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ERDDAP > info > EUREC4A_ATOMIC_RonBrown_PMEL_CN_O3_v1

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   set  data   graph     PMEL Atmospheric Chemistry ATOMIC CN_O3 1 minute data    ?   F   I   M   background (external link) RSS Subscribe
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EUREC4A_ATOMIC_RonBrown_PMEL_CN_O3_v1

The Dataset's Variables and Attributes

Row Type Variable Name Attribute Name Data Type Value
attribute NC_GLOBAL _NCProperties String version=2,netcdf=4.7.4,hdf5=1.10.6
attribute NC_GLOBAL cdm_data_type String Trajectory
attribute NC_GLOBAL cdm_trajectory_variables String trajectory_id
attribute NC_GLOBAL comment String Unless otherwise noted, ambient aerosol particles were sampled at 18 m above sea level through a heated mast. The mast extended 5 m above and forward of the aerosol measurement container. The inlet was a rotating cone-shaped nozzle that was automatically positioned into the relative wind to maintain nominally isokinetic flow and minimize the loss of supermicrometer particles. Air entered the inlet through a 5 cm diameter hole, passed through a 7 degree expansion cone, and then into the 20 cm inner diameter sampling mast. The flow through the mast was 1 m3 min-1. The transmission efficiency of the inlet for particles with aerodynamic diameters less than 6.5 um (the largest size tested) is greater than 95% [Bates et al., 2002].

