Assessing the potential of calcium-based artificial ocean alkalinization to mitigate rising atmospheric CO2and ocean acidification


Contact
Dieter.Wolf-Gladrow [ at ] awi.de

Abstract

Enhancement of ocean alkalinity using calcium compounds, e.g., lime has been proposed to mitigate further increase of atmospheric CO2 and ocean acidification due to anthropogenic CO2 emissions. Using a global model, we show that such alkalinization has the potential to preserve pH and the saturation state of carbonate minerals at close to today’s values. Effects of alkalinization persist after termination: Atmospheric CO2 and pH do not return to unmitigated levels. Only scenarios in which large amounts of alkalinity (i.e., in a ratio of 2:1 with respect to emitted CO2) are added over large ocean areas can boost oceanic CO2 uptake sufficiently to avoid further ocean acidification on the global scale, thereby elevating some key biogeochemical parameters, e.g., pH significantly above preindustrial levels. Smaller-scale alkalinization could counteract ocean acidification on a subregional or even local scale, e.g., in upwelling systems. The decrease of atmospheric CO2 would then be a small side effect.



Item Type
Article
Authors
Divisions
Primary Division
Programs
Primary Topic
Peer revision
ISI/Scopus peer-reviewed
Publication Status
Published
Eprint ID
34488
DOI 10.1002/2013GL057981

Cite as
Ilyina, T. , Wolf-Gladrow, D. , Munhoven, G. and Heinze, C. (2013): Assessing the potential of calcium-based artificial ocean alkalinization to mitigate rising atmospheric CO2and ocean acidification , Geophysical Research Letters, 40 , pp. 1-6 . doi: 10.1002/2013GL057981


Download
[img]
Preview
PDF
Ilyina13Wolf-Gladrow_Munhoven_Heinze.pdf

Download (1MB) | Preview
Cite this document as:

Share


Citation

Research Platforms
N/A

Campaigns


Actions
Edit Item Edit Item