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Title Sum-
Institution Dataset ID
   set  data   graph     files  Underway Surface Seawater and Marine Boundary Layer Observations Made from the Alaska Marine
Highway System M/V Columbia
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The Dataset's Variables and Attributes

Row Type Variable Name Attribute Name Data Type Value
attribute NC_GLOBAL cdm_data_type String Trajectory
attribute NC_GLOBAL cdm_trajectory_variables String vessel_id
attribute NC_GLOBAL contributor_contact String wiley.evans at hakai.org
attribute NC_GLOBAL contributor_name String Wiley Evans
attribute NC_GLOBAL contributor_role String Primary Investigator
attribute NC_GLOBAL Conventions String COARDS, CF-1.6, ACDD-1.3
attribute NC_GLOBAL date_created String 2017-10-25
attribute NC_GLOBAL Easternmost_Easting double -122.511
attribute NC_GLOBAL featureType String Trajectory
attribute NC_GLOBAL geospatial_lat_max double 59.4496
attribute NC_GLOBAL geospatial_lat_min double 48.6215
attribute NC_GLOBAL geospatial_lat_units String degrees_north
attribute NC_GLOBAL geospatial_lon_max double -122.511
attribute NC_GLOBAL geospatial_lon_min double -135.7158
attribute NC_GLOBAL geospatial_lon_units String degrees_east
attribute NC_GLOBAL geospatial_vertical_max String 2.0
attribute NC_GLOBAL geospatial_vertical_min String 2.0
attribute NC_GLOBAL infoUrl String https://www.hakai.org (external link)
attribute NC_GLOBAL institution String University of Alaska Southeast, Alaska Coastal Rainforest Center,University of Washington Joint Institute for the Study of the Atmosphere,Hakai Institute,Alaska Department of Transportation
attribute NC_GLOBAL instrument String Aanderaa 4330F Oxygen Optode,SBE 38 ,SBE 45,General Oceanics 8050 pCO2 Measuring System with LI-COR LI-840A
attribute NC_GLOBAL keywords String Alaska, Alaska Marine Highway, carbone, Comlumbia Ferry, conductivity, inorganicCarbon, oxygen, partial pressure, pco2, salinity, seaSurfaceSalinity, seaSurfaceTemperature, temperature
attribute NC_GLOBAL license String The data may be used and redistributed for free but is not intended
for legal use, since it may contain inaccuracies. Neither the data
Contributor, ERD, NOAA, nor the United States Government, nor any
of their employees or contractors, makes any warranty, express or
implied, including warranties of merchantability and fitness for a
particular purpose, or assumes any legal liability for the accuracy,
completeness, or usefulness, of this information.
attribute NC_GLOBAL Northernmost_Northing double 59.4496
attribute NC_GLOBAL platform String ship
attribute NC_GLOBAL platform_vocabulary String https://vocab.nerc.ac.uk/collection/L06/current/ (external link)
attribute NC_GLOBAL sourceUrl String (local files)
attribute NC_GLOBAL Southernmost_Northing double 48.6215
attribute NC_GLOBAL standard_name_vocabulary String CF Standard Name Table v79
attribute NC_GLOBAL subsetVariables String vessel_id,Type_code
attribute NC_GLOBAL summary String Between October 2017 and October 2019, underway surface water measurements were collected from the Alaska Marine Highway System M/V Columbia during 135 service route transits. The service route of the Columbia included the ports of Sitka, Juneau, Haines, Skagway, Wrangell, Petersburg, and Ketchikan in southeast Alaska, and between Ketchikan and Bellingham, WA. The vessel sailed south from Ketchikan every Wednesday, arrived in Bellingham on Friday, returned to Ketchikan on Sunday, and transited between southeast Alaska terminals between Sunday and Wednesday. Measurements of temperature, salinity, dissolved oxygen content, and CO2 partial pressure were made every 2 mins on seawater drawn into the vessel from a ~2 m intake. Seawater was delivered from the intake to analytical equipment on the car deck using a AMT 1/2 HP pump (4295-98). Temperature and salinity data were collected using a Sea-Bird SBE 45 MicroTSG Thermosalinograph, and intake temperature measured using a SBE 38 Digital Oceanographic Thermometer. Dissolved oxygen content was determined using an Aanderaa 4330F that had undergone multipoint calibration at the factory in Norway. CO2 measurements were made using a General Oceanics 8050 (GO8050) pCO2 Measuring System equipped with a LI-COR LI840A non-dispersive infrared detector. All data streams, including GPS information from an antenna and atmospheric pressure from a Vaisala barometer positioned on the foredeck, were captured by the GO8050 control computer. Atmospheric CO2 measurements were also made using the GO8050 on unaltered marine air drawn to the system through an intake located on the foredeck. The CO2 measurement scheme involved the analysis of four gas standards of known CO2 content (150 ppm, 349 ppm, 449 ppm, and 850 ppm; Praxair Distributions Inc), 12 analyses atmospheric CO2, and 240 seawater CO2 measurements in a 8.5 hour period. The atmospheric and seawater CO2 analyses were run in a sequence of 3 atmospheric measurements and 60 seawater measurements that was repeated 4 times between standardization. This project was supported by the Tula Foundation and Alaska Ocean Observing System, and was a collaborative effort between the Hakai Institute, University of Washington Joint Institute for the Study of the Atmosphere and Ocean/NOAA Pacific Marine Environmental Laboratory, State of Alaska Department of Transportation, University of Alaska Southeast Alaska Coastal Rainforest Center, and the Alaska Ocean Observing System.
