R/V Ronald H. Brown Data Info

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.
Hg: reported every second.
VOCSsGCMS: Start_time / Stop_time 5 minute measurement every half hour

Ship Parameters

Fog

Fog and water measured with cavity ring-down instrument.
Time: 1 minute averages aligned to Start_UTC
Reported parameter names and units:
SaturationRatio: Saturation Ratio (total water content divided by the saturation water vapor.)
LWC: Liquid Water Content (mL/m3)
SurfaceAreaFog: units of um2/cm3
FogRating: Flag for fog and non-fog conditions

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)
RainRate: Rain rate (mm/hr)
RelHumidity: Relative Humidity (%)
WindDir: Wind Direction (deg)
WindSpd: 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:
ShipSpd: Ship Speed (knots)
ShipCourse: Ship Course (deg)
GyroHeading: Gyro Heading (deg)
RelWindDir: Relative Wind Direction (deg)
RelWindSpd: Relative Wind Speed (m/s)
SeaSurfTemp: Sea Surface Temperature (C)
Salinity: (PSU)

ShipPos

Ship Position Parameters measured by GPS
Time: 1 minute averages aligned to Start_UTC
Reported parameter names and units:
GpsLat: GPS Latitude (deg)
GpsLon: GPS Longitude (deg)

Chemical Species

Carbon monoxide measured using Vacuum-UV resonance fluorescence.
Time: 1 minute averages aligned to Start_UTC
Reported parameter names and units:
CO_ppbv: Carbon Monoxide (ppbv)

CO2

Carbon Dioxide measured using non-dispersive IR absorbance.
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 instrument
Time: 1 minute averages aligned to Start_UTC
Reported parameter names and units:
H2O_ppth: Water (ppth)

H2OMerged

Water vapor averaged from LI-COR 7000 instrument, and Vaisala HMP45A capacitance RH probe.
Time: 1 minute averages aligned to Start_UTC
Reported parameter names and units:
H2O_ppth_net: Averaged 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)

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

NO2CRD

Nitrogen Dioxide measured using Cavity Ring-Down.
Time: 1 minute averages aligned to Start_UTC
Reported parameter names and units:
NO2_CRD_ppbv: NO2 (ppbv)
NO2_CRD_error_ppbv: NO2 1 sigma uncertainty (ppbv)

NO2ph

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)

O3clAL

Ozone measured using Chemiluminescence.
Time: 1 minute averages aligned to Start_UTC
Reported parameter names and units:
O3cl_ppb: O3 (ppb)

O3uvAL

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

PANs

Peroxyacyl Nitrates measured using GC/ECD.
Time: 1 minute averages aligned to Start_UTC
Reported parameter names and units:
PAN_ppbv: PAN (ppbv)
PPN_ppbv: PPN (ppbv)
MPAN_ppbv: MPAN (ppbv)

SO2AL

Sulfur Dioxide measured using UV Pulsed Fluorescence (TECO 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:
methanol, acetonitrile, acetaldehyde, MTBE, acetone, acetic acid, DMS, isoprene, sum of MVK+MACR, MEK, toluene, sum of xylenes, Sum of C9-benzenes, sum of monoterpenessum monoterpenes

Aerosols

ExtCRD

Aerosol light extinction measured using Cavity Ring-Down Aerosol Extinction Spectrometer.
Time: 1 minute averages aligned to Start_UTC
Reported parameter names and units:
Ext_1064: Aerosol Extinction Coefficient at 1064 nm
Ext_683: Aerosol Extinction Coefficient at 683 nm
Ext_532: Aerosol Extinction Coefficient at 532 nm
Ext_532_Ref: Aerosol Extinction reference at 532 nm
Ext_355: Aerosol Extinction Coefficient at 355 nm
fracRH: Humidity dependence, extinction coefficient (humid)/extinction coefficient (dry)
Angstrom: Angstrom Exponent of Extinction
RH_main: Relative Humidity of main channel
T_main: Temperature of the main instrument channel (C)
T_ext: External Temperature (C)

Radiation

jNO2

Photolysis rate (j value) for NO2 measured using filter radiometer.
Time: 1 minute averages aligned to Start_UTC
Reported parameter names and units:
jNO2:j value for up-welling and down-welling radiation for NO2.

jNO3

Photolysis rate (j value) for NO3 measured using filter radiometer.
Time: 1 minute averages aligned to Start_UTC
Reported parameter names and units:
jNO3: j values for up-welling and down-welling radiation for NO3.

jO3

Photolysis rate (j value) for O3 measured using filter radiometer.
Time: 1 minute averages aligned to Start_UTC
Reported parameter names and units:
jO3: j values for up-welling and down-welling radiation for O3.

ShipRad

Insolation measured using standard ship board instruments.
Time: 1 minute averages aligned to Start_UTC
Reported parameter names and units:
Insolation: In units of watt/m2.