Dissolved inorganic carbon (DIC), total alkalinity (TA), pH on total scale, partial pressure of CO2 (pCO2), hydrogen sulfide (H2S), methane (CH4), nutrients, dissolved oxygen, water temperature, salinity and other measurements collected from discrete samples and profile observations in Whycocomagh Bay, Bras d’Or lakes from 2016-12-06 to 2017-12-05 (NCEI Accession 0240802)
INVESTIGATORS:
Kumiko Azetsu-Scott 
- Bedford Institute of Oceanography (BIO), Fisheries and Oceans Canada, Canada
- Bedford Institute of Oceanography (BIO), Fisheries and Oceans Canada, Canada
Stephen Punshon
- Bedford Institute of Oceanography (BIO), Fisheries and Oceans Canada, Canada
PACKAGE DESCRIPTION: This dataset includes discrete sample and profile data collected in Whycocomagh Bay, Bras d’Or lakes from 2016-12-06 to 2017-12-05. These data include dissolved inorganic carbon (DIC), total alkalinity (TA), pH on total scale, partial pressure of CO2 (pCO2), hydrogen sulfide (H2S), methane (CH4), nutrients, dissolved oxygen, water temperature, salinity and other measurements. Deeper part of the region is anoxic and the provides an opportunity to study extreme marine redox chemistry.
CITE AS: Azetsu-Scott, Kumiko; Punshon, Stephen (2021). Dissolved inorganic carbon (DIC), total alkalinity (TA), pH on total scale, partial pressure of CO2 (pCO2), hydrogen sulfide (H2S), methane (CH4), nutrients, dissolved oxygen, water temperature, salinity and other measurements collected from discrete samples and profile observations in Whycocomagh Bay, Bras d’Or lakes from 2016-12-06 to 2017-12-05 (NCEI Accession 0240802). [indicate subset used]. NOAA National Centers for Environmental Information. Dataset. https://doi.org/10.25921/xkfc-rq12. Accessed [date].
IDENTIFICATION INFORMATION FOR THIS DATA PACKAGE:
NCEI ACCESSION: 0240802
NCEI DOI: https://doi.org/10.25921/xkfc-rq12
EXPOCODE: 90UY20161206;
CRUISE ID: 90UY161206;
SECTION/LEG: OAP;
TYPES OF STUDY:
Discrete measurement;Profile;
TEMPORAL COVERAGE:
SPATIAL COVERAGE:
GEOGRAPHIC NAMES:
PLATFORMS:
RESEARCH PROJECT(S):
Discrete measurement;Profile;
TEMPORAL COVERAGE:
START DATE: 2016-12-06
END DATE: 2017-12-05
SPATIAL COVERAGE:
NORTH: 45.9648
WEST: -61.1261
EAST: -61.041
SOUTH: 45.94383
GEOGRAPHIC NAMES:
Bras d’Or lakes;Gulf of St Lawrence;Whycocomagh Bay;
PLATFORMS:
Small Vessel (ID: 90UY);
RESEARCH PROJECT(S):
Bras d'Or Lakes Monitoring;
VARIABLES / PARAMETERS:
| Dissolved Inorganic Carbon | |
|---|---|
| Abbreviation: | TCARBN |
| Unit: | umol / kg |
| Observation type: | discrete |
| Measured or calculated: | measured |
| Sampling instrument: | CTD and rosette bottle sampler: Niskin bottle; 10 L |
| Analyzing instrument: | SOMMA with UIC 5011 coulometer |
| Detailed sampling and analyzing information: | Seawater samples were collected from standard depths in 500 mL borosilicate glass reagent bottles. Five mL of water was removed to allow room for thermal expansion and the sample was preserved within 30 minutes of collection with 0.1 mL of a mercuric chloride saturated solution; then sealed with Apiezon M grease and the ground glass stoppers secured in place with rubber bands. The samples were stored at room temperature until on-shore laboratory analysis. The samples were analysed for DIC using a SOMMA sample handling system in conjunction with a coulometer (UIC Inc.) to quantify total CO2 purged from the acidified sample. Measurements of a Certified reference material seawater (CRMs; Scripps Oceanographic Institution) were used for calibrating DIC with each batch of 20 samples being bracketed by duplicate CRM measurements. |