attribute NC_GLOBAL time_coverage_end String 2019-10-02T22:49:00Z
attribute NC_GLOBAL time_coverage_start String 2017-10-25T19:30:00Z
attribute NC_GLOBAL title String Underway Surface Seawater and Marine Boundary Layer Observations Made from the Alaska Marine Highway System M/V Columbia
attribute NC_GLOBAL Westernmost_Easting double -135.7158
variable vessel_id   String  
attribute vessel_id actual_range String ColumbiaFerry
attribute vessel_id cf_role String trajectory_id
attribute vessel_id ioos_category String Location
variable Type_code   byte  
attribute Type_code actual_range byte 1, 7
attribute Type_code description String Equilibrator air sample = 1, Equilibrator drain air sample = 2, atmospheric air sample = 3, gas standard 1 = 4, gas standard 2 = 5, gas standard 3 = 6, gas standard 4 = 7.
attribute Type_code long_name String Type code for gas measurement sequence
variable time   double  
attribute time _CoordinateAxisType String Time
attribute time actual_range double 1.5089598E9, 1.57005654E9
attribute time axis String T
attribute time ioos_category String Time
attribute time long_name String Date And Time
attribute time source_name String Date and time (yyyy-mm-dd hh:mm:ss)
attribute time standard_name String time
attribute time time_origin String 01-JAN-1970 00:00:00
attribute time units String seconds since 1970-01-01T00:00:00Z
variable PC_Date   String  
attribute PC_Date long_name String PC Date (ddmmyy)
variable PC_time   String  
attribute PC_time long_name String PC Time (hhmmss)
variable GPS_date   String  
attribute GPS_date long_name String GPS Date (ddmmyy)
variable GPS_time   String  
attribute GPS_time long_name String GPS Time (hhmmss)
variable latitude   float  
attribute latitude _CoordinateAxisType String Lat
attribute latitude actual_range float 48.6215, 59.4496
attribute latitude axis String Y
attribute latitude colorBarMaximum double 90.0
attribute latitude colorBarMinimum double -90.0
attribute latitude ioos_category String Location
attribute latitude long_name String Latitude
attribute latitude standard_name String latitude
attribute latitude units String degrees_north
variable longitude   float  
attribute longitude _CoordinateAxisType String Lon
attribute longitude actual_range float -135.7158, -122.511
attribute longitude axis String X
attribute longitude colorBarMaximum double 180.0
attribute longitude colorBarMinimum double -180.0
attribute longitude ioos_category String Location
attribute longitude long_name String Longitude
attribute longitude standard_name String longitude
attribute longitude units String degrees_east
variable equ_temp   float  
attribute equ_temp actual_range float 0.0, 26.11
attribute equ_temp long_name String Equ Temp (deg C)
attribute equ_temp units String degree_Celsius
variable std_val   float  
attribute std_val _FillValue float NaN
attribute std_val actual_range float 150.0, 850.0
attribute std_val long_name String Std Val (ppm)
attribute std_val units String ppm
variable CO2_abs   float  
attribute CO2_abs actual_range float 0.0, 0.18
attribute CO2_abs long_name String raw CO2 Absorbance
variable CO2_ppm   float  
attribute CO2_ppm actual_range float -3.66, 2047.14
attribute CO2_ppm long_name String Raw CO2 mole Fractions in Dry Air
attribute CO2_ppm units String ppm
variable H2O_abs   float  
attribute H2O_abs actual_range float 0.0, 0.0
attribute H2O_abs long_name String Raw H2O Channel Absorbance
variable H2O_ppm   float  
attribute H2O_ppm actual_range float 0.0, 0.0
attribute H2O_ppm long_name String Raw H2O Channel Mole Fractions in Dry Air
attribute H2O_ppm units String ppm
