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Journal of Southern Hemisphere Earth Systems Science Journal of Southern Hemisphere Earth Systems Science SocietyJournal of Southern Hemisphere Earth Systems Science Society
A journal for meteorology, climate, oceanography, hydrology and space weather focused on the southern hemisphere
RESEARCH ARTICLE (Open Access)

Marine Projections of Warming and Ocean Acidification in the Australasian Region

Andrew Lenton, Kathleen L. McInnes and Julian G. O’Grady

Australian Meteorological and Oceanographic Journal 65(1) S1 - S28
Published: 2015

Abstract

In response to increasing carbon dioxide emissions the oceans have become warmer and more acidic. In this paper, the ability of Earth System Models to simulate observed temperature and ocean acidification around Australia is assessed. The model results are also compared with observations collected at stations around Australia over recent years to assess how representative the model results are of the coastal domain; and are found to adequately simulate the mean state at most sites. Simulations from the Coupled Model Intercomparison Project 5 (CMIP5) under low, medium and high emissions scenarios (RCPs 2.6, 4.5 and 8.5 respectively) are then used to project how ocean acidification and sea surface temperature will change. Under each of these emissions scenarios the oceans around Australia exhibit warming and continued acidification. However, these changes are quite heterogeneous, with increases of up to +6 K (under RCP 8.5) above the pre-industrial value, projected in areas such as the Tasman Sea. We conclude that the projected changes in SST, aragonite saturation state and pH are likely to profoundly impact marine ecosystems, and the ecosystem services that they provide in the Australasian region.

https://doi.org/10.1071/ES15012

© Commonwealth of Australia represented by the Bureau of Meterology 2015. This is an open access article distributed under the Creative Commons Attribution-NonCommerical-NoDerivatives 4.0 International License (CC BY-NC-ND).

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