Dataset: pH internal Consistency Experiment: Measured pH and nutrients

Name: Measured pH and nutrient data acquired during the pH internal consistency experiment.
Published: 2023-08-01
Keywords: ocean acidification, CO2 internal consistency, CO2sys, oceans

Cite This Dataset

DOI:10.26008/1912/bco-dmo.905357.1

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:

2023-08-01

Restricted:

Validated:

Yes

Current State:

Final no updates expected

Measured pH and nutrient data acquired 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
2023-08-01	Marine Biological Laboratory/Woods Hole Oceanographic Institution Library (MBLWHOI DLA)	10.26008/1912/bco-dmo.905357.1	2023-08-02

Methods & Sampling

This table is a summary table of the pH internal consistency experiment, averaging raw values from related datasets.

Measured total alkalinity and measured DIC are averages from the related dataset "pH internal Consistency Experiment: TA & DIC".

The measured pHt are average pHt for each temperature. Values were extrapolated to zero indicator added as described in Woosley 2021 and Woosley and Moon 2023. Raw measurements can be found in the related datatset "pH internal Consistency Experiment: Raw pH Data".

Data Processing Description

Reactive phosphate and silicate for each batch was determined spectrophotometrically using the methods of Strickland and Parsons (1972) modified according to the protocols of NOAA NCEI (Intergovernmental Oceanographic Commission,1994, see related publications). Measurements were made in triplicate and averaged.

The pCO2 of each batch was monitored from the outflow gas during bottling using a LiCor 865. The value is the average (at room temperature) during bottling. Standard Operating Procedures were NOT followed and the accuracy of the values is unknown. They are provided for reference only and not intended for use in calculations.

BCO-DMO Processing

* Adjusted headers to comply with database requirements

Data Files

File
905357_v1_measuredph.csv (Comma Separated Values (.csv), 18.30 KB) MD5:4ac14585e23ec70b171225bb18302995 Primary datafile for dataset 905357

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
Temp	Temperature	degrees Celsius (˚C)	temperature
meas_pHt	measured pH on the total scale	unitless	pH
pHt_std_err	standard error of pHt	unitless	std_err
meas_TA	measured total alkalinity	micromoles per kilogram (µmol/kg)	TALK
TA_std	standard deviation of total alkalinity	micromoles per kilogram (µmol/kg)	std_err
meas_DIC	measured dissolved inorganic carbon	micromoles per kilogram (µmol/kg)	DIC
DIC_std	standard deviation of Dissolved inorganic carbon	micromoles per kilogram (µmol/kg)	std_err
equilibrator_pCO2	aproximate batch pCO2	microatmospheres (µatm)	pCO2
PO4	reactive phosporus	micromoles per kilogram (µmol/kg)	PO4
PO4_stdev	standard deviation of reactive phosphorus	micromoles per kilogram (µmol/kg)	std_err
Si	reactive silicate	micromoles per kilogram (µmol/kg)	Si
Si_stdev	standard deviatin of reactive silicate	micromoles per kilogram (µmol/kg)	std_err