Dataset Overview | National Centers for Environmental Information (NCEI)

Measurements of pH, dissolved inorganic carbon, total alkalinity and other variables for the assessment of the suitability of Durafet-based sensors for pH measurement in dynamic estuarine environments (Delaware Bay) from 2016-05-09 to 2016-08-24 (NCEI Accession 0168767)

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This dataset includes measurements of sea surface temperature, salinity, dissolved inorganic carbon, total alkalinity, pH_NBS and Colored Dissolved Organic Matter (CDOM) from time series stations in Delaware Bay from 2016-05-09 to 2016-08-24. In the environment of the Murderkill Estuary and Delaware Bay (Delaware, USA), the Honeywell Durafet proved capable of making high-resolution and high-frequency pH measurements on the total scale between pH 6.8 and 8.4. Natural pH fluctuations of >1 pH were routinely captured over a range of timescales. The experiment demonstrated the viability of the Honeywell Durafet to the measurement of pH to within the weather-level precision defined by the Global Ocean Acidification Observing Network (GOA-ON, less than 0.02 pH) as a part of future estuarine CO2 chemistry studies undertaken in dynamic environments.

Dataset Citation

Cite as: Gonski, Stephen F.; Cai, Wei-Jun; Ullman, William J.; Joesoef, Andrew A.; Main, Christopher R.; Pettay, Daniel T.; Martz, Todd R. (2017). Measurements of pH, dissolved inorganic carbon, total alkalinity and other variables for the assessment of the suitability of Durafet-based sensors for pH measurement in dynamic estuarine environments (Delaware Bay) from 2016-05-09 to 2016-08-24 (NCEI Accession 0168767). [indicate subset used]. NOAA National Centers for Environmental Information. Dataset. https://doi.org/10.7289/v5zp44d7. Accessed [date].

Dataset Identifiers

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gov.noaa.nodc:0168767

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Distributor	NOAA National Centers for Environmental Information +1-301-713-3277 NCEI.Info@noaa.gov
Dataset Point of Contact	NOAA National Centers for Environmental Information ncei.info@noaa.gov

Time Period	2016-05-09 to 2016-08-24
Spatial Bounding Box Coordinates	West: -75.39 East: -75.39 South: 39.05 North: 39.05
Spatial Coverage Map

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Associated Resources

Gonski, S. F., Cai, W.-J., Ullman, W. J., Joesoef, A., Main., C. R., Pettay, D. T., and Martz, T. R. (2017). Assessment of the suitability of Durafet-based sensors for pH measurement in dynamic estuarine environments. Estuarine, Coastal, and Shelf Science, 200, 152-168.
Voynova, Y. G., Lebaron, K. C., Barnes, R. T., and Ullman, W. J. (2015). In situ response of bay productivity to nutrient loading from a small tributary: The Delaware Bay-Murderkill Estuary tidally-coupled biogeochemical reactor. Estuarine, Coastal, and Shelf Science, 160, 33-48.
NOAA National Centers for Environmental Information (2022). Ocean Carbon and Acidification Data System (OCADS). NOAA National Centers for Environmental Information. https://www.ncei.noaa.gov/products/ocean-carbon-acidification-data-system
- https://www.ncei.noaa.gov/products/ocean-carbon-acidification-data-system
  OCADS website

Publication Dates	publication: 2017-12-12
Data Presentation Form	Digital table - digital representation of facts or figures systematically displayed, especially in columns
Dataset Progress Status	Complete - production of the data has been completed Historical archive - data has been stored in an offline storage facility
Data Update Frequency	As needed
Purpose	To assess the performance of the Honeywell Durafet for pH measurement in estuaries with broad salinity ranges and wide ranges of time-varying salinities.
Use Limitations	accessLevel: Public Distribution liability: NOAA and NCEI make no warranty, expressed or implied, regarding these data, nor does the fact of distribution constitute such a warranty. NOAA and NCEI cannot assume liability for any damages caused by any errors or omissions in these data. If appropriate, NCEI can only certify that the data it distributes are an authentic copy of the records that were accepted for inclusion in the NCEI archives.

Dataset Citation	Cite as: Gonski, Stephen F.; Cai, Wei-Jun; Ullman, William J.; Joesoef, Andrew A.; Main, Christopher R.; Pettay, Daniel T.; Martz, Todd R. (2017). Measurements of pH, dissolved inorganic carbon, total alkalinity and other variables for the assessment of the suitability of Durafet-based sensors for pH measurement in dynamic estuarine environments (Delaware Bay) from 2016-05-09 to 2016-08-24 (NCEI Accession 0168767). [indicate subset used]. NOAA National Centers for Environmental Information. Dataset. https://doi.org/10.7289/v5zp44d7. Accessed [date].
Cited Authors	Gonski, Stephen F. University of Delaware; College of Earth, Ocean, and Environment; School of Marine Science and Policy Cai, Wei-Jun University of Delaware Ullman, William J. Joesoef, Andrew A. University of Delaware; College of Earth, Ocean, and Environment; School of Marine Science and Policy Main, Christopher R. Pettay, Daniel T. Martz, Todd R.
Principal Investigators	Wei-Jun Cai University of Delaware Stephen F. Gonski University of Delaware; College of Earth, Ocean, and Environment; School of Marine Science and Policy
Contributors	University of Delaware
Resource Providers	Wei-Jun Cai University of Delaware University of Delaware
Publishers	NOAA National Centers for Environmental Information
Acknowledgments	Funding Information: University of Delaware Provost's Office and the College of Earth (Delaware Sea Grant award (HCE-23), SMSP175136)

