Ocean Acidification and Dissolved Carbon Dioxide Sensors - Davies Reef CO2/pH

• Other Authors: Australian Institute of Marine Science (AIMS) (publisher), Australian Institute of Marine Science (AIMS) (owner), Australian Institute of Marine Science (AIMS) (hasPrincipalInvestigator), Australian Institute of Marine Science (AIMS) (distributor), Australian Institute of Marine Science (pointOfContact)
• Format: Dataset
• Language: unknown
• Published: Australian Institute of Marine Science
• Subjects: oceans; Ferguson; Joy Point; Ocean acidification
• Online Access: https://researchdata.ands.org.au/ocean-acidification-dissolved-reef-co2ph/677600; http://apps.aims.gov.au/metadata/view/603c548f-883d-4895-9052-c020efcc23c1; http://www.barrierreef.org/

The Australian Institute of Marine Science (AIMS) maintains a weather station tower at Davies Reef east of Townsville in the great barrier reef. Measurements of near-surface ocean acidity (pH), dissolved carbon dioxide (pCO2) and dissolved oxygen (DO) are taken from instrumentation mounted on a buoy adjacent to the weather station tower. All data records include sampling time (UCT), position (Latitude, Longitude). The data is records in near real time using a microwave communications link back to AIMS at Cape Ferguson. \n \nData are recorded at 10 minute intervals for DO and pH, 3 hourly for pCO2. The sampling intakes are located at depths of 1.9m. The data is ingested in near real time by the AIMS Data Centre via the Real Time Data System (RTDS). Components of the RTDS also provide visualisation techniques like charting services, mapping services, and download services where appropriate.\n The purpose for collecting this data can be summarised as follows. \n1. To document anthropogenic changes in pH and aragonite saturation state as a result of ocean acidification. \n2. To determine key biogeochemical processes that affect the resilience of the Great Barrier Reef shelf to ocean acidification and to pinpoint areas of high and low resilience to ocean acidification.\n Calibration and Servicing is a necessary component for obtaining quality data sets. A spare pH sensor is calibrated at AIMS and rotated into the buoy on a regular basis. Each pH probe is recalibrated on its return to AIMS, the pre-calibration values providing a check of the probe stability and allowing for calibration correction factors to be calculated. The Battelle pCO2 system has an internal WMO standard gas which calibrates the instrument prior to each 3 hourly reading of the seawater and air. The DO instrument is factory calibrated every 6 months. \n \nThe CO2 gas equilibration device (GED), is inspected during monthly visits and swabbed to remove algae or other contaminants. A shutter on the DO instrument opens for readings and remains closed for the intervals between measurements, keeping the optical aperture surface very clean.\n John Pfitzner Fabricius, Katharina E, Dr (Principal Investigator) Smith, Joy (Point Of Contact) Statement: See each of the sub-components for details of the quality control for that data. \n