The bottom 1.5 m of the mast were heated to establish a stable reference relative humidity (RH) for the sample air of in the controlled range of 55 to 60 %RH. Twenty one 1.6 cm inner diameter stainless steel tubes extending into the heated portion of the mast were connected to downstream aerosol instrumentation with either conductive silicon tubing or stainless steel tubing for analysis of organic aerosol.
attribute NC_GLOBAL contributor_name String Coffman, Derek;Johnson, James;Quinn, Patricia;Bates, Tim;Upchurch, Lucia
attribute NC_GLOBAL Conventions String CF-1.6, COARDS, ACDD-1.3
attribute NC_GLOBAL creator_email String james.e.johnson at noaa.gov
attribute NC_GLOBAL creator_name String Johnson, James
attribute NC_GLOBAL creator_url String https://saga.pmel.noaa.gov (external link)
attribute NC_GLOBAL date_created String 2020-11-30T17:20:26Z
attribute NC_GLOBAL Easternmost_Easting double -50.9246
attribute NC_GLOBAL featureType String Trajectory
attribute NC_GLOBAL geospatial_lat_max double 15.8652
attribute NC_GLOBAL geospatial_lat_min double 12.7865
attribute NC_GLOBAL geospatial_lat_units String degrees_north
attribute NC_GLOBAL geospatial_lon_max double -50.9246
attribute NC_GLOBAL geospatial_lon_min double -59.6588
attribute NC_GLOBAL geospatial_lon_units String degrees_east
attribute NC_GLOBAL history String file created by NOAA/PMEL/ACG
attribute NC_GLOBAL infoUrl String https://saga.pmel.noaa.gov (external link)
attribute NC_GLOBAL institution String NOAA PMEL Atmospheric Chemistry
attribute NC_GLOBAL keywords String aerosol, air, atmosphere, atmospheric, atomic, chemistry, compounds, concentration, contaminants, data, earth, Earth Science > Atmosphere > Air Quality > Tropospheric Ozone, Earth Science > Atmosphere > Atmospheric Chemistry > Oxygen Compounds, Earth Science > Atmosphere > Atmospheric Chemistry > Oxygen Compounds > Ozone, environmental, fraction, identifier, laboratory, latitude, longitude, marine, minute, mixing, mole, mole_fraction_of_ozone_in_air, noaa, number, number_concentration_of_aerosol_particles_at_stp_in_air, O2, oxygen, ozone, pacific, particles, pmel, quality, ratio, science, statistics, stp, time, trajectory, trajectory_id, tropospheric, ufcn, ultrafine
attribute NC_GLOBAL keywords_vocabulary String GCMD Science Keywords
attribute NC_GLOBAL license String 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.
attribute NC_GLOBAL Northernmost_Northing double 15.8652
attribute NC_GLOBAL platform String RHBrown
attribute NC_GLOBAL product_version String 1
attribute NC_GLOBAL project String ATOMIC
attribute NC_GLOBAL sourceUrl String (local files)
attribute NC_GLOBAL Southernmost_Northing double 12.7865
attribute NC_GLOBAL standard_name_vocabulary String CF Standard Name Table v55
attribute NC_GLOBAL subsetVariables String trajectory_id
attribute NC_GLOBAL summary String 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
attribute NC_GLOBAL time_coverage_end String 2020-02-11T23:59:00Z
attribute NC_GLOBAL time_coverage_start String 2020-01-07T18:00:00Z
attribute NC_GLOBAL title String PMEL Atmospheric Chemistry ATOMIC CN_O3 1 minute data
attribute NC_GLOBAL Westernmost_Easting double -59.6588
attribute NC_GLOBAL Westernnmost_Easting double -59.6588
variable time   double  
attribute time _CoordinateAxisType String Time
attribute time actual_range double 1.57842E9, 1.58146554E9
attribute time axis String T
attribute time calendar String gregorian
attribute time colorBarMaximum double 1.582E9
attribute time colorBarMinimum double 1.578E9
attribute time ioos_category String Time
attribute time long_name String Time
attribute time standard_name String time
attribute time time_origin String 01-JAN-1970 00:00:00
attribute time units String seconds since 1970-01-01T00:00:00Z
variable trajectory_id   String  
attribute trajectory_id cf_role String trajectory_id
attribute trajectory_id ioos_category String Identifier
attribute trajectory_id long_name String trajectory id
variable latitude   double  
attribute latitude _CoordinateAxisType String Lat
attribute latitude _FillValue double -1.0E34
attribute latitude actual_range double 12.7865, 15.8652
attribute latitude axis String Y
attribute latitude colorBarMaximum double 90.0
attribute latitude colorBarMinimum double -90.0
attribute latitude comment String In the one minute files the position is treated somewhat differently from all the other data. The position given is the ship's position at the start of the one minute 'averaging' period. All other data are a true average. The PMEL GPS was the primary source. The Ship's GPS was used when there were missing data in the PMEL record
attribute latitude epic_code String 500
attribute latitude instrument String GPS
attribute latitude ioos_category String Location
attribute latitude long_name String Latitude
attribute latitude standard_name String latitude
attribute latitude units String degrees_north
attribute latitude valid_max double 90.0
attribute latitude valid_min double -90.0
variable longitude   double  
attribute longitude _CoordinateAxisType String Lon
attribute longitude _FillValue double -1.0E34
attribute longitude actual_range double -59.6588, -50.9246
attribute longitude axis String X
attribute longitude colorBarMaximum double 180.0
attribute longitude colorBarMinimum double -180.0
attribute longitude comment String In the one minute files the position is treated somewhat differently from all the other data. The position given is the ship's position at the start of the one minute 'averaging' period. All other data are a true average. The PMEL GPS was the primary source. The Ship's GPS was used when there were missing data in the PMEL record
attribute longitude epic_code String 502
attribute longitude ioos_category String Location
