The Pacific Marine Environmental Laboratory's ERDDAP data server for public access to scientific data
NOAA OAR PMEL
|
Easy Access to PMEL Scientific Data
The Pacific Marine Environmental Laboratory's ERDDAP data server for public access to scientific data |
NOAA OAR PMEL |
| Dataset Title: | PMEL Atmospheric Chemistry ICEALOT Aerosol Chemistry data
|
| Institution: | NOAA (Dataset ID: ACG_ICEALOT_Knorr_chemistry) |
| Information: | Summary
| License
| FGDC
| ISO 19115
| Metadata
| Background
| Subset
| Files
| Make a graph
|
Attributes {
s {
time {
String _CoordinateAxisType "Time";
Float64 actual_range 1.205970045e+9, 1.2089541e+9;
String axis "T";
String comment "Start of sampling period";
String coords "time";
String ioos_category "Time";
String long_name "Datetime UTC";
String source_name "datetime_utc";
String standard_name "time";
String time_origin "01-JAN-1970 00:00:00";
String time_precision "1970-01-01T00:00:00Z";
String units "seconds since 1970-01-01T00:00:00Z";
}
trajectory_id {
String cf_role "trajectory_id";
String coords "time";
String ioos_category "Identifier";
String long_name "Trajectory ID";
}
duration {
Int32 _FillValue 2147483647;
Int32 actual_range 18660, 83940;
String coords "time";
String ioos_category "Time";
String long_name "Duration";
String units "second";
}
latitude {
String _CoordinateAxisType "Lat";
Float64 actual_range 40.98068, 80.20908;
String axis "Y";
Float64 colorBarMaximum 90.0;
Float64 colorBarMinimum -90.0;
String coords "time";
String instrument "GPS";
String ioos_category "Location";
String long_name "Latitude";
String source "surface observation";
String standard_name "latitude";
String units "degrees_north";
Float64 valid_max 90.0;
Float64 valid_min -90.0;
}
longitude {
String _CoordinateAxisType "Lon";
Float64 actual_range -73.4527, 31.45766;
String axis "X";
Float64 colorBarMaximum 180.0;
Float64 colorBarMinimum -180.0;
String coords "time";
String instrument "GPS";
String ioos_category "Location";
String long_name "Longitude";
String source "surface observation";
String standard_name "longitude";
String units "degrees_east";
Float64 valid_max 180.0;
Float64 valid_min -180.0;
}
altitude {
String _CoordinateAxisType "Height";
String _CoordinateZisPositive "up";
Float64 actual_range 18.0, 18.0;
String axis "Z";
Float64 colorBarMinimum 0.0;
String coords "time";
String ioos_category "Location";
String long_name "height above mean sea level";
String positive "up";
String standard_name "altitude";
String units "m";
Float64 valid_min 0.0;
}
mid_time {
String _CoordinateAxisType "Time";
Float64 actual_range 1.20599004e+9, 1.20896388e+9;
String axis "T";
String comment "Midpoint of sampling period";
String coords "time";
String ioos_category "Time";
String long_name "midpoint Datetime UTC";
String source_name "datetime_utc";
String standard_name "time";
String time_origin "01-JAN-1970 00:00:00";
String time_precision "1970-01-01T00:00:00Z";
String units "seconds since 1970-01-01T00:00:00Z";
}
end_time {
String _CoordinateAxisType "Time";
Float64 actual_range 1.206010035e+9, 1.20897366e+9;
String axis "T";
String comment "End of sampling period";
String coords "time";
String ioos_category "Time";
String long_name "endpoint Datetime UTC";
String source_name "datetime_utc";
String standard_name "time";
String time_origin "01-JAN-1970 00:00:00";
String time_precision "1970-01-01T00:00:00Z";
