VISITORS: Effective 21 July 2014, Visitor Center Security will no longer accept IDs from some US states for site access. Please see security procedures for details.
 

WP-3D Data Info

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

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. Many of the parameters are on this time base.
Here are the exceptions.
Ethylene: TimeStart / TimeStop (about every 20 seconds)
PILSAnion: Anion_start_UTC / Anion_end_UTC (60 second samples)
PILSCation: Cation_start_UTC / Cation_end_UTC (90 second samples)
PILSWSOC: WSOC_start_UTC / WSOC_end_UTC (3 second averages)
WAS: WAS_TimeStart_UTC / WAS_TimeEnd_UTC (variable intervals)

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)
EquivPotTemp: Equivalent Potential Temperature (K)
H2Omr: H2O mixing ratio (g/kg)
PotTemp: Potential Temperature (K)
RelHumidity: Relative Humidity (%)
StaticPrs: Static Pressure (mb)
TDLH2O: TDL H2O (ppmv)
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)
WASCanNumber: Whole Air Sampler Can Number
WASMotorCurrent: Whole Air Sampler Motor Current
WASManifoldP: Whole Air Sampler Manifold Pressure

Aircraft Extras

Water vapor parameters derived from TDL water vapor instrument calibrated to dew point instrument.
Time: 1 Hz data aligned to AOCTimewave
Reported parameter names and units:
DewPtTempTDL_f: Derived Dew Point Temperature TDL (C)
RelHumidity_f: Derived Relative Humidity (%)
H2Omr_f: Derived H2O mixing ratio (g/kg)
H2Ovp_f: Derived H2O vapor pressure (mb)

Chemical Species

CO

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

CO2

Carbon Dioxide measured using Non-Dispersive InfraRed (NDIR) absorption.
Time: 1 Hz data aligned to AOCTimewave
Reported parameter names and units:
CO2_ppmv:CO2 in ppmv
CO2_ppmv_1sigma: 1 sigma uncertainty

Ethylene

Ethylene measured using Laser Photoacoustic Spectroscopy (LPAS).
Time: Data reported about every 20 sec on ethylene start/stop times
Reported parameter names and units:
Ethylene_ppbv:Ethylene in ppbv

CH2O-AOC

Formaldehyde (CH2O) measured using Tunable Diode Laser Absorption Spectrometry.
Time: 1 Hz data aligned to AOCTimewave
Reported parameter names and units:
CH2O_DFG_AOC_LOD_2Sig_pptv: 2 Sigma limit of detection
CH2O_DFG_AOC_MR_pptv: CH2O mixing ratio
CH2O_DFG_AOC_SMU_2Sig_pptv: 2 Sigma Systematic Measurement Uncertainty
CH2O_DFG_AOC_TMU_2Sig_pptv: 2 Sigma Total Measurement Uncertainty

CH2O-1Sec

Formaldehyde (CH2O) measured using Tunable Diode Laser Absorption Spectrometry.
Time: 1 Hz data aligned to CH2O Start/Stop Time
Reported parameter names and units:
CH2O_DFG_01_StartSOD_secUTC: Start time of the 1 sec averaging period (seconds-UTC)
CH2O_DFG_01_StopSOD_secUTC: Stop time of the 1 sec averaging period (seconds-UTC)
CH2O_DFG_01_MidSOD_secUTC: Mid time of the 1 sec averaging period (seconds-UTC)
CH2O_DFG_01_MR_pptv: CH2O mixing ratio (pptv)
CH2O_DFG_01_AMV_2Sig_pptv: PLACE HOLDER no information in this field
CH2O_DFG_01_LOD_2Sig_pptv: 2 Sigma Limit of Detection of the 1 second CH2O measurement (pptv)
CH2O_DFG_01_SMU_2Sig_pptv: 2 Sigma Systematic Measurement Uncertainty of the 1 second CH2O measurement (pptv)
CH2O_DFG_01_TMU_2Sig_pptv: 2 Sigma Total Measurement Uncertainty of the 1 second CH2O measurement (pptv)

