NOAA PMEL Easy Access to PMEL Scientific Data
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Dataset Title:  PMEL Atmospheric Chemistry CSP Aerosol Chemistry data Subscribe RSS
Institution:  NOAA   (Dataset ID: ACG_CSP_Discoverer_chemistry)
Information:  Summary ? | License ? | FGDC | ISO 19115 | Metadata | Background (external link) | Subset | Files | Make a graph
 
Variable ?   Optional
Constraint #1 ? 		Optional
Constraint #2 ? 		   Minimum ?
   or a List of Values ? 		   Maximum ?
 
 time (Datetime UTC, UTC) ?          1996-03-16T01:06:00Z    1996-04-10T23:36:00Z
  < slider >
 trajectory_id ?      
   - +  ?
 duration (second) ?          12060    94740
 latitude (degrees_north) ?          -8.705    13.5665
  < slider >
 longitude (degrees_east) ?          147.481    193.798
  < slider >
 altitude (height above mean sea level, m) ?      
   - +  ?
  < slider >
 mid_time (midpoint Datetime UTC, UTC) ?          1996-03-16T12:27:30Z    1996-04-11T11:15:30Z
 end_time (endpoint Datetime UTC, UTC) ?          1996-03-16T23:49:00Z    1996-04-11T22:55:00Z
 IC_Cl_sub1 (micrograms m-3) ?          0.15    3.2
 IC_Cl_super1 (micrograms m-3) ?          0.5    11.2
 IC_Br_sub1 (micrograms m-3) ?          0.0    0.079
 IC_Br_super1 (micrograms m-3) ?          0.0    0.016
 IC_NO3_sub1 (micrograms m-3) ?          0.0    0.42
 IC_NO3_super1 (micrograms m-3) ?          0.018    0.47
 IC_SO4_sub1 (micrograms m-3) ?          0.26    5.7
 IC_SO4_super1 (micrograms m-3) ?          0.085    1.34
 IC_Na_sub1 (micrograms m-3) ?          0.1    1.9
 IC_Na_super1 (micrograms m-3) ?          0.15    4.8
 IC_NH4_sub1 (micrograms m-3) ?          0.019    1.1
 IC_NH4_super1 (micrograms m-3) ?          0.0    0.077
 IC_K_sub1 (micrograms m-3) ?          0.0    0.14
 IC_K_super1 (micrograms m-3) ?          0.0047    0.19
 IC_Mg_sub1 (micrograms m-3) ?          0.018    0.26
 IC_Mg_super1 (micrograms m-3) ?          0.016    0.62
 IC_Ca_sub1 (micrograms m-3) ?          0.0    0.61
 IC_Ca_super1 (micrograms m-3) ?          0.0    0.18
 
Server-side Functions ?
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The Dataset Attribute Structure (.das) for this Dataset

Attributes {
 s {
  time {
    String _CoordinateAxisType "Time";
    Float64 actual_range 8.2693836e+8, 8.2917936e+8;
    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 12060, 94740;
    String coords "time";
    String ioos_category "Time";
    String long_name "Duration";
    String units "second";
  }
  latitude {
    String _CoordinateAxisType "Lat";
    Float64 actual_range -8.705, 13.5665;
    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 147.481, 193.798;
    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 8.2697925e+8, 8.2922133e+8;
    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 8.2702014e+8, 8.292633e+8;
    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_Cl_sub1 {
    Float64 actual_range 0.15, 3.2;
    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 actual_range 0.5, 11.2;
    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 actual_range 0.0, 0.079;
    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 actual_range 0.0, 0.016;
    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 actual_range 0.0, 0.42;
    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 actual_range 0.018, 0.47;
    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 actual_range 0.26, 5.7;
    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 actual_range 0.085, 1.34;
    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_Na_sub1 {
    Float64 actual_range 0.1, 1.9;
    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 actual_range 0.15, 4.8;
    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 actual_range 0.019, 1.1;
    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 actual_range 0.0, 0.077;
    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 actual_range 0.0, 0.14;
    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 actual_range 0.0047, 0.19;
    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 actual_range 0.018, 0.26;
    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 actual_range 0.016, 0.62;
    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 actual_range 0.0, 0.61;
    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 actual_range 0.0, 0.18;
    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;
  }
 }
  NC_GLOBAL {
    String cdm_data_type "Trajectory";
    String cdm_trajectory_variables "trajectory_id";
    String comment 
"Ion Chemistry (Ion Chromatograph)

