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 s {
  time {
    String _CoordinateAxisType "Time";
    Float64 actual_range 1.57845612e+9, 1.58126988e+9;
    String axis "T";
    String calendar "gregorian";
    Float64 colorBarMaximum 1.582e+9;
    Float64 colorBarMinimum 1.578e+9;
    String ioos_category "Time";
    String long_name "Midpoint Time of Sample Period";
    String standard_name "time";
    String time_origin "01-JAN-1970 00:00:00";
    String units "seconds since 1970-01-01T00:00:00Z";
  }
  trajectory_id {
    String cf_role "trajectory_id";
    String ioos_category "Identifier";
    String long_name "trajectory id";
  }
  latitude {
    String _CoordinateAxisType "Lat";
    Float64 _FillValue -1.0e+34;
    Float64 actual_range 13.1416, 15.748;
    String axis "Y";
    Float64 colorBarMaximum 90.0;
    Float64 colorBarMinimum -90.0;
    String epic_code "500";
    String instrument "GPS";
    String ioos_category "Location";
    String long_name "Midpoint Latitude of Sample Period";
    String standard_name "latitude";
    String units "degrees_north";
  }
  longitude {
    String _CoordinateAxisType "Lon";
    Float64 _FillValue -1.0e+34;
    Float64 actual_range -59.072, -50.9607;
    String axis "X";
    Float64 colorBarMaximum 180.0;
    Float64 colorBarMinimum -180.0;
    String epic_code "502";
    String ioos_category "Location";
    String long_name "Midpoint Longitude of Sample Period";
    String standard_name "longitude";
    String units "degrees_east";
  }
  IC_Na_sub1 {
    Float64 _FillValue -1.0e+34;
    Float64 actual_range 0.025, 0.213;
    Float64 colorBarMaximum 0.25;
    Float64 colorBarMinimum 0.0;
    String epic_code "1920";
    String instrument "Impactor (CH-1)";
    String ioos_category "Unknown";
    String long_name "Na Concentration in Dp < 1.1um  particles in air, measured by ion chromatography";
    Float64 missing_value -999.0;
    String source "surface observation";
    String units "micrograms m-3";
  }
  IC_Na_super1 {
    Float64 _FillValue -1.0e+34;
    Float64 actual_range 1.04, 6.804;
    Float64 colorBarMaximum 8.0;
    Float64 colorBarMinimum 0.0;
    String epic_code "1921";
    String instrument "Impactor (CH-1)";
    String ioos_category "Unknown";
    String long_name "Na Concentration in 1.1um < Dp < 10um  particles in air,  measured by ion chromatography";
    Float64 missing_value -999.0;
    String source "surface observation";
    String units "micrograms m-3";
  }
  IC_NH4_sub1 {
    Float64 _FillValue -1.0e+34;
    Float64 actual_range 0.021, 0.15;
    Float64 colorBarMaximum 5.0;
    Float64 colorBarMinimum 0.0;
    String epic_code "1923";
    String instrument "Impactor (CH-1)";
    String ioos_category "Unknown";
    String long_name "NH4 Concentration in Dp < 1.1um  particles in air, measured by ion chromatography";
    Float64 missing_value -999.0;
    String source "surface observation";
    String standard_name "mass_concentration_of_ammonium_dry_aerosol_particles_in_air";
    String units "micrograms m-3";
  }
  IC_NH4_super1 {
    Float64 _FillValue -1.0e+34;
    Float64 actual_range 0.0, 0.0;
    Float64 colorBarMaximum 5.0;
    Float64 colorBarMinimum 0.0;
    String epic_code "1924";
    String instrument "Impactor (CH-1)";
    String ioos_category "Unknown";
    String long_name "NH4 Concentration in 1.1um < Dp < 10um  particles in air,  measured by ion chromatography";
    Float64 missing_value -999.0;
    String source "surface observation";
    String standard_name "mass_concentration_of_ammonium_dry_aerosol_particles_in_air";
    String units "micrograms m-3";
  }
  IC_K_sub1 {
    Float64 _FillValue -1.0e+34;
    Float64 actual_range 0.0, 0.222;
    String epic_code "1926";
    String instrument "Impactor (CH-1)";
    String ioos_category "Unknown";
    String long_name "K Concentration in Dp < 1.1um  particles in air, measured by ion chromatography";
    Float64 missing_value -999.0;
    String source "surface observation";
    String units "micrograms m-3";
  }
  IC_K_super1 {
    Float64 _FillValue -1.0e+34;