CH2O-10Sec

Formaldehyde (CH2O) measured using Tunable Diode Laser Absorption Spectrometry.
Time: 10 second averages aligned to CH2O Start/Stop Time
Reported parameter names and units:
CH2O_DFG_10_StartSOD_secUTC: Start time of the 10 sec averaging period (seconds-UTC)
CH2O_DFG_10_StopSOD_secUTC: Stop time of the 10 sec averaging period (seconds-UTC)
CH2O_DFG_10_MidSOD_secUTC: Mid time of the 10 sec averaging period (seconds-UTC)
CH2O_DFG_10_MR_pptv: CH2O mixing ratio (pptv)
CH2O_DFG_10_AMV_2Sig_pptv: 2 * Standard Deviation of the 1 second measurements in this period (Ambient Variability) (pptv)
CH2O_DFG_10_LOD_2Sig_pptv: 2 Sigma Limit of Detection of the 10 second CH2O measurement (pptv)
CH2O_DFG_10_SMU_2Sig_pptv: 2 Sigma Systematic Measurement Uncertainty of the 10 second CH2O measurement (pptv)
CH2O_DFG_10_TMU_2Sig_pptv: 2 Sigma Total Measurement Uncertainty of the 10 second CH2O measurement (pptv)

CH2O-1Min

Formaldehyde (CH2O) measured using Tunable Diode Laser Absorption Spectrometry.
Time: 1 minute averages aligned to CH2O Start/Stop Time
Reported parameter names and units:
CH2O_DFG_60_StartSOD_secUTC: Start time of the 60 sec averaging period (seconds-UTC) CH2O_DFG_60_StopSOD_secUTC: Stop time of the 60 sec averaging period (seconds-UTC) CH2O_DFG_60_MidSOD_secUTC: Mid time of the 60 sec averaging period (seconds-UTC) CH2O_DFG_60_MR_pptv: CH2O mixing ratio (pptv) CH2O_DFG_60_AMV_2Sig_pptv: 2 * Standard Deviation of the 1 second measurements in this period (Ambient Variability) (pptv) CH2O_DFG_60_LOD_2Sig_pptv: 2 Sigma Limit of Detection of the CH2O measurement in this period (pptv) CH2O_DFG_60_SMU_2Sig_pptv: 2 Sigma Systematic Measurement Uncertainty of the CH2O measurement in this period (pptv) CH2O_DFG_60_TMU_2Sig_pptv: 2 Sigma Total Measurement Uncertainty of the CH2O measurement in this period (pptv)

H2SO4

Hydroxyl Radical (OH), Peroxy Radicals (HO2 and RO2) Sulfuric Acid
Time: 1 Hz data aligned to AOCTimewave
Measurement technique: Chemical Ionization Mass Spectrometer (CIMS).
Reported parameter names and units:
OH_nd: OH (molecules / cm^3)
Sulf_nd: H2SO4 (molecules / cm^3)
HO2RO2_nd: Peroxy Radicals (molecules / cm^3)

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 in ppbv

NO

Nitric Oxide measured using NO/O3 Chemiluminescence.
Time: 1 Hz data aligned to AOCTimewave
Reported parameter names and units:
NO_ppbv: NO in 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 in 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 in ppbv
NOy_1sigma: 1 sigma uncertainty

NH3

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

NO3N2O5

NO3, N2O5, NO2 measured using Cavity Ring-Down Spectroscopy (CRDS).
Time: 1 Hz data aligned to AOCTimewave
Reported parameter names and units:
NO3_pptv: NO3 pptv
N2O5_pptv:N2O5 in pptv
NO2_CaRDS_ppbv NO2 in ppbv:

O3

Ozone measured using NO/O3 Chemiluminescence.
Time: 1 Hz data aligned to AOCTimewave
Reported parameter names and units:
O3_ppbv: O3 in ppbv
O3_1sigma: 1 sigma uncertainty

PANs

PAN, PPN, etc. measured using Chemical Ionization Mass Spectrometer (CIMS).
Time: 1 Hz data aligned to AOCTimewave
Reported parameter names and units:
PAN_pptv: PAN in pptv
PPN_pptv: PPN in pptv
PBN_pptv: PBN in pptv
MPAN_pptv: MPAN in pptv
APAN_pptv: APAN in pptv
MOPN_pptv: MOPN in pptv
PBzN_pptv: PBzN in ppbv

SO2

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

VOCsPTRMS

Volatile organic compounds 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:
acetaldehyde, acetic_acid, acetone, acetonitrile, benzene, C8_aromatics, C9_aromatics, DMS, isoprene, MEK, MVK_MACR, methanol, monoterpenes, toluene: all in units of pptv

Volatile organic compounds (VOCs) using WAS

Time: Aligned to WAS_TimeMid_UTC WAS_TimeStart_UTC WAS_TimeEnd_UTC
VOCs measured using Whole Air sampling technique.
Reported parameter names and units:
Too many to list (about 100)