| Replicate information: | Referenced to duplicate measurement of CRM prior to; and following; each daily batch of DIC samples |
| Standardization description: | Referenced to duplicate measurement of CRM prior to; and following; each daily batch of DIC samples |
| Standardization frequency: | To bracket each batch of 20 samples |
| CRM manufacturer: | Andrew Dickson's Lab at Scripps Institute of Oceanography (co2crms@ucsd.edu) |
| CRM batch number: | 163 |
| Preservation method: | Mercuric chloride saturated solution |
| Preservative volume: | 100 uL per 500 ml sample bottle = 0.02% |
| Preservative correction: | None |
| Uncertainty: | 0.0015 umol.kg |
| Quality flag convention: | 1 = Sample drawn from bottle but analysis not recieved; 2 = QC Performed: Acceptable Measurement; 3 = QC Performed: Questionable Measurement; 4 = QC Performed: Bad Measurement; 5 = QC Performed: Not Reported; 6 = Mean of replicate measurements; 7 = Manual chromatographic peak measurement; 8 = Irregular digital chromatographic peak integration; 9 = Not sampled |
| Method reference: | Dickson; A.G.; Sabine; C.L. and Christian; J.R. (Eds.) 2007. Guide to Best Practices for Ocean CO2 Measurements. PICES Special Publication 3; 191 pp.; https://cdiac.ess-dive.lbl.gov/ftp/oceans/Handbook_2007/Guide_all_in_one.pdf |
| Researcher name: | Kumiko Azetsu-Scott |
| Researcher institution: | Bedford Institute of Oceanography |
| Total alkalinity | |
|---|---|
| Abbreviation: | ALKALI |
| Unit: | umol / kg |
| Observation type: | discrete |
| Measured or calculated: | measured |
| Calculation method and parameters: | Concentration (umol / kg) = concentration (umoles/litre) / density (10 C;S) |
| Sampling instrument: | CTD and rosette bottle sampler: Niskin bottle; 10 L |
| Analyzing instrument: | In-house automated sampler with Metrohm Titrando dosimat and Tiamo software |
| Type of titration: | Potentiometric multi point titration |
| Cell type (open or closed): | Open |
| Curve fitting method: | Gran point |
| Detailed sampling and analyzing information: | Seawater samples were collected from standard depths in 500 mL borosilicate glass reagent bottles. Five mL of water was removed to allow room for thermal expansion and the sample was preserved within 30 minutes of collection with 0.1 mL of a mercuric chloride saturated solution; then sealed with Apiezon M grease and the ground glass stoppers secured in place with rubber bands. The samples were stored at room temperature until on-shore laboratory analysis. TA in the sample was determined using an open cell automated potentiometric titration with a Metrohm Titrando dosing unit controlled by Metrohm Tiamo software. The multi-point titration; using 0.1N HCl titrant containing 35 g of sodium chloride per litre of acid; was performed in a temperature controlled flask held at 25 °C with Gran endpoint determination. Measurements of a Certified reference material seawater (CRMs; Scripps Oceanographic Institution) were used for calibrating TA with each batch of 20 samples being bracketed by duplicate CRM measurements. |
| Replicate information: | Monoplicate sample / monoplicate measurement |
| Standardization description: | Referenced to duplicate measurement of CRM prior to each daily batch of samples |
| Standardization frequency: | Each batch of 20 samples |
