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Time variability of the north-western Mediterranean Sea pH over 1995–2011

Abstract : Factors controlling ocean acidification and its temporal variations were studied over the 1995–2011 period at the Dyfamed site at 10 m depth, in the North Mediterranean Sea. The results indicated a mean annual decrease of 0.003 ± 0.001 pH units on the seawater scale. The seasonal variability was characterized by a pH decrease during springtime and a strong pH increase in late fall. Anthropogenic CO2 (CANT) absorption by the ocean was the key driver of seawater acidification in this region, accounting for about 70% of the observed drop in pH, followed by water temperature (about 30%). The total inorganic carbon (CT) data showed a CT increase of 30.0 ± 1.0 μmol kg−1 per decade. This decadal increase is mainly due to the CANT penetration (43.2 μmol kg−1 per decade) in surface waters, which is mitigated for by relatively small opposing changes in CT due to physical and biological processes.
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Submitted on : Thursday, March 10, 2016 - 11:44:10 AM
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Koffi Marcellin Yao, Olivier Marcou, Catherine Goyet, Véronique Guglielmi, Franck Touratier, et al.. Time variability of the north-western Mediterranean Sea pH over 1995–2011. Marine Environmental Research, Elsevier science, 2016, ⟨10.1016/j.marenvres.2016.02.016⟩. ⟨hal-01286093⟩



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