Aerosols

AMS

Aerosol Bulk Composition using Aerosol Mass Spectrometer.
Time: 10 second data reported using AOCTimewave
Reported parameter names and units:
AMS_Org: Organics in micrograms per standard cubic meter of air
AMS_SO4: SO4 in micrograms per standard cubic meter of air
AMS_NH4: NH4 in micrograms per standard cubic meter of air
AMS_NO3: NO3 in micrograms per standard cubic meter of air

PILSAnion

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

PILSCation

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

PILSWSOC

Aerosol bulk ionic composition water soluable organic carbon aerosol data measured using Particle Into Liquid Sampling (PILS).
Time: Reported on WSOC_Start_UTC, WSOC_Mid_UTC, WSOC_End_UTC time
Reported parameter names and units:
WSOC_ug_C_m3: Water soluable organic carbon in units of micrograms per cubic meter

CCN

Cloud Condensation Nuclei 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 in #/cm3
Supersaturation: in %

CRDExt

Time: 1Hz data reported on AOCTimewave
Aerosol optical properties all at sub 1 micron aerodynamic diameter measured using Cavity ring-down spectrometer.
Reported parameter names and units:
Ext532_stp: Aerosol Extinction Coefficient at 532 nm at 10% RH at STP (Mm-1)
Ext1064_stp: Aerosol Extinction Coefficient at 1064 nm at 10% RH at STP (Mm-1)
Abs530_stp: Aerosol Absorption coefficient at 530nm at 10% RH at STP (Mm-1)
AngAbs: Angstrom Exponent of Absorption, 467nm/660nm at 10% RH (unitless)
Gamma_532: Parameterization of Extinction Dependence on RH (fRH) (unitless)
Ext532_0RH_stp: Extrapolated Aerosol Extinction Coefficient at 0% RH at 532 nm at STP (Mm-1)
fRH80_30: Extinction Dependence on RH (ratio of extinction at 80% and 30% RH) (unitless)
fRH30_0: Extinction Dependence on RH (ratio of extinction at 30% and 0% RH) (unitless)
AngExt: Angstrom Exponent of Extinction, 532nm/1064nm at 10% RH (unitless)
RH: Ambient Relative Humidity (%)
fRHScatAmbRef: Calculated Scattering Dependence on RH (ratio of scattering at ambient and 10% RH) (unitless)
fRHExtAmb_0: Extinction Dependence on RH (ratio of extinction at ambient and 0% RH) (unitless)
Albedo532Amb: Single scattering albedo at 532 nm at ambient RH (unitless)
ExtAmb: Aerosol Extinction Coefficient at 532 nm extrapolated at ambient RH (Mm-1)
Scat532_stp: Scattering Coefficient at 532 nm at 10% STP (Mm-1)
Albedo532_refRH: Single scattering albedo at 532 nm at 10% RH (unitless)

NAerosol

Aerosol Size, Number, Surface, Volume: Aerosol sizing instruments: 5-chan CPC, ultra-high sensitivity aerosol size spectrometer, white-light OPC.
Time: 1Hz data reported on AOCTimewave
Reported parameter names and units:
nfine: number of particles in fine mode -> 0.004 to 0.7 um physical diameter (#/cm^3)
sfine: particle surface area in fine mode -> 0.004 to 0.7 um physical diameter (um^2/cm^3)
vfine: particle volume in fine mode -> 0.004 to 0.7 um physical diameter (um^3/cm^3)
ncoarse: number of particles in coarse mode -> 0.7 to 8.3 um physical diameter (#/cm^3)
scoarse: particle surface area in coarse mode -> 0.7 to 8.3 um physical diameter (um^2/cm^3)
vcoarse: particle volume in coarse mode -> 0.7 to 8.3 um physical diameter (um^3/cm^3)

SP2

Time: 1 sec and 10 sec data reported on AOCTimewave
NOAA Single-Particle Soot Photometer (SP2).
Reported parameter names and units:
BC_ng_kg: 1 sec black carbon in ng/kg
BC_ng_m3: 1 sec black carbon in ng/m3
BC_ng_kg_10s: 10 sec black carbon in ng/kg
BC_ng_m3_10s: 10 sec black carbon in ng/kg

Radiation

jNO3CSD

Actinic Flux (NOAA CSD Actinic Flux Spectral Radiometer)
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
Upward-looking, Downward-looking and Combined (sum of Up and Down) J values for individual NO3 photolysis rates for NO or NO2 production

jValCSD

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
Upward-looking, Downward-looking and Combined (sum of Up and Down) J values for 18 reactions