| CRM manufacturer: | Andrew Dickson's Lab at Scripps Institute of Oceanography |
| CRM batch number: | 163 |
| Preservation method: | Mercuric chloride saturated solution |
| Preservative volume: | 100 uL per 500 ml sample bottle = 0.02% |
| Preservative correction: | none |
| TA blank correction: | Averages between 10-40 umol / kg |
| Uncertainty: | 0.0025 |
| Quality flag convention: | 1 = Sample drawn from bottle but analysis not recieved; 2 = QC Performed: Acceptable Measurement; 3 = QC Performed: Questionable Measurement; 4 = QC Performed: Bad Measurement; 5 = QC Performed: Not Reported; 6 = Mean of replicate measurements; 7 = Manual chromatographic peak measurement; 8 = Irregular digital chromatographic peak integration; 9 = Not sampled |
| Method reference: | This is method described in SOP 3a of Dickson; A.G.; Sabine; C.L. and Christian; J.R. (Eds.) 2007. Guide to Best Practices for Ocean CO2 Measurements. PICES Special Publication 3; 191 pp |
| Researcher name: | Kumiko Azetsu-Scott |
| Researcher institution: | Bedford Institute of Oceanography |
| pH on total scale at 25 deg. C | |
|---|---|
| Abbreviation: | PH_TOT |
| Controlled vocabulary name: | pH |
| Observation type: | discrete |
| Sampling instrument: | Niskin bottle; 10 L |
| Analyzing instrument: | Agilent 8453 spectrophotometer with 10 cm pathlength cell |
| Detailed sampling and analyzing information: | Seawater samples were collected from the rosette in screw cap 60 mL borosilicate glass bottles which were then refrigerated for up to 2 hours prior to analysis.† Just prior to measurement; the bottles were equilibrated to 25 degrees C in a water bath then transferred into temperature controlled 10 cm quartz cell in an Agilent 8454 spectrophotometer. Following a blank measurement; 25 mL of a 3 milli-molar solution of purified m-cresol purple was added to the sample and the cell shaken to mix the dye solution. Absorbances were measured at 434; 578 and 730 nm and pH determined according to the method described in SOP 6b of Guide to Best Practices for Ocean CO2 measurements (Dickson et al.; 2007). |
| Uncertainty: | 0.003 |
| Quality flag convention: | 1 = Sample drawn from bottle but analysis not recieved; 2 = QC Performed: Acceptable Measurement; 3 = QC Performed: Questionable Measurement; 4 = QC Performed: Bad Measurement; 5 = QC Performed: Not Reported; 6 = Mean of replicate measurements; 7 = Manual chromatographic peak measurement; 8 = Irregular digital chromatographic peak integration; 9 = Not sampled |
| Method reference: | Dickson; A.G.; Sabine; C.L. and Christian; J.R. (Eds.) 2007. Guide to Best Practices for Ocean CO2 Measurements. PICES Special Publication 3; 191 pp.; https://cdiac.ess-dive.lbl.gov/ftp/oceans/Handbook_2007/Guide_all_in_one.pdf |
| Researcher name: | Kumiko Azetsu-Scott |
| Researcher institution: | Bedford Institute of Oceanography |
| Partial Pressure of CO2 | |
|---|---|
| Abbreviation: | pCO2 |
| Unit: | uatm |
| Observation type: | discrete |
| Sampling instrument: | Niskin bottle; 10 L |
| Analyzing instrument: | SRI 8610C gas chromatograph with flame ionization detector and methanizer |
