameter_urn "SDN:P01::ADEPZZ01";
    String sdn_uom_name "Metres";
    String sdn_uom_uri "https://vocab.nerc.ac.uk/collection/P06/current/ULAA/";
    String sdn_uom_urn "SDN:P06::ULAA";
    String standard_name "depth";
    String units "m";
    String variable_type "coordinate";
  }
  latitude {
    UInt32 _ChunkSizes 13806;
    String _CoordinateAxisType "Lat";
    Float64 _FillValue -9999.99;
    Float64 actual_range 41.18212, 41.18212;
    String axis "Y";
    String ioos_category "Location";
    String long_name "latitude of measurements";
    String sdn_parameter_name "Latitude north";
    String sdn_parameter_uri "https://vocab.nerc.ac.uk/collection/P01/current/ALATZZ01";
    String sdn_parameter_urn "SDN:P01::ALATZZ01";
    String sdn_uom_name "Degrees";
    String sdn_uom_uri "https://vocab.nerc.ac.uk/collection/P06/current/UAAA/";
    String sdn_uom_urn "SDN:P06::UAAA";
    String standard_name "latitude";
    String units "degrees_north";
    String variable_type "coordinate";
  }
  longitude {
    UInt32 _ChunkSizes 13806;
    String _CoordinateAxisType "Lon";
    Float64 _FillValue -9999.99;
    Float64 actual_range 1.75257, 1.75257;
    String axis "X";
    String ioos_category "Location";
    String long_name "longitude of measurements";
    String sdn_parameter_name "Longitude east";
    String sdn_parameter_uri "https://vocab.nerc.ac.uk/collection/P01/current/ALONZZ01";
    String sdn_parameter_urn "SDN:P01::ALONZZ01";
    String sdn_uom_name "Degrees";
    String sdn_uom_uri "https://vocab.nerc.ac.uk/collection/P06/current/UAAA/";
    String sdn_uom_urn "SDN:P06::UAAA";
    String standard_name "longitude";
    String units "degrees_east";
    String variable_type "coordinate";
  }
  sensor_id {
    String long_name "Identifier of the sensor that took the measurement";
    String sdn_parameter_name "Name of sampling instrument";
    String sdn_parameter_uri "https://vocab.nerc.ac.uk/collection/P01/current/NMSPINST/";
    String sdn_parameter_urn "SDN:P01::NMSPINST";
    String variable_type "coordinate";
  }
  platform_id {
    String cf_role "timeseries_id";
    String long_name "Platform where the sensor was deployed";
    String sdn_parameter_name "Name of sampling platform";
    String sdn_parameter_uri "https://vocab.nerc.ac.uk/collection/P01/current/NMSPPF01/";
    String sdn_parameter_urn "SDN:P01::NMSPPF01";
    String standard_name "platform_id";
    String variable_type "coordinate";
  }
  ALKY {
    UInt32 _ChunkSizes 13806;
    Float64 _FillValue -9999.99;
    Float64 actual_range 3.583, 9.416;
    String ancillary_variables "ALKY_QC";
    String coordinates "time latitude longitude depth sensor_id platform_id";
    String long_name "Minus the log of the hydrogen ion concentration (moles per litre) in the water column.";
    String sdn_parameter_name "pH (unspecified scale) of the water body";
    String sdn_parameter_uri "https://vocab.nerc.ac.uk/collection/P01/current/PHXXZZXX";
    String sdn_parameter_urn "SDN:P01::PHXXZZXX";
    String sdn_uom_name "pH units";
    String sdn_uom_uri "https://vocab.nerc.ac.uk/collection/P06/current/UUPH/";
    String sdn_uom_urn "SDN:P06::UUPH";
    String standard_name "sea_water_ph_reported_on_total_scale";
    String units "pH units";
    String variable_type "environmental";
  }
  CDOM {
    UInt32 _ChunkSizes 13806;
    Float64 _FillValue -9999.99;
    Float64 actual_range 0.0, 750.9;
    String ancillary_variables "CDOM_QC";
    String coordinates "time latitude longitude depth sensor_id platform_id";
    String long_name "The quantity of coloured organic compounds in solution in unit volume of any body of water";
    String sdn_parameter_name "Concentration of coloured dissolved organic matter {CDOM Gelbstoff} per unit volume of the water body [dissolved plus reactive particulate phase] by fluorometry";
    String sdn_parameter_uri "https://vocab.nerc.ac.uk/collection/P01/current/CDOMZZ01/";
    String sdn_parameter_urn "SDN:P01::CDOMZZ01";
    String sdn_uom_name "Parts per billion";
    String sdn_uom_uri "https://vocab.nerc.ac.uk/collection/P06/current/UPPB/";
    String sdn_uom_urn "SDN:P06::UPPB";