    Float64 actual_range 0.036, 0.258;
    Float64 colorBarMaximum 0.30000000000000004;
    Float64 colorBarMinimum 0.0;
    String epic_code "1927";
    String instrument "Impactor (CH-1)";
    String ioos_category "Unknown";
    String long_name "K Concentration in 1.1um < Dp < 10um  particles in air,  measured by ion chromatography";
    Float64 missing_value -999.0;
    String source "surface observation";
    String units "micrograms m-3";
  }
  IC_Mg_sub1 {
    Float64 _FillValue -1.0e+34;
    Float64 actual_range 0.003, 0.028;
    Float64 colorBarMaximum 0.03;
    Float64 colorBarMinimum 0.0;
    String epic_code "1929";
    String instrument "Impactor (CH-1)";
    String ioos_category "Unknown";
    String long_name "Mg Concentration in Dp < 1.1um  particles in air, measured by ion chromatography";
    Float64 missing_value -999.0;
    String source "surface observation";
    String units "micrograms m-3";
  }
  IC_Mg_super1 {
    Float64 _FillValue -1.0e+34;
    Float64 actual_range 0.116, 0.759;
    Float64 colorBarMaximum 0.8;
    Float64 colorBarMinimum 0.0;
    String epic_code "1930";
    String instrument "Impactor (CH-1)";
    String ioos_category "Unknown";
    String long_name "Mg Concentration in 1.1um < Dp < 10um  particles in air,  measured by ion chromatography";
    Float64 missing_value -999.0;
    String source "surface observation";
    String units "micrograms m-3";
  }
  IC_Ca_sub1 {
    Float64 _FillValue -1.0e+34;
    Float64 actual_range 0.0, 0.11;
    String epic_code "1932";
    String instrument "Impactor (CH-1)";
    String ioos_category "Unknown";
    String long_name "Ca Concentration in Dp < 1.1um  particles in air, measured by ion chromatography";
    Float64 missing_value -999.0;
    String source "surface observation";
    String units "micrograms m-3";
  }
  IC_Ca_super1 {
    Float64 _FillValue -1.0e+34;
    Float64 actual_range 0.034, 0.866;
    Float64 colorBarMaximum 1.0;
    Float64 colorBarMinimum 0.0;
    String epic_code "1933";
    String instrument "Impactor (CH-1)";
    String ioos_category "Unknown";
    String long_name "Ca Concentration in 1.1um < Dp < 10um  particles in air,  measured by ion chromatography";
    Float64 missing_value -999.0;
    String source "surface observation";
    String units "micrograms m-3";
  }
  IC_MSA_sub1 {
    Float64 _FillValue -1.0e+34;
    Float64 actual_range 0.0, 0.009;
    String epic_code "1956";
    String instrument "Impactor (CH-1)";
    String ioos_category "Unknown";
    String long_name "MSA Concentration in Dp < 1.1um  particles in air, measured by ion chromatography";
    Float64 missing_value -999.0;
    String source "surface observation";
    String units "micrograms m-3";
  }
  IC_MSA_super1 {
    Float64 _FillValue -1.0e+34;
    Float64 actual_range 0.003, 0.007;
    Float64 colorBarMaximum 0.008;
    Float64 colorBarMinimum 0.002;
    String epic_code "1957";
    String instrument "Impactor (CH-1)";
    String ioos_category "Unknown";
    String long_name "MSA Concentration in 1.1um < Dp < 10um  particles in air,  measured by ion chromatography";
    Float64 missing_value -999.0;
    String source "surface observation";
    String units "micrograms m-3";
  }
  IC_Cl_sub1 {
    Float64 _FillValue -1.0e+34;
    Float64 actual_range 0.016, 0.235;
    Float64 colorBarMaximum 0.25;
    Float64 colorBarMinimum 0.0;
    String epic_code "1944";
    String instrument "Impactor (CH-1)";
    String ioos_category "Unknown";
    String long_name "Cl Concentration in Dp < 1.1um  particles in air, measured by ion chromatography";
    Float64 missing_value -999.0;
    String source "surface observation";
    String units "micrograms m-3";
  }
  IC_Cl_super1 {
    Float64 _FillValue -1.0e+34;
    Float64 actual_range 0.0, 11.228;
    String epic_code "1945";
    String instrument "Impactor (CH-1)";
    String ioos_category "Unknown";
    String long_name "Cl Concentration in 1.1um < Dp < 10um  particles in air,  measured by ion chromatography";
    Float64 missing_value -999.0;
    String source "surface observation";
