WP-3D 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: Almost all of the P-3 data is time-aligned to AOCTimewave, which is 1 second time resolution in integer seconds. It starts at the time the aircraft takes off, and ends at landing. The one file type that isn't aligned to AOCTimewave is the file VOCsAWAS, which uses WAS_TimeStart_UTC / WAS_TimeEnd_UTC (variable intervals corresponding to the times that the canisters are filled).

Aircraft Parameters

AircraftPos

Aircraft Position Parameters measured with various aircraft sensors
Time: 1 Hz data aligned to AOCTimewave
Reported parameter names and units:
GpsLat: GPS Latitude (deg)
GpsLon: GPS Longitude (deg)
GpsAlt: GPS Altitude (m)
PAlt: Pressure Altitude (m) Derived from the pressure and uses the standard atmosphere to calculate an altitude.
RAlt: Radar Altitude (m) Aircraft altitude above ground.

AircraftMet

Aircraft Meteorological Parameters measured with various aircraft sensors.
Time: 1 Hz data aligned to AOCTimewave
Reported parameter names and units:
AmbTemp: Ambient Temperature (C)
DewPtTemp: Dew Point Temperature (C) measured by chilled mirror hygrometer.
DewPtTempTDL: TDL Dew Point Temperature (C) measured with Tunable Diode Laser. This is a fast response measurement, but ocassionally didn't work during the Gulf flights.
H2Omr: H2O mixing ratio (g/kg) Derived from dew point instrument.
PotTemp: Potential Temperature (K)
RelHumidity: Relative Humidity (%) Derived from dew point instrument.
SeaSfcTemp: Sea Surface Temperature (C)
StaticPrs: Static Pressure (mb)
VertWindSpd: Vertical Wind Speed (m/s)
WindDir: Wind Direction (deg)
WindSpd: Wind Speed (m/s)

AircraftMis

Aircraft Miscellaneous Parameters measured with various aircraft sensors.
Time: 1 Hz data aligned to AOCTimewave
Reported parameter names and units:
Attack: Attack Angle (deg)
CabinPrs: Cabin Pressure (mb)
GndSpd: Ground Speed (m/s)
Heading: Heading (deg)
Pitch: Pitch (deg)
Roll: Roll (deg)
Slip: Slip (deg)
TrueAirSpd: True Air Speed (m/s)

AircraftExt

Aircraft Extras: Smoothed winds using 31 point boxcar.
Time: 1 Hz data aligned to AOCTimewave
Reported parameter names and units:
WindDir_smooth: Smoothed wind direction (deg)
WindSpd_smooth: Smoothed wind speed (m/s)

Chemical Parameters

Carbon Monoxide measured using VUV Resonance Fluorescence.
Time: 1 Hz data aligned to AOCTimewave
Reported parameter names and units:
CO_ppbv: CO (ppbv)

CO2CH4

Carbon Dioxide and Methane measured using cavity ring-down spectrometer instrument by Picarro.
Time: 1 Hz data aligned to AOCTimewave
Reported parameter names and units:
CO2_ppmv:CO2 (ppmv)
CO2_ppmv_1sigma: 1 sigma uncertainty
CH4_ppbv:CH4 (ppbv)
CH4_ppbv_1sigma: 1 sigma uncertainty

HNO3

Nitric Acid measured using Chemical Ionization Mass Spectrometer (CIMS).
Time: 1 Hz data aligned to AOCTimewave
Reported parameter names and units:
HNO3_ppbv: HNO3 (ppbv)

NH3

Ammonia measured using Chemical Ionization Mass Spectrometer (CIMS).
Time: 1 Hz data aligned to AOCTimewave
Reported parameter names and units:
NH3_ppbv: NH3 (ppbv)
NH3_1sigma: 1 sigma uncertainty

Nitric Oxide measured using NO/O3 Chemiluminescence.
Time: 1 Hz data aligned to AOCTimewave
Reported parameter names and units:
NO_ppbv: NO (ppbv)
NO_1sigma: 1 sigma uncertainty

