Abstract:
:The combined effects of anthropogenic and biological CO2 inputs may lead to more rapid acidification in coastal waters compared to the open ocean. It is less clear, however, how redox reactions would contribute to acidification. Here we report estuarine acidification dynamics based on oxygen, hydrogen sulfide (H2S), pH, dissolved inorganic carbon and total alkalinity data from the Chesapeake Bay, where anthropogenic nutrient inputs have led to eutrophication, hypoxia and anoxia, and low pH. We show that a pH minimum occurs in mid-depths where acids are generated as a result of H2S oxidation in waters mixed upward from the anoxic depths. Our analyses also suggest a large synergistic effect from river-ocean mixing, global and local atmospheric CO2 uptake, and CO2 and acid production from respiration and other redox reactions. Together they lead to a poor acid buffering capacity, severe acidification and increased carbonate mineral dissolution in the USA's largest estuary.The potential contribution of redox reactions to acidification in coastal waters is unclear. Here, using measurements from the Chesapeake Bay, the authors show that pH minimum occurs at mid-depths where acids are produced via hydrogen sulfide oxidation in waters mixed upward from anoxic depths.
journal_name
Nat Communjournal_title
Nature communicationsauthors
Cai WJ,Huang WJ,Luther GW 3rd,Pierrot D,Li M,Testa J,Xue M,Joesoef A,Mann R,Brodeur J,Xu YY,Chen B,Hussain N,Waldbusser GG,Cornwell J,Kemp WMdoi
10.1038/s41467-017-00417-7subject
Has Abstractpub_date
2017-08-28 00:00:00pages
369issue
1issn
2041-1723pii
10.1038/s41467-017-00417-7journal_volume
8pub_type
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