Feng, Ellias Y.; Keller, David P.; Koeve, Wolfgang; Oschlies, Andreas
(2016): Could artificial ocean alkalinization protect tropical coral
ecosystems from ocean acidification? In Environ. Res. Lett. 11 (7), p.
74008–74008. DOI 10.1088/1748-9326/11/7/074008.
http://iopscience.iop.org/article/10.1088/1748-9326/11/7/074008/meta
Abstract
Artificial ocean alkalinization (AOA) is investigated as a method to
mitigate local ocean acidification and protect tropical coral ecosystems
during a 21st century high CO_2 emission scenario. Employing an Earth
system model of intermediate complexity, our implementation of AOA in
the Great Barrier Reef, Caribbean Sea and South China Sea regions, shows
that alkalinization has the potential to counteract expected 21st
century local acidification in regard to both oceanic surface aragonite
saturation Ω and surface pCO_2 . Beyond preventing local acidification,
regional AOA, however, results in locally elevated aragonite
oversaturation and pCO_2 decline. A notable consequence of stopping
regional AOA is a rapid shift back to the acidified conditions of the
target regions. We conclude that AOA may be a method that could help to
keep regional coral ecosystems within saturation states and pCO_2 values
close to present-day values even in a high-emission scenario and thereby
might 'buy some time' against the ocean acidification threat, even
though regional AOA does not significantly mitigate the warming threat.
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