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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. 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 CalNex.
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)

SZA

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

Chemical Parameters

CO

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

CO2

Carbon Dioxide measured using measures by absorption of infrared light (LICOR instrument).
Time: 1 Hz data aligned to AOCTimewave
Reported parameter names and units:
CO2_ppmv:CO2 (ppmv)
CO2_ppmv_1sigma: 1 sigma uncertainty

FlaskGG

Greenhouse gases measured using Global Monitoring Division whole-air sampling flasks.
Time: Data aligned to GMDflask_opentime / GMDflask_closetime corresponding to open / close times of flasks.
Reported parameter names and units:
CO2 in units of ppmv, SF6 in units of pptv, CH4, CO, H2, N2O all in units of ppbv.

FlaskHaloC

Halocarbons measured using Global Monitoring Division whole-air sampling flasks.
Time: Data aligned to GMDflask_opentime / GMDflask_closetime corresponding to open / close times of flasks.
Reported parameter names and units:
HFC134a, HCFC22, CFC12, CH3Cl, HCFC142b, H1211, CH3Br, CFC11, HCFC141b, CH3I, CFC113, CH2Cl2, CHCl3, CH3CCl3, CCl4, CH2Br2, C2Cl4, CHBr3, COS, HFC152a, CS2, H1301, H2402 all in units of pptv.

FlaskHydroC

Hydrocarbons measured using Global Monitoring Division whole-air sampling flasks.
Time: Data aligned to GMDflask_opentime / GMDflask_closetime corresponding to open / close times of flasks.
Reported parameter names and units:
C2H2, C3H8, iC5H12, nC5H12, C6H6, nC4H10 all in units of pptv.

HalogenCIMS

Chemical Ionization Mass Spectrometer using I- as reagent ion
Time: 1 Hz data aligned to AOCTimewave
Reported parameter names and units:
HOBr_Br2_pptv_HalogenCIMS, BrO_pptv_HalogenCIMS, BrCl_pptv_HalogenCIMS all in units of pptv.

NO

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

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)

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)

O3

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

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

Sulfer dioxide measured using pulsed UV fluorescence.
Time: 1 Hz data aligned to AOCTimewave
Reported parameter names and units:
SO2_ppbv SO2 (ppbv)

SO2CIMS

Sulfur Dioxide measured using Chemical Ionization Mass Spectrometry (CIMS) using SF6– as reagent ion.
Time: 1 Hz data aligned to AOCTimewave
Reported parameter names and units:
SO2_ppbv_SO2CIMS: SO2 (ppbv) measured by CIMS
HNO3_ppbv_SO2CIMS: HNO3 (ppbv) measured by CIMS

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, acetone, acetic_acid, isoprene, MVK_MACR, MEK, benzene, toluene, C8_aromatics, C9_aromatics, monoterpenes: all in units of pptv

Aerosol Parameters

AeroCoarse

Coarse (0.75-8.9 um Diam) number, surface area, volume (NOAA Aerosol)
Time: 30 sec average data reported on TimeStart / TimeStop
Aerosol sizing instruments: 5-chan CPC, ultra-high sensitivity aerosol size spectrometer, white-light OPC.
Reported parameter names and units:
ncoarse: coarse mode particle number concentration (#/cm^3)
scoarse: coarse mode particle surface area (um^2/cm^3)
vcoarse: coarse mode particle volume (um^3/cm^3)

AeroFine

Fine 0.004 to 1.0 um aero. diam (~0.75 um physical diam.) number, surface area, volume (NOAA Aerosol)
Time: 1 Hz data aligned to AOCTimewave
Aerosol sizing instruments: 5-chan CPC, ultra-high sensitivity aerosol size spectrometer, white-light OPC.
Reported parameter names and units:
nfine: fine mode particle number concentration, (#/cm^3)
sfine: fine mode particle surface area (um^2/cm^3)
vfine: fine mode particle volume (um^3/cm^3)

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)

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: (%)

CloudProbes

Cloud droplet physical properties determined using optical measurements as measured by Droplet Measurement Technology's cloud probes.
Time: 1Hz data reported on AOCTimewave
Reported parameter names and units:
CDP_Num: Particle concentration from Cloud Droplet Probe (# / cc)
CIP_Num: Particle concentration from Cloud Imaging Probe (# / cc)
PIP_Num: Particle concentration from Precipitation Imaging Probe (# / cc)
Droplet_Flag: Indicates > 1 particle per cubic cm with diameter 3-50 um measured with the CDP.
Precip_Flag: Indicates > 0.1 particles per liter with diameter 50-6200 um measured with the CIP and PIP.