String units "seconds since 1970-01-01T00:00:00Z";
}
IC_MSA_sub1 {
Float64 _FillValue NaN;
Float64 actual_range 0.0, 0.095;
Float64 colorBarMaximum 60.0;
Float64 colorBarMinimum 0.0;
String coords "time";
String instrument "2-stage impactor";
String ioos_category "Unknown";
String long_name "Particulate MSA Concentration for Dp < 1.1 um, ug m-3";
String source "surface observation";
String units "micrograms m-3";
Float64 valid_max 50.0;
Float64 valid_min 0.0;
}
IC_MSA_super1 {
Float64 _FillValue NaN;
Float64 actual_range 0.0, 0.003;
Float64 colorBarMaximum 60.0;
Float64 colorBarMinimum 0.0;
String coords "time";
String instrument "2-stage impactor";
String ioos_category "Unknown";
String long_name "Particulate MSA Concentration for 1.1 um < Dp < 10 um, ug m-3";
String source "surface observation";
String units "micrograms m-3";
Float64 valid_max 50.0;
Float64 valid_min 0.0;
}
IC_Cl_sub1 {
Float64 _FillValue NaN;
Float64 actual_range 0.0, 1.038;
Float64 colorBarMaximum 60.0;
Float64 colorBarMinimum 0.0;
String coords "time";
String instrument "2-stage impactor -- ion chromatographic analysis";
String ioos_category "Unknown";
String long_name "Particulate Cl Concentration for Dp < 1.1 um, ug m-3";
String source "surface observation";
String units "micrograms m-3";
Float64 valid_max 50.0;
Float64 valid_min 0.0;
}
IC_Cl_super1 {
Float64 _FillValue NaN;
Float64 actual_range 0.0, 12.045;
Float64 colorBarMaximum 60.0;
Float64 colorBarMinimum 0.0;
String coords "time";
String instrument "2-stage impactor -- ion chromatographic analysis";
String ioos_category "Unknown";
String long_name "Particulate Cl Concentration for 1.1 um < Dp < 10 um, ug m-3";
String source "surface observation";
String units "micrograms m-3";
Float64 valid_max 50.0;
Float64 valid_min 0.0;
}
IC_Br_sub1 {
Float64 _FillValue NaN;
Float64 actual_range 0.0, 0.269;
String coords "time";
String ioos_category "Unknown";
String long_name "Particulate Br Concentration for Dp < 1.1 um, ug m-3";
String source "surface observation";
String units "micrograms m-3";
}
IC_Br_super1 {
Float64 _FillValue NaN;
Float64 actual_range 0.0, 0.838;
String coords "time";
String ioos_category "Unknown";
String long_name "Particulate Br Concentration for 1.1 um < Dp < 10 um, ug m-3";
String source "surface observation";
String units "micrograms m-3";
}
IC_NO3_sub1 {
Float64 _FillValue NaN;
Float64 actual_range 0.0, 0.192;
Float64 colorBarMaximum 60.0;
Float64 colorBarMinimum 0.0;
String coords "time";
String instrument "2-stage impactor -- ion chromatographic analysis";
String ioos_category "Dissolved Nutrients";
String long_name "Particulate NO3 Concentration for Dp < 1.1 um, ug m-3";
String source "surface observation";
String standard_name "mass_concentration_of_nitrate_dry_aerosol_particles_in_air";
String units "micrograms m-3";
Float64 valid_max 50.0;
Float64 valid_min 0.0;
}
IC_NO3_super1 {
Float64 _FillValue NaN;
Float64 actual_range 0.0, 1.538;
Float64 colorBarMaximum 60.0;
Float64 colorBarMinimum 0.0;
String coords "time";
String instrument "2-stage impactor -- ion chromatographic analysis";
String ioos_category "Dissolved Nutrients";
String long_name "Particulate NO3 Concentration for 1.1 um < Dp < 10 um, ug m-3";
String source "surface observation";
String standard_name "mass_concentration_of_nitrate_dry_aerosol_particles_in_air";
String units "micrograms m-3";
Float64 valid_max 50.0;
