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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.
AMS: AMS_Start_Time / AMS_End_Time (10 minute averages)
NH3: AOCTime_NH3start / AOCTime_NH3stop / AOCTime_NH3mid (5 second averages)
PILSAnion: Anion_start_UTC / Anion_end_UTC (60 second samples)
PILSWSOC: WSOC_start_UTC / WSOC_end_UTC (3 second averages)
VOCsWAS: On_Time / Mid_Time / Off_Time (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
AmbTemp: Ambient Temperature (C)
DewPtTemp: Dew Point Temperature (C) measured by chilled mirror hygrometer.
EquivPotTemp: Equivalent Potential Temperature (K)
H2Omr: H2O mixing ratio (g/kg)
LymanAlphaRaw: Raw output from Lyman Alpha (arbitrary)
PotTemp: Potential Temperature (K)
RelHumidity: Relative Humidity (%)
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)
DynPrs: Dynamic 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)
VertSpdGnd: Vertical Ground Speed (m/s)

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

GITCIMS

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

H2CO

Formaldehyde measured by tunable diode laser absorption spectrometry.
Time: 60 sec averages aligned to AOCTimewave
Reported parameter names and units:
H2CO_ppbv: H2CO in ppbv
HCOOH_ppbv: HCOOH in ppbv

HNO3

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

NH3

Ammonia measured using Chemical Ionization Mass Spectrometer (CIMS).
Time: 5 second averages aligned reported using AOCTime_NH3start, AOCTime_NH3stop, AOCTime_NH3mid
Reported parameter names and units:
NH3_ppbv: NH3 in ppbv
NH3_error: total uncertainty

NO3N2O5

NO3 and N2O5 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

NOy

Nitrogen compounds measured using NO/O3 chemiluminescence.
Time: 1 Hz data aligned to AOCTimewave
Reported parameter names and units:
NO_ppbv: NO in ppbv
NO2_ppbv: NO2 in ppbv
NOy_ppbv: NOy in ppbv
Sum_NOy_ppbv: NO+NO2+HNO3+ all measured PANs in ppbv

O3

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

PANs

PANs measured using Chemical Ionization Mass Spectrometer (CIMS).
Time: 1 Hz data aligned to AOCTimewave
Reported parameter names and units:
PAN: Peroxy Acetyl Nitrate (CH3C(O)OONO2)
PPN: Peroxy Propionyl Nitrate (C2H5C(O)OONO2)
PBN: Sum of PiBN & PnBn; sum of Peroxy isoButyryl Nitrate & Peroxy Butyryl Nitrate; ((CH3)2CHC(O)OONO2) & (CH3CH2CH2C(O)OONO2)
APAN: Peroxy Acryloyl Nitrate (CH2=CHC(O)OONO2)
MoPAN: Peroxy Methoxyformyl Nitrate (CH3OC(O)OONO2)
PBzN: Peroxy Benzoyl Nitrate (C6H5C(O)OONO2)
MPAN: Peroxy Methacryloyl Nitrate (CH2=C(CH3)C(O)OONO2)
PPeN: Peroxy Pentyryl Nitrate (CH3CH2CH2CH2C(O)OONo2)

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

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, Acetic_acid, DMS, Isoprene, MVK_MACR, MEK, Benzene, Toluene, C8_aromatics, C9_aromatics, Monoterpenes: All in units of pptv

VOCsWAS

VOCs measured using Whole Air Sampling technique.
Time: Aligned to On_Time, Mid_Time, Off_Time (variable time intervals)
Reported parameter names and units:
Too many to list (about 70)

Aerosols

AMS

Aerosol Bulk Composition using Aerosol Mass Spectrometer (AMS).
Time: 10 minute averages reported on AMS_Start_Time, AMS_End_Time
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

CloudProbes

Cloud droplet physical properties measured using NOAA WP-3D OAP 2d-C & FSSP-100 Cloud Microphysics Measurements.
Time: 1Hz data reported on AOCTimewave
Reported parameter names and units:
CloudNTot: Total number concentration, cloud mode only (#/cc)
CloudLWC: Liquid water content, cloud mode only (g/m3)
LWCTot: Liquid water content, cloud and precipitation mode (g/m3)
CloudSA: Surface Area Density, cloud mode only (um2/cm3)
SATot: Surface Area Density, cloud and precipitation (um2/cm3)
ReffTot: Effective radius, cloud and precipitation mode (um)
CloudNGT30: Concentration of coalescence size drops >30 um diameter, cloud mode only (#/cm3)
PrecipRR: Equivalent Liquid Water Rainfall Rate, precipitation mode only (mm/h)

NAerosol

NOAA Aerosol Size, Number, Surface, Volume Distribution. Aerosol sizing instruments: 5-chan CPC, Lasair, and white-light OPC.
Time: 1Hz data reported on AOCTimewave
Reported parameter names and units:
nfine: number of particles in fine mode -> 0.004 to 1.0 um diameter (#/cm^3)
sfine: particle surface area in fine mode -> 0.004 to 1.0 um diameter (um^2/cm^3)
vfine: particle volume in fine mode -> 0.004 to 1.0 um diameter (um^3/cm^3)
ncoarse: number of particles in coarse mode -> 1.0 to 8 um diameter (#/cm^3)
scoarse: particle surface area in coarse mode -> 1.0 to 8 um diameter (um^2/cm^3)
vcoarse: particle volume in coarse mode -> 1.0 to 8 um diameter (um^3/cm^3)

PILSIC

Aerosol Aerosol Bulk Ionic Composition measured using Particle Into Liquid Sampling (PILS).
Time: Reported on PILS_start_time, PILS_end_time
Reported parameter names and units:
Ammonium, Calcium, Chloride, Magnesium, Nitrate, Potassium, Sodium, Sulfate: All reported in units of mg/cc

PILSWSOC

Water Soluble Organic Carbon aerosol data measured using Particle Into Liquid Sampling (PILS)
Time: Reported on WSOC_mid_time
Reported parameter names and units:
WSOC_ugC_m_3: Water soluable organic carbon in units of mg/cc

Radiation

jNO3AL

Actinic Flux NOAA Spectrometer
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 (U), Downward-looking (D) and Combined (sum of Up and Down) photolysis rate for NO3

jValAL

Actinic Flux NOAA Spectrometer
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 (U), Downward-looking (D) and Combined (sum of Up and Down) photolysis rates for 18 species

SSFRN

Spectral Irradiance from WP3 SSFR Instrument
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 flux at different wavelengths

SSFRZ

Spectral Irradiance from WP3 SSFR Instrument
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
Down-welling flux at different wavelengths