variable LICOR_temp_deg_C   float  
attribute LICOR_temp_deg_C actual_range float 0.0, 51.33
attribute LICOR_temp_deg_C long_name String LICOR Cell Temperature
attribute LICOR_temp_deg_C units String degree_Celsius
variable LICOR_pressure_mbar   float  
attribute LICOR_pressure_mbar actual_range float 0.0, 1032.65
attribute LICOR_pressure_mbar long_name String LICOR Pressure
attribute LICOR_pressure_mbar units String mbar
variable equ_differential_pressure_mbar   float  
attribute equ_differential_pressure_mbar actual_range float -26.08, 6.7
attribute equ_differential_pressure_mbar colorBarMaximum double 10.0
attribute equ_differential_pressure_mbar colorBarMinimum double -10.0
attribute equ_differential_pressure_mbar long_name String Equilibrator Differential Pressure
attribute equ_differential_pressure_mbar units String mbar
variable H2O_flow   float  
attribute H2O_flow actual_range float 0.05, 4.11
attribute H2O_flow long_name String Seawater flow
attribute H2O_flow units String L/min
variable LICOR_flow   float  
attribute LICOR_flow actual_range float -37.02, 665.0
attribute LICOR_flow long_name String LICOR Flow
attribute LICOR_flow units String mL/min
variable equ_pump_speed   float  
attribute equ_pump_speed actual_range float 43.0, 255.0
attribute equ_pump_speed long_name String Equilibrator Pump Speed
attribute equ_pump_speed units String rpm
variable vent_flow   float  
attribute vent_flow actual_range float -39.18, 983.25
attribute vent_flow long_name String Secondary Equilibrator Vent Flow Meter Reading
attribute vent_flow units String mL/min
variable atm_moisture_sensor   float  
attribute atm_moisture_sensor actual_range float 2.48, 9.97
attribute atm_moisture_sensor long_name String Moisture Detector Reading for Sensor on Outlet of Atmospheric Sample Line through the Condenser.
variable equil_moisture_sensor   float  
attribute equil_moisture_sensor actual_range float 9.9, 9.97
attribute equil_moisture_sensor long_name String Moisture Detector Reading for Sensor on Outlet of Seawater Sample Line through the Condenser.
variable drip_sensor   float  
attribute drip_sensor actual_range float 0.03, 9.97
attribute drip_sensor long_name String Moisture Detector on the Inside Bottom of the Wet Box
variable cond_temp   float  
attribute cond_temp actual_range float -0.19, 20.94
attribute cond_temp description String Temperature at which condenser is set. Used to aid in removing water vapor from the gas stream.
attribute cond_temp long_name String Temperature at which Condenser is set
attribute cond_temp units String degree_Celsius
variable dry_box_temp   float  
attribute dry_box_temp actual_range float -0.06, 30.25
attribute dry_box_temp long_name String Dry Box Temperature
attribute dry_box_temp units String degree_Celsius
variable deck_pressure   float  
attribute deck_pressure _FillValue float NaN
attribute deck_pressure actual_range float 982.15, 1034.52
attribute deck_pressure description String Druck barometer pressure located on the Columbia foredeck
attribute deck_pressure long_name String Deck Pressure
attribute deck_pressure units String mbar
variable raw_O2_uM   float  
attribute raw_O2_uM actual_range float 0.0, 1161.29
attribute raw_O2_uM description String Raw dissolved oxygen measurement from the Aanderaa 4330F in micro-mole per liter.
attribute raw_O2_uM long_name String Raw Oxygen Concentration
attribute raw_O2_uM units String umol/L
variable raw_O2_Sat   float  
attribute raw_O2_Sat actual_range float 0.0, 303.53
attribute raw_O2_Sat description String Raw dissolved oxygen percent saturation from the Aanderaa 4330F.