Two and seven-stage multi-jet cascade impactors (Berner et al., 1979) sampling air at 55-60% RH were used to determine the mass size distribution of Cl-, Br-, NO3-, SO4=, Na+, NH4+, K+, Mg+2, and Ca+2. Sampling periods ranged from 12 to 24 hours. In the data record zero indicates “below detection limit”.

Ion concentrations are given in ng/m3. For the two stage impactor samples, Submicron values represent the ion concentration in all particles with aerodynamic diameters < 1.0 um. Supermicron values are for particles with aerodynamic diameters > 1um and < 10 um.

For the seven stage impactor the size cuts are as follows:

Stage 1: D50,aero = 0.182, dlogDp = 0.358
Stage 2: D50,aero = 0.305, dlogDp = 0.223
Stage 3: D50,aero = 0.57, dlogDp = 0.272
Stage 4: D50,aero = 1.1, dlogDp = 0.286
Stage 5: D50,aero = 2.15, dlogDp = 0.291
Stage 6: D50,aero = 4.05, dlogDp = 0.275
Stage 7: D50,aero = 10, dlogDp = 0.393

(These diameters are given for a flow rate of 30 lpm and are subject to change after calibration of the collection efficiency of the impactor jet plate. This calibration is planned for the Fall of 1996).";
    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=58";
    Float64 Easternmost_Easting 193.798;
    String featureType "Trajectory";
    Float64 geospatial_lat_max 13.5665;
    Float64 geospatial_lat_min -8.705;
    String geospatial_lat_units "degrees_north";
    Float64 geospatial_lon_max 193.798;
    Float64 geospatial_lon_min 147.481;
    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 
"2025-12-07T18:37:27Z (local files)
2025-12-07T18:37:27Z https://data.pmel.noaa.gov/pmel/erddap/tabledap/ACG_CSP_Discoverer_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, csp, data, datetime, department, dissolved, dissolved nutrients, doe, dry, duration, earth, Earth Science > Atmosphere > Altitude > Station Height, end_time, endpoint, energy, 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_Na_sub1, IC_Na_super1, IC_NH4_sub1, IC_NH4_super1, IC_NO3_sub1, IC_NO3_super1, IC_SO4_sub1, IC_SO4_super1, 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, n02, nh4, nitrate, no3, noaa, nutrients, optical, optical properties, pacific, particles, particulate, pmel, properties, remote, remss, science, sea, sensing, so4, station, sulfate, systems, time, 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 13.5665;
    String platform "Discoverer";
    String product_version "0";
    String project "CSP";
    String sourceUrl "(local files)";
    Float64 Southernmost_Northing -8.705;
    String standard_name_vocabulary "CF Standard Name Table v70";
    String subsetVariables "trajectory_id, altitude";
    String summary "The Combined Sensor Program, CSP,  brought together for the first time in a maritime environment a suite of in-situ and remote sensing systems to characterize both air-sea interaction and the radiative balance of the tropical atmosphere, including aerosols and clouds. The cruise departed Pago Pago, American Samoa on 14 March 1996, headed northwest to 2S, and then turned west to Manus Island, Papua New Guinea. The ship was positioned for 10 days within 100 km of Manus Island to acquire data in coordination with the Department of Energy (DOE) Atmospheric Radiation Measurement, ARM,  Cloud and Radiation Testbed, CART, site on the island. The ship then headed east to 180W and then northeast to Hawaii, arriving on 13 April 1996.";
    String time_coverage_end "1996-04-10T23:36:00Z";
    String time_coverage_start "1996-03-16T01:06:00Z";
    String title "PMEL Atmospheric Chemistry CSP Aerosol Chemistry data";
    Float64 Westernmost_Easting 147.481;
  }
}

 

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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.

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.


 
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