    String standard_name "concentration_of_colored_dissolved_organic_matter_in_sea_water_expressed_as_equivalent_mass_fraction_of_quinine_sulfate_dihydrate";
    String units "ppb";
    String variable_type "environmental";
  }
  CNDC {
    UInt32 _ChunkSizes 13806;
    Float64 _FillValue -9999.99;
    Float64 actual_range 1.024, 3.543;
    String ancillary_variables "CNDC_QC";
    String coordinates "time latitude longitude depth sensor_id platform_id";
    String long_name "sea water electrical conductivity";
    String sdn_parameter_name "Electrical conductivity of the water body by CTD";
    String sdn_parameter_uri "https://vocab.nerc.ac.uk/collection/P01/current/CNDCST01/";
    String sdn_parameter_urn "SDN:P01::CNDCST01";
    String sdn_uom_name "Siemens per metre";
    String sdn_uom_uri "https://vocab.nerc.ac.uk/collection/P06/current/UECA/";
    String sdn_uom_urn "SDN:P06::UECA";
    String standard_name "sea_water_electrical_conductivity";
    String units "S/m";
    String variable_type "environmental";
  }
  COIL {
    UInt32 _ChunkSizes 13806;
    Float64 _FillValue -9999.99;
    Float64 actual_range 5.4, 989.4;
    String ancillary_variables "COIL_QC";
    String coordinates "time latitude longitude depth sensor_id platform_id";
    String long_name "crude oil in sea water";
    String sdn_parameter_uri "crude_oil";
    String sdn_uom_name "Parts per billion";
    String sdn_uom_uri "https://vocab.nerc.ac.uk/collection/P06/current/UPPB/";
    String sdn_uom_urn "SDN:P06::UPPB";
    String standard_name "crude_oil";
    String units "ppb";
    String variable_type "environmental";
  }
  DOXY {
    UInt32 _ChunkSizes 13806;
    Float64 _FillValue -9999.99;
    Float64 actual_range 14.29, 133.82;
    String ancillary_variables "DOXY_QC";
    String coordinates "time latitude longitude depth sensor_id platform_id";
    String long_name "saturation of oxygen in sea water";
    String sdn_parameter_name "Saturation of oxygen {O2 CAS 7782-44-7} in the water body [dissolved plus reactive particulate phase] by in-situ oxygen optode and computation from concentration";
    String sdn_parameter_uri "https://vocab.nerc.ac.uk/collection/P01/current/OXYSOP01/";
    String sdn_parameter_urn "SDN:P01::OXYSOP01";
    String sdn_uom_name "Percent";
    String sdn_uom_uri "https://vocab.nerc.ac.uk/collection/P06/current/UPCT/";
    String sdn_uom_urn "SDN:P06::UPCT";
    String standard_name "fractional_saturation_of_oxygen_in_sea_water";
    String units "%";
    String variable_type "environmental";
  }
  RFUL {
    UInt32 _ChunkSizes 13806;
    Float64 _FillValue -9999.99;
    Float64 actual_range 0.16, 199.4;
    String ancillary_variables "RFUL_QC";
    String coordinates "time latitude longitude depth sensor_id platform_id";
    String long_name "refined fuels in sea water";
    String sdn_parameter_uri "refined_fuels";
    String sdn_uom_name "Parts per million";
    String sdn_uom_uri "https://vocab.nerc.ac.uk/collection/P06/current/UPPM";
    String sdn_uom_urn "SDN:P06::UPPM";
    String standard_name "refined_fuels";
    String units "ppm";
    String variable_type "environmental";
  }
  TEMP {
    UInt32 _ChunkSizes 13806;
    Float64 _FillValue -9999.99;
    Float64 actual_range 12.2, 30.11;
    String ancillary_variables "TEMP_QC";
    String coordinates "time latitude longitude depth sensor_id platform_id";
    String long_name "in situ sea water temperature";
    String sdn_parameter_name "Temperature of the water body by CTD or STD";
    String sdn_parameter_uri "https://vocab.nerc.ac.uk/collection/P01/current/TEMPST01";
    String sdn_parameter_urn "SDN:P01::TEMPST01";
    String sdn_uom_name "Degrees Celsius";
    String sdn_uom_uri "https://vocab.nerc.ac.uk/collection/P06/current/UPAA/";
    String sdn_uom_urn "SDN:P06::UPAA";
    String standard_name "sea_water_temperature";
    String units "degC";
    String variable_type "environmental";
  }
  TURB {
    UInt32 _ChunkSizes 13806;
    Float64 _FillValue -9999.99;
    Float64 actual_range 0.0, 3791.8;
    String ancillary_variables "TURB_QC";
    String coordinates "time latitude longitude depth sensor_id platform_id";
    String long_name "Turbidity of water in the water body";