Theme keywords	NODC DATA TYPES THESAURUS DISSOLVED INORGANIC CARBON (DIC) pH total alkalinity NODC OBSERVATION TYPES THESAURUS chemical discrete sample physical surface measurements WMO_CategoryCode oceanography Global Change Master Directory (GCMD) Science Keywords EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > ALKALINITY EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > INORGANIC CARBON EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > PH OCADS Study Type Surface measurement Time series Provider Keywords 39N75WDE20160509 Provider Variable Abbreviations CDOM Conductivity DIC DOC Del_TA Del_pH_INT-EXT Del_pH_scales E0ext25 E0int25 Eext Eint Pressure SST Salinity Total Alkalinity pH Ext Raw pH Int Raw pH^Cond_DIC-TA pH^EXT_final,1 pH^EXT_final,1A pH^EXT_final,1B pH^EXT_final,2 pH^EXT_final,2A pH^EXT_final,2B pH^INT_final,1 pH^INT_final,2 pH^disc_DIC-TA pH^disc_elec pH_field_NBS
Data Center keywords	NODC COLLECTING INSTITUTION NAMES THESAURUS University of Delaware NODC SUBMITTING INSTITUTION NAMES THESAURUS University of Delaware
Instrument keywords	NODC INSTRUMENT TYPES THESAURUS coulometer for DIC measurement pH sensor titrator Global Change Master Directory (GCMD) Instrument Keywords COULOMETERS PH METERS > PH METERS
Place keywords	NODC SEA AREA NAMES THESAURUS Delaware Bay Global Change Master Directory (GCMD) Location Keywords OCEAN > ATLANTIC OCEAN > NORTH ATLANTIC OCEAN Provider Geographic Names Delaware Bay
Project keywords	Cruise ID 39N75WDE20160509 EXPOCODE 39N75WDE20160509 Ocean Acidification Search Keywords Ocean Carbon and Acidification Data System (OCADS) Project
Keywords	NCEI ACCESSION NUMBER 0168767

Use Constraints	Cite as: Gonski, Stephen F.; Cai, Wei-Jun; Ullman, William J.; Joesoef, Andrew A.; Main, Christopher R.; Pettay, Daniel T.; Martz, Todd R. (2017). Measurements of pH, dissolved inorganic carbon, total alkalinity and other variables for the assessment of the suitability of Durafet-based sensors for pH measurement in dynamic estuarine environments (Delaware Bay) from 2016-05-09 to 2016-08-24 (NCEI Accession 0168767). [indicate subset used]. NOAA National Centers for Environmental Information. Dataset. https://doi.org/10.7289/v5zp44d7. Accessed [date].
Access Constraints	Use liability: NOAA and NCEI cannot provide any warranty as to the accuracy, reliability, or completeness of furnished data. Users assume responsibility to determine the usability of these data. The user is responsible for the results of any application of this data for other than its intended purpose.
Fees	In most cases, electronic downloads of the data are free. However, fees may apply for custom orders, data certifications, copies of analog materials, and data distribution on physical media.

Lineage information for: dataset
Processing Steps	2017-12-12T02:45:05Z - NCEI Accession 0168767 v1.1 was published.
Output Datasets	NCEI Accession 0168767 v1.1 NCEI Accession 0168767 v1.1 (download) published 2017-12-12T02:45:05Z