attribute raw_O2_Sat long_name String Raw O2 Percentage of Saturation
attribute raw_O2_Sat units String %
variable O2_Temp   float  
attribute O2_Temp actual_range float 0.0, 30.17
attribute O2_Temp long_name String Oxygen Sensor Temperature
attribute O2_Temp standard_name String temperature_of_sensor_for_oxygen_in_sea_water
attribute O2_Temp units String degree_Celsius
variable Cal_Phase   float  
attribute Cal_Phase actual_range float 0.0, 45.62
attribute Cal_Phase long_name String Calibrated phase from the Aanderaa 4330F
variable TCPhase   float  
attribute TCPhase actual_range float 0.0, 45.16
attribute TCPhase long_name String Temperature compensated phase from the Aanderaa 4330F
variable C1RPh   float  
attribute C1RPh actual_range float 0.0, 54.09
attribute C1RPh long_name String Phase measurement with blue excitation light from the Aanderaa 4330F
variable C2RPh   float  
attribute C2RPh actual_range float 0.0, 9.07
attribute C2RPh long_name String Phase measurement with red excitation light from the Aanderaa 4330F
variable C1Amp   float  
attribute C1Amp actual_range float 0.0, 881.2
attribute C1Amp long_name String Amplitude measurement with blue excitation light from the Aanderaa 4330F
variable C2Amp   float  
attribute C2Amp actual_range float 0.0, 791.8
attribute C2Amp long_name String Amplitude measurement with red excitation light from the Aanderaa 4330F
variable Raw_Temp   float  
attribute Raw_Temp actual_range float -180.8, 709.8
attribute Raw_Temp long_name String Voltage from Aanderaa 4330F thermistor bridge
variable TSG_T   float  
attribute TSG_T _FillValue float NaN
attribute TSG_T actual_range float 0.0, 22.74
attribute TSG_T instrument String SBE 45 MicroTSG
attribute TSG_T long_name String Sea Water Temperature
attribute TSG_T standard_name String sea_surface_temperature
attribute TSG_T units String degree_Celsius
variable TSG_Conductivity   float  
attribute TSG_Conductivity actual_range float 0.0, 4.92
attribute TSG_Conductivity colorBarMaximum double 40.0
attribute TSG_Conductivity colorBarMinimum double 30.0
attribute TSG_Conductivity instrument String SBE 45 MicroTSG
attribute TSG_Conductivity long_name String Sea Water Electrical Conductivity
attribute TSG_Conductivity standard_name String sea_water_electrical_conductivity
attribute TSG_Conductivity units String S/m
variable TSG_Salinity   float  
attribute TSG_Salinity _FillValue float NaN
attribute TSG_Salinity actual_range float 0.94, 32.33
attribute TSG_Salinity colorBarMaximum double 37.0
attribute TSG_Salinity colorBarMinimum double 32.0
attribute TSG_Salinity instrument String SBE 45 MicroTSG
attribute TSG_Salinity long_name String Sea Water Practical Salinity
attribute TSG_Salinity standard_name String sea_water_practical_salinity
attribute TSG_Salinity units String PSU
variable Intake_T   float  
attribute Intake_T _FillValue float NaN
attribute Intake_T actual_range float 0.0, 22.38
attribute Intake_T description String Surface temperature in degrees Celsius from the SBE 38 Digital Oceanographic Thermometer.
