Dataset: Heron Reef Carbonate Chemistry

Name: Spatial surveys of carbonate chemistry in Heron Reef, Great Barrier Reef, Australia
Published: 2021-02-01
Keywords: oceans

Cite This Dataset

DOI:10.26008/1912/bco-dmo.839261.1

Spatial Extent: N:-23.4369 E:151.9925 S:-23.4691 W:151.9067

Temporal Extent: 2015-10-12 - 2015-10-14

Project:

CAREER: Biogeochemical Modification of Seawater CO2 Chemistry in Near-Shore Environments: Effect of Ocean Acidification (Nearshore CO2)

Principal Investigator:

Andreas Andersson (University of California-San Diego, UCSD-SIO)

Scientist:

Tyler Cyronak (University of California-San Diego, UCSD-SIO)

Student:

Samuel Kekuewa (University of California-San Diego, UCSD-SIO)

BCO-DMO Data Manager:

Shannon Rauch (Woods Hole Oceanographic Institution, WHOI BCO-DMO)

Version:

Version Date:

2021-02-01

Restricted:

Validated:

Yes

Current State:

Final no updates expected

Spatial surveys of carbonate chemistry in Heron Reef, Great Barrier Reef, Australia

Abstract:

Seawater samples and environmental measurements were collected across the Heron Island coral reef during three reef-scale surveys in the morning and evening in October of 2015. Seawater samples were analyzed for dissolved inorganic carbon chemistry parameters. The study was designed to characterize the natural spatio-temporal variability of carbonate chemistry and environmental parameters across the entire coral reef system. The spatial surveys were complemented with autonomous sensors making high frequency measurements at three locations.

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Archival Copy

Version Date	Archive	Persistent Identifier (PID)	Date PID Issued
2021-02-01	Marine Biological Laboratory/Woods Hole Oceanographic Institution Library (MBLWHOI DLA)	10.26008/1912/bco-dmo.839261.1	2022-11-15

Methods & Sampling

General study design:
Seawater samples and environmental measurements were collected across the Heron Island coral reef during three reef-scale surveys in the morning and evening in October of 2015. Seawater samples were analyzed for dissolved inorganic carbon chemistry parameters. The study was designed to characterize the natural spatio-temporal variability of carbonate chemistry and environmental parameters across the entire coral reef system. The spatial surveys were complemented with autonomous sensors making high frequency measurements at three locations.

Methods description:
Seawater samples for carbonate chemistry analysis were collected from 0.5 m depth using a bucket and line at 28 stations inside the Heron reef lagoon and 1 station outside of the reef. Seawater samples were collected in 250 ml Pyrex Corning glass bottle and immediately poisoned with 100 μL HgCL₂ following standard protocols (Dickson et al., 2007). Seawater temperature, salinity, and dissolved oxygen were also measured at each sampling location using a handheld YSI multiprobe. Each survey took approximately 2 hours to complete.

Analytical Methods:
All seawater samples were transported to the Scripps Coastal and Open Ocean Biogeochemistry lab and analyzed for TA via an open-cell potentiometric acid titration system developed at Scripps Institution of Oceanography (SIO) by A. Dickson (Dickson et al. 2007) and DIC via an automated infra-red inorganic carbon analyzer (AIRICA, Marianda Inc).

Quality Control:
Samples for seawater carbon chemistry analysis were collected and analyzed following standard protocol (Dickson et al., 2007). The handheld YSI multiprobe was calibrated prior to each survey with and accuracy of ±0.2°C for temperature and 1% for salinity. The accuracy and precision for DIC and TA samples were - 0.86 ± 1.78 and 1.37 ± 2.79, respectively and were evaluated using CRMs provided by the laboratory of A. Dickson at SIO. CRMs were analyzed every 5 samples for DIC and every 10 for TA.

Data Processing Description

Data Processing:
Measured TA, DIC, temperature and salinity were input into CO2SYS for MATLAB (version 2.1) in order to calculate pCO2, pH, and Ar.

