2021 State of the Environment Report Marine Chapter – Expert Assessment – Pressure – Climate Change – Ocean acidification

• Other Authors: CSIRO Oceans and Atmosphere (hasAssociationWith), Department of Agriculture, Water and the Environment (DAWE) (publisher), Emma Flukes (pointOfContact), Lenton, Andrew (author), National Environmental Science Program (NESP) Marine Biodiversity Hub (hasAssociationWith), Tilbrook, Bronte (author)
• Format: Dataset
• Language: unknown
• Published: Australian Ocean Data Network
• Subjects: environment; climatologyMeteorologyAtmosphere; oceans; ocean acidification; climate change; anthropogenic pressures; environmental pressures; expert assessment; Currie; Scripps; Ocean acidification
• Online Access: https://doi.org/10.26198/aft3-gb13; https://researchdata.edu.au/2021-state-environment-ocean-acidification/1698282

Statement: QUALITY OF DATA USED IN THE ASSESSMENT Total dissolved CO2 and total alkalinity data were obtained following procedures outlined in Dickson et al., (2007). Certified reference materials (CRMs) from the Scripps Institution of Oceanography were analysed to determine a ± 2 micromol/kg accuracy and precision of the measurements for both parameters. Oceanic values of pCO2 were taken from an updated version of (Sasse et al., 2013) climatology that used a neural network to map values around Australia on a 1x1 degree grid each month for the year 2000. Credit Peer reviews of this assessment were provided by: Kim Currie (NIWA) The Marine chapter of the 2021 State of the Environment (SoE) report incorporates multiple expert templates developed from streams of marine data. This metadata record describes the Expert Assessment "Pressures on the marine environment - climate change - ocean acidification". ***A PDF of the full Expert Assessment, including figures and tables (where provided) is downloadable in the "On-line Resources" section of this record as "EXPERT ASSESSMENT 2021 - Ocean Acidification"*** --- DESCRIPTION OF PRESSURE Ocean acidification describes changes in dissolved carbonate chemistry resulting from the ocean taking up about 25% of the annual carbon dioxide (CO2) emissions. The changes include decreases in seawater pH and a lowering of the saturation state of aragonite, a major mineral form used by marine organisms to produce shells and skeletal material. The changes are rapid with the pH change being ten-fold greater than at any time in the past 300 million years (Hönisch et al., 2012). Superimposed on the large-scale change is increased variability at seasonal and local scales, particularly in coastal regions (Mongin et al., 2016; Shaw et al., 2012). DATA STREAM(S) USED IN EXPERT ASSESSMENT Offshore data from around Australia as described in Lenton et al. 2016. Lenton, A., B. Tilbrook, R. Matear, T. Sasse and Y. Nojiri (2016) Historical reconstruction of Ocean Acidification in the Australian ...