    String sdn_parameter_name "Turbidity of water in the water body";
    String sdn_parameter_uri "https://vocab.nerc.ac.uk/collection/P01/current/TURBXXXX/";
    String sdn_parameter_urn "SDN:P01::TURBXXXX";
    String sdn_uom_name "Nephelometric Turbidity Units";
    String sdn_uom_uri "https://vocab.nerc.ac.uk/collection/P06/current/USTU/";
    String sdn_uom_urn "SDN:P06::USTU";
    String standard_name "sea_water_turbidity";
    String units "NTU";
    String variable_type "environmental";
  }
  WBRX {
    UInt32 _ChunkSizes 13806;
    Float64 _FillValue -9999.99;
    Float64 actual_range 3.0, 691.4;
    String ancillary_variables "WBRX_QC";
    String coordinates "time latitude longitude depth sensor_id platform_id";
    String long_name "A measure of the tendency of any body of fresh or salt water to either gain or lose electrons when it is subject to change by introduction of a new species";
    String sdn_parameter_name "pH (unspecified scale) of the water body by pH electrode";
    String sdn_parameter_uri "https://vocab.nerc.ac.uk/collection/P01/current/PHXXPR01/";
    String sdn_parameter_urn "SDN:P01::PHXXPR01";
    String sdn_uom_name "Millivolts";
    String sdn_uom_uri "https://vocab.nerc.ac.uk/collection/P06/current/UUMV/";
    String sdn_uom_urn "SDN:P06::UUMV";
    String standard_name "sea_water_oxidation_reduction_potential";
    String units "mV";
    String variable_type "environmental";
  }
  ALKY_QC {
    UInt32 _ChunkSizes 13806;
    Byte _FillValue -1;
    String _Unsigned "true";
    Byte actual_range 1, 9;
    String conventions "OceanSITES QC Flags";
    String flag_meanings "unknown good_data probably_good_data potentially_correctable_bad_data bad_data nominal_value interpolated_value missing_value";
    Byte flag_values 0, 1, 2, 3, 4, 7, 8, 9;
    String long_name "Minus the log of the hydrogen ion concentration (moles per litre) in the water column. quality control flags";
    String variable_type "quality_control";
  }
  CDOM_QC {
    UInt32 _ChunkSizes 13806;
    Byte _FillValue -1;
    String _Unsigned "true";
    Byte actual_range 1, 9;
    String conventions "OceanSITES QC Flags";
    String flag_meanings "unknown good_data probably_good_data potentially_correctable_bad_data bad_data nominal_value interpolated_value missing_value";
    Byte flag_values 0, 1, 2, 3, 4, 7, 8, 9;
    String long_name "The quantity of coloured organic compounds in solution in unit volume of any body of water quality control flags";
    String variable_type "quality_control";
  }
  CNDC_QC {
    UInt32 _ChunkSizes 13806;
    Byte _FillValue -1;
    String _Unsigned "true";
    Byte actual_range 1, 9;
    String conventions "OceanSITES QC Flags";
    String flag_meanings "unknown good_data probably_good_data potentially_correctable_bad_data bad_data nominal_value interpolated_value missing_value";
    Byte flag_values 0, 1, 2, 3, 4, 7, 8, 9;
    String long_name "sea water electrical conductivity quality control flags";
    String variable_type "quality_control";
  }
  COIL_QC {
    UInt32 _ChunkSizes 13806;
    Byte _FillValue -1;
    String _Unsigned "true";
    Byte actual_range 1, 9;
    String conventions "OceanSITES QC Flags";
    String flag_meanings "unknown good_data probably_good_data potentially_correctable_bad_data bad_data nominal_value interpolated_value missing_value";
    Byte flag_values 0, 1, 2, 3, 4, 7, 8, 9;
    String long_name "crude oil in sea water quality control flags";
    String variable_type "quality_control";
  }
  DOXY_QC {
    UInt32 _ChunkSizes 13806;
    Byte _FillValue -1;
    String _Unsigned "true";
    Byte actual_range 1, 9;
    String conventions "OceanSITES QC Flags";
    String flag_meanings "unknown good_data probably_good_data potentially_correctable_bad_data bad_data nominal_value interpolated_value missing_value";
    Byte flag_values 0, 1, 2, 3, 4, 7, 8, 9;
    String long_name "saturation of oxygen in sea water quality control flags";
    String variable_type "quality_control";
  }
  RFUL_QC {
    UInt32 _ChunkSizes 13806;
    Byte _FillValue -1;
    String _Unsigned "true";
    Byte actual_range 1, 9;