Float64 valid_min 0.0;
}
IC_SO4_sub1 {
Float64 _FillValue NaN;
Float64 actual_range 0.1, 1.805;
Float64 colorBarMaximum 60.0;
Float64 colorBarMinimum 0.0;
String coords "time";
String instrument "2-stage impactor -- ion chromatographic analysis";
String ioos_category "Optical Properties";
String long_name "Particulate SO4 Concentration for Dp < 1.1 um, ug m-3";
String source "surface observation";
String standard_name "mass_concentration_of_sulfate_dry_aerosol_particles_in_air";
String units "micrograms m-3";
Float64 valid_max 50.0;
Float64 valid_min 0.0;
}
IC_SO4_super1 {
Float64 _FillValue NaN;
Float64 actual_range 0.007, 1.337;
Float64 colorBarMaximum 60.0;
Float64 colorBarMinimum 0.0;
String coords "time";
String instrument "2-stage impactor -- ion chromatographic analysis";
String ioos_category "Optical Properties";
String long_name "Particulate SO4 Concentration for 1.1 um < Dp < 10 um, ug m-3";
String source "surface observation";
String standard_name "mass_concentration_of_sulfate_dry_aerosol_particles_in_air";
String units "micrograms m-3";
Float64 valid_max 50.0;
Float64 valid_min 0.0;
}
IC_Oxalate_sub1 {
Float64 _FillValue NaN;
Float64 actual_range 0.0, 0.026;
String coords "time";
String ioos_category "Unknown";
String long_name "Particulate Oxalate Concentration for Dp < 1.1 um, ug m-3";
String source "surface observation";
String units "micrograms m-3";
}
IC_Oxalate_super1 {
Float64 _FillValue NaN;
Float64 actual_range 0.0, 0.026;
String coords "time";
String ioos_category "Unknown";
String long_name "Particulate Oxalate Concentration for 1.1 um < Dp < 10 um, ug m-3";
String source "surface observation";
String units "micrograms m-3";
}
IC_Na_sub1 {
Float64 _FillValue NaN;
Float64 actual_range 0.0, 0.658;
Float64 colorBarMaximum 60.0;
Float64 colorBarMinimum 0.0;
String coords "time";
String instrument "2-stage impactor -- ion chromatographic analysis";
String ioos_category "Unknown";
String long_name "Particulate Na Concentration for Dp < 1.1 um, ug m-3";
String source "surface observation";
String units "micrograms m-3";
Float64 valid_max 50.0;
Float64 valid_min 0.0;
}
IC_Na_super1 {
Float64 _FillValue NaN;
Float64 actual_range 0.0, 6.451;
Float64 colorBarMaximum 60.0;
Float64 colorBarMinimum 0.0;
String coords "time";
String instrument "2-stage impactor -- ion chromatographic analysis";
String ioos_category "Unknown";
String long_name "Particulate Na Concentration for 1.1 um < Dp < 10 um, ug m-3";
String source "surface observation";
String units "micrograms m-3";
Float64 valid_max 50.0;
Float64 valid_min 0.0;
}
IC_NH4_sub1 {
Float64 _FillValue NaN;
Float64 actual_range 0.007, 0.56;
Float64 colorBarMaximum 60.0;
Float64 colorBarMinimum 0.0;
String coords "time";
String instrument "2-stage impactor -- ion chromatographic analysis";
String ioos_category "Dissolved Nutrients";
String long_name "Particulate NH4 Concentration for Dp < 1.1 um, ug m-3";
String source "surface observation";
String standard_name "mass_concentration_of_ammonium_dry_aerosol_particles_in_air";
String units "micrograms m-3";
Float64 valid_max 50.0;
Float64 valid_min 0.0;
}
IC_NH4_super1 {
Float64 _FillValue NaN;
Float64 actual_range 0.0, 0.015;
Float64 colorBarMaximum 60.0;
Float64 colorBarMinimum 0.0;
String coords "time";
String instrument "2-stage impactor -- ion chromatographic analysis";
String ioos_category "Dissolved Nutrients";
