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Southern Ocean Tipping Point

Page history last edited by PBworks 14 years, 7 months ago

Southern Ocean acidification: A tipping point at 450-ppm atmospheric CO2




1. Ben I. McNeila,1 and


2. Richard J. Matearb


+Author Affiliations


1. aClimate Change Research Centre, Faculty of Science, University of New South Wales, Sydney NSW 2052, Australia; and


2. bCentre for Australian Weather and Climate Research and Antarctic Climate & Ecosystems Cooperative Research Centre, Hobart TAS 7000, Australia


1. Edited by David M. Karl, University of Hawaii, Honolulu, HI, and approved October 6, 2008 (received for review July 1, 2008)




Southern Ocean acidification via anthropogenic CO2 uptake is expected to be detrimental to multiple calcifying plankton species by lowering the concentration of carbonate ion (CO32−) to levels where calcium carbonate (both aragonite and calcite) shells begin to dissolve. Natural seasonal variations in carbonate ion concentrations could either hasten or dampen the future onset of this undersaturation of calcium carbonate. We present a large-scale Southern Ocean observational analysis that examines the seasonal magnitude and variability of CO32− and pH. Our analysis shows an intense wintertime minimum in CO32−south of the Antarctic Polar Front and when combined with anthropogenic CO2uptake is likely to induce aragonite undersaturation when atmospheric CO2 levels reach ≈450 ppm. Under the IPCC IS92a scenario, Southern Ocean wintertime aragonite undersaturation is projected to occur by the year 2030 and no later than 2038. Some prominent calcifying plankton, in particular the Pteropod speciesLimacina helicina, have important veliger larval development during winter and will have to experience detrimental carbonate conditions much earlier than previously thought, with possible deleterious flow-on impacts for the wider Southern Ocean marine ecosystem. Our results highlight the critical importance of understanding seasonal carbon dynamics within all calcifying marine ecosystems such as continental shelves and coral reefs, because natural variability may potentially hasten the onset of future ocean acidification.

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