High-resolution record of 8-m seawater CO2 content entering Fanny Bay Oysters in Baynes Sound, British Columbia, Canada from March 2017 to November 2017

Baynes Sound, located on the northwestern side of the Strait of Georgia, has been a site for shore-based and high-resolution measurement of surface seawater CO2 content since March 2017. Measurements of in situ temperature, salinity, and CO2 partial pressure are made near-continuously from a seawater intake line at the Taylor Shellfish facility Fanny Bay Oysters with an intake 300 m from shore and at a depth of 8 m in Mud Bay, a peripheral bay on the eastern side of Baynes Sound. The effort to collect these data are part of the Hakai Institute’s directive to advance the understanding of carbon cycling in northeast Pacific coastal settings with specific emphasis on sea-air CO2 exchange and ocean acidification. This data contribution consists of measurements collected from March 7, 2017 to November 7, 2017.

Type of Study: Continuous data record

Temporal Coverage: March 7, 2017 to November 7, 2017

Spatial Coverage: Seawater drawn from 8-m depth approximately 300 m from shore in Mud Bay; eastern Baynes Sound; northwestern Strait of Georgia; 49.4731°N, 124.7864°W

Geographic Names: Baynes Sound; northwestern Strait of Georgia; British Columbia coast; North Pacific Ocean

Location of organism collection: N/A

Platforms: Shellfish aquaculture plant; Taylor Shellfish Fanny Bay Oysters

Version: 1.0

Submission Date: November 9, 2017

Variables: Partial pressure of carbon dioxide: Abbreviation: pCO2 Unit: µatm Observation type: measurements from continuously flowing seawater stream In-situ/Manipulation/Response variable: In situ observation Measured or calculated: calculated from measured CO2 mole fractions (xCO2) and ambient atmospheric pressure. Sampling instrument: showerhead equilibrator Analyzing instrument: Sunburst Sensors SuperCO2 with LI-COR LI-840A See methodology reference material section below for more details.

Sea surface temperature: Abbreviation: SST Unit: °C, ITS-90 scale Observation type: measurements from continuously flowing seawater stream In-situ/Manipulation/Response variable: In situ observation Measured or calculated: measured Sampling instrument: N/A Analyzing instrument: Sea-Bird SBE 45 MicroTSG Thermosalinograph Detailed sampling and analyzing information: 2 sec data captured using National Instruments LabVIEW software on an HP laptop computer Replicate information: N/A Standardization description: N/A Standardization frequency: N/A CRM manufacturer: N/A Poison name: N/A Poison volume: N/A Poison correction: N/A Uncertainty: 0.002°C Quality flag convention: no quality flag applied Method reference: Evans, W., J. T. Mathis, J. Ramsay, and J. Hetrick (2015), On the Frontline: Tracking Ocean Acidification in an Alaskan Shellfish Hatchery, PLoS One, 10(7), e0130384, doi:10.1371/journal.pone.0130384.

Salinity: Abbreviation: Salinity Unit: 1978 Practical Salinity Scale Observation type: measurements from continuously flowing seawater stream In-situ/Manipulation/Response variable: In situ observation Measured or calculated: calculated from conductivity and temperature measurements Sampling instrument: N/A Analyzing instrument: Sea-Bird SBE 45 MicroTSG Thermosalinograph Detailed sampling and analyzing information: 2 sec data captured using National Instruments LabVIEW software on an HP laptop computer Replicate information: N/A Standardization description: N/A Standardization frequency: N/A CRM manufacturer: N/A Poison name: N/A Poison volume: N/A Poison correction: N/A Uncertainty: 0.003 S/m Quality flag convention: no quality flag applied Method reference: Evans, W., J. T. Mathis, J. Ramsay, and J. Hetrick (2015), On the Frontline: Tracking Ocean Acidification in an Alaskan Shellfish Hatchery, PLoS One, 10(7), e0130384, doi:10.1371/journal.pone.0130384.

Researcher name: Wiley Evans

Researcher institution: Hakai Institute

Column headings: (1) Yearday (2) Year (3) Matlab Time (4) Date and Time (5) pCO2 (uatm) (6)TSG_T (°C) (7)TSG_S (PSS-78)

Filename: SuperCO2_FannyBay5mindata_submission.txt

Investigators: Wiley Evans (Hakai Institute), Alex Hare (Hakai Institute), and Katie Pocock (Hakai Institute)

Cite as: Evans, W., A. Hare, and K. Pocock. (2017). High-resolution record of 8-m seawater CO2 content entering Fanny Bay Oysters in Baynes Sound, British Columbia, Canada from March 2017 to November 2017. Version 1.0. Hakai Institute. Dataset. [access date].

Researcher Contact: Please direct questions regarding these data or requests for processing code, 2-sec processed data, or processing descriptions to Wiley Evans (wiley.evans@hakai.org).