    String conventions "OceanSITES QC Flags";
    String flag_meanings "unknown good_data probably_good_data potentially_correctable_bad_data bad_data nominal_value interpolated_value missing_value";
    Byte flag_values 0, 1, 2, 3, 4, 7, 8, 9;
    String long_name "refined fuels in sea water quality control flags";
    String variable_type "quality_control";
  }
  TEMP_QC {
    UInt32 _ChunkSizes 13806;
    Byte _FillValue -1;
    String _Unsigned "true";
    Byte actual_range 1, 3;
    String conventions "OceanSITES QC Flags";
    String flag_meanings "unknown good_data probably_good_data potentially_correctable_bad_data bad_data nominal_value interpolated_value missing_value";
    Byte flag_values 0, 1, 2, 3, 4, 7, 8, 9;
    String long_name "in situ sea water temperature quality control flags";
    String variable_type "quality_control";
  }
  TURB_QC {
    UInt32 _ChunkSizes 13806;
    Byte _FillValue -1;
    String _Unsigned "true";
    Byte actual_range 1, 9;
    String conventions "OceanSITES QC Flags";
    String flag_meanings "unknown good_data probably_good_data potentially_correctable_bad_data bad_data nominal_value interpolated_value missing_value";
    Byte flag_values 0, 1, 2, 3, 4, 7, 8, 9;
    String long_name "Turbidity of water in the water body quality control flags";
    String variable_type "quality_control";
  }
  WBRX_QC {
    UInt32 _ChunkSizes 13806;
    Byte _FillValue -1;
    String _Unsigned "true";
    Byte actual_range 1, 9;
    String conventions "OceanSITES QC Flags";
    String flag_meanings "unknown good_data probably_good_data potentially_correctable_bad_data bad_data nominal_value interpolated_value missing_value";
    Byte flag_values 0, 1, 2, 3, 4, 7, 8, 9;
    String long_name "A measure of the tendency of any body of fresh or salt water to either gain or lose electrons when it is subject to change by introduction of a new species quality control flags";
    String variable_type "quality_control";
  }
  C3_SN2300642 {
    String long_name "Turner designs C3 submersible fluorometer";
    String sdn_instrument_name "Turner Designs C3 submersible fluorometer";
    String sdn_instrument_uri "https://vocab.nerc.ac.uk/collection/L22/current/TOOL1907/";
    String sdn_instrument_urn "SDN:L22::TOOL1907";
    String sensor_id "C3_SN2300642";
    String sensor_manufacturer_uri "https://vocab.nerc.ac.uk  /collection/B75/current/ORG00400/";
    String sensor_mount "mounted_on_seafloor_structure";
    String sensor_orientation "upward";
    String sensor_SeaVoX_L22_code "SDN:L22::TOOL1907";
    String sensor_serial_number "2300642";
    String sensor_type_name "fluorometers";
    String sensor_type_uri "https://vocab.nerc.ac.uk/collection/L05/current/113";
    String sensor_type_urn "SDN:L05::113";
    String variable_type "sensor";
  }
  SA8065_SN0000 {
    String long_name "B&C Electronics SA8065.101 multiparameter probe";
    String sdn_instrument_name "inapplicable";
    String sdn_instrument_uri "https://vocab.nerc.ac.uk/collection/L22/current/TOOL000X/";
    String sdn_instrument_urn "SDN:L22::TOOL000X";
    String sensor_id "SA8065_SN0000";
    String sensor_manufacturer_name "unspecified";
    String sensor_manufacturer_uri "https://vocab.nerc.ac.uk/collection/L35/current/MAN0001/";
    String sensor_manufacturer_urn "SDN:L35::MAN0001";
    String sensor_mount "mounted_on_seafloor_structure";
    String sensor_orientation "upward";
    String sensor_SeaVoX_L22_code "SDN:L22::TOOL000X";
    String sensor_serial_number "0000";
    String variable_type "sensor";
  }
  OBSEA_Besos_Buoy {
    Float64 depth 0.0;
    String emso_platform_name "OBSEA moored buoy";
    Float64 latitude 41.18212;
    String long_name "OBSEA Buoy on top of the seafloor observatory";
    Float64 longitude 1.75257;
    String platform_id "OBSEA_Besos_Buoy";
    String platform_reference "https://vocab.nerc.ac.uk/collection/L06/current/41/";
    String platform_type_name "moored surface buoy";
    String platform_type_uri "https://vocab.nerc.ac.uk/collection/L06/current/41/";
    String platform_type_urn "SDN:L06::41";
    String variable_type "platform";
    String wmo_platform_code "6103565";
  }
  OBSEA_Buoy {
