Acidification of the Arctic ocean will be deprived of shellfish calcium

By 2100, the Arctic ocean is expected to further increase carbon stock from 7.5 ± 2.7 to 9,0 ± 1,6 billion tons. This will cause water acidification and decrease of aragonite and calcite due to their partial dissolution. According to the study, published in the journal Nature, it poses a great danger to marine organisms of calcification that use the minerals of calcium in the life cycle: for example, shellfish.

The ocean absorbs carbon dioxide from the atmosphere, mitigating the effects of global climate change. However, this process does not go unnoticed: as a result of the dissolution of CO2 in sea water becoming more acidic, that is having a direct influence on biogeochemical processes occurring in it. Lower pH affects marine life, including crustaceans, mollusks, echinoderms , and bony fish. Especially sensitive organisms-qualificatorywhich the essential minerals of calcium (aragonite and calcite) for the implementation of lifecycle: in acidic medium, the degree of saturation of these minerals is reduced — they are partially dissolved and are unable to perform protective functions.

Scientists under the leadership of Jens Terharu (Jens Tollefsen) at the University of Sorbonne, made a prediction of ocean acidification in the Arctic ocean, changes its density and saturation relative to the aragonite and calcu finally in the XXI century, using data from 11 hydrochemical models of the Arctic seas. They paid attention to the performance of dissolved inorganic carbon, phosphorus and silicon; total alkalinity, temperature and salinity at different depths. Dynamics of anthropogenic carbon emissions were taken into account in accordance with the scenario RCP8.5.

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