WP-3D Data Info

| Time parameters | Aircraft parameters | Chemical species | Aerosols | Radiation |

File prefixes from the data download page 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 VOCsiWAS2, which uses iWAS2_TimeStart_UTC / iWAS2_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 may have less accuracy than the other dew point measurement.
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 Angle (deg)
Roll: Roll Angle (deg)
Slip: Slip Angle (deg)
TrueAirSpd: True Air Speed (m/s)

LWC

Liquid water content from SEA probe.
Time: 1 Hz data aligned to AOCTimewave
Reported parameter names and units:
LWC: Liquid water content (g / m^3)

Chemical Parameters

ACES

Glyoxal measured using Cavity Enhanced Absorption Spectroscopy.
Time: 1 Hz data aligned to AOCTimewave
Reported parameter names and units:
C2H2O2_ppbv: C2H2O2 (ppbv)

Acid CIMS

Organic and inorganic acids measured using chemical ionization mass spectrometry with acetate as reagent ion.
Time: 1 Hz data aligned to AOCTimewave
Reported parameter names and units:
C1H2O2I1 (ppt)
C3H6O2I1 (ppt)
C3H4O4I1 (ppt)
C4H6O4I1 (ppt)
C5H8O4I1 (ppt)
C10H16O3I1 (ppt)
C9H14O4I1 (ppt)
H1O3N1I1 (ppt)
C2H2O3I1 (ppt)

CARDS

Nitrate, Dinitrogen Pentoxide measured by Cavity Ring-Down Spectroscopy (CRDS).
Time: 1 Hz data aligned to AOCTimewave
Reported parameter names and units:
NO_CaRDS_ppbv: NO (ppbv)
NO2_CaRDS_ppbv: NO2 (ppbv)
O3_CaRDS_ppbv: O3 (ppbv)
NO3_pptv: NO3 (pptv)
N2O5_pptv: N2O5 (pptv)

CO

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

HCHO

Formaldehyde measured using Laser Induced Fluorescence.
Time: 1 Hz data aligned to AOCTimewave
Reported parameter names and units:
HCHO_ppbv: HCHO (ppbv)

HNO3HCOOH

Nitric Acid, Formic Acid, Nitrous Acid, and Nitryl Chloride measured using Chemical Ionization Mass Spectrometer (CIMS).
Time: 1 Hz data aligned to AOCTimewave
Reported parameter names and units:
HNO3_ppbv: HNO3 (ppbv)
HCOOH_ppbv: HCOOH (ppbv)
HONO_ppbv: HONO (ppbv)
ClNO2_HNO3CIMS_ppbv: ClNO2 (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

NO

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

O3

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)
PPN_ppbv: PPN (ppbv)

SO2

Sulfur Dioxide measured using UV Pulsed Fluorescence.
Time: 1 Hz data aligned to AOCTimewave
Reported parameter names and units:
SO2_ppbv: SO2 (ppbv)

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

VOCsiWAS2

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

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

Cloud Condensation Nuclei Counter, uses Droplet Measurements Stream-Wise Thermal Gradient Continous-Flow CCN Counter.
Counts number of particles that serve as a core for new cloud water droplets.
Time: 1Hz data reported on AOCTimewave
Reported parameter names and units:
CCN number concentration at 0 Celcius and 1 atm (cm-3)
CCN number concentration at ambient conditions (cm-3)
Supersaturation (%)

ClearAirKey

Flag for presence of clouds/precip, derived from cloud probes, relative humidity, and video camera from P-3.
Time: 1Hz data reported on AOCTimewave
Reported parameter names and units:
Clear_air_key: flag=1 in clear air; flag = 0 in cloud or preciptiation. (no units)

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_405nm: Dry 405nm aerosol extinction (Mm-1 at RH < 5%, 273.15K, 100000Pa.)
ext_dry_532nm: Dry 532nm aerosol extinction (Mm-1 at RH < 5%, 273.15K, 100000Pa.)
ext_dry_662nm: Dry 662nm aerosol extinction (Mm-1 at RH < 5%, 273.15K, 100000Pa.)

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)

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 (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

jNO2

J values
Time: 1 Hz data reported on AOCTimewave
Photolysis rates (J-Values).
Reported parameter names and units:
j_NO2_up: Upward looking photolysis rates for NO2 (1/s)
j_NO2_down: Downward looking photolysis rates for NO2 (1/s)

jO3

J values
Time: 1 Hz data reported on AOCTimewave
Photolysis rates (J-Values).
Reported parameter names and units:
j_O3_up: Upward looking photolysis rates for O3 (1/s)
j_O3_down: Downward looking photolysis rates for O3 (1/s)