NO2

Nitrogen Dioxide measured using Photolysis and NO/O3 Chemiluminescence.
Time: 1 Hz data aligned to AOCTimewave
Reported parameter names and units:
NO2_ppbv: NO2 (ppbv)
NO2_1sigma: 1 sigma uncertainty

NOy

Total reactive Nitrogen Oxides measured using Au Converter and NO/O3 Chemiluminescence.
Time: 1 Hz data aligned to AOCTimewave
Reported parameter names and units:
NOy_ppbv: NOy (ppbv)
NOy_1sigma: 1 sigma uncertainty

Ozone measured using Chemiluminescence.
Time: 1 Hz data aligned to AOCTimewave
Reported parameter names and units:
O3_ppbv: O3 (ppbv)
O3_1sigma: 1 sigma uncertainty

PANs

Peroxyacyl Nitrates measured using Chemical Ionization Mass Spectrometer (CIMS).
Time: 1 Hz data aligned to AOCTimewave
Reported parameter names and units:
PAN_ppbv: PAN (ppbv)

PTRMSHCHO

Formaldehyde measured using Proton Transfer Reaction Mass Spectrometer (PTRMS).
Time: Reported about every 15 seconds, aligned to AOCTimewave.
Reported parameter names and units:
Formaldehyde (pptv)

VOCsAWAS

Volatile organic compounds (VOCs) using Advanced Whole Air Sampler (AWAS)
Time: Aligned to WAS_TimeStart_UTC, WAS_TimeEnd_UTC
Reported parameter names and units:
Too many to list (about 100)

VOCsPTRMS

VOCs measured using Proton Transfer Reaction Mass Spectrometer (PTRMS).
Time: Reported about every 15 seconds on AOCTimewave, but actual times vary. Contact PI for details.
Reported parameter names and units:
methanol, acetonitrile, acetaldehyde, acetone, isoprene, MVK_MACR, MEK, benzene, toluene, C8_aromatics, C9_aromatics, monoterpenes: all in units of pptv

Aerosol Parameters

AMS

Aerosol Bulk Composition using Aerosol Mass Spectrometer (AMS).
Time: 10 second data reported using AOCTimewave
Reported parameter names and units:
AMS_SO4: SO4 (micrograms per standard cubic meter of air)
AMS_NO3: NO3 (micrograms per standard cubic meter of ai)r
AMS_Chl: Chlorine (micrograms per standard cubic meter of air)
AMS_NH4: NH4 (micrograms per standard cubic meter of air)
AMS_Org: Organics (micrograms per standard cubic meter of air)
AMS_Total: Total particles (micrograms per standard cubic meter of air)
AMS_flag_HigherUncertainty: Flag for data of higher uncertainty

CCN

CCN measured using Droplet Measurements Stream-Wise Thermal Gradient Continous-Flow CCN Counter.
Time: 1Hz data reported on AOCTimewave
Reported parameter names and units:
Number_Concentration: CCN (#/cm3)
Supersaturation: (%)
CCN_Concentration
CCN25_30 at 25-30% supersaturation, etc
CCN30_35
CCN35_40
CCN40_45
CCN45_50
CCN50_55
CCN55_60
CCN60_65

CRDExt

Cavity Ring-Down Extinction of Light by Aerosol
Time: 1Hz data reported on AOCTimewave
Aerosol optical properties measured using cavity ring-down spectrometer.
Reported parameter names and units:
ext_dry_532nm: Dry 532nm aerosol extinction (Mm-1 at RH < 5%, 273.15K, 100000Pa.)
ext_gammaRH: Gamma parameter describing RH dependence of extinction.
ext_angstrom: Angstrom exponent describing wavelength dependence of extinction.