Methodology Reference Material: Analyzing instrument: Sunburst Sensors SuperCO2 with LI-COR LI-840A Detailed sampling and analyzing information: Seawater pCO2 data were calculated from corrected measurements of CO2 mixing ratio (xCO2) made using a Sunburst Sensors SuperCO2 System (http://www.sunburstsensors.com/products/oceanographic-carbon-dioxide-sensor-benchtop-li-cor.html) following protocols recommended by Pierrot et al. (2009) with the system theory and calculations described in detail elsewhere (Evans et al., 2011; 2012; 2013; Hales et al., 2004). Seawater continuously flowed first through the thermosalinograph and then through two (primary and secondary) showerhead equilibrators (Takahashi, 1961). The primary showerhead equilibrator supplied equilibrated carrier gas (marine air) to a non-dispersive infrared gas analyzer (LI-COR LI840A CO2/H2O) housed within the SuperCO2 system’s electronics box at a rate of ~50 ml min-1. The secondary equilibrator acted to pre-equilibrate any make-up air drawn into the primary equilibrator that was needed to replace equilibrated carrier gas provided to the LI-COR. Wet-wall pre-equilibrated air was was drawn from the headspace within the vertical PVC drain of the primary equilibrator through 0.25-inch polyethylene tubing to the secondary equilibrator. Additional pre-equilibration of the make-up air took place in the secondary equilibrator before being drawn into the primary equilibrator through 0.25-inch polyethylene. The need for make-up air was minimized by recirculating the equilibrated carrier gas exiting the LI-COR back to the primary equilibrator. Pressure and temperature were continuously measured in the primary equilibrator using a Honeywell ASCX Microstructure Pressure Sensor and a Minco Fast Response RTD, respectively. Equilibrated carrier gas and three standard gases of known mixing ratio (150.4, 453 and 750 ppm; Scott-Marin, Inc.) were all plumbed to provide gas flow to the SuperCO2 system’s electronics box. The SuperCO2 system was controlled using custom National Instruments LabVIEW software run on an HP laptop computer. The software controls data acquisition from the thermosalinograph, the pressure and temperature sensors, and the LI-COR; while also controlling Valco Instruments Co. Inc. (VICI) multi-port actuators that cycle between the gas streams plumbed to the electronics box. None of the gas streams were dried prior to analysis, and all measurements were made at 0.5 Hz. The prescribed measurement scheme controlled by the software was to supply equilibrated carrier gas from the primary equilibrator to the LI-COR continuously for 720 minutes, then cycle the actuators to consecutively allow the three standard gas streams to be measured for 120 s at 100 ml min-1 before returning to sample the carrier gas equilibrated with seawater xCO2. From each sequence of standard gas measurements, the final 20 s of data in the 120 s interval before the actuator changed position were used to construct calibration functions that were then interpolated in time between standard gas sequences. These functions were then used to calibrate the xCO2 measurements of seawater equilibrated carrier gas, with an adjustment on the order of 1%. Corrected seawater xCO2 was subsequently adjusted for any pressure difference from the ambient atmosphere in the primary showerhead equilibrator using the ratio of equilibrator to vented LI-COR cell pressure, and then converted to pCO2 using atmospheric pressure measured by the LI-COR. The 2-s seawater pCO2, temperature and salinity data were quality controlled, and then bin-averaged in 5-min interval bins. SuperCO2 system accuracy was determined by comparing calibrated xCO2 measurements made on gas standards to known standard concentrations. Calibrated xCO2 were consistently within 2 ppm of the known value. Replicate information: N/A Standardization description: xCO2 calibration functions developed during periodic sequential analysis of gas standards of known concentration (150.4, 453 and 750 ppm; Scott-Marin, Inc.) Standardization frequency: Every 720 minutes. CRM manufacturer: Scott-Marrin, Inc. Poison name: N/A Poison volume: N/A Poison correction: N/A Uncertainty: 2 ppm for calibrated xCO2; ~2 µatm for pCO2 Quality flag convention: no quality flag applied Method references: Evans, W., J. T. Mathis, J. Ramsay, and J. Hetrick (2015), On the Frontline: Tracking Ocean Acidification in an Alaskan Shellfish Hatchery, PLoS One, 10(7), e0130384, doi:10.1371/journal.pone.0130384; Evans, W., B. Hales, and P. G. Strutton (2011), The seasonal cycle of surface ocean pCO2 on the Oregon shelf, Journal of Geophysical Research, 116(C05012), doi: 10.1029/2010JC006625; Evans, W., B. Hales, P. G. Strutton, and D. Ianson (2012), Sea-air CO2 fluxes in the western Canadian coastal ocean, Progress in Oceanography, doi: 10.1016/j.pocean.2012.1001.1003; Evans, W., B. Hales, and P. G. Strutton (2013), pCO2 distributions and air-water CO2 fluxes in the Columbia River estuary, Estuarine, Coastal and Shelf Science, 117, doi: 10.1016/j.ecss.2012.1012.1003; Hales, B., D. Chipman, and T. Takahashi (2004), High-frequency measurements of partial pressure and total concentration of carbon dioxide in seawater using microporous hydrophobic membrane contactors, Limnology and Oceanography: Methods, 2, 356-364; Pierrot, D., C. Neill, 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 Research Part II: Topical Studies in Oceanography, 56(8-10), 512-522, doi:10.1016/j.dsr2.2008.12.005; Takahashi, T. (1961), Carbon Dioxide in the Atmosphere and in Atlantic Ocean Water, Journal of Geophyiscal Research, 66(2), 477-494

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Licence: Appropriate credit must be given to Hakai Institute and the authors of the dataset.

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Dates

Metadata Created October 26, 2018, 22:48 (UTC)
Metadata Updated October 26, 2018, 22:48 (UTC)
Reference Date(s) 2017-09-16 (Creation)
2017-10-06 (Publication)
Frequency of Update
Metadata Date October 17, 2018, 18:30 (UTC)

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Contact Email data@hakai.org
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metadata-language eng
progress completed
resource-type dataset
Responsible Party Hakai Institute (Point of Contact, Processor)
spatial-reference-system 3006