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:
ExtGreen: 532 nm aerosol extinction coefficient (Mm-1 at RH < 5%, STP)
ExtIR: 1064 nm aerosol extinction coefficient (Mm-1 at RH < 5%, STP)
ExtGamma: Gamma parameter describing RH dependence of extinction (unitless)
AngstromExtinction: Angstrom exponent describing wavelength dependence of extinction (unitless)
ScatGreen: Scattering at 532 nm (Mm-1)
AlbedoGreen: Albedo at 532 nm (unitless)
AbsGreen: Absorption at 532 nm (Mm-1)
AngstromAbsorption:
AbsGreenLo: Lower limit of uncertainty, albedo at 532 nm (unitless)
AbsGreenHi: Upper limit of uncertainty, albedo at 532 nm (unitless)
ScatGreenLo: Lower limit of uncertainty, scattering at 532 nm (Mm-1)
ScatGreenHi: Upper limit of uncertainty, scattering at 532 nm (Mm-1)
AlbedoGreenLo: Lower limit of uncertainty, albedo at 532 nm (unitless)
AlbedoGreenHi: Upper limit of uncertainty, albedo at 532 nm (unitless)

PALMS

Particle Analysis by Laser Mass Spectrometry
Time: data reported using PALMSstartTime PALMSstopTime
Measures chemical composition of individual small and ultra-small aerosol particles by laser desorption mass spectrometry.
Reported parameter names and units:
SeaSaltFrac: Number fraction of particles identified as sea salt (unitless)
MineralFrac: Number fraction of particles identified as minerals (unitless)
SootFrac: Number fraction of particles identified as soot (unitless)
BioBurnFrac: Number fraction of particles identified as signature of biomass burning (unitless)
SulfOrgFrac: Number fraction of particles identified as sulfates-organics (unitless)
SulfMF: Mass fraction of particles identified as sulfates (unitless)
OrgMF: Mass fraction of particles identified as organics (unitless)
SulfAcid: Sulfate acidity parameter (unitless)
ContamFlag: Fraction of particles showing contamination signatures from cloud particles impacting the inlet (unitless)
Npos: Number of particles used to calculate averages for this time period which were positive ions (unitless)
NNeg: Number of particles used to calculate averages for this time period which were negative ions (unitless)
NAcid: Number of particles used to calculate averages for this time period which were acids (unitless)

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
Upward-looking (U), Downward-looking (D) and Combined (sum of Upward-looking and Downward-looking) photolysis rates for many species

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
Upward-looking (U), Downward-looking (D) and Combined (sum of Upward-looking and Downward-looking) photolysis rates for many species

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:
DN375, Downward Shortwave Irradiance at 375.997 nm, W m^-2 nm^-1
DN500, Downward Shortwave Irradiance at 499.224 nm, W m^-2 nm^-1
DN634, Downward Shortwave Irradiance at 632.799 nm, W m^-2 nm^-1
DN936, Downward Shortwave Irradiance at 934.791 nm, W m^-2 nm^-1
DN_SW350_700, Downward Shortwave Broadband Irradiance 350.000-700.000 nm, W m^-2
DN_SW350_2150, Downward Shortwave Broadband Irradiance 350.000-2150.00 nm, W m^-2
DN_LW, Downward Longwave Broadband Irradiance 4.5-40 um, W m^-2
UP375, Upward Shortwave Irradiance at 375.997 nm, W m^-2 nm^-1
UP500, Upward Shortwave Irradiance at 499.224 nm, W m^-2 nm^-1
UP634, Upward Shortwave Irradiance at 632.799 nm, W m^-2 nm^-1
UP936, Upward Shortwave Irradiance at 934.791 nm, W m^-2 nm^-1
UP_SW350_700, Upward Shortwave Broadband Irradiance 350.000-700.000 nm, W m^-2
UP_SW350_2150, Upward Shortwave Broadband Irradiance 350.000-2150.00 nm, W m^-2
UP_LW, Upward Longwave Broadband Irradiance 4.5-40 um, W m^-2