    String units "micrograms m-3";
  }
  IC_NO3_sub1 {
    Float64 _FillValue -1.0e+34;
    Float64 actual_range 0.01, 0.079;
    Float64 colorBarMaximum 50.0;
    Float64 colorBarMinimum 0.0;
    String epic_code "1947";
    String instrument "Impactor (CH-1)";
    String ioos_category "Unknown";
    String long_name "NO3 Concentration in Dp < 1.1um  particles in air, measured by ion chromatography";
    Float64 missing_value -999.0;
    String source "surface observation";
    String standard_name "mass_concentration_of_nitrate_dry_aerosol_particles_in_air";
    String units "micrograms m-3";
  }
  IC_NO3_super1 {
    Float64 _FillValue -1.0e+34;
    Float64 actual_range 0.067, 1.886;
    Float64 colorBarMaximum 50.0;
    Float64 colorBarMinimum 0.0;
    String epic_code "1948";
    String instrument "Impactor (CH-1)";
    String ioos_category "Unkown";
    String long_name "NO3 Concentration in 1.1um < Dp < 10um  particles in air,  measured by ion chromatography";
    Float64 missing_value -999.0;
    String source "surface observation";
    String standard_name "mass_concentration_of_nitrate_dry_aerosol_particles_in_air";
    String units "micrograms m-3";
  }
  IC_SO4_sub1 {
    Float64 _FillValue -1.0e+34;
    Float64 actual_range 0.111, 0.878;
    Float64 colorBarMaximum 1.0;
    Float64 colorBarMinimum 0.0;
    String epic_code "1950";
    String instrument "Impactor (CH-1)";
    String ioos_category "Unknown";
    String long_name "SO4 Concentration in Dp < 1.1um  particles in air, measured by ion chromatography";
    Float64 missing_value -999.0;
    String source "surface observation";
    String standard_name "mass_concentration_of_sulfate_dry_aerosol_particles_in_air";
    String units "micrograms m-3";
  }
  IC_SO4_super1 {
    Float64 _FillValue -1.0e+34;
    Float64 actual_range 0.144, 1.568;
    Float64 colorBarMaximum 2.0;
    Float64 colorBarMinimum 0.0;
    String epic_code "1951";
    String instrument "Impactor (CH-1)";
    String ioos_category "Unknown";
    String long_name "SO4 Concentration in 1.1um < Dp < 10um  particles in air,  measured by ion chromatography";
    Float64 missing_value -999.0;
    String source "surface observation";
    String standard_name "mass_concentration_of_sulfate_dry_aerosol_particles_in_air";
    String units "micrograms m-3";
  }
  start_time {
    Float64 actual_range 1.57843452e+9, 1.581204e+9;
    String calendar "gregorian";
    Float64 colorBarMaximum 1.582e+9;
    Float64 colorBarMinimum 1.578e+9;
    String ioos_category "Time";
    String long_name "Start Time of Sample Period";
    String standard_name "time";
    String time_origin "01-JAN-1970 00:00:00";
    String units "seconds since 1970-01-01T00:00:00Z";
  }
  stop_time {
    Float64 actual_range 1.57847772e+9, 1.58133576e+9;
    String calendar "gregorian";
    Float64 colorBarMaximum 1.582e+9;
    Float64 colorBarMinimum 1.578e+9;
    String ioos_category "Time";
    String long_name "Stop Time of Sample Period";
    String standard_name "time";
    String time_origin "01-JAN-1970 00:00:00";
    String units "seconds since 1970-01-01T00:00:00Z";
  }
  sample_number {
    Float64 _FillValue -1.0e+34;
    Float64 actual_range 1.0, 27.0;
    Float64 colorBarMaximum 100.0;
    Float64 colorBarMinimum 0.0;
    String ioos_category "Statistics";
    String long_name "Sample Number";
    Float64 missing_value -999.0;
    String units "1";
  }
 }
  NC_GLOBAL {
    String _NCProperties "version=2,netcdf=4.7.4,hdf5=1.10.6";
    String cdm_data_type "Trajectory";
    String cdm_trajectory_variables "trajectory_id";
    String comment "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-, NO3-, SO4=, Na+, NH4+, K+, Mg+2, and Ca+2. Sampling periods ranged from 12 to 24 hours. The RH of the sampled air stream was measured a few inches upstream from the impactors. The 2-stage impactors cut the samples into submicrometer (Daero < 1.1 um at 60% RH), and supermicrometer (1.1 um < Daero < 10 um) samples. Aerosol mass size distributions from the 7-stage impactors (size cuts at: 0.18, 0.31, 0.55, 1.1, 2.0, 4.1 and 10 um) are available for download at: http://saga.pmel.noaa.gov/data/chemdist.php?cruise=ATOMIC.\r
