Dataset: pH internal Consistency Experiment: TA & DIC

Name: Total alkalinity and dissolved inorganic carbon data measured during the pH internal consistency experiment.
Published: 2023-07-31
Keywords: ocean acidification, CO2 internal consistency, CO2sys, oceans

Cite This Dataset

DOI:10.26008/1912/bco-dmo.905278.1

Spatial Extent: N:39.773433 E:-70.884417 S:39.773433 W:-70.884417

Temporal Extent: 2019-10-10

Project:

Improving Accuracy and Precision of Marine Inorganic Carbon Measurements (Inorganic Carbon Meaurements)

Principal Investigator:

Ryan Woosley (Massachusetts Institute of Technology, MIT)

Contact:

Ryan Woosley (Massachusetts Institute of Technology, MIT)

BCO-DMO Data Manager:

Karen Soenen (Woods Hole Oceanographic Institution, WHOI BCO-DMO)

Version:

Version Date:

2023-07-31

Restricted:

Validated:

Yes

Current State:

Final no updates expected

Total alkalinity and dissolved inorganic carbon data measured during the pH internal consistency experiment.

Abstract:

These data include the measured pHt, total alkalinity, dissolved inorganic carbon, raw pHt absorbance, and calculated pHt of 25 batches of seawater as a function of temperature, salinity, and pCO2. These data were used to evaluate the internal consistency of 120 different possible combinations of CO2 system constants. The marine inorganic carbon system can be calculated with two measured parameters due to thermodynamic relationships. However, there are many different parameterizations for the required constants and the most accurate or best is not known. These data were used to evaluate the constants and make recommendations for which constants to use, and how to perform CO2 system calculations.

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Archival Copy

Version Date	Archive	Persistent Identifier (PID)	Date PID Issued
2023-07-31	Marine Biological Laboratory/Woods Hole Oceanographic Institution Library (MBLWHOI DLA)	10.26008/1912/bco-dmo.905278.1	2023-08-02

Methods & Sampling

Oligotrophic Atlantic surface seawater was collected from 39° 46.406′ N and 70° 53.065′ W on October 10, 2019.

The surface seawater was modified to five different salinities and 5 different pCO2 values for a total of 25 batches. Salinity was modified through dilution or evaporation. pCO2 was modified by bubbling CO2 gas of different pCO2 concentrations (balance air).

The water was then bottled and sealed into 250 mL borosilicate glass bottles following SOPs (Dickson et al. 2007). Each batch consisted of 44 bottles.

Data Processing Description

Total Alkalinity was measured by open cell HCl titration following SOP (Dickson et al. 2007)

Dissolved inorganic carbon was measured by coulometry following SOP (Dickson et al. 2007)

Data Files

File
905278_v1_ta_dic.csv (Comma Separated Values (.csv), 2.41 KB) MD5:bb79044f2152c9c697f2ca4478c04c89 Primary datafile for dataset 905278.

More Information about this dataset

Funding Sources

Funding Source	Award Number
NSF Division of Ocean Sciences	OCE-1923312

Deployments

None available yet

Instruments

None available yet

Parameters

Date and time formats are described in python strftime() syntax.

Supplied Name	Supplied description	Supplied Units	Standard Name
Batch	Seawater batch number	unitless	sample
Practical_Salinity	Salinity	unitless	sal
meas_TA	measured total alkalinity	micromoles per kilogram (µmol/kg)	TALK
meas_DIC	measured dissolved inorganic carbon	micromoles per kilogram (µmol/kg)	DIC