    Float64 depth 0.0;
    String emso_platform_name "OBSEA moored buoy";
    Float64 latitude 41.18212;
    String long_name "OBSEA Buoy on top of the seafloor observatory";
    Float64 longitude 1.75257;
    String platform_id "OBSEA_Buoy";
    String platform_reference "https://vocab.nerc.ac.uk/collection/L06/current/41/";
    String platform_type_name "moored surface buoy";
    String platform_type_uri "https://vocab.nerc.ac.uk/collection/L06/current/41/";
    String platform_type_urn "SDN:L06::41";
    String variable_type "platform";
    String wmo_platform_code "6103565";
  }
 }
  NC_GLOBAL {
    String cdm_data_type "TimeSeries";
    String cdm_timeseries_variables "platform_id,sensor_id,latitude,longitude,depth";
    String contributor_types "ProjectLeader DataCurator DataCollector DataCollector";
    String contributors "Joaquin del Rio Enoc Martinez Marc Nogueras Daniel M. Toma";
    String Conventions "OceanSITES EMSO CF-1.8";
    String data_mode "D";
    String data_type "OceanSITES profile data";
    String date_created "2026-03-09";
    Float64 Easternmost_Easting 1.75257;
    String emso_regional_facility_name "Balearic Sea";
    String emso_regional_facility_uri "https://w3id.org/earthsemantics/OSO#Balearic_Sea";
    String emso_site_name "OBSEA";
    String emso_site_uri "https://w3id.org/earthsemantics/OSO#OBSEA";
    String featureType "TimeSeries";
    String format_version "1.4";
    Float64 geospatial_lat_max 41.18212;
    Float64 geospatial_lat_min 41.18212;
    String geospatial_lat_units "degrees_north";
    Float64 geospatial_lon_max 1.75257;
    Float64 geospatial_lon_min 1.75257;
    String geospatial_lon_units "degrees_east";
    Float64 geospatial_vertical_max 0.0;
    Float64 geospatial_vertical_min 0.0;
    String geospatial_vertical_positive "down";
    String geospatial_vertical_units "m";
    String history 
"2026-03-09T15:08:24Z (local files)
2026-03-09T15:08:24Z https://data.obsea.es/tabledap/OBSEA_moored_buoy_BGC_L3.das";
    String infoUrl "https://edmo.seadatanet.org/report/2150";
    String institution "UPC - Universitat Politècnica de Catalunya";
    String institution_edmo_code "2150";
    String institution_edmo_uri "https://edmo.seadatanet.org/report/2150";
    String institution_ror_uri "https://ror.org/03mb6wj31";
    String license "CC-BY-4.0";
    String license_uri "https://spdx.org/licenses/CC-BY-4.0";
    String network "EMSO";
    Float64 Northernmost_Northing 41.18212;
    String principal_investigator "Joaquin del Rio";
    String principal_investigator_email "joaquin.del.rio@upc.edu";
    String source "moored surface buoy";
    String sourceUrl "(local files)";
    Float64 Southernmost_Northing 41.18212;
    String standard_name_vocabulary "CF Standard Name Table v70";
    String subsetVariables "platform_id,sensor_id,depth,ALKY_QC,CDOM_QC,CNDC_QC,COIL_QC,DOXY_QC,RFUL_QC,TEMP_QC,TURB_QC,WBRX_QC";
    String summary "Biogeochemical time series at OBSEA moored buoy aggregated (30min averages)";
    String time_coverage_end "2024-07-29T16:00:00Z";
    String time_coverage_start "2022-08-02T10:00:00Z";
    String title "Biogeochemical time series at OBSEA moored buoy aggregated (30min averages)";
    String update_interval "void";
    Float64 Westernmost_Easting 1.75257;
  }
}

Using tabledap to Request Data and Graphs from Tabular Datasets

tabledap lets you request a data subset, a graph, or a map from a tabular dataset (for example, buoy data), via a specially formed URL. tabledap uses the OPeNDAP (external link)

Data Access Protocol (DAP) (external link)

and its selection constraints (external link)

The URL specifies what you want: the dataset, a description of the graph or the subset of the data, and the file type for the response.

(easy) You can get data by using the dataset's Data Access Form or Subset form. They make the URL for you.
(easy) You can make a graph or map by using the dataset's Make A Graph form. It makes the URL for you.
(not hard) You can bypass the forms and get the data or make a graph or map by generating the URL by hand or with a computer program or script.

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.