\r
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 and additional 5 ml of distilled deionized water were added to the solution and the substrates were extracted by sonicated for 30 min. For the 7 stage impactor (sizes 0.18, 0.31, 0.55 and 1.1), the extraction volume was reduced to 0.5mL:2.5mL methanol:water in later samples (12 and 15 through 27) to increase detection. The extracts were analyzed by ion chromatography [Quinn et al., 2000]. 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.\r
\r
Concentrations are reported as ug/m3 at STP (25C and 1 atm). Values below the detection limit are denoted with a -8888 in the .acf file or zero in the .itx and .ict files, missing data are denoted with a -9999 in the .acf and .ict files and NaN in the .itx file.\r
\r
Berner et al., Sci. Total Environ., 13, 245 - 261, 1979.\r
\r
Quinn et al., J. Geophys. Res., 105, 6785 - 6805, 2000.";
    String contributor_name "Coffman, Derek;Johnson, James;Quinn, Patricia;Bates, Tim;Upchurch, Lucia";
    String Conventions "CF-1.6, COARDS, ACDD-1.3";
    String creator_email "james.e.johnson@noaa.gov";
    String creator_name "Johnson, James";
    String creator_url "https://saga.pmel.noaa.gov";
    String date_created "2020-11-30T17:20:49Z";
    Float64 Easternmost_Easting -50.9607;
    String featureType "Trajectory";
    Float64 geospatial_lat_max 15.748;
    Float64 geospatial_lat_min 13.1416;
    String geospatial_lat_units "degrees_north";
    Float64 geospatial_lon_max -50.9607;
    Float64 geospatial_lon_min -59.072;
    String geospatial_lon_units "degrees_east";
    String history "file created by NOAA/PMEL/ACG
2024-04-26T17:32:09Z (local files)
2024-04-26T17:32:09Z https://data.pmel.noaa.gov/pmel/erddap/tabledap/EUREC4A_ATOMIC_RonBrown_PMEL_IC_Chem_v0.das";
    String infoUrl "https://saga.pmel.noaa.gov";
    String institution "NOAA PMEL Atmospheric Chemistry";
    String keywords "1.1um, 10um, air, ammonia, ammonium, atmospheric, atomic, chemistry, chromatography, collected, concentration, data, earth, environmental, 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_SO4_sub1, IC_SO4_super1, identifier, impactor, ion, laboratory, latitude, longitude, marine, measured, midpoint, mole, msa, n02, nh4, nitrate, no3, noaa, number, nutrients, ocean, oceans, pacific, particles, period, pmel, sample, sample_number, science, sea, so4, start, start_time, statistics, stop, stop_time, time, trajectory, trajectory_id";
    String keywords_vocabulary "GCMD Science Keywords";
    String license "The data may be used and redistributed for free but is not intended for legal use, since it may contain inaccuracies. Neither the data Contributor, ERD, NOAA, nor the United States Government, nor any of their employees or contractors, makes any warranty, express or implied, including warranties of merchantability and fitness for a particular purpose, or assumes any legal liability for the accuracy, completeness, or usefulness, of this information.";
    Float64 Northernmost_Northing 15.748;
    String platform "RHBrown";
    String product_version "0";
    String project "ATOMIC";
    String sourceUrl "(local files)";
    Float64 Southernmost_Northing 13.1416;
    String standard_name_vocabulary "CF Standard Name Table v55";
    String subsetVariables "trajectory_id";
    String summary "ATOMIC (Atlantic Tradewind Ocean Atmosphere Mesoscale Interaction Campaign) 2020 Field campaign: Surface meteorological and ship navigation collected from the RV Ronald H. Brown by the National Oceanic and Atmospheric Administration (NOAA) Pacific Marine Environmental Laboratory (PMEL) Atmospheric Chemistry Group in the tropical North Atlantic ocean from 2020-01-09 to 2020-02-13";
    String time_coverage_end "2020-02-09T17:38:00Z";
    String time_coverage_start "2020-01-08T04:02:00Z";
    String title "PMEL Atmospheric Chemistry ATOMIC Impactor collected Ion Chemistry";
    Float64 Westernmost_Easting -59.072;
    Float64 Westernnmost_Easting -59.072;
  }
}