Lineage information for: dataset
Processing Steps	Parameter or Variable: Dissolved Inorganic Carbon; Abbreviation: DIC; Unit: umol kg-1; Measured or calculated: Measured; Analyzing instrument: Apollo SciTech AS-C3; Preservation method: sat. HgCl2; Preservative volume: 100 uL per 250 mL; Uncertainty: less than 2.2 umol kg-1; Researcher name: Stephen F. Gonski; Researcher institution: University of Delaware, School of Marine Science and Policy (now at: University of Calgary, Department of Geography). Parameter or Variable: Total alkalinity; Abbreviation: Total Alkalinity; Unit: umol kg-1; Measured or calculated: Measured; Analyzing instrument: Apollo SciTech AS-ALK2; Preservation method: sat. HgCl2; Preservative volume: 100 uL per 250 mL; Uncertainty: less than 2.2 umol kg-1; Researcher name: Stephen F. Gonski; Researcher institution: University of Delaware, School of Marine Science and Policy (now at: University of Calgary, Department of Geography). Parameter or Variable: pH; Abbreviation: pH_field_NBS; pH scale: NBS Scale; Measured or calculated: Measured; Analyzing instrument: Orion Dual Star pH/ISE Benchtop Meter equipped with an Orion 8302BNUMD Ross Ultra Glass Triode pH/ATC Combination Electrode; Temperature of pH measurement: +/-0.3degC of SST recorded by SeapHOx Sensor; Standardization frequency: every 2-3 hours during 10-12 hour fieldwork days; pH standard values: NBS 4.01, 7.00, and 10.01 pH buffers; Temperature correction method: Corrected to in situ temperature using Excel macro CO2SYS (Pierrot et al., 2006); At what temperature was pH reported: SST recorded by SeapHOx Sensor; Uncertainty: less than 0.02 pH (integrated into final uncertainty of all calibrated sensor pH datasets); Researcher name: Stephen F. Gonski; Researcher institution: University of Delaware, School of Marine Science and Policy (now at: University of Calgary, Department of Geography). Parameter or Variable: In situ temperature recorded by SeapHOx Sensor; Abbreviation: SST; Unit: oC; Analyzing instrument: Sea-Bird Electronics Conductivity-Temperature Sensor, SBE37 integated with SeapHOx Sensor; Uncertainty: NA; Researcher name: Stephen F. Gonski; Researcher institution: University of Delaware, School of Marine Science and Policy (now at: University of Calgary, Department of Geography). Parameter or Variable: Salinity recorded by SeapHOx Sensor; Abbreviation: Salinity; Unit: NA; Observation type: Salinity calculated from temperature and conductivity; Analyzing instrument: Sea-Bird Electronics Conductivity-Temperature Sensor, SBE37 integated with SeapHOx Sensor; Uncertainty: NA; Researcher name: Stephen F. Gonski; Researcher institution: University of Delaware, School of Marine Science and Policy (now at: University of Calgary, Department of Geography). Parameter or Variable: Pressure measured with equipment integrated with SeapHOx Sensor; Abbreviation: Pressure; Unit: dbar; Uncertainty: NA; Researcher name: Stephen F. Gonski; Researcher institution: University of Delaware, School of Marine Science and Policy (now at: University of Calgary, Department of Geography). Parameter or Variable: raw pH on the total scale calculated using the Honeywell Durafet and its internal reference electrode (Ag/AgCl reference electrode containing a 4.5 M KCl Liquid Junction); Abbreviation: pH Int Raw; Unit: pH; Observation type: Sensor Data; Analyzing instrument: Honeywell Durafet integrated with SeapHOx Sensor; Uncertainty: Not reported for raw data; Researcher name: Stephen F. Gonski; Researcher institution: University of Delaware, School of Marine Science and Policy (now at: University of Calgary, Department of Geography). Parameter or Variable: raw pH on the total scale calculated using the Honeywell Durafet and its external reference electrode (solid-state chloride ion-selective electrode, Cl-ISE); Abbreviation: pH Ext Raw; Unit: pH; Observation type: Sensor Data; Analyzing instrument: Honeywell Durafet integrated with SeapHOx Sensor; Uncertainty: Not reported for raw data; Researcher name: Stephen F. Gonski; Researcher institution: University of Delaware, School of Marine Science and Policy (now at: University of Calgary, Department of Geography). Parameter or Variable: pH on the total scale calculated from measured DIC and TA at in situ temperature, salinity, and pressure using Excel macro CO2SYS (Pierrot et al., 2006) using the inorganic carbon dissociation constants of Millero et al. (2006), the bisulfate ion acidity constant of Dickson (1990), and the boron-to-chlorinity ratio of Lee et al. (2010); Abbreviation: pH^disc_DIC-TA; Unit: pH; Uncertainty: Not reported (integrated into final uncertainty of all calibrated sensor pH datasets); Researcher name: Stephen F. Gonski; Researcher institution: University of Delaware, School of Marine Science and Policy (now at: University of Calgary, Department of Geography). Parameter or Variable: Difference between pHNBS and pHT at in situ temperature, salinity, and pressure solely attributed to the difference in pH scales. Calculated as the difference between pHNBS and pHT when each value is calculated from measured DIC and TA at in situ temperature, salinity, and pressure using Excel macro CO2SYS (Pierrot et al., 2006) using the inorganic carbon dissociation