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Electra 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 Electra data is time-aligned to RAFTimewave, 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.
VOCsGCMS: StartTime_GCMS / StopTime_GCMS
VOCsWAS: TimeOpen_WAS / TimeHalf_WAS / TimeClose_WAS (variable intervals)

Aircraft parameters

AircraftPos

Aircraft Position parameters measured with various aircraft sensors.
Time: 1 Hz data aligned to RAFTimewave
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 RAFTimewave
AmbTemp: Ambient Temperature (C)
DewPtTemp: Dew Point Temperature (C) measured by chilled mirror hygrometer.
EquivPotTemp: Equivalent Potential Temperature (K)
H2Omr: H2O mixing ratio derived from dew point (g/kg)
H2OmrLyman: H2O mixing ratio from Lyman alpha instrument(g/kg)
LiqH2O: Liquid H2O (g/m3)
PotTemp: Potential Temperature (K)
RelHumidity: Relative Humidity (%)
StaticPrs: Static Pressure (mb)
VertWindSpd: Vertical Wind Speed (m/s)
WindDir: Wind Direction (deg)
WindEast: Wind Speed East-West (m/s)
WindNorth: Wind Speed North-South (m/s)
WindSpd: Wind Speed (m/s)

AircraftMis

Aircraft Miscellaneous parameters measured with various aircraft sensors.
Time: 1 Hz data aligned to RAFTimewave
Reported parameter names and units:
Attack: Attack Angle (deg)
CabinPrs: Cabin Pressure (mbar)
GndSpd: Ground Speed (m/s)
Pitch: Pitch Angle (deg)
Roll: Roll Angle (deg)
irIrradDown: Downward-looking IR Irradiance (W/m2)
irIrradUp: Upward-looking IR Irradiance (W/m2)

Chemical Species

CH2O

Formaldehyde measured using NCAR TDLAS.
Time: 1 second and 10 second data aligned to CH2O_StartTime/CH2O_StopTime
Reported parameter names and units:
CH2O_ppbv: CH2O in ppbv

CO

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

CO2

Carbon Dioxide measured using NDIR technique.
Time: 1 Hz data aligned to RAFTimewave
Reported parameter names and units:
CO2_ppmv: CO2 in ppmv

HNO3

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

NOy

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

O3

Ozone measured using chemiluminescence.
Time: 1 Hz data aligned to RAFTimewave
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 RAFTimewave
Reported parameter names and units:
APAN: APAN in pptv
MPAN: Peroxy Methacryloyl Nitrate (CH2=C(CH3)C(O)OONO2) in pptv
PAN: Peroxy Acetyl Nitrate (CH3C(O)OONO2) in pptv
PiBN: PiBN in pptv
PPN: Peroxy Propionyl Nitrate (C2H5C(O)OONO2) in pptv

SO2

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

VOCsGCMS

VOCs measured using Gas Chromatograph / Mass Spectrometer (GCMS).
Time: Reported using StartTime_GCMS / StopTime_GCMS.
Reported parameter names and units:
Too many to list

VOCsPTRMS

VOCs measured using Proton Transfer Reaction Mass Spectrometer (PTRMS).
Time: Reported about every 15 seconds on RAFTimewave, but actual times vary. Contact PI for details.
Reported parameter names and units:
Acetaldehyde, Acetone_Propanal, Acetonitrile, Isoprene, Methanol, MVK_MACR, PAN, Toluene: All in units of ppbv

VOCsWAS

VOCs measured using Whole Air Sampling technique.
Time: Aligned to TimeOpen_WAS, TimeHalf_WAS, TimeClose_WAS
Reported parameter names and units:
Too many to list (about 70)

Aerosols

NAerosol

Aerosol Size, Number, Surface, Volume Distribution (NOAA Aerosol).
Time: 1Hz data reported on RAFTimewave
Reported parameter names and units:
nlt20: particle number concentration, 4 to <20 nm (#/cm^3)
n20to100: particle number concentration, >=20 to <100 nm (#/cm^3)
n100to1000: particle number concentration, >=100 to <1000 nm (#/cm^3)
ngt1000: particle number concentration, >=1000 to <8500 nm (#/cm^3)
ntot: particle number concentration, 4 to <8500 nm (#/cm^3)
slt20: particle surface area, 4 to <20 nm (um^2/cm^3)
s20to100: particle surface area, >=20 to <100 nm (um^2/cm^3)
s100to1000: particle surface area, >=100 to <1000 nm (um^2/cm^3)
sgt1000: particle surface area, >=1000 to <8500 nm (um^2/cm^3)
stot: particle surface area, 4 to <8500 nm (um^2/cm^3)
vlt20: particle volume, 4 to <20 nm (um^3/cm^3)
v20to100: particle volume, >=20 to <100 nm (um^3/cm^3)
v100to1000: particle volume, >=100 to <1000 nm (um^3/cm^3)
vgt1000: particle volume, >=1000 to <8500 nm (um^3/cm^3)
vtot: particle volume, 4 to <8500 nm (um^3/cm^3)

Radiation

jNO2

Actinic Flux NOAA Spectrometer
Time: 1 Hz data reported on RAFTimewave
NO2 Photolysis rate (J-Value).
Reported parameter names and units:
Units in sec^(-1)
Combined (sum of Up and Down) J values for NO2

jValCSD

Actinic Flux NOAA Spectrometer
Time: 1 Hz data reported on RAFTimewave
Photolysis rates (J-Values).
Reported parameter names and units:
All units in sec^(-1)
Upward-looking, Downward-looking and Combined (sum of Up and Down) J values for 18 reactions