Ocean acidification of the Greater Caribbean Region 1996-2006

Dwight K. Gledhill, Rik Wanninkhof, Frank J Millero, Mark Eakin

Research output: Contribution to journalArticle

60 Scopus citations


The global oceans serve as the largest sustained natural sink for increasing atmospheric carbon dioxide (CO2) concentrations. As this CO2 is absorbed by seawater, it not only reacts causing a reduction in seawater pH (or acidification) but also decreases the carbonate mineral saturation state (Ω), which plays an important role in calcification for many marine organisms. Ocean acidification could affect some of the most fundamental biological and geochemical processes of the sea in coming decades. Observations obtained in situ from Volunteer Observing Ships and multiple geochemical surveys have been extended using satellite remote sensing and modeled environmental parameters to derive estimates of sea-surface alkalinity (AT) and carbon dioxide partial pressure (PCO2,sw). Pairing estimates of AT and PCO2,sw have permitted characterization of the changes in sea-surface Ω, which have transpired over the past decade throughout the Greater Caribbean Region as a consequence of ocean acidification. The results reveal considerable spatial and temporal variability throughout the region. Despite this variability, we observed a strong secular decrease in aragonite saturation state (Ω arg) at a rate of approximately -0.012 ± 0.001 Ωarg yr-1 (r2=0.97, P<0.001).

Original languageEnglish (US)
Article numberC10031
JournalJournal of Geophysical Research C: Oceans
Issue number10
StatePublished - Oct 8 2008


ASJC Scopus subject areas

  • Geochemistry and Petrology
  • Geophysics
  • Earth and Planetary Sciences (miscellaneous)
  • Space and Planetary Science
  • Oceanography

Cite this

Gledhill, D. K., Wanninkhof, R., Millero, F. J., & Eakin, M. (2008). Ocean acidification of the Greater Caribbean Region 1996-2006. Journal of Geophysical Research C: Oceans, 113(10), [C10031]. https://doi.org/10.1029/2007JC004629