String long_name "Particulate NH4 Concentration for 1.1 um < Dp < 10 um, ug m-3";
String source "surface observation";
String standard_name "mass_concentration_of_ammonium_dry_aerosol_particles_in_air";
String units "micrograms m-3";
Float64 valid_max 50.0;
Float64 valid_min 0.0;
}
IC_K_sub1 {
Float64 _FillValue NaN;
Float64 actual_range 0.0, 0.1;
Float64 colorBarMaximum 60.0;
Float64 colorBarMinimum 0.0;
String coords "time";
String instrument "2-stage impactor -- ion chromatographic analysis";
String ioos_category "Unknown";
String long_name "Particulate K Concentration for Dp < 1.1 um, ug m-3";
String source "surface observation";
String units "micrograms m-3";
Float64 valid_max 50.0;
Float64 valid_min 0.0;
}
IC_K_super1 {
Float64 _FillValue NaN;
Float64 actual_range 0.0, 0.307;
Float64 colorBarMaximum 60.0;
Float64 colorBarMinimum 0.0;
String coords "time";
String instrument "2-stage impactor -- ion chromatographic analysis";
String ioos_category "Unknown";
String long_name "Particulate K Concentration for 1.1 um < Dp < 10 um, ug m-3";
String source "surface observation";
String units "micrograms m-3";
Float64 valid_max 50.0;
Float64 valid_min 0.0;
}
IC_Mg_sub1 {
Float64 _FillValue NaN;
Float64 actual_range 0.0, 0.06;
Float64 colorBarMaximum 60.0;
Float64 colorBarMinimum 0.0;
String coords "time";
String instrument "2-stage impactor -- ion chromatographic analysis";
String ioos_category "Unknown";
String long_name "Particulate Mg Concentration for Dp < 1.1 um, ug m-3";
String source "surface observation";
String units "micrograms m-3";
Float64 valid_max 50.0;
Float64 valid_min 0.0;
}
IC_Mg_super1 {
Float64 _FillValue NaN;
Float64 actual_range 0.0, 0.06;
Float64 colorBarMaximum 60.0;
Float64 colorBarMinimum 0.0;
String coords "time";
String instrument "2-stage impactor -- ion chromatographic analysis";
String ioos_category "Unknown";
String long_name "Particulate Mg Concentration for 1.1 um < Dp < 10 um, ug m-3";
String source "surface observation";
String units "micrograms m-3";
Float64 valid_max 50.0;
Float64 valid_min 0.0;
}
IC_Ca_sub1 {
Float64 _FillValue NaN;
Float64 actual_range 0.0, 0.091;
Float64 colorBarMaximum 60.0;
Float64 colorBarMinimum 0.0;
String coords "time";
String instrument "2-stage impactor -- ion chromatographic analysis";
String ioos_category "Unknown";
String long_name "Particulate Ca Concentration for Dp < 1.1 um, ug m-3";
String source "surface observation";
String units "micrograms m-3";
Float64 valid_max 50.0;
Float64 valid_min 0.0;
}
IC_Ca_super1 {
Float64 _FillValue NaN;
Float64 actual_range 0.0, 0.205;
Float64 colorBarMaximum 60.0;
Float64 colorBarMinimum 0.0;
String coords "time";
String instrument "2-stage impactor -- ion chromatographic analysis";
String ioos_category "Unknown";
String long_name "Particulate Ca Concentration for 1.1 um < Dp < 10 um, ug m-3";
String source "surface observation";
String units "micrograms m-3";
Float64 valid_max 50.0;
Float64 valid_min 0.0;
}
total_aerosol_mass_sub1 {
Float64 _FillValue NaN;
Float64 actual_range 0.0, 3.928;
String coords "time";
String instrument "2-stage impactor";
String ioos_category "Optical Properties";
String long_name "Particulate Fe Concentration for 1.1 um < Dp < 10 um, ug m-3";
String source "surface observation";
String units "micrograms m-3";
}
total_aerosol_mass_super1 {
Float64 _FillValue NaN;
Float64 actual_range 0.0, 20.957;
