@article{fdi:010044054,
  title = {{D}oes ocean acidification induce an upward flux of marine aggregates ?},
  author = {{M}ari, {X}avier},
  editor = {},
  language = {{ENG}},
  abstract = {{T}he absorption of anthropogenic atmospheric carbon dioxide ({CO}2) by the ocean provokes its acidification. {T}his acidification may alter several oceanic processes, including the export of biogenic carbon from the upper layer of the ocean, hence providing a feedback on rising atmospheric carbon concentrations. {T}he effect of seawater acidification on transparent exopolymeric particles ({TEP}) driven aggregation and sedimentation processes were investigated by studying the interactions between latex beads and {TEP} precursors collected in the lagoon of {N}ew {C}aledonia. {A} suspension of {TEP} and beads was prepared and the formation of mixed aggregates was monitored as a function of p{H} under increasing turbulence intensities. {T}he p{H} was controlled by addition of sulfuric acid. {A}ggregation and sedimentation processes driven by {TEP} were drastically reduced when the p{H} of seawater decreases within the expected limits imposed by increased anthropogenic {CO}2 emissions. {I}n addition to the diminution of {TEP} sticking properties, the diminution of seawater p{H} led to a significant increase of the {TEP} pool, most likely due to swollen structures. {A} diminution of seawater p{H} by 0.2 units or more led to a stop or a reversal of the downward flux of particles. {I}f applicable to oceanic conditions, the sedimentation of marine aggregates may slow down or even stop as the p{H} decreases, and the vertical flux of organic carbon may reverse. {T}his would enhance both rising atmospheric carbon and ocean acidification.},
  keywords = {},
  booktitle = {},
  journal = {{B}iogeosciences},
  volume = {5},
  numero = {4},
  pages = {1023--1031},
  ISSN = {1726-4170},
  year = {2008},
  URL = {https://www.documentation.ird.fr/hor/fdi:010044054},
}