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R/V Ronald H. Brown Data Info

| Time Parameters | Ship Parameters | Chemical Species | Aerosols |

File prefixes from data download are listed below. The file contents are specified and the measurement is described briefly. For more details, see the header of the data file.

Time parameters

Time: 1 Minute averages continuously throughout mission. Start_UTC is the time standard.
Most of the measurements use this time base. Here are the exceptions.
VOCSsGCMS: Start_time / Stop_time 5 minute measurement every half hour

Ship Parameters

ShipMet

Ship Meteorological Parameters measured with various sensors.
Time: 1 minute averages aligned to Start_UTC
Reported parameter names and units:
AmbPrs: Ambient Pressure (mbar)
AmbTemp: Ambient Temperature (C)
RelHumidity: Relative Humidity (%)
SeaSurfTemp: Sea Surface Temperature (C)
SolarZenithAngle: Solar Zenith Angle (deg)
TrueWindDir: True Wind Direction (deg)
TrueWindSpd: True Wind Speed (m/s)

ShipMis

Ship Miscellaneous Parameters measured with various sensors.
Time: 1 minute averages aligned to Start_UTC
Reported parameter names and units:
ShipDir: Ship Direction (deg)
ShipSpd: Ship Speed (m/s)
RelWindDir: Relative Wind Direction (deg)
RelWindSpd: Relative Wind Speed (m/s)

ShipPos

Ship Position Parameters measured by standard ship board instruments.
Time: 1 minute averages aligned to Start_UTC
Reported parameter names and units:
lat: Latitude (deg)
lon: Longitude (deg)

Chemical Species

CO2

Carbon Dioxide measured using non-dispersive IR absorbance, Li_Cor Model LI-7000 CO2/H2O Analyzer.
Time: 1 minute averages aligned to Start_UTC
Reported parameter names and units:
CO2_ppmv: Carbon Dioxide (ppmv)

H2O

Water vapor measured via Non-dispersive IR absorption gas analysis, using LI-COR 7000 CO2/H2O Analyzer.
Time: 1 minute averages aligned to Start_UTC
Reported parameter names and units:
H2O_ppth: Water (ppth)

N2O5

Dinitrogen Pentoxide measured using Cavity Ring-Down.
Time: 1 minute averages aligned to Start_UTC
Reported parameter names and units:
N2O5_pptv: N2O5 (pptv)

NO

Nitric Oxide measured using ozone-induced chemiluminescence.
Time: 1 minute averages aligned to Start_UTC
Reported parameter names and units:
NO_ppbv: NO (ppbv)

NO2

Nitrogen Dioxide measured using Photolysis and NO/O3 Chemiluminescence.
Time: 1 minute averages aligned to Start_UTC
Reported parameter names and units:
NO2_ppbv: NO2 (ppbv)

NO3

Nitrogen Trioxide measured using Cavity Ring-Down.
Time: 1 minute averages aligned to Start_UTC
Reported parameter names and units:
NO3_pptv: NO3 (pptv)

NOy

Total reactive Nitrogen Oxides measured using Au Converter and NO/O3 Chemiluminescence.
Time: 1 minute averages aligned to Start_UTC
Reported parameter names and units:
NOy_ppb: NOy (ppb)

O3uv

Ozone measured via UV absorbance (Thermo Environmental model 49c)
Time: 1 minute averages aligned to Start_UTC
Reported parameter names and units:
O3uv_ppb: UV absorbance O3 (ppb)

PANs

Peroxyacyl Nitrates measured using home-built capillary GC with electron capture detection.
Time: 1 minute averages aligned to Start_UTC
Reported parameter names and units:
PAN_ppbv: PAN (ppbv)
PPN_ppbv: PPN (ppbv)
PiBN_ppbv: PiBN (ppbv)
MPAN_ppbv: MPAN (ppbv)

SO2

Sulfur Dioxide measured using UV Pulsed Fluorescence (TEII Model 43s)
Time: 1 minute averages aligned to Start_UTC
Reported parameter names and units:
SO2_ppb: SO2 (ppb)

VOCsGCMS

Volatile Organic Compounds measured using Gas Chromatograph/Mass Spectrometer.
Time: Averages using Start_time/Stop_time.
Reported parameter names and units:
Too many to list.

VOCsPITMS

Volatile Organic Compounds measured using Proton Transfer Ion Trap/Mass Spectrometer.
Time: 1 minute averages aligned to Start_UTC
Reported parameter names and units:
Acetaldehyde, Acetone, Acetonitrile, Benzene, C10-Benzenes, C8-Benzenes, C9-Benzenes, Isoprene, Methanol, Monoterpenes, Mvk+Methacrolein, Toluene, all in units of ppbv.

Aerosols

AMS

Aerosol Bulk Composition using Aerosol Mass Spectrometer.
Time: Data reported are averages on AMS time base, not aligned with Start_UTC.
Reported parameter names and units:
Organics: ppm
Sulphate: ppm
Ammonium: ppm
Nitrate: ppm
cpc: Condensation Particle Counter