Dataset: Carbonate data from water samples
Deployment: NA028

Water samples from CTD casts and vehicle-mounted bottles from 4 cruises.

Principal Investigator:

Erik E. Cordes (Temple University, Temple)

Co-Principal Investigator:

Dr Robert J. Kulathinal (Temple University, Temple)

Contact:

Erik E. Cordes (Temple University, Temple)

BCO-DMO Data Manager:

Hannah Ake (Woods Hole Oceanographic Institution, WHOI BCO-DMO)

Project:

Physiological and genetic responses of the deep-water coral, Lophelia pertusa, to ongoing ocean acidification in the Gulf of Mexico (Lophelia OA)

Current State:

Final no updates expected

Version:

Final

Version Date:

2016-09-19

Data URL:

https://www.bco-dmo.org/dataset-deployment/659018/data

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Description

Water samples from CTD casts and vehicle-mounted bottles collected on the Atlantis, GOMRI, Nautilus, Ronald Brown, and Schmidt between 2010 and 2014.

Methods & Sampling

Dataset acquisition description

pH was measured on the total hydrogen scale (pHT) within one hour of sample collection. Each water sample was placed in a 25 degrees C water bath for 10–20 minutes to standardize temperature (mean temperature over all pH measurements of 22.2 +/- 2.6 degrees C). pHT was then measured in duplicate using the Orion 5 Star pH meter and glass electrode (ROSS Ultra pH/ATC Triode 8107BNUMD) calibrated with Tris–HCL buffer solution obtained from the Dickson Lab (Batch 22). Electrode performance was regularly checked against standard Tris-HCl and AMP-HCl buffers in artificial seawater (Nemzer et al. 2005; Dickson et al. 2007). Temperature was measured using the integrated temperature sensor on the ROSS Ultra pH/ATC Triode from 2010–2013, and using a handheld thermocouple (Omega HH81A) in 2014. Total alkalinity (TA) was measured in triplicate by acid titration on a Mettler–Toledo DL15 autotitrator using 0.1 mol L–1 HCl buffered in 0.6 mol L–1 NaCl (modified from SOP 3b, Dickson et al. 2007). The autotitrator was calibrated daily on the NBS scale using certified reference buffers (Orion), and certified reference materials (Dickson Lab, batches 138 and 141) were measured periodically to ensure accuracy (within +/- 10 umol kg-1).

Data Processing Description

Dataset Processing Description

CO2SYS software (Pierrot et al. 2006) was used to correct pHT values for in situ temperature and pressure, and to calculate the entire carbonate system from TA, pHT, temperature, salinity, and pressure. For all calculations, we used the carbonic acid constants (K1 and K2) of Mehrbach et al. (1973) refitted by Dickson and Millero (1987), and the aragonite solubility product (Ksp) from Mucci (1983). The effects of nutrients (phosphate and silicate) on the carbonate system were assumed to be negligible (eg. Cai 2003; Yates and Halley 2006). TA and dissolved inorganic carbon (DIC) values were corrected for in situ salinity values using the mean salinity of all sites (35.3 psu) to yield salinity-normalized TA (nTA) and DIC (nDIC).

BCO-DMO Processing Notes:

-Column names reformatted to comply with BCO-DMO standards
-Entered "nd" into blank cells
-Created a separate column for official cruise identification in addition to the PI supplied cruise name

More information about this dataset deployment

Funding

Award Number	Funding Source
OCE-1220478	NSF Division of Ocean Sciences

Instruments

Aquarium

Supplied Description:

Experiments conducted using aquaria

Instrument Type

Generic Name: Aquarium

Generic Description:

Aquarium - a vivarium consisting of at least one transparent side in which water-dwelling plants or animals are kept

Automatic titrator

Supplied Name: Mettler-Toledo EL15 autotitrator

Supplied Description:

Measured total alkalinity

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.

Bottle

Supplied Name: Vehicle mounted bottle

Supplied Description:

Water samples collected by vehicle-mounted bottle

Instrument Type

Generic Name: Bottle

Generic Description:

A container, typically made of glass or plastic and with a narrow neck, used for storing drinks or other liquids.

