Surface underway measurements of partial pressure of CO2 (pCO2) and other parameters aboard the CCGS Amundsen during the Canadian Arctic Archipelago cruise (EXPOCODE 18DL20160802) from 2016-08-02 to 2016-09-26 (NCEI Accession 0177875)
INVESTIGATORS:
Mohamed Ahmed 
- University of Calgary; Department of Geography
- University of Calgary; Department of Geography
Brent Else
- University of Calgary, Geography Department
- University of Calgary, Geography Department
Tonya M. Burgers
- University of Manitoba; Center for Earth Observation Science; Department of Environment and Geography
- University of Manitoba; Center for Earth Observation Science; Department of Environment and Geography
Tim Papakyriakou
- University of Manitoba, Center for Earth Observation Science
PACKAGE DESCRIPTION: This dataset includes surface underway, chemical, meteorological and physical data collected aboard the CCGS Amundsen during the Canadian Arctic Archipelago cruise (EXPOCODE 18DL20160802) from 2016-08-02 to 2016-09-26. These data include partial pressure of carbon dioxide (pCO2), barometric pressure, sea surface salinity and sea surface temperature. The instruments used to collect these data include CO2 gas analyzer and shower head chamber equilibrator for autonomous CO2 measurement.
CITE AS: Ahmed, Mohamed; Else, Brent; Burgers, Tonya M.; Papakyriakou, Tim (2018). Surface underway measurements of partial pressure of CO2 (pCO2) and other parameters aboard the CCGS Amundsen during the Canadian Arctic Archipelago cruise (EXPOCODE 18DL20160802) from 2016-08-02 to 2016-09-26 (NCEI Accession 0177875). [indicate subset used]. NOAA National Centers for Environmental Information. Dataset. https://doi.org/10.25921/nqj8-qj37. Accessed [date].
IDENTIFICATION INFORMATION FOR THIS DATA PACKAGE:
NCEI ACCESSION: 0177875
NCEI DOI: https://doi.org/10.25921/nqj8-qj37
EXPOCODE: 18DL20160802;
CRUISE ID: Canadian Arctic Archipelago;
TYPES OF STUDY:
Surface underway;
TEMPORAL COVERAGE:
SPATIAL COVERAGE:
GEOGRAPHIC NAMES:
PLATFORMS:
RESEARCH PROJECT(S):
Surface underway;
TEMPORAL COVERAGE:
START DATE: 2016-08-02
END DATE: 2016-09-26
SPATIAL COVERAGE:
NORTH: 74.9
WEST: -128.1
EAST: -72.5
SOUTH: 67.8
GEOGRAPHIC NAMES:
Baffin Bay;Northwestern Passages;Beaufort Sea;
PLATFORMS:
CCGS Amundsen (ID: 18DL);
RESEARCH PROJECT(S):
Research Cruises;
VARIABLES / PARAMETERS:
| pCO2 (fCO2) autonomous | |
|---|---|
| Abbreviation: | pCO2_SW_Uatm; fCO2_SW_uatm; xCO2_EQU_ppm |
| Unit: | uatm, ppm |
| Observation type: | Surface underway |
| Measured or calculated: | Measured |
| Sampling instrument: | Seawater pump |
| Location of seawater intake: | engine room of CCGS Amundsen |
| Analyzing instrument: | Infrared Analyzer: LI-COR model 7000 |
| Detailed sampling and analyzing information: | This automated underway system operates by directing the seawater flow from a high-volume inlet (located approximately at 7 m beneath the water surface) through a shower-type equilibrator system. The gas in the headspace of the equilibrator is cycled in a closed loop through a LI-COR LI-7000 CO2/H2O gas analyzer at a rate of 80-100 ml min-1 to measure CO2 and H2O mole fraction. See Pierrot, D., C. Neil, K. Sullivan, R. Castle, R. Wanninkhof, H. Lüger, T. Johannessen, A. Olsen, R. A. Feely, and C. E. Cosca (2009), Recommendations for autonomous underway pCO2 measuring systems and data reduction routines, Deep-Sea Res II, 56, 512-522 |
| Equilibrator type: | shower-type equilibrator |
| Is the equilibrator vented or not: | Vented |
| Water flow rate: | 2.4-2.8 L/min |
| Gas flow rate: | ~100 ml/min |
| How was temperature inside the equilibrator measured: | Temperature inside the equilibarator measured with a very accurate (±0.01 °C) and stable Hart digital thermometer with a thermistor probe. However, we applied a temperature correction to account for warming from the seawater intake line to the GO 8050 equilibrator. The temperature correction was done with a regression analysis between the equilibrator water temperature and it's coincident seawater measurements made bt the shup's CTD-rosette. The computed SST values from this linear relationship are the temperatures at which our pCO2 values are reported. Details about this regression, and the statistics of it are included in the second tab of this spreadsheet. |