attribute longitude long_name String Longitude
attribute longitude standard_name String longitude
attribute longitude units String degrees_east
attribute longitude valid_max double 180.0
attribute longitude valid_min double -180.0
variable ozone   double  
attribute ozone _FillValue double -1.0E34
attribute ozone actual_range double 12.119, 46.984
attribute ozone colorBarMaximum double 1.0
attribute ozone colorBarMinimum double 0.0
attribute ozone comment String Air was pulled from 16 m above sea level through a 1/4 inch teflon line at approximately 1 liter min-1 into a Thermo Environmental Instruments Model 49c ozone analyzer. The air inlet was approximately 2 meters below the aerosol inlet. During periods when the relative wind was behind the beam, there were obvious periods when ship exhaust was reacting with ozone, resulting in sudden spikes of low ozone. These spikes of low ozone have been edited out. The data are reported as one minute averages in units of ppb.
attribute ozone epic_code String 1807
attribute ozone instrument String Thermo Environmental Instruments ozone analyzer ( Model 49c, sn: 0519412239 )
attribute ozone ioos_category String Contaminants
attribute ozone long_name String Ozone Mixing Ratio
attribute ozone missing_value double -999.0
attribute ozone source String surface observation
attribute ozone standard_name String mole_fraction_of_ozone_in_air
attribute ozone units String ppb
attribute ozone valid_max double 250.0
attribute ozone valid_min double 0.0
variable cn   double  
attribute cn _FillValue double -1.0E34
attribute cn actual_range double 76.1667, 35002.9
attribute cn colorBarMaximum double 100.0
attribute cn colorBarMinimum double 0.0
attribute cn comment String One of the twenty one 1.6 cm diameter tubes was used to supply ambient air to TSI 3010 (CN_Direct), a Brechtel aMCPC (CN_Stack) and TSI 3025A (UFCN_Direct) particle counters. Another one of the tubes was used to supply ambient air to TSI3785 (UFCN_Chem) and Aerosol Devices MAGIC210 (CN_MART) particle counters. The 3010, aMCPC, 3025, 3785 and MAGIC210 measure all particles larger than roughly 12, 5, 3, 5 and 5 nm respectively. The total particle counts from each instrument were recorded each second. The data were filtered to eliminate periods of calibration and instrument malfunction and zero air periods, and periods of obvious ship contamination from the R/V Brown (based on relative wind and high CN counts). The "best" filtered values were chosen to represent CN>12 (CN) and ultra-fine (UFCN) particle concentrations. The best CN values are primarily from CN_Direct with data from CN_Stack used to fill in periods where the CN_Direct data were not available. Similarly, the UFCN values are primarily from UFCN_Direct with the UFCN_Chem and CN_MART data used to fill in periods where UFCN_Direct data were not available. These "best" data were averaged into one minute periods. One second data are available upon request.
attribute cn epic_code String 1853
attribute cn instrument String TSI 3010 (sn: 2251); Brechtel aMCPC (sn: 013); Aerosol Devices MAGIC210 (sn: 210-071)
attribute cn ioos_category String Statistics
attribute cn long_name String Number Concentration of Particles
attribute cn missing_value double -999.0
attribute cn source String surface observation
attribute cn standard_name String number_concentration_of_aerosol_particles_at_stp_in_air
attribute cn units String cm-3
attribute cn valid_max double 50000.0
attribute cn valid_min double 0.0
variable ufcn   double  
attribute ufcn _FillValue double -1.0E34
attribute ufcn actual_range double 76.3347, 75773.5
attribute ufcn colorBarMaximum double 100.0
attribute ufcn colorBarMinimum double 0.0
attribute ufcn comment String One of the twenty one 1.6 cm diameter tubes was used to supply ambient air to TSI 3010 (CN_Direct), a Brechtel aMCPC (CN_Stack) and TSI 3025A (UFCN_Direct) particle counters. Another one of the tubes was used to supply ambient air to TSI3785 (UFCN_Chem) and Aerosol Devices MAGIC210 (CN_MART) particle counters. The 3010, aMCPC, 3025, 3785 and MAGIC210 measure all particles larger than roughly 12, 5, 3, 5 and 5 nm respectively. The total particle counts from each instrument were recorded each second. The data were filtered to eliminate periods of calibration and instrument malfunction and zero air periods, and periods of obvious ship contamination from the R/V Brown (based on relative wind and high CN counts). The "best" filtered values were chosen to represent CN>12 (CN) and ultra-fine (UFCN) particle concentrations. The best CN values are primarily from CN_Direct with data from CN_Stack used to fill in periods where the CN_Direct data were not available. Similarly, the UFCN values are primarily from UFCN_Direct with the UFCN_Chem and CN_MART data used to fill in periods where UFCN_Direct data were not available. These "best" data were averaged into one minute periods. One second data are available upon request.
attribute ufcn epic_code String 1852
attribute ufcn instrument String TSI 3025A (sn: 1110); TSI 3785 (sn: 70613009)
attribute ufcn ioos_category String Statistics
attribute ufcn long_name String Number Concentration of Ultrafine Particles
attribute ufcn missing_value double -999.0
attribute ufcn source String surface observation
attribute ufcn standard_name String number_concentration_of_aerosol_particles_at_stp_in_air
attribute ufcn units String cm-3
attribute ufcn valid_max double 50000.0
attribute ufcn valid_min double 0.0

The information in the table above is also available in other file formats (.csv, .htmlTable, .itx, .json, .jsonlCSV1, .jsonlCSV, .jsonlKVP, .mat, .nc, .nccsv, .tsv, .xhtml) via a RESTful web service.


 
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