constants of Millero et al. (2006), the bisulfate ion acidity constant of Dickson (1990), and the boron-to-chlorinity ratio of Lee et al. (2010).; Abbreviation: Del_pH_scales; Unit: pH; Uncertainty: Not reported (integrated into final uncertainty of all calibrated sensor pH datasets); Researcher name: Stephen F. Gonski; Researcher institution: University of Delaware, School of Marine Science and Policy (now at: University of Calgary, Department of Geography). Parameter or Variable: pHNBS measured with a glass electrode corrected to pHT at in situ conditions. Quanity is equal to the difference of pH^field_NBS (minuend value) and pHscales (subtrahend valiue).; Abbreviation: pH^disc_elec; Unit: pH; Uncertainty: Not reported (integrated into final uncertainty of all calibrated sensor pH datasets); Researcher name: Stephen F. Gonski; Researcher institution: University of Delaware, School of Marine Science and Policy (now at: University of Calgary, Department of Geography). Parameter or Variable: Colored Dissolved Organic Matter (CDOM) measured by equipment integrated with the co-located Kent County Land-Ocean Biogeochemical Observatory (http://kentcounty.loboviz.com/) at SeapHOx Sensor deployment site; Abbreviation: CDOM; Unit: QSDE; Observation type: Sensor Data; Uncertainty: Not Reported; Researcher name: William J. Ullman; Researcher institution: University of Delaware, School of Marine Science and Policy. Parameter or Variable: Dissolved Organic Carbon (DOC) calculated from CDOM using Voynova et al. (2015) (https://doi.org/10.1016/j.ecss.2015.03.027) CDOM-DOC relationship for same deployment site; Abbreviation: DOC; Unit: uM; Uncertainty: Not Reported; Researcher name: Stephen F. Gonski; Researcher institution: University of Delaware, School of Marine Science and Policy (now at: University of Calgary, Department of Geography). Parameter or Variable: Raw voltage measured with Honeywell Durafet's internal reference electrode integrated with SeapHOx Sensor; Abbreviation: Eint; Unit: V; Observation type: Sensor Data; Uncertainty: Not reported for raw data; Researcher name: Stephen F. Gonski; Researcher institution: University of Delaware, School of Marine Science and Policy (now at: University of Calgary, Department of Geography). Parameter or Variable: Raw voltage measured with Honeywell Durafet's external reference electrode integrated with SeapHOx Sensor; Abbreviation: Eext; Unit: V; Observation type: Sensor Data; Uncertainty: Not reported for raw data; Researcher name: Stephen F. Gonski; Researcher institution: University of Delaware, School of Marine Science and Policy (now at: University of Calgary, Department of Geography). Parameter or Variable: Calibration constant for the Honeywell Durafet's internal reference electrode integrated with SeapHOx Sensor that is applied to the pH Int Raw data to produce final calibrated pH dataset; Abbreviation: E0int25; Unit: V; Uncertainty: NA; Researcher name: Stephen F. Gonski; Researcher institution: University of Delaware, School of Marine Science and Policy (now at: University of Calgary, Department of Geography). Parameter or Variable: Calibration constant for the Honeywell Durafet's external reference electrode integrated with SeapHOx Sensor that is applied to the pH Ext Raw data to produce final calibrated pH dataset; Abbreviation: E0ext25; Unit: V; Uncertainty: NA; Researcher name: Stephen F. Gonski; Researcher institution: University of Delaware, School of Marine Science and Policy (now at: University of Calgary, Department of Geography). Parameter or Variable: Conductivity recorded by SeapHOx Sensor; Abbreviation: Conductivity; Unit: S/m; Analyzing instrument: Sea-Bird Electronics Conductivity-Temperature Sensor, SBE37 integated with SeapHOx Sensor; Uncertainty: NA; Researcher name: Stephen F. Gonski; Researcher institution: University of Delaware, School of Marine Science and Policy (now at: University of Calgary, Department of Geography). Parameter or Variable: Calibrated pH on the total scale calculated using the Honeywell Durafet's internal reference electrode. Calibrated using pH^disc_DIC-TA (pH on the total scale calculated from measured DIC and TA at in situ temperature, salinity, and pressure using CO2SYS). Not deployment specific.; Abbreviation: pH^INT_final,1; Unit: pH; Uncertainty: 0.0275 pH units (Spring Data); 0.0159 pH units (Summer Data); Researcher name: Stephen F. Gonski; Researcher institution: University of Delaware, School of Marine Science and Policy (now at: University of Calgary, Department of Geography). Parameter or Variable: Calibrated pH on the total scale calculated using the Honeywell Durafet's internal reference electrode. Calibrated using pH^disc_elec (pHNBS measured with a glass electrode corrected to pHT at in situ conditions). Not deployment specific.; Abbreviation: pH^INT_final,2; Unit: pH; Uncertainty: 0.0358 pH units (Spring Data); 0.0149 pH units (Summer Data); Researcher name: Stephen F. Gonski; Researcher institution: University of Delaware, School of Marine Science and Policy (now at: University of Calgary, Department of Geography). Parameter or Variable: Calibrated pH on the total scale calculated using the Honeywell Durafet's external reference electrode. Calibrated