attribute Intake_T instrument String SBE 38
attribute Intake_T long_name String Water Intake Temperature
attribute Intake_T standard_name String sea_surface_temperature
attribute Intake_T units String degree_Celsius
variable calibrated_ATM_xCO2_dry   float  
attribute calibrated_ATM_xCO2_dry _FillValue float NaN
attribute calibrated_ATM_xCO2_dry actual_range float 378.79, 449.87
attribute calibrated_ATM_xCO2_dry long_name String Calibrated Atmospheric CO2 mole Fractions in Dry Air
attribute calibrated_ATM_xCO2_dry units String ppm
variable calibrated_SW_xCO2_dry   float  
attribute calibrated_SW_xCO2_dry _FillValue float NaN
attribute calibrated_SW_xCO2_dry actual_range float 29.5, 1206.34
attribute calibrated_SW_xCO2_dry long_name String Calibrated Seawater CO2 mole Fractions in Dry Air
attribute calibrated_SW_xCO2_dry units String ppm
variable ATM_pressure_for_ATM_xCO2   float  
attribute ATM_pressure_for_ATM_xCO2 _FillValue float NaN
attribute ATM_pressure_for_ATM_xCO2 actual_range float 982.15, 1034.52
attribute ATM_pressure_for_ATM_xCO2 long_name String Atmospheric Pressure adjusted for Water Vapor Pressure and Over/Under-Pressurization in the Vessel and used to Compute Atmospheric pCO2
attribute ATM_pressure_for_ATM_xCO2 units String mbar
variable equilibrator_pressure   float  
attribute equilibrator_pressure _FillValue float NaN
attribute equilibrator_pressure actual_range float 981.99, 1034.54
attribute equilibrator_pressure long_name String Pressure of Equilibration Corrected for Vapor Pressure and Over/Under-Pressurization in the Equilibrator and Over/Under-Pressurization in the Vessel and used to compute Seawater pCO2
attribute equilibrator_pressure units String mbar
variable ATM_pCO2_wet   float  
attribute ATM_pCO2_wet _FillValue float NaN
attribute ATM_pCO2_wet actual_range float 377.62, 453.6
attribute ATM_pCO2_wet long_name String Atmospheric partial pressure of carbon dioxide
attribute ATM_pCO2_wet standard_name String surface_partial_pressure_of_carbon_dioxide_in_air
attribute ATM_pCO2_wet units String uatm
variable SW_pCO2_wet_equil_T   float  
attribute SW_pCO2_wet_equil_T _FillValue float NaN
attribute SW_pCO2_wet_equil_T actual_range float 29.5, 1198.73
attribute SW_pCO2_wet_equil_T long_name String Partial pressure of carbon dioxide in Sea Water at Equilibration Temperature
attribute SW_pCO2_wet_equil_T standard_name String surface_partial_pressure_of_carbon_dioxide_in_sea_water
attribute SW_pCO2_wet_equil_T units String uatm
variable SW_pCO2_wet_SST   float  
attribute SW_pCO2_wet_SST _FillValue float NaN
attribute SW_pCO2_wet_SST actual_range float 29.32, 1187.1
attribute SW_pCO2_wet_SST long_name String Surface Partial Pressure of Carbon Dioxide in Sea Water at Sea Surface Temperature
attribute SW_pCO2_wet_SST standard_name String surface_partial_pressure_of_carbon_dioxide_in_sea_water
attribute SW_pCO2_wet_SST units String uatm
variable O2   float  
attribute O2 _FillValue float NaN
attribute O2 actual_range float 139.72, 929.05
attribute O2 description String Salinity and density corrected dissolved oxygen in micro-mole per kilogram from the Aanderaa 4330F. Density was calculated using temperature and salinity from the SBE 45 MicroTSG Thermosalinograph.
attribute O2 long_name String Dissolved Oxygen Molaire Concentration per kg
attribute O2 standard_name String moles_of_oxygen_per_unit_mass_in_sea_water
attribute O2 units String umol/kg
variable O2sol   float  
attribute O2sol _FillValue float NaN
attribute O2sol actual_range float 209.01, 376.08
attribute O2sol description String Dissolved oxygen solubility in micro-mole per kilogram calculated using seawater temperature and salinity from the SBE 45 MicroTSG Thermosalinograph with the relationship (equation 8, combined fit) from Garcia and Gordon, 1992.
attribute O2sol long_name String Dissolved Oxygen Molaire Concentration per kg at Saturation
attribute O2sol units String umol/kg
variable delta_O2   float  
attribute delta_O2 _FillValue float NaN
attribute delta_O2 actual_range float -149.21, 624.77
attribute delta_O2 long_name String Dissolved Oxygen Molaire Concentration Difference to Solubility
attribute delta_O2 units String umol/kg
variable ATM_fCO2_wet   float  
attribute ATM_fCO2_wet _FillValue float NaN
attribute ATM_fCO2_wet actual_range float 376.25, 451.88
attribute ATM_fCO2_wet long_name String Atmospheric CO2 Fugacity in Wet Air
attribute ATM_fCO2_wet units String uatm
variable SW_fCO2_wet   float  
attribute SW_fCO2_wet _FillValue float NaN
attribute SW_fCO2_wet actual_range float 29.21, 1182.53
attribute SW_fCO2_wet long_name String Seawater CO2 Fugacity in Wet Air
attribute SW_fCO2_wet standard_name String fugacity_of_carbon_dioxide_in_sea_water
attribute SW_fCO2_wet units String uatm

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