NAerosol

Aerosol Size, Number, Surface, Volume Distribution (NOAA Aerosol)
Time: 1Hz data reported on AOCTimewave
Aerosol sizing instruments: 5-chan CPC, ultra-high sensitivity aerosol size spectrometer, white-light OPC.
Reported parameter names and units:
nfine: particle number concentration, 0.004 to 1.0 um optical diameter (#/cm^3)
sfine: particle surface area, 0.004 to 1.0 um optical diameter (um^2/cm^3)
vfine: particle volume, 0.004 to 1.0 um optical diameter (um^3/cm^3)
ncoarse: particle number concentration, 1.0 to 6.0 um (#/cm^3)
scoarse: particle surface area, 1.0 to 6.0 um (um^2/cm^3)
vcoarse: particle volume, 1.0 to 6.0 um (um^3/cm^3)
ncoarse_smooth: ncoarse with 10s running binomial smoothing (#/cm^3)
scoarse_smooth: scoarse with 10s running binomial smoothing (um^2/cm^3)
vcoarse_smooth: vcoarse with 10s running binomial smoothing (um^3/cm^3)
vfine_ams: fine mode particle volume matching AMS size sensitivities (um^3/cm^3)
vfine_crdext: fine mode particle volume matching CRDext size sensitivities (um^3/cm^3)
cloud_flag: Cloud_flag=1 when clouds present.

PAS

Photoacoustic Absorption Spectrometer
Time: 1Hz data reported on AOCTimewave
Aerosol optical properties measured using photoacoustic absorption spectrometer.
Reported parameter names and units:
PAS_532_dry: total aerosol light absorption at 532nm (Mm-1)

PILSAnion

Aerosol Bulk Ionic Composition (PILS Anion)
Time: Reported on Anion_start_UTC, Anion_mid_UTC, Anion_end_UTC time
Aerosol data measured using Particle Into Liquid Sampling (PILS).
Reported parameter names and units:
Chloride, Nitrate, Sulfate: All reported in units of micrograms per cubic meter

PILSCation

Aerosol Bulk Ionic Composition (PILS Cation)
Time: Reported on Cation_start_UTC, Cation_mid_UTC, Cation_end_UTC time
Aerosol data measured using Particle Into Liquid Sampling (PILS).
Reported parameter names and units:
Ammonium, Calcium, Magnesium, Potassium, Sodium: All reported in units of micrograms per cubic meter

PSAP

Particle Soot Absorption Photometer
Time: 1Hz data reported on AOCTimewave
total aerosol light absorption by filter darkening
Reported parameter names and units:
PSAP_red_sr: aerosol light absorption in the red part of the spectrum (Mm-1)
PSAP_green_sr: aerosol light absorption in the green part of the spectrum (Mm-1)
PSAP_blue_sr: aerosol light absorption in the blue part of the spectrum i(Mm-1)

SP2

Single Particle Soot Photometer
Time: 1Hz data reported on AOCTimewave
NOAA Single-Particle Soot Photometer (SP2)
Reported parameter names and units:
BC_ng_kg: black carbon (ng/kg)
BC_ng_m3: black carbon (ng/m3)

Radiation Parameters

jValBlueCSD

Actinic Flux (NOAA CSD Actinic Flux Spectral Radiometer, AFSR)
Time: 1 Hz data reported on AOCTimewave
Photolysis rates (J-Values).
Reported parameter names and units:
All units in photons cm^-2 s^-1 nm^-1
Up-welling, Down-welling and Combined (sum of Up-welling and Down-welling) J values for many photolysis rates

jValReBlCSD

Actinic Flux (NOAA CSD Actinic Flux Spectral Radiometer, AFSR)
Time: 1 Hz data reported on AOCTimewave
Photolysis rates (J-Values).
Reported parameter names and units:
All units in Photons cm^-2 s^-1 nm^-1
Up-welling, Down-welling and Combined (sum of Up-welling and Down-welling) J values for many photolysis rates

SSFR

SW Spectral / LW Broadband Irradiance from Solar Spectral Flux Radiometer + CG-4
Time: 1 Hz data reported on AOCTimewave
Solar Spectral Flux Radiometer 350-2150 nm. and CG-4 broadband longwave irradiance 4.5-4000 um
Reported parameter names and units:
All units in Photons cm^-2 s^-1 nm^-1
Upward and downward irradiance at several wavelength ranges all in units of W m^-2 nm^-1

SZA

Solar Zenith Angle
Time: 1 Hz data reported on AOCTimewave
Reported parameter names and units:
Solar zenith angle (degrees)