using pH^disc_DIC-TA (pH on the total scale calculated from measured DIC and TA at in situ temperature, salinity, and pressure using CO2SYS). Only calibration points of salinity (S) > 14.84 were used as discussed in Gonski et al. (2018). Specific to spring deployment.; Abbreviation: pH^EXT_final,1A; Unit: pH; Uncertainty: 0.0174 pH units; Researcher name: Stephen F. Gonski; Researcher institution: University of Delaware, School of Marine Science and Policy (now at: University of Calgary, Department of Geography). Parameter or Variable: Calibrated pH on the total scale calculated using the Honeywell Durafet's external reference electrode. Calibrated using pH^disc_DIC-TA (pH on the total scale calculated from measured DIC and TA at in situ temperature, salinity, and pressure using CO2SYS). Only a subset of data above salinity (S) = 20 was used as discussed in Gonski et al. (2018). Specific to spring deployment.; Abbreviation: pH^EXT_final,1B; Unit: pH; Uncertainty: 0.0158 pH units; Researcher name: Stephen F. Gonski; Researcher institution: University of Delaware, School of Marine Science and Policy (now at: University of Calgary, Department of Geography). Parameter or Variable: Calibrated pH on the total scale calculated using the Honeywell Durafet's external reference electrode. Calibrated using pH^disc_elec (pHNBS measured with a glass electrode corrected to pHT at in situ conditions). Only calibration points of salinity (S) > 14.84 were used as discussed in Gonski et al. (2018). Specific to spring deployment.; Abbreviation: pH^EXT_final,2A; Unit: pH; Uncertainty: 0.0114 pH units; Researcher name: Stephen F. Gonski; Researcher institution: University of Delaware, School of Marine Science and Policy (now at: University of Calgary, Department of Geography). Parameter or Variable: Calibrated pH on the total scale calculated using the Honeywell Durafet's external reference electrode. Calibrated using pH^disc_elec (pHNBS measured with a glass electrode corrected to pHT at in situ conditions). Only a subset of data above salinity (S) = 20 was used as discussed in Gonski et al. (2018). Specific to spring deployment.; Abbreviation: pH^EXT_final,2B; Unit: pH; Uncertainty: 0.0123 pH units; Researcher name: Stephen F. Gonski; Researcher institution: University of Delaware, School of Marine Science and Policy (now at: University of Calgary, Department of Geography). Parameter or Variable: Calibrated pH on the total scale calculated using the Honeywell Durafet's external reference electrode. Calibrated using pH^disc_DIC-TA (pH on the total scale calculated from measured DIC and TA at in situ temperature, salinity, and pressure using CO2SYS). Specific to summer deployment.; Abbreviation: pH^EXT_final,1; Unit: pH; Uncertainty: 0.0121 pH units; Researcher name: Stephen F. Gonski; Researcher institution: University of Delaware, School of Marine Science and Policy (now at: University of Calgary, Department of Geography). Parameter or Variable: Calibrated pH on the total scale calculated using the Honeywell Durafet's external reference electrode. Calibrated using pH^disc_elec (pHNBS measured with a glass electrode corrected to pHT at in situ conditions). Specific to summer deployment.; Abbreviation: pH^EXT_final,2; Unit: pH; Uncertainty: 0.0105 pH units; Researcher name: Stephen F. Gonski; Researcher institution: University of Delaware, School of Marine Science and Policy (now at: University of Calgary, Department of Geography). Parameter or Variable: Anomalies between values of pH^INT_final and pH^EXT_final. Quantity is equal to pH^INT_final minus pH^EXT_final for a given time stamp; Abbreviation: Del_pH_INT-EXT; Unit: pH; Uncertainty: Not reported; Researcher name: Stephen F. Gonski; Researcher institution: University of Delaware, School of Marine Science and Policy (now at: University of Calgary, Department of Geography). Parameter or Variable: Calculated pHT of discrete bottle samples collected to gauge intra-deployment conditioning. More specifically, pH on the total scale calculated from measured DIC and TA at in situ temperature, salinity, and pressure using Excel macro CO2SYS (Pierrot et al., 2006) using the inorganic carbon dissociation constants of Millero et al. (2006), the bisulfate ion acidity constant of Dickson (1990), and the boron-to-chlorinity ratio of Lee et al. (2010).; Abbreviation: pH^Cond_DIC-TA; Unit: pH; Uncertainty: Not Reported; Researcher name: Stephen F. Gonski; Researcher institution: University of Delaware, School of Marine Science and Policy (now at: University of Calgary, Department of Geography). Parameter or Variable: Excess Alkalinity. Difference between measured total alkalinity and alkalinity calculated from measured DIC and pH^field_NBS. The latter value was calculated in the Excel macro CO2SYS (Pierrot et al., 2006) using the norganic carbon dissociation constants of Millero et al. (2006), the bisulfate ion acidity constant of Dickson (1990), and the boron-to-chlorinity ratio of Lee et al. (2010).; Abbreviation: Del_TA; Unit: umol kg-1; Uncertainty: Not reported; Researcher name: Stephen F. Gonski; Researcher institution: University of Delaware, School of Marine Science and Policy (now at: University of Calgary, Department of Geography) .

