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ICEALOT 2008 Knorr Data Info

| Time Parameters | Ship 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: Most of the Knorr data is time-aligned to Start_UTC, which is 1 minute time resolution in integer seconds. The file that isn't aligned to Start_UTC is VOCSsGCMS, which uses GC_Start_UTC / GC_Stop_UTC: 5 minute measurement every half hour.

Ship Parameters

AmbRH

Relative Humidity measured via a Humicap 180 capacitance sensor.
Time: 1 Minute averages aligned to Start_UTC.
Reported parameter names and units:
RH_Pct: Ambient Relative Humidity (%)
RH_Pct_err: Total Uncertainty in Ambient Relative Humidity

AmbTemp

Temperature measured via Vaisala HMP45A temperature/relative humidity probe.
Time: 1 Minute averages aligned to Start_UTC.
Reported parameter names and units:
Temp_C: Ambient Temperature (C)
Temp_C_err: Total Uncertainty in Temperature

AtmPress

Pressure measured via Vaisala barometer, Model CS105.
Time: 1 Minute averages aligned to Start_UTC.
Reported parameter names and units:
P_mbar: Atmospheric pressure (mbar)

ShipMet

Ship Meteorological Parameters measured with various sensors.
Time: 1 Minute averages aligned to Start_UTC.
Reported parameter names and units:
AirTemp_degC: Air Temperature (C)
BaroP_mbar: Barometric Pressure (mbar)
RH_percent: Relative Humidity (%)
SZA_deg: Solar Zenith Angle (deg)
WindD_deg: Wind Direction (deg)
WindS_m_s: Wind Speed (m/s)

ShipMis

Ship Miscellaneous Parameters measured with various sensors.
Time: 1 Minute averages aligned to Start_UTC.
Reported parameter names and units:
RelWindDir: Relative Wind Direction (deg)
RelWindSpd: Relative Wind Speed (m/s)
ShipCourse_degrees: Ship Coarse (deg)
ShipSpd_knts: Ship Speed (knots)
SST_DegC: Sea Surface Temperature (C)

ShipPos

Ship Position Parameters measured by GPS.
Time: 1 Minute averages aligned to Start_UTC.
Reported parameter names and units:
Lat_deg: GPS Latitude (deg)
Lon_deg: GPS Longitude (deg)

Wind

Ship Wind Parameters measured by various ship sensors.
Time: 1 Minute averages aligned to Start_UTC.
Reported parameter names and units:
Rel_WD_deg: Relative Wind Direction (deg)
Rel_WD_deg_unc: Uncertainty in Relative Wind Direction (deg)
True_WD_deg: True Wind Direction (deg)
True_WD_deg_unc: Uncertainty in True Wind Direction (deg)
Rel_WS_m_s: Relative Wind Speed (m/s)
Rel_WS_m_s_unc: Uncertainty in Relative Wind Speed (m/s)
True_WS_m_s: True Wind Speed (m/s)
True_WS_m_s_unc: Uncertainty in True Wind Speed (m/s)

Chemical Species

CO

Carbon monoxide measured using Nondispersive IR using AeroLaser AL-5002 fast-response instrument.
Time: 1 Minute averages aligned to Start_UTC.
Reported parameter names and units:
CO_ppbv: Carbon Monoxide (ppbv)

CO2

Carbon dioxide measured using Nondispersive IR using LI-COR LI-7000 CO2/H2O gas analyzer.
Time: 1 Minute averages aligned to Start_UTC.
Reported parameter names and units:
CO2_ppmv: Carbon Dioxide (ppmv)
CO2_ppmv_unc: Carbon Dioxide Uncertainty (ppmv)

H2O

Water vapor calculated from ambient temperature, then multiplied by relative humidity to find ambient water vapor pressure.
Time: 1 Minute averages aligned to Start_UTC.
Reported parameter names and units:
H2O_ppth: Water (ppth)
H2O_ppth_err: Water Uncertainty (ppth)

N2O5

Dinitrogen Pentoxide measured using Cavity ring-down spectrometer.
Time: 1 Minute averages aligned to Start_UTC.
Reported parameter names and units:
N2O5_pptv: N2O5 (pptv)

NO3

Nitrogen Trioxide measured using Cavity ring-down spectrometer.
Time: 1 Minute averages aligned to Start_UTC.
Reported parameter names and units:
NO3_pptv: NO3 (pptv)
NO3_pptv_1sig: NO3 1 sigma standard deviation (pptv)

NOx

Reactive Nitrogen measured using Cavity ring-down spectrometer.
Time: 1 Minute averages aligned to Start_UTC.
Reported parameter names and units:
NO_ppbv: NO (ppbv)
NO_ppbv_unc: NO Uncertainty (ppbv)
NO2_ppbv: NO2 (ppbv)
NO2_ppbv: NO2 Uncertainty (ppbv)
NOx_ppbv: NOx (ppbv)
NOx_ppbv: NOx Uncertainty (ppbv)