CTD - profiler

Supplied Name: CTD

Supplied Description:

Water samples taken from CTD casts

Instrument Type

Generic Name: CTD - profiler

Community Identifier: http://vocab.nerc.ac.uk/collection/L05/current/130/

Generic Description:

The Conductivity, Temperature, Depth (CTD) unit is an integrated instrument package designed to measure the conductivity, temperature, and pressure (depth) of the water column. The instrument is lowered via cable through the water column. It permits scientists to observe the physical properties in real-time via a conducting cable, which is typically connected to a CTD to a deck unit and computer on a ship. The CTD is often configured with additional optional sensors including fluorometers, transmissometers and/or radiometers. It is often combined with a Rosette of water sampling bottles (e.g. Niskin, GO-FLO) for collecting discrete water samples during the cast.

This term applies to profiling CTDs. For fixed CTDs, see https://www.bco-dmo.org/instrument/869934.

pH Sensor

Supplied Name: Orion 5 Star pH themeter

Supplied Description:

pHT was measured using this instrument

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+).

Water Temperature Sensor

Supplied Name: Temperature sensor

Supplied Description:

Sensor that measured water temperature

Instrument Type

Generic Name: Water Temperature Sensor

Acronym: Water Temp Sensor

Community Identifier: http://vocab.nerc.ac.uk/collection/L05/current/134/

Generic Description:

General term for an instrument that measures the temperature of the water with which it is in contact (thermometer).

Parameters

Supplied Name	Supplied description	Supplied Units	Standard Name
cruise_name	Project investigator's cruise name	unitless	cruise_name
instrument	Instrument used to collect water samples; V (vehicle-mounted bottle) or CTD	unitless	instrument
measurement_location	Location where water sample was taken; WC= water column or B= bottom	unitless	sample_type
sample_ID	Sample ID number	unitless	sample
year	Year of sample; YYYY	unitless	year
lat	Latitude	decimal degrees	lat
lon	Longitude	decimal degrees	lon
site	Site code where sample was taken; see lat/lons for exact location.	unitless	site
depth	Depth at which sample was taken	meters	depth
salinity	Salinity of water sample	practical salinity units (PSU)	sal
pressure	Pressure at depth	decibar (dbar)	press
temperature	Temperature at depth	celsius	temperature
measured_temp	Temperature of sample after being standardized in 25 degree celsius water bath for 10-20 minutes.	celsius	temp
input_pH	pH measurement of sample (total scale)	total pH scale	pH
TA	Total alkalinity of sample	micromoles per killigram (umol/kg)	TALK
nTA	Salinity normalized total alkalinity	micromoles per killigram (umol/kg)	TALK
pHT	pH measured on the total hydrogen scale	total pH scale	pH
omega_aragonite	saturation state of aragonite	unitless	OM_ar
DIC	Dissolved inorganic carbon values	micromoles per killigram (umol/kg)	DIC
pCO2	Carbond dioxide concentration	microatomospheres (uatm)	pCO2
revelle_factor	A measure inversely proportional to the capacity for seawater to absorb atmospheric CO2	unitless	no_bcodmo_term
bicarbonate_ion	Bicarbonate ion concentration	micromoles per killigram (umol/kg)	bicarbonate
carbonate_ion	Carbonate ion concentration	micromoles per killigram (umol/kg)	carbonate
TA_DIC	Total alkalinity and dissolved inorganic carbon ratio	unitless	no_bcodmo_term
comments	Comments	unitless	comment
cruise_id	Official cruise identification	unitless	cruise_id
month	Month of sampling; MM	unitless	month
day	Day of sampling; DD		day

Database

Contribute Data

Dataset: Carbonate data from water samples
Deployment: NA028

Dataset acquisition description

Dataset Processing Description

Database

Contribute Data

Dataset: Carbonate data from water samplesDeployment: NA028

Dataset acquisition description

Dataset Processing Description

Dataset: Carbonate data from water samples
Deployment: NA028