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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title: 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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abstract: 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.
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.
credit: Funding Information: University of Delaware Provost's Office and the College of Earth (Delaware Sea Grant award (HCE-23), SMSP175136)
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linkage: https://www.ncei.noaa.gov/data/oceans/ncei/ocads/metadata/0168767.html
protocol: HTTPS
applicationProfile: Web browser
name: Project Metadata
description: Navigate directly to the URL for a descriptive web page with download links.
function: (CI_OnLineFunctionCode) information
onLine: (CI_OnlineResource)
linkage: https://doi.org/10.7289/v5zp44d7
protocol: HTTPS
applicationProfile: Web browser
name: NCEI Dataset Landing Page
description: Navigate directly to the URL for a descriptive web page with download links.
function: (CI_OnLineFunctionCode) information
onLine: (CI_OnlineResource)
linkage: https://www.ncei.noaa.gov/archive/accession/oas/168767
protocol: HTTPS
applicationProfile: Web browser
name: Descriptive Information
description: Navigate directly to the URL for a descriptive web page with download links.
function: (CI_OnLineFunctionCode) information
onLine: (CI_OnlineResource)
linkage: https://www.ncei.noaa.gov/archive/accession/download/168767
protocol: HTTPS
applicationProfile: Web browser
name: HTTPS
description: Navigate directly to the URL for data access and direct download.
function: (CI_OnLineFunctionCode) download
onLine: (CI_OnlineResource)
linkage: ftp://ftp-oceans.ncei.noaa.gov/nodc/archive/arc0114/0168767/
protocol: FTP
applicationProfile: Any FTP client
name: FTP
description: These data are available through the File Transfer Protocol (FTP). FTP is no longer supported by most internet browsers. You may copy and paste the FTP link to the data into an FTP client (e.g., FileZilla or WinSCP).
function: (CI_OnLineFunctionCode) download
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dataQualityInfo: (DQ_DataQuality)
scope: (DQ_Scope)
level: (MD_ScopeCode) dataset
lineage: (LI_Lineage)
processStep: (LE_ProcessStep)
description: NCEI Accession 0168767 v1.1 was published.
dateTime:
DateTime: 2017-12-12T02:45:05Z
output: (LE_Source)
sourceCitation: (CI_Citation)
title: NCEI Accession 0168767 v1.1
date: (CI_Date)
date: (inapplicable)
dateType: (CI_DateTypeCode) publication
citedResponsibleParty: (CI_ResponsibleParty)
individualName: (inapplicable)
contactInfo: (CI_Contact)
onlineResource: (CI_OnlineResource)
linkage: https://www.ncei.noaa.gov/archive/accession/0168767/1.1
protocol: HTTPS
name: NCEI Accession 0168767 v1.1
description: published 2017-12-12T02:45:05Z
function: (CI_OnLineFunctionCode) download
role: (inapplicable)
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dataQualityInfo: (DQ_DataQuality)
scope: (DQ_Scope)
level: (MD_ScopeCode) dataset
lineage: (LI_Lineage)
processStep: (LE_ProcessStep)
description: 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).
processStep: (LE_ProcessStep)
description: 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).
processStep: (LE_ProcessStep)
description: 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).
processStep: (LE_ProcessStep)
description: 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).
processStep: (LE_ProcessStep)
description: 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).
processStep: (LE_ProcessStep)
description: 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).
processStep: (LE_ProcessStep)
description: 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).
processStep: (LE_ProcessStep)
description: 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).
processStep: (LE_ProcessStep)
description: 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).
processStep: (LE_ProcessStep)
description: 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).
processStep: (LE_ProcessStep)
description: 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).
processStep: (LE_ProcessStep)
description: 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.
processStep: (LE_ProcessStep)
description: 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).
processStep: (LE_ProcessStep)
description: 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).
processStep: (LE_ProcessStep)
description: 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).
processStep: (LE_ProcessStep)
description: 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).
processStep: (LE_ProcessStep)
description: 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).
processStep: (LE_ProcessStep)
description: 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).
processStep: (LE_ProcessStep)
description: 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).
processStep: (LE_ProcessStep)
description: 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).
processStep: (LE_ProcessStep)
description: 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).
processStep: (LE_ProcessStep)
description: 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).
processStep: (LE_ProcessStep)
description: 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).
processStep: (LE_ProcessStep)
description: 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).
processStep: (LE_ProcessStep)
description: 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).
processStep: (LE_ProcessStep)
description: 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).
processStep: (LE_ProcessStep)
description: 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).
processStep: (LE_ProcessStep)
description: 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).
processStep: (LE_ProcessStep)
description: 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) .
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metadataMaintenance: (MD_MaintenanceInformation)
maintenanceAndUpdateFrequency: (MD_MaintenanceFrequencyCode) asNeeded
maintenanceNote: Metadata are developed, maintained and distributed by NCEI. Updates are performed as needed to maintain currentness.
contact: (CI_ResponsibleParty)
organisationName: NOAA National Centers for Environmental Information
role: (CI_RoleCode) custodian
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acquisitionInformation: (MI_AcquisitionInformation)
instrument: (MI_Instrument)
identifier: (MD_Identifier)
code: coulometer for DIC measurement
type: coulometer for DIC measurement
description: measures dissolved inorganic carbon (DIC) A known amount of seawater is dispensed into a stripping chamber where it is acidified and purged with an inert gas. The amount of CO2 in the resulting gas stream is determined by absorbing the CO2 in an absorbent. The pH of the solution is monitored by measuring the transmittance .
instrument: (MI_Instrument)
identifier: (MD_Identifier)
code: pH sensor
type: pH sensor
description: generic meter used to measure pH Any of a class of instruments used to quantify pH in a water or other type of sample.
instrument: (MI_Instrument)
identifier: (MD_Identifier)
code: titrator
type: titrator
description: titrator