NOy

Total reactive Nitrogen Oxides measured using Au Converter and NO/O3 Chemiluminescence.
Time: 1 Minute averages aligned to Start_UTC.
Reported parameter names and units:
NOy_ppb: NOy (ppb)

O3cl

Ozone measured using Chemiluminescence.
Time: 1 Minute averages aligned to Start_UTC.
Reported parameter names and units:
O3cl_ppb: O3 (ppb)

O3uv

Ozone measured via UV absorbance (Thermo Environmental model 49c)
Time: 1 Minute averages aligned to Start_UTC.
Reported parameter names and units:
O3uv_ppb: O3 (ppb)

PANs

Peroxyacyl Nitrates measured using GC/ECD.
Time: 1 Minute averages aligned to Start_UTC.
Reported parameter names and units:
PAN_ppbv: PAN (ppbv)
PPN_ppbv: PPN (ppbv)
MPAN_ppbv: MPAN (ppbv)

SO2

Sulfur Dioxide measured using UV Pulsed Fluorescence (TECO Model 43s)
Time: 1 Minute averages aligned to Start_UTC.
Reported parameter names and units:
SO2_ppb: SO2 (ppb)

VOCsGCMS

Volitile organic compounds (VOCs) measured using gas chromatograph/mass spectrometer.
Time: Averages using GC_Start_UTC/GC_Stop_UTC.
Reported parameter names and units:
Too many to list.

Aerosols

ExtCRD

Aerosol light extinction measured using Cavity Ring-Down Aerosol Extinction Spectrometer.
Time: 1 Minute averages aligned to Start_UTC.
Reported parameter names and units:
ext_532_sub1_80RH: Aerosol Extinction Coefficient at 532 nm at 80% RH, sub-1 micron (Mm-1)
ext_532_sub10_80RH: Aerosol Extinction Coefficient at 532 nm at 80% RH, sub-10 micron (Mm-1)
ext_532_sub1_20RH: Aerosol Extinction Coefficient at 532 nm at 20% RH, sub-1 micron (Mm-1)
ext_532_sub10_20RH: Aerosol Extinction Coefficient at 532 nm at 20% RH, sub-10 micron (Mm-1)
ext_1064_sub1_10RH: Aerosol Extinction Coefficient at 1064 nm at 10% RH, sub-1 micron (Mm-1)
ext_1064_sub1_80RH: Aerosol Extinction Coefficient at 1064 nm at 80% RH, sub-1 micron (Mm-1)
ext_1064_sub10_10RH: Aerosol Extinction Coefficient at 1064 nm at 10% RH, sub-10 micron (Mm-1)
ext_1064_sub10_80RH: Aerosol Extinction Coefficient at 1064 nm at 80% RH, sub-10 micron (Mm-1)
ext_355_sub1_10RH: Aerosol Extinction Coefficient at 355 nm at 10% RH, sub-1 micron (Mm-1)
ext_355_sub1_80RH: Aerosol Extinction Coefficient at 355 nm at 80% RH, sub-1 micron (Mm-1)
ext_355_sub10_10RH: Aerosol Extinction Coefficient at 355 nm at 10% RH, sub-10 micron (Mm-1)
ext_355_sub10_80RH: Aerosol Extinction Coefficient at 355 nm at 80% RH, sub-10 micron (Mm-1)

Radiation

jDerived

Calculated down-welling photolysis rates (j values) from filter radiometers.
Time: 1 Minute averages aligned to Start_UTC.
Reported parameter names and units:
jCH3COCH3_Hz: j CH3COCH3 (Hz)
jHCHO_Hz: j HCHO (Hz)
jCH3CHO_Hz: j CH3CHO (Hz)
jCH3OOH_Hz: j CH3OOH (Hz)
jH2O2_Hz: j H2O2 (Hz)
jHONO_Hz: j HONO (Hz)
jHNO3_Hz: j HNO3 (Hz)
jPAN_Hz: j PAN (Hz)
jCl2_Hz: j Cl2 (Hz)
jClNO2_Hz: j Cl2 (Hz)
jBrO_Hz: j BrO (Hz)

jNO2

Calculated down-welling photolysis rate (j value) for NO2 from filter radiometers.
Time: 1 Minute averages aligned to Start_UTC.
Reported parameter names and units:
jNO2_Hz: j NO2 (Hz)

jNO3

Calculated down-welling photolysis rate (j value) for NO3 from filter radiometers.
Time: 1 Minute averages aligned to Start_UTC.
Reported parameter names and units:
jNO3_Hz: j NO3 (Hz)

jO3

Calculated down-welling photolysis rate (j value) for O3 from filter radiometers.
Time: 1 Minute averages aligned to Start_UTC.
Reported parameter names and units:
jO3_Hz: j O3 (Hz)