Dataset: Carbonate Chemistry 2014-2017 and 2018-2020

Name: Carbonate chemistry in Mission Aransas Estuary from May 2014 to Feb 2017 and Dec 2018 to Feb 2020
Published: 2021-01-04
Keywords: carbonate chemistry, ocean acidification, Estuary, carbon cycling, oceans

Cite This Dataset

DOI:10.26008/1912/bco-dmo.835227.1

Spatial Extent: N:28.73833 E:-96.8283 S:27.83806 W:-97.2008

Temporal Extent: 2014-05-02 - 2020-02-25

Project:

CAREER: The Impact of Hydrologic State on CO2 Flux and Acidification in Subtropical Estuaries (CO2 Flux and Acidification in Subtropical Estuaries)

Principal Investigator:

Xinping Hu (Texas A&M, Corpus Christi, TAMU-CC)

Scientist:

Melissa R. McCutcheon (Texas A&M, Corpus Christi, TAMU-CC)

BCO-DMO Data Manager:

Dana Stuart Gerlach (Woods Hole Oceanographic Institution, WHOI BCO-DMO)

Version:

Version Date:

2021-01-04

Restricted:

Validated:

Yes

Current State:

Final no updates expected

Carbonate chemistry in Mission Aransas Estuary from May 2014 to Feb 2017 and Dec 2018 to Feb 2020

Abstract:

The Ecosystem Science and Modeling lab has been collecting water samples from five stations in the Mission-Aransas Estuary (MAE, Northwest Gulf of Mexico, Texas coast) for carbonate system characterization on a monthly to twice monthly basis since May 2014. This dataset includes temperature, salinity, dissolved inorganic carbon (DIC), total alkalinity (TA), calcium, and pH measurements from surface and bottom water samples in MAE from May 2014 – Feb 2017 and Dec 2018 – Feb 2020. Additional data for this estuary to fill in the Feb 2017 – Dec 2018 gap are also archived with BCO-DMO (http://www.bco-dmo.org/dataset/784673, doi:10.1575/1912/bco-dmo.784673.1).

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Archival Copy

Version Date	Archive	Persistent Identifier (PID)	Date PID Issued
2021-01-04	Marine Biological Laboratory/Woods Hole Oceanographic Institution Library (MBLWHOI DLA)	10.26008/1912/bco-dmo.835227.1	2021-01-28

Methods & Sampling

Samples were collected every two weeks (March-October) or monthly (November-February) using Mission-Aransas National Estuarine Research Reserve Small Boat. Water samples from both the surface (~0.5 meters) and the bottom of the water column (within 0.5 m from the sediment-water interface) were obtained using a Van Dorn water sampler.

Data Processing Description

Following the standard ocean acidification operating protocol, unfiltered water samples were collected in 250 mL borosilicate glass bottles for carbonate system characterization. 100 µL saturated mercuric chloride (HgCl2) was added into the sample bottles and bottle stoppers were replaced after the application of Apiezon® L grease and secured with a rubber band and hose clamp. These preserved samples were used for salinity, total alkalinity (TA), total dissolved inorganic carbon (DIC), and pH analyses within two months of sample collection.

In-situ temperatures at both the surface (~0.5 m) and the bottom of the water column (within 0.5 m from the sediment-water interface) were obtained using a calibrated YSI 6920 multisonde. Salinity was measured using a benchtop salinometer (Orion Star™ A12, Thermo Scientific) which was calibrated using MilliQ and known salinity certified reference material (CRM). Total Alkalinity (TA) was analyzed at 22±0.1°C using Gran titration on an automated titration system (AS-Alk2, Apollo Scitech Inc.). DIC was analyzed using infrared detection on an AS-C3 DIC analyzer (Apollo Scitech Inc.). Certified reference material was used to ensure the quality of the analysis and optimal performance of the instruments. Total scale pH for salinity ≥20 samples was measured on a spectrophotometer at 25°C using purified m-cresol purple. The equation in Liu et al. (2011) was used in the calculation of pH values. For low salinity waters (<20) prior to September 28th, 2017, a potentiometric method was used to measure pH. An Orion® Ross™ high precision glass electrode was used and three pH standards (4.01, 7.00, and 10.01) were used to calibrate the electrode. Beginning September 28th, 2017, the low salinity samples were also run on the spectrophotometer, and the Douglas and Byrne (2017) equation was used to calculate pH on total scale. Calcium concentration ([Ca2+]) was measured (from non-preserved water samples) using an automatic titration with an ethylene glycol tetraacetic acid (EGTA) titrant on a Metrohm Titrando. The end-point was detected using a Metrohm calcium ion-selective electrode.

Data Files

File
carbonate_chem_data.csv (Comma Separated Values (.csv), 56.37 KB) MD5:adfc590a1e0fcddd5690aad7819f426a Primary data file for dataset ID 835227

More Information about this dataset

Funding Sources

Funding Source	Award Number
NSF Division of Ocean Sciences	OCE-1654232

Deployments

None available yet

Instruments

Apollo SciTech AS-C3 Dissolved Inorganic Carbon (DIC) analyzer

Supplied Name: AS-C3 DIC analyzer, Apollo Scitech Inc

Supplied Description:

Instrument Type

Generic Name: Apollo SciTech AS-C3 Dissolved Inorganic Carbon (DIC) analyzer

Acronym: Apollo SciTech AS-C3

Generic Description:

A Dissolved Inorganic Carbon (DIC) analyzer, for use in aquatic carbon dioxide parameter analysis of coastal waters, sediment pore-waters, and time-series incubation samples. The analyzer consists of a solid state infrared CO2 detector, a mass-flow controller, and a digital pump for transferring accurate amounts of reagent and sample. The analyzer uses an electronic cooling system to keep the reactor temperature below 3 degrees Celsius, and a Nafion dry tube to reduce the water vapour and keep the analyzer drift-free and maintenance-free for longer. The analyzer can handle sample volumes from 0.1 - 1.5 milliliters, however the best results are obtained from sample volumes between 0.5 - 1 milliliters. It takes approximately 3 minutes per analysis, and measurement precision is plus or minus 2 micromoles per kilogram or higher for surface seawater. It is designed for both land based and shipboard laboratory use.

