Meteorological, oceanographic and ship data collected on board icebreaker Oden during the Arctic Ocean expedition 2016
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These data were collected onboard the icebreaker Oden during the Arctic Ocean expedition 2016 and are published by the Swedish Polar Research Secretariat. 
The data have been processed/modified for the purpose of basic quality control. Users should be aware of this in further data handling and analysis.
For further information on the specific research expedition see the metadata record or visit www.polarforskningsportalen.se.
For further information on the data, data collection, sensors, limitations or errors contact the data provider: datamanager@polar.se  
www.polar.se
Data are released on a Creative Commons by Attribution License 3.0 

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Files and naming convention:
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AO16.txt - Main file containing data as described below.
AO16_overview.txt - File containing an hourly data excerpt from the full data file above.
AO16_depth.txt  File contains water depth. (Different time resolution compared to main file)
AO16_cloud.txt  Cloud height data as described below. (Different time resolution compared to main file)
AO16_route.shp  Shape file of Arctic Ocean 2016 expedition route
AO16_route.kml  Google Earth file of Arctic Ocean 2016 expedition route

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NA indicates no reading or missing data.

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File content
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AO16.txt & AO16_overview.txt
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Timestamp - Date and time for data collection in UTC0.
Heading  () Ship heading from ship gyro.
COG  () ship course over ground from ship GPS.
SOG  (knots) Ship speed over ground from ship GPS.
Long - () Longitude (ship position) in decimal degrees WGS84 from ship GPS.
Lat - () Latitude (ship position) in decimal degrees WGS84 from ship GPS.
WindDirTrue  () True wind direction (calculated).
WindSpeedTrue  (m/s) True wind speed (calculated).
WindDirRel  () Relative (as experienced on moving ship) wind direction. Measured at tower mounted on bridge roof.
WindSpeedRel  (m/s) Relative (as experienced on moving ship) wind speed (measured). Measured at tower mounted on bridge roof.
Tempport  (C) Air temperature from sensor on port bow side of ship bridge. Vaisala HMP155.
Tempstbd  (C) Air temperature from sensor on starboard side of ship bridge. Vaisala HMP155.
Humport  (%) Relative humidity from sensor on port bow side of ship bridge. Vaisala HMP155.
Humstbd  (%) Relative humidity from sensor on starboard side of ship bridge. Vaisala HMP155.
Temperature - (C) Air temperature: lowest of Tempstbd and Temport.
Humidity - (%) Relative humidity: lowest of humstbd and humport.
Pressure  (mbar) Atmospheric pressure at height of ships bridge.
Trend - (mbar/hour) Pressure trend over the last three hours.
PAR - (mol m^-2 s^-1) Insolation, Photosynthetic Active Radiation (400-700nm). The data are mean values of multiple measurements and are calibrated according to the manual for Biosphericalinstrument QSR21-50. 
Tempsea - () Sea water temperature measured as temperature of the metal pipe at Odens sea water inlet using PT100 sensor.
Templab - () Temperature of sea water in laboratory onboard Oden (water has travelled in pipes from sea water inlet and consequently warmed - compare Tempsea).
Conductivitylab - (S/m) Conductivity of sea water from sea water intake in laboratory onboard Oden. Seabird SBE 38.
Salinitylab - (psu) Salinity of sea water from sea water intake in laboratory onboard Oden. Seabird SBE 38.
Soundvelocitylab - (m/s) Velocity of sound in sea water from sea water intake in laboratory onboard Oden. Seabird SBE 38.

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AO16_depth.txt
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Timestamp  Date and time for data collection in UTC0.
Depth  (m) water depth from ship echo sounder.
Long - () Longitude (ship position) in decimal degrees WGS84. Calculated from ship position according to main file (the files differ in time resolution)
Lat - () Latitude (ship position) in decimal degrees WGS84. Calculated from ship position according to main file (the files differ in time resolution)

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AO16_cloud.txt
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Instrument: CEILOMETER CBME80; Bjrn Eliasson Ingenjrsfirma AB

Timestamp - Date and time for data collection in UTC0.
VV - (feet) Vertical visibility. [-40] = No reading.
CA1_B  (feet) Altitude of first cloud level. [-40] = No reading.
CA1_E  (feet) First cloud level amount in octaves. [9] = Instead of cloud  altitude, visibility is reported in CA1_B.
CA2_B  (feet) Altitude of second cloud level. [-40] = No reading.
CA2_E  Corresponding to CA1_E.
CA3_B  (feet) Altitude of third cloud level. [-40] = No reading.
CA3_E  Corresponding to CA1_E.
CA4_B  (feet) Altitude of forth cloud level. [-40] = No reading.
CA4_E  Corresponding to CA1_E.
Long - () Longitude (ship position) in decimal degrees WGS84. Calculated from ship position according to main file (the files differ in time resolution)
Lat - () Latitude (ship position) in decimal degrees WGS84. Calculated from ship position according to main file (the files differ in time resolution)

