Attributes {
 s {
  time {
    String _CoordinateAxisType "Time";
    Float64 actual_range 1.4005872e+9, 1.4020002e+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 1800, 1800;
    String coords "time";
    String ioos_category "Time";
    String long_name "Duration";
    String units "second";
  }
  latitude {
    String _CoordinateAxisType "Lat";
    Float64 actual_range 33.1885, 42.4997;
    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 -70.8902, -60.5902;
    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;
  }
  radon {
    Float64 _FillValue NaN;
    Float64 actual_range 29.5, 1325.2;
    Float64 colorBarMaximum 40000.0;
    Float64 colorBarMinimum 0.0;
    String coords "time";
    String instrument "Dual flow loop";
    String ioos_category "Unknown";
    String long_name "Radon";
    String source "surface observation";
    String standard_name "radioactivity_concentration_of_222rn_in_air";
    String units "mBq m-3";
    Float64 valid_max 30000.0;
    Float64 valid_min 0.0;
  }
 }
  NC_GLOBAL {
    String cdm_data_type "Trajectory";
    String cdm_trajectory_variables "trajectory_id";
    String comment "Radon:
The PMEL radon instrument is a \"dual flow loop, two filtered radon detector\". The general features of the instrument are described in Whittlestone and Zahorowski, Baseline radon detectors for shipboard use: Development and deployment in the First Aerosol Characterization Experiment (ACE1), J. Geophys. Res., 103, 16,743-16,751, 1998. The instrument response is due to radon gas, not radon daughters (all of the existing radon daughters are filtered out before entering the decay/counting tank). The instrument registers the total number of decay counts per 30 minute interval on a filter (wire screen) arising from the decay of radon in the tank. The volume of the decay/counting tank was 905 l and the sample flow rate into and out of the tank was typically 70 l/min. The response time of the radon instrument is limited to about 30 minutes by the radiological decay time constants of the radon daughters on the wire screen filter. Thus, the start time given in the data file is 15 minutes prior to the midpoint of the counting interval. The instrument was calibrated with a known radon source in Seattle before the cruise and a second calibration was performed after the instrument was shipped back to PMEL. Radon concentrations are given in mBq m-3.";
    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=786";
    Float64 Easternmost_Easting -60.5902;
    String featureType "Trajectory";
    Float64 geospatial_lat_max 42.4997;
    Float64 geospatial_lat_min 33.1885;
    String geospatial_lat_units "degrees_north";
    Float64 geospatial_lon_max -60.5902;
    Float64 geospatial_lon_min -70.8902;
    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 "2025-05-10T08:57:43Z (local files)
2025-05-10T08:57:43Z https://data.pmel.noaa.gov/pmel/erddap/tabledap/ACG_WACS-2_Knorr_radon.das";
    String infoUrl "https://www.pmel.noaa.gov/acg/data/index.html";
    String institution "NOAA";
    String keywords "222rn, above, air, altitude, atmosphere, atmospheric, chemistry, chla, chlorophyll, chlorophyll-a, commerce, concentration, data, datetime, department, doc, duration, earth, Earth Science > Atmosphere > Altitude > Station Height, environmental, height, identifier, laboratory, latitude, level, longitude, marine, mean, noaa, pacific, pmel, radioactivity, radioactivity_concentration_of_222rn_in_air, radon, science, sea, station, time, trajectory, trajectory_id, wacs, wacs-2";
    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 42.4997;
    String platform "Knorr";
    String product_version "0";
    String project "WACS-2";
    String sourceUrl "(local files)";
    Float64 Southernmost_Northing 33.1885;
    String standard_name_vocabulary "CF Standard Name Table v70";
    String subsetVariables "trajectory_id, duration, altitude";
    String summary "Core WACS 2014 Objectives

    1. Characterization of freshly emitted SSA. Freshly emitted SSA will be generated with
NOAA Pacific Marine Environmental Laboratory's (PMEL) Sea Sweep particle
generator. Sea Sweep allows for the generation and sampling of nascent
particles without contamination and modification by existing atmospheric particles
and gases (Bates et al., J. Geophys. Res., 2012). Properties of the particles to be
characterized include chemical composition, size distribution, number concentration,
cloud-nucleating ability, light scattering as a function of relative humidity, and light
absorption.

2. Characterization of surface and column seawater properties. Surface seawater
properties to be measured include fluorescence (chlorophyll-a), particulate organic
carbon (POC), dissolved organic carbon (Department of Commerce (DOC)), dimethylsulfide (DMS), temperature,
salinity, bubble surface tension, exopolymer gels, phytoplankton species composition,
and nutrients.

3. Assessment of the impact of surface seawater properties on SSA. The response of
nascent SSA properties (composition, size distribution, cloud-nucleating ability) to
changes in ocean biological regime will be determined.";
    String time_coverage_end "2014-06-05T20:30:00Z";
    String time_coverage_start "2014-05-20T12:00:00Z";
    String title "PMEL Atmospheric Chemistry WACS-2 Radon data";
    Float64 Westernmost_Easting -70.8902;
  }
}