String coords "time";
String instrument "2-stage impactor";
String ioos_category "Optical Properties";
String long_name "Particulate Fe Concentration for 1.1 um < Dp < 10 um, ug m-3";
String source "surface observation";
String units "micrograms m-3";
}
}
NC_GLOBAL {
String cdm_data_type "Trajectory";
String cdm_trajectory_variables "trajectory_id";
String comment
"Aerosol Ion Chemistry Data
Two-stage multi-jet cascade impactors (Berner et al., 1979) sampling air at <25% RH were used to determine the sub- and supermicrometer concentrations of Cl-, Br-, NO3-, SO4=, methanesulfonate (MSA-), oxalate (Ox-), Na+, NH4+, K+, Mg+2, and Ca+2. Sampling periods ranged from 2 to 23 hours. The RH of the sampled air stream was measured a few inches upstream from the impactor. The 50% aerodynamic cutoff diameters, D50,aero, were 1.1 and 10 um. Submicrometer refers to particles with Daero < 1.1 um at <25% RH and supermicrometer refers to particles with 1.1 um < Daero < 10 um at <25% RH.
The impaction stage at the inlet of the impactor was coated with silicone grease to prevent the bounce of larger particles onto the downstream stages. Tedlar films were used as the collection substrate in the impaction stage and a Millipore Fluoropore filter (1.0-um pore size) was used for the backup filter. Films were cleaned in an ultrasonic bath in 10% H2O2 for 30 min, rinsed in distilled, deionized water, and dried in an NH3- and SO2-free glove box. Filters and films were wetted with 1 mL of spectral grade methanol. An additional 5 mLs of distilled deionized water were added to the solution and the substrates were extracted by sonicating for 30 min. The extracts were analyzed by ion chromatography [Quinn et al., 1998]. All handling of the substrates was done in the glove box. Blank levels were determined by loading an impactor with substrates but not drawing any air through it.
Non-sea salt sulfate concentrations were calculated from Na+ concentrations and the ratio of sulfate to sodium in seawater. Concentrations are reported as ug/m3 at STP (25C and 1 atm). Values below the detection limit are denoted with a 0, missing data are denoted with a NaN.
Berner et al., Sci. Total Environ., 13, 245 - 261, 1979.
Quinn et al., J. Geophys. Res., 105, 6785 - 6805, 2000.
Aerosol Trace Elements:
Contact persons: Tim Bates, tim.bates@noaa.gov; Trish Quinn, patricia.k.quinn@noaa.gov
Concentrations of Al, Si, Ca, Ti, and Fe were determined by thin-film x-ray primary and secondary emission spectrometry [Feely et al., 1991; Feely et al., 1998]. Submicrometer and sub-10 um samples were collected on Teflo filters (1.0 um pore size) mounted in Berner impactors having a D50,aero of 1.1 um and 10 um jet plates, respectively (Berner et al., 1979). Supermicrometer elemental concentrations were determined by difference between the submicrometer and sub-10 um concentrations. This method of sample collection allows for the sharp size cut of the impactor while collecting a thin film of aerosol necessary for the x-ray analysis. Sampling periods ranged from 2 to 23 hours. Blank levels were determined by loading an impactor or filter pack with a filter but not drawing any air through it. Concentrations are reported as ug/m3 at STP (25C and 1 atm). Values below the detection limit are denoted with a 0, missing data are denoted with a NaN.
Berner et al., Sci. Total Environ., 13, 245 - 261, 1979.