Lineage information for: dataset

Processing Steps

Parameter or Variable: Dissolved Inorganic Carbon; Abbreviation: DIC; Unit: umol kg-1; Measured or calculated: Measured; Analyzing instrument: Apollo SciTech AS-C3; Preservation method: sat. HgCl2; Preservative volume: 100 uL per 250 mL; Uncertainty: less than 2.2 umol kg-1; Researcher name: Stephen F. Gonski; Researcher institution: University of Delaware, School of Marine Science and Policy (now at: University of Calgary, Department of Geography).
Parameter or Variable: Total alkalinity; Abbreviation: Total Alkalinity; Unit: umol kg-1; Measured or calculated: Measured; Analyzing instrument: Apollo SciTech AS-ALK2; Preservation method: sat. HgCl2; Preservative volume: 100 uL per 250 mL; Uncertainty: less than 2.2 umol kg-1; Researcher name: Stephen F. Gonski; Researcher institution: University of Delaware, School of Marine Science and Policy (now at: University of Calgary, Department of Geography).
Parameter or Variable: pH; Abbreviation: pH_field_NBS; pH scale: NBS Scale; Measured or calculated: Measured; Analyzing instrument: Orion Dual Star pH/ISE Benchtop Meter equipped with an Orion 8302BNUMD Ross Ultra Glass Triode pH/ATC Combination Electrode; Temperature of pH measurement: +/-0.3degC of SST recorded by SeapHOx Sensor; Standardization frequency: every 2-3 hours during 10-12 hour fieldwork days; pH standard values: NBS 4.01, 7.00, and 10.01 pH buffers; Temperature correction method: Corrected to in situ temperature using Excel macro CO2SYS (Pierrot et al., 2006); At what temperature was pH reported: SST recorded by SeapHOx Sensor; Uncertainty: less than 0.02 pH (integrated into final uncertainty of all calibrated sensor pH datasets); Researcher name: Stephen F. Gonski; Researcher institution: University of Delaware, School of Marine Science and Policy (now at: University of Calgary, Department of Geography).
Parameter or Variable: In situ temperature recorded by SeapHOx Sensor; Abbreviation: SST; Unit: oC; Analyzing instrument: Sea-Bird Electronics Conductivity-Temperature Sensor, SBE37 integated with SeapHOx Sensor; Uncertainty: NA; Researcher name: Stephen F. Gonski; Researcher institution: University of Delaware, School of Marine Science and Policy (now at: University of Calgary, Department of Geography).
Parameter or Variable: Salinity recorded by SeapHOx Sensor; Abbreviation: Salinity; Unit: NA; Observation type: Salinity calculated from temperature and conductivity; Analyzing instrument: Sea-Bird Electronics Conductivity-Temperature Sensor, SBE37 integated with SeapHOx Sensor; Uncertainty: NA; Researcher name: Stephen F. Gonski; Researcher institution: University of Delaware, School of Marine Science and Policy (now at: University of Calgary, Department of Geography).
Parameter or Variable: Pressure measured with equipment integrated with SeapHOx Sensor; Abbreviation: Pressure; Unit: dbar; Uncertainty: NA; Researcher name: Stephen F. Gonski; Researcher institution: University of Delaware, School of Marine Science and Policy (now at: University of Calgary, Department of Geography).
Parameter or Variable: raw pH on the total scale calculated using the Honeywell Durafet and its internal reference electrode (Ag/AgCl reference electrode containing a 4.5 M KCl Liquid Junction); Abbreviation: pH Int Raw; Unit: pH; Observation type: Sensor Data; Analyzing instrument: Honeywell Durafet integrated with SeapHOx Sensor; Uncertainty: Not reported for raw data; Researcher name: Stephen F. Gonski; Researcher institution: University of Delaware, School of Marine Science and Policy (now at: University of Calgary, Department of Geography).
Parameter or Variable: raw pH on the total scale calculated using the Honeywell Durafet and its external reference electrode (solid-state chloride ion-selective electrode, Cl-ISE); Abbreviation: pH Ext Raw; Unit: pH; Observation type: Sensor Data; Analyzing instrument: Honeywell Durafet integrated with SeapHOx Sensor; Uncertainty: Not reported for raw data; Researcher name: Stephen F. Gonski; Researcher institution: University of Delaware, School of Marine Science and Policy (now at: University of Calgary, Department of Geography).
Parameter or Variable: pH on the total scale calculated from measured DIC and TA at in situ temperature, salinity, and pressure using Excel macro CO2SYS (Pierrot et al., 2006) using the inorganic carbon dissociation constants of Millero et al. (2006), the bisulfate ion acidity constant of Dickson (1990), and the boron-to-chlorinity ratio of Lee et al. (2010); Abbreviation: pH^disc_DIC-TA; Unit: pH; Uncertainty: Not reported (integrated into final uncertainty of all calibrated sensor pH datasets); Researcher name: Stephen F. Gonski; Researcher institution: University of Delaware, School of Marine Science and Policy (now at: University of Calgary, Department of Geography).
Parameter or Variable: Difference between pHNBS and pHT at in situ temperature, salinity, and pressure solely attributed to the difference in pH scales. Calculated as the difference between pHNBS and pHT when each value is calculated from measured DIC and TA at in situ temperature, salinity, and pressure using Excel macro CO2SYS (Pierrot et al., 2006) using the inorganic carbon dissociation constants of Millero et al. (2006), the bisulfate ion acidity constant of Dickson (1990), and the boron-to-chlorinity ratio of Lee et al. (2010).; Abbreviation: Del_pH_scales; Unit: pH; Uncertainty: Not reported (integrated into final uncertainty of all calibrated sensor pH datasets); Researcher name: Stephen F. Gonski; Researcher institution: University of Delaware, School of Marine Science and Policy (now at: University of Calgary, Department of Geography).