| Detailed sampling and analyzing information: | Seawater samples were collected in 160 mL volume crimp seal serum bottles; allowing the bottle to overflow by 3 volumes. The sample was immediately stabilised by the addition of 50 mL of saturated mercuric chloride solution; crimp sealed with a butyl rubber septum then stored in a refrigerator. Before analysis; a 11 mL headspace of 400 ppm CO2 in zero air was introduced into the bottle which was then thermally equilibrated at 22 deg.C for one hour. The bottle was then shaken vigorously for 8 minutes and the headspace displaced by a brine solution; flushing the sample loop of an SRI gas chromatograph equipped with a methaniser and flame ionisation detector. CO2 peaks were calibrated by injections of primary standard gas mixtures (Air Liquide) having CO2 mixing ratios of 397.3; 797.2; 1201 and 2017 ppm. |
| Uncertainty: | 1 uatm |
| Quality flag convention: | 1 = Sample drawn from bottle but analysis not recieved; 2 = QC Performed: Acceptable Measurement; 3 = QC Performed: Questionable Measurement; 4 = QC Performed: Bad Measurement; 5 = QC Performed: Not Reported; 6 = Mean of replicate measurements; 7 = Manual chromatographic peak measurement; 8 = Irregular digital chromatographic peak integration; 9 = Not sampled |
| Method reference: | Dickson; A.G.; Sabine; C.L. and Christian; J.R. (Eds.) 2007. Guide to Best Practices for Ocean CO2 Measurements. PICES Special Publication 3; 191 pp.; https://cdiac.ess-dive.lbl.gov/ftp/oceans/Handbook_2007/Guide_all_in_one.pdf |
| Researcher name: | Kumiko Azetsu-Scott |
| Researcher institution: | Bedford Institute of Oceanography |
| CTD Temperature | |
|---|---|
| Abbreviation: | CTDTMP |
| Unit: | degrees celcius |
| Observation type: | CTD sensor |
| Sampling instrument: | CTD |
| Analyzing instrument: | CTD |
| Quality flag convention: | WOCE quality control flags are used: 2 = good value, 3 = questionable value, 4 = bad value |
| CTD Salinity | |
|---|---|
| Abbreviation: | CTDSAL |
| Observation type: | CTD sensor |
| Sampling instrument: | CTD |
| Analyzing instrument: | CTD |
| Quality flag convention: | WOCE quality control flags are used: 2 = good value, 3 = questionable value, 4 = bad value |
| CTD Oxygen | |
|---|---|
| Abbreviation: | CTDOXY |
| Unit: | umol/kg |
| Observation type: | CTD sensor |
| Sampling instrument: | CTD |
| Analyzing instrument: | CTD |
| Quality flag convention: | WOCE quality control flags are used: 2 = good value, 3 = questionable value, 4 = bad value |
| Nutrients | |
|---|---|
| Abbreviation: | SILCAT, NITRIT, PHSPHT, NO2+NO3 |
| Unit: | UMOL/KG |
| Observation type: | Bottle, discrete |
| Sampling instrument: | Niskin bottles |
| Quality flag convention: | WOCE quality control flags are used: 2 = good value, 3 = questionable value, 4 = bad value |
| methane | |
|---|---|
| Abbreviation: | CH4 |
| Unit: | NMOL/KG |
| Observation type: | Bottle, discrete |
| Sampling instrument: | Niskin bottles |
| Quality flag convention: | WOCE quality control flags are used: 2 = good value, 3 = questionable value, 4 = bad value |
PUBLICATIONS DESCRIBING THIS DATASET:
none;
ADDITIONAL INFORMATION:
Data extracted from BioChem; the Fisheries and Oceans Canada database for biological and chemical data (Devine; L.; M.K. Kennedy; I. St-Pierre; C. Lafleur; M. Ouellet; and data. Bond. 2014. BioChem: the Fisheries and Oceans Canada database for biological and chemical data. Can. Tech. Rep. Fish. Aquat. Sci. 3073: iv + 40 pp.; http://science-catalogue.canada.ca/record=b4008162~S6)
FUNDING:
Government of Canada: Fisheries and Oceans Canada
PROJECT TITLE:
Aquatic Climate Change Adaptation Services Program (ACCASP)
PROJECT ID:
881-15K-96036
SUBMITTED BY: Reid Steele (Reid.Steele@dfo-mpo.gc.ca)
SUBMISSION DATE: 2021-08-26