BCO-DMO Processing:
-added UTC date/time field in ISO8601 format;
- converted latitude values from positive to negative.

Data Files

File
heron_reef.csv (Comma Separated Values (.csv), 9.82 KB) MD5:b9fb12dc18ab2ff16129f95cf5f0f1a3 Primary data file for dataset ID 839261

More Information about this dataset

Funding Sources

Funding Source	Award Number
NSF Division of Ocean Sciences	OCE-1255042

Deployments

Deployment	Synonyms	Start Date	Platform	Investigator
Andersson_Heron_Island_2015-10		2015-10-12	Small Boat	Andreas Andersson (Chief Scientist)	data info

Instruments

Automatic titrator

Supplied Name: Open-cell potentiometric acid titrator

Supplied Description:

The open-cell potentiometric acid titration system was developed by the laboratory of A.G. Dickson. Briefly, a known amount of seawater is added to an open cell temperature controlled beaker. Hydrochloric acid (0.1 N) is added using a Methrom Dosimat to a pH of 3.5-4.0. Following equilibration, small increments of hydrochloric acid are then added to the seawater until pH equals ~ 3.0. The titration is monitored by a glass electrode and the total alkalinity of the sample is calculated using a non-linear least-squares method following Dickson et al. (2007).

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.

Inorganic Carbon Analyzer

Supplied Name: AIRICA (Marianda)

Supplied Description:

The Automated Infra Red Inorganic Carbon Analyzer (AIRICA) utilizes infrared detection of CO2 gas purged from an acidified seawater sample. A pump extracts the seawater sample, acidifies the sample with phosphoric acid, and analyzes the gas released with an infrared light analyzer (LICOR). The CO2 signal is integrated for four individual peaks for each sample and the three closest integrated peaks are averaged for a single given sample.

Instrument Type

Generic Name: Inorganic Carbon Analyzer

Generic Description:

Instruments measuring carbonate in sediments and inorganic carbon (including DIC) in the water column.

Water Quality Multiprobe

Supplied Name: YSI Professional Plus handheld multi-parameter instrument (YSI 6600 V2)

Supplied Description:

The instrument was used to measure in situ temperature (±0.2°C), salinity (± 1%), and DO (both mg/L and %; ± 2%).

Instrument Type

Generic Name: Water Quality Multiprobe

Generic Description:

An instrument which measures multiple water quality parameters based on the sensor configuration.

Parameters

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

Supplied Name	Supplied description	Supplied Units	Standard Name
Sample	Sample number for reference	unitless	sample
Time	Date of the survey in local time (AEST); format: mm/dd/yyyy HH:mm Format: %m/%d/%y %H:%M	unitless	time
ISO_DateTime_UTC	Date and time of the survey in UTC; format: YYYY-MM-DDThh:mmZ Format: %Y-%m-%dT%H:%MZ	unitless	ISO_DateTime_UTC
Station	Station number for reference	unitless	station
Survey_Number	Survey number for reference	unitless	site_descrip
Lat	Latitude of survey station	degrees North	lat
Long	Longitude of survey station	degrees East	lon
T	Temperature of seawater	degrees Celsius	temp
S	Salinity of seawater	PSU	sal
DO_mg	Dissolved oxygen of seawater	milligrams per liter (mg/L)	O2
DO	Dissolved oxygen of seawater	micromoles per kilogram (umol/kg)	O2
DIC	Dissolved inorganic carbon of seawater	micromoles per kilogram (umol/kg)	DIC
TA	Total alkalinity of seawater	micromoles per kilogram (umol/kg)	TALK
pCO2	pCO2 of seawater	microatmospheres (uatm)	pCO2
Ar	Aragonite saturation state of seawater	unitless	OM_ar
pH	pH of seawater	unitless	pH

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Dataset: Heron Reef Carbonate Chemistry