Parameter or Variable: pHNBS measured with a glass electrode corrected to pHT at in situ conditions. Quanity is equal to the difference of pH^field_NBS (minuend value) and pHscales (subtrahend valiue).; Abbreviation: pH^disc_elec; Unit: pH; Uncertainty: Not reported (integrated into final uncertainty of all calibrated sensor pH datasets); Researcher name: Stephen F. Gonski; Researcher institution: University of Delaware, School of Marine Science and Policy (now at: University of Calgary, Department of Geography).
Parameter or Variable: Colored Dissolved Organic Matter (CDOM) measured by equipment integrated with the co-located Kent County Land-Ocean Biogeochemical Observatory (http://kentcounty.loboviz.com/) at SeapHOx Sensor deployment site; Abbreviation: CDOM; Unit: QSDE; Observation type: Sensor Data; Uncertainty: Not Reported; Researcher name: William J. Ullman; Researcher institution: University of Delaware, School of Marine Science and Policy.
Parameter or Variable: Dissolved Organic Carbon (DOC) calculated from CDOM using Voynova et al. (2015) (https://doi.org/10.1016/j.ecss.2015.03.027) CDOM-DOC relationship for same deployment site; Abbreviation: DOC; Unit: uM; Uncertainty: Not Reported; Researcher name: Stephen F. Gonski; Researcher institution: University of Delaware, School of Marine Science and Policy (now at: University of Calgary, Department of Geography).
Parameter or Variable: Raw voltage measured with Honeywell Durafet's internal reference electrode integrated with SeapHOx Sensor; Abbreviation: Eint; Unit: V; Observation type: Sensor Data; Uncertainty: Not reported for raw data; Researcher name: Stephen F. Gonski; Researcher institution: University of Delaware, School of Marine Science and Policy (now at: University of Calgary, Department of Geography).
Parameter or Variable: Raw voltage measured with Honeywell Durafet's external reference electrode integrated with SeapHOx Sensor; Abbreviation: Eext; Unit: V; Observation type: Sensor Data; Uncertainty: Not reported for raw data; Researcher name: Stephen F. Gonski; Researcher institution: University of Delaware, School of Marine Science and Policy (now at: University of Calgary, Department of Geography).
Parameter or Variable: Calibration constant for the Honeywell Durafet's internal reference electrode integrated with SeapHOx Sensor that is applied to the pH Int Raw data to produce final calibrated pH dataset; Abbreviation: E0int25; Unit: V; Uncertainty: NA; Researcher name: Stephen F. Gonski; Researcher institution: University of Delaware, School of Marine Science and Policy (now at: University of Calgary, Department of Geography).
Parameter or Variable: Calibration constant for the Honeywell Durafet's external reference electrode integrated with SeapHOx Sensor that is applied to the pH Ext Raw data to produce final calibrated pH dataset; Abbreviation: E0ext25; Unit: V; Uncertainty: NA; Researcher name: Stephen F. Gonski; Researcher institution: University of Delaware, School of Marine Science and Policy (now at: University of Calgary, Department of Geography).
Parameter or Variable: Conductivity recorded by SeapHOx Sensor; Abbreviation: Conductivity; Unit: S/m; Analyzing instrument: Sea-Bird Electronics Conductivity-Temperature Sensor, SBE37 integated with SeapHOx Sensor; Uncertainty: NA; Researcher name: Stephen F. Gonski; Researcher institution: University of Delaware, School of Marine Science and Policy (now at: University of Calgary, Department of Geography).
Parameter or Variable: Calibrated pH on the total scale calculated using the Honeywell Durafet's internal reference electrode. Calibrated using pH^disc_DIC-TA (pH on the total scale calculated from measured DIC and TA at in situ temperature, salinity, and pressure using CO2SYS). Not deployment specific.; Abbreviation: pH^INT_final,1; Unit: pH; Uncertainty: 0.0275 pH units (Spring Data); 0.0159 pH units (Summer Data); Researcher name: Stephen F. Gonski; Researcher institution: University of Delaware, School of Marine Science and Policy (now at: University of Calgary, Department of Geography).
Parameter or Variable: Calibrated pH on the total scale calculated using the Honeywell Durafet's internal reference electrode. Calibrated using pH^disc_elec (pHNBS measured with a glass electrode corrected to pHT at in situ conditions). Not deployment specific.; Abbreviation: pH^INT_final,2; Unit: pH; Uncertainty: 0.0358 pH units (Spring Data); 0.0149 pH units (Summer Data); Researcher name: Stephen F. Gonski; Researcher institution: University of Delaware, School of Marine Science and Policy (now at: University of Calgary, Department of Geography).
Parameter or Variable: Calibrated pH on the total scale calculated using the Honeywell Durafet's external reference electrode. Calibrated using pH^disc_DIC-TA (pH on the total scale calculated from measured DIC and TA at in situ temperature, salinity, and pressure using CO2SYS). Only calibration points of salinity (S) > 14.84 were used as discussed in Gonski et al. (2018). Specific to spring deployment.; Abbreviation: pH^EXT_final,1A; Unit: pH; Uncertainty: 0.0174 pH units; Researcher name: Stephen F. Gonski; Researcher institution: University of Delaware, School of Marine Science and Policy (now at: University of Calgary, Department of Geography).