Automatic titrator

Supplied Name: AS-Alk2 alkalinity titrator, Apollo SciTech Inc

Supplied Description:

Instrument Type

Generic Name: Automatic titrator

Community Identifier: http://vocab.nerc.ac.uk/collection/L05/current/LAB12/

Generic Description:

Instruments that incrementally add quantified aliquots of a reagent to a sample until the end-point of a chemical reaction is reached.

Automatic titrator

Supplied Name: Metrohm Titrando 888, calcium ion-selective Titrode

Supplied Description:

Instrument Type

Generic Name: Automatic titrator

Community Identifier: http://vocab.nerc.ac.uk/collection/L05/current/LAB12/

Generic Description:

Instruments that incrementally add quantified aliquots of a reagent to a sample until the end-point of a chemical reaction is reached.

Conductivity Meter

Supplied Name: Orion Star™ A12, Thermo Scientific

Supplied Description:

Orion Star™ A12, Thermo Scientific

Instrument Type

Generic Name: Conductivity Meter

Generic Description:

Conductivity Meter - An electrical conductivity meter (EC meter) measures the electrical conductivity in a solution. Commonly used in hydroponics, aquaculture and freshwater systems to monitor the amount of nutrients, salts or impurities in the water.

Multi Parameter Portable Meter

Supplied Name: YSI 6920 multisonde

Supplied Description:

YSI 6920 multisonde is a multiparameter water quality instrument for real-time or long-term monitoring and profiling of temperature, conductivity, pH, oxidation-reduction potential, dissolved oxygen, and turbidity.

Instrument Type

Generic Name: Multi Parameter Portable Meter

Generic Description:

An analytical instrument that can measure multiple parameters, such as pH, EC, TDS, DO and temperature with one device and is portable or hand-held.

pH Sensor

Supplied Name: Orion® Ross™ glass electrode, Thermo Scientific

Supplied Description:

Orion® Ross™ glass electrode, Thermo Scientific

Instrument Type

Generic Name: pH Sensor

Generic Description:

An instrument that measures the hydrogen ion activity in solutions.

The overall concentration of hydrogen ions is inversely related to its pH. The pH scale ranges from 0 to 14 and indicates whether acidic (more H+) or basic (less H+).

Spectrophotometer

Supplied Name: Agilent 8453 UV-Vis spectrophotometer

Supplied Description:

Instrument Type

Generic Name: Spectrophotometer

Community Identifier: http://vocab.nerc.ac.uk/collection/L05/current/LAB20/

Generic Description:

An instrument used to measure the relative absorption of electromagnetic radiation of different wavelengths in the near infra-red, visible and ultraviolet wavebands by samples.

Van Dorn water sampler

Supplied Name: Van Dorn Beta™ Horizontal Bottle, Aquatic Biotechnology

Supplied Description:

Instrument Type

Generic Name: Van Dorn water sampler

Generic Description:

A free-flushing water sample bottle comprising a cylinder (polycarbonate, acrylic or PVC) with a stopper at each end. The bottle is closed by means of a messenger from the surface releasing the tension on a latex band and thus pulling the two stoppers firmly into place. A thermometer can be mounted inside the bottle. One or more bottles can be lowered on a line to allow sampling at a single or multiple depth levels. Van Dorn samplers are suitable for for physical (temperature), chemical and biological sampling in shallow to very deep water. Bottles are typically lowered vertically through the water column although a horizontal version is available for sampling near the seabed or at thermoclines or chemoclines. Because of the lack of metal parts the bottles are suitable for trace metal sampling, although the blue polyurethane seal used in the Alpha version may leach mercury. The Beta version uses white ASA plastic seals that do not leach mercury but are less durable.

Parameters

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

Supplied Name	Supplied description	Supplied Units	Standard Name
ISO_Date	Sampling date in ISO date format Format: %Y-%m-%d	yyyy-mm-dd	date
Latitude	Latitude of sample collection, South is negative	degrees North	lat
Longitude	Longitude of sample collection, West is negative	degrees East	lon
Station	Station name	unitless	station
Depth	Sample depth	meters (m)	depth
Temperature	Water temperature	degrees Celsius	temperature
Salinity	Salinity	unitless	sal_bot
DIC	Total dissolved inorganic carbon	micromoles per kilogram (umol/kg)	DIC
TA	Total titration alkalinity	micromoles per kilogram (umol/kg)	TALK
Calcium	Calcium	millimoles per kilogram (mmol/kg)	Ca
pH	pH at 25 degrees Celsius	unitless	pH
pH_Label	pH method (1=spectrophotometric, 4=potentiometric)	unitless	sampling_method

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Database

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Dataset: Carbonate Chemistry 2014-2017 and 2018-2020