| How was pressure inside the equilibrator measured: | pressure of gas analyzer (TE connectivity), 13A-015A pressure sensor; sensor was logged to save measurements every minute; accuracy of 0.1% for pressure sensor. |
| Drying method for gas: | The heaspace gas from the equilibrator goes through a condensor, then Naphion drying tubes, then to the CO2 analyzer |
| SEA CO2 gas detector manufacturer: | Licor, Inc |
| SEA CO2 gas detector model: | Licor 7000 |
| SEA CO2 gas detector resolution: | The accuracy of the instrument is nominal ±1% (see Pierrot et al. 2009) |
| SEA CO2 gas detector uncertainty: | The precision of the measurements is ± 1 ppm (see Pierrot et al. 2009) |
| Standardization technique: | The system runs a full cycle in approximately 7 hours. The cycle starts with 4 standard gases, then measures three rounds of 6 atmopherice samples followed by 50 surface water samples. Each new gas is flushed through the Licor Analyzer for 2 minutes prior to a stop-flow measurement. |
| Standardization frequency: | Every 7 hours |
| Standard gas manufacturer: | zero CO2 gas (ultra-pure N2 gas from Praxair), and two span gases (373.07 ppm and 600.02 ppm from Praxair) |
| Standard gas uncertainty: | 0.01 ppm |
| Water vapor correction method: | Details of the data reduction are described in Pierrot, et.al. (2009). |
| Temperature correction method: | Details of the data reduction are described in Pierrot, et.al. (2009). |
| At what temperature was pCO2 reported: | In situ sea surface temperature |
| Uncertainty: | accuracy better than 0.05 deg C for temp. sensor of gas analyzer |
| Method reference: | Pierrot, D., Neill, C., Sullivan, K., Castle, R., Wanninkhof, R., Lüger, H., Johannessen, T., Olsen, A., Feely, R. A., & Cosca, C. E. (2009). Recommendations for autonomous underway pCO2 measuring systems and data-reduction routines. Deep Sea Research Part II: Topical Studies in Oceanography, 56(8-10), 512-522. https://doi.org/10.1016/j.dsr2.2008.12.005 |
| Researcher name: | Mohamed Ahmed |
| Researcher institution: | University of Calgary |
| Sea Surface Temperature | |
|---|---|
| Abbreviation: | SST_C |
| Unit: | degrees celcius |
| Observation type: | Surface Underway |
| Sampling instrument: | temperature (Idronaut) |
| Analyzing instrument: | Idronaut Ocean Seven model 315 |
| Detailed sampling and analyzing information: | sensor was logged to save measurements every minute |
| Uncertainty: | accuracy of 0.002 deg C for water temperature |
| Researcher name: | Mohamed Ahmed |
| Researcher institution: | University of Calgary |
| Sea Surface Salinity | |
|---|---|
| Abbreviation: | SAL_permil |
| Observation type: | Surface Underway |
| Sampling instrument: | salinity (Idronaut) |
| Analyzing instrument: | Idronaut Ocean Seven model 315 |
| Detailed sampling and analyzing information: | sensor was logged to save measureements every minute |
| Uncertainty: | accuracy of 0.003 mS/cm in conductivity measurement |
| Researcher name: | Mohamed Ahmed |
| Researcher institution: | University of Calgary |
| Atmospheric Pressure | |
|---|---|
| Abbreviation: | PRES_ATM@SSP_hPa |
| Unit: | hPa |
| Observation type: | athmospheric |
| Sampling instrument: | pressure of equilibrator (Setra) |
| Analyzing instrument: | 239 setra pressure transducer |
| Detailed sampling and analyzing information: | sensor was logged to save measurements every minute |
| Uncertainty: | accuracy of 0.027 hPa for the Setra pressure transducer |
| Researcher name: | Mohamed Ahmed |
| Researcher institution: | University of Calgary |
PUBLICATIONS DESCRIBING THIS DATASET:
Ahmed, M., Else, B. G. T., Burgers, T. M., Papakyriakou, T. (2019). Variability of Surface Water pCO2 in the Canadian Arctic Archipelago from 2010 to 2016. Journal of Geophysical Research: Oceans. https://doi.org/10.1029/2018JC014639
ADDITIONAL INFORMATION:
none;
FUNDING AGENCY:
SUBMITTED BY: Mohamed Ahmed (mohamed.ahmed3@ucalgary.ca)
SUBMISSION DATE: 2018-10-30
REVISION DATE: 2021-04-13
PREVIOUS VERSIONS: Version 1.1