Parameter or Variable: Calibrated pH on the total scale calculated using the Honeywell Durafet's external reference electrode. Calibrated using pH^disc_DIC-TA (pH on the total scale calculated from measured DIC and TA at in situ temperature, salinity, and pressure using CO2SYS). Only a subset of data above salinity (S) = 20 was used as discussed in Gonski et al. (2018). Specific to spring deployment.; Abbreviation: pH^EXT_final,1B; Unit: pH; Uncertainty: 0.0158 pH units; Researcher name: Stephen F. Gonski; Researcher institution: University of Delaware, School of Marine Science and Policy (now at: University of Calgary, Department of Geography).
Parameter or Variable: Calibrated pH on the total scale calculated using the Honeywell Durafet's external reference electrode. Calibrated using pH^disc_elec (pHNBS measured with a glass electrode corrected to pHT at in situ conditions). Only calibration points of salinity (S) > 14.84 were used as discussed in Gonski et al. (2018). Specific to spring deployment.; Abbreviation: pH^EXT_final,2A; Unit: pH; Uncertainty: 0.0114 pH units; Researcher name: Stephen F. Gonski; Researcher institution: University of Delaware, School of Marine Science and Policy (now at: University of Calgary, Department of Geography).
Parameter or Variable: Calibrated pH on the total scale calculated using the Honeywell Durafet's external reference electrode. Calibrated using pH^disc_elec (pHNBS measured with a glass electrode corrected to pHT at in situ conditions). Only a subset of data above salinity (S) = 20 was used as discussed in Gonski et al. (2018). Specific to spring deployment.; Abbreviation: pH^EXT_final,2B; Unit: pH; Uncertainty: 0.0123 pH units; Researcher name: Stephen F. Gonski; Researcher institution: University of Delaware, School of Marine Science and Policy (now at: University of Calgary, Department of Geography).
Parameter or Variable: Calibrated pH on the total scale calculated using the Honeywell Durafet's external reference electrode. Calibrated using pH^disc_DIC-TA (pH on the total scale calculated from measured DIC and TA at in situ temperature, salinity, and pressure using CO2SYS). Specific to summer deployment.; Abbreviation: pH^EXT_final,1; Unit: pH; Uncertainty: 0.0121 pH units; Researcher name: Stephen F. Gonski; Researcher institution: University of Delaware, School of Marine Science and Policy (now at: University of Calgary, Department of Geography).
Parameter or Variable: Calibrated pH on the total scale calculated using the Honeywell Durafet's external reference electrode. Calibrated using pH^disc_elec (pHNBS measured with a glass electrode corrected to pHT at in situ conditions). Specific to summer deployment.; Abbreviation: pH^EXT_final,2; Unit: pH; Uncertainty: 0.0105 pH units; Researcher name: Stephen F. Gonski; Researcher institution: University of Delaware, School of Marine Science and Policy (now at: University of Calgary, Department of Geography).
Parameter or Variable: Anomalies between values of pH^INT_final and pH^EXT_final. Quantity is equal to pH^INT_final minus pH^EXT_final for a given time stamp; Abbreviation: Del_pH_INT-EXT; Unit: pH; Uncertainty: Not reported; Researcher name: Stephen F. Gonski; Researcher institution: University of Delaware, School of Marine Science and Policy (now at: University of Calgary, Department of Geography).
Parameter or Variable: Calculated pHT of discrete bottle samples collected to gauge intra-deployment conditioning. More specifically, pH on the total scale calculated from measured DIC and TA at in situ temperature, salinity, and pressure using Excel macro CO2SYS (Pierrot et al., 2006) using the inorganic carbon dissociation constants of Millero et al. (2006), the bisulfate ion acidity constant of Dickson (1990), and the boron-to-chlorinity ratio of Lee et al. (2010).; Abbreviation: pH^Cond_DIC-TA; Unit: pH; Uncertainty: Not Reported; Researcher name: Stephen F. Gonski; Researcher institution: University of Delaware, School of Marine Science and Policy (now at: University of Calgary, Department of Geography).
Parameter or Variable: Excess Alkalinity. Difference between measured total alkalinity and alkalinity calculated from measured DIC and pH^field_NBS. The latter value was calculated in the Excel macro CO2SYS (Pierrot et al., 2006) using the norganic carbon dissociation constants of Millero et al. (2006), the bisulfate ion acidity constant of Dickson (1990), and the boron-to-chlorinity ratio of Lee et al. (2010).; Abbreviation: Del_TA; Unit: umol kg-1; Uncertainty: Not reported; Researcher name: Stephen F. Gonski; Researcher institution: University of Delaware, School of Marine Science and Policy (now at: University of Calgary, Department of Geography) .

Acquisition Information (collection)
Instrument	coulometer for DIC measurement pH sensor titrator

Last Modified: 2024-03-08T13:19:17Z
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Measurements of pH, dissolved inorganic carbon, total alkalinity and other variables for the assessment of the suitability of Durafet-based sensors for pH measurement in dynamic estuarine environments (Delaware Bay) from 2016-05-09 to 2016-08-24 (NCEI Accession 0168767)

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