Feely et al., Geophys. Monogr. Ser., vol. 63, AGU, Washington, DC, 251 - 257, 1991.
Feely et al., Deep Sea Res., 45, 2637 - 2664, 1998.
NOAA PMEL Gravimetrically-determined Aerosol Mass - collected with 2 stage impactors
Two-stage multi-jet cascade impactors (Berner et al., 1979) sampling air at the indicated target sample RH were used to determine sub- and supermicron aerosol mass concentrations. The RH of the sampled air stream was measured a few inches upstream from the impactor. The 50% aerodynamic cutoff diameters, D50,aero, were 1.1 and 10 um. Submicron refers to particles with Daero < 1.1 um at 20% RH and supermicron refers to particles with 1.1 um < Daero < 10 um at 20% RH.
The impaction stage at the inlet of the impactor was coated with silicone grease to prevent the bounce of larger particles onto the downstream stages. Millipore Fluoropore films were used as the collection substrate in the impaction stage and a Millipore Fluoropore filter (1.0-um pore size) was used for the backup filter. Films were cleaned in an ultrasonic bath in 10% H2O2 for 30 min, rinsed in distilled, deionized water, and dried in an NH3- and SO2-free glove box.
Films and filters were weighed at PMEL with a Cahn Model 29 and Mettler UMT2 microbalance, respectively. The balances are housed in a glove box kept at a humidity of 65 ± 4%. The resulting mass concentrations from the gravimetric analysis include the water mass that is associated with the aerosol at <20% RH.
The glove box was continually purged with room air that had passed through a scrubber of activated charcoal, potassium carbonate, and citric acid to remove gas phase organics, acids, and ammonia. Static charging, which can result in balance instabilities, was minimized by coating the walls of the glove box with a static dissipative polymer (Tech Spray, Inc.), placing an anti-static mat on the glove box floor, using anti-static gloves while handling the substrates, and exposing the substrates to a 210Po source to dissipate any charge that had built up on the substrates. Before and after sample collection, substrates were stored double-bagged with the outer bag containing citric acid to prevent absorption of gas phase ammonia. More details of the weighing procedure can be found in Quinn and Coffman [1998].
Concentrations are reported as ug/m3 at STP (25C and 1 atm).
Berner et al., Sci. Total Environ., 13, 245 - 261, 1979.
Quinn et al., J. Geophys. Res., 105, 6785 - 6805, 2000.
Organic Carbon (Sunset Laboratory thermal/optical analyzer)
Sub-1.1 um and sub-10 um samples were collected on pre-combusted quartz fiber filters using 2 and 1 stage impactors, respectively, for organic carbon (OC) and elemental carbon (EC) analysis [Bates et al., 2004]. A charcoal diffusion denuder was deployed upstream of the submicrometer impactor to remove gas phase organic species. OC and EC concentrations were determined with a Sunset Laboratory thermal/optical analyzer. Three temperature steps were used to evolve OC under O2-free conditions for quantification. The first step heated the filter to 230 Deg C; the second step heated the filter to 600 Deg C (AMS vaporizer temperature); and the final step heated the filter to 870 Deg C. After cooling the sample down to 550 Deg C, a He/O2 mixture was introduced and the sample was heated in four temperature steps to 910 Deg C to drive off EC. The transmission of light through the filter was measured to correct the observed EC for any OC that charred during the initial stages of heating. No correction was made for carbonate carbon so OC includes both organic and carbonate carbon. The percentage of carbonate carbon is unknown. Super-micrometer OC concentrations were determined by difference between submicrometer and sub-10 um impactor samples without denuders.";
String contributor_name "Coffman, Derek/NOAA-PMEL/Address: 7600 Sand Pt. Wy. NE,Seattle,WA 98115 /email: derek.coffman@noaa.gov";
String Conventions "COARDS, CF-1.6, ACDD-1.3, NCCSV-1.0";
String creator_email "derek.coffman@noaa.gov";
String creator_name "Coffman, Derek";
String creator_url "https://www.pmel.noaa.gov/";
String dimensions "time=52";
Float64 Easternmost_Easting 31.45766;
String featureType "Trajectory";
Float64 geospatial_lat_max 80.20908;
Float64 geospatial_lat_min 40.98068;
String geospatial_lat_units "degrees_north";
Float64 geospatial_lon_max 31.45766;
Float64 geospatial_lon_min -73.4527;
String geospatial_lon_units "degrees_east";
Float64 geospatial_vertical_max 18.0;
Float64 geospatial_vertical_min 18.0;
String geospatial_vertical_positive "up";
String geospatial_vertical_units "m";
String history
"2025-05-10T00:31:32Z (local files)
2025-05-10T00:31:32Z https://data.pmel.noaa.gov/pmel/erddap/tabledap/ACG_ICEALOT_Knorr_chemistry.html";
String infoUrl "https://www.pmel.noaa.gov/acg/data/index.html";
String institution "NOAA";
String keywords "above, aerosol, air, altitude, ammonium, atmosphere, atmospheric, chemistry, concentration, data, datetime, dissolved, dissolved nutrients, dry, duration, earth, Earth Science > Atmosphere > Altitude > Station Height, end_time, endpoint, environmental, height, IC_Br_sub1, IC_Br_super1, IC_Ca_sub1, IC_Ca_super1, IC_Cl_sub1, IC_Cl_super1, IC_K_sub1, IC_K_super1, IC_Mg_sub1, IC_Mg_super1, IC_MSA_sub1, IC_MSA_super1, IC_Na_sub1, IC_Na_super1, IC_NH4_sub1, IC_NH4_super1, IC_NO3_sub1, IC_NO3_super1, IC_Oxalate_sub1, IC_Oxalate_super1, IC_SO4_sub1, IC_SO4_super1, icealot, identifier, laboratory, latitude, level, longitude, m-3, marine, mass, mass_concentration_of_ammonium_dry_aerosol_particles_in_air, mass_concentration_of_nitrate_dry_aerosol_particles_in_air, mass_concentration_of_sulfate_dry_aerosol_particles_in_air, mean, mid_time, midpoint, msa, n02, nh4, nitrate, no3, noaa, nutrients, optical, optical properties, oxalate, pacific, particles, particulate, pmel, properties, science, sea, so4, station, sulfate, time, total_aerosol_mass_sub1, total_aerosol_mass_super1, trajectory, trajectory_id";
String keywords_vocabulary "GCMD Science Keywords";
String license "These data were produced by NOAA and are not subject to copyright protection in the United States. NOAA waives any potential copyright and related rights in these data worldwide through the Creative Commons Zero 1.0 Universal Public Domain Dedication (CC0-1.0).";
Float64 Northernmost_Northing 80.20908;
String platform "Knorr";
String product_version "0";
String project "ICEALOT";
String sourceUrl "(local files)";
Float64 Southernmost_Northing 40.98068;
String standard_name_vocabulary "CF Standard Name Table v70";
String subsetVariables "trajectory_id, altitude";
String summary
"A NOAA Contribution for the International Polar Year 2008.
The International Chemistry Experiment in the Arctic Lower Troposphere (ICEALOT) was conducted in the North Atlantic and Arctic Oceans in March and April 2008 as part of the larger POLARCAT program. Pacific Marine Environmental Laboratory (PMEL) Atmospheric Chemistry Group made Aerosol chemical, physical, and optical measurements from March 19 to April 24 aboard the R/V Knorr during this project.";
String time_coverage_end "2008-04-23T12:35:00Z";
String time_coverage_start "2008-03-19T23:40:45Z";
String title "PMEL Atmospheric Chemistry ICEALOT Aerosol Chemistry data";
Float64 Westernmost_Easting -73.4527;
}
}
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.