Redox reactions and weak buffering capacity lead to acidification in the Chesapeake Bay.

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 Commun

journal_title

Nature communications

authors

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 WM

doi

10.1038/s41467-017-00417-7

subject

Has Abstract

pub_date

2017-08-28 00:00:00

pages

369

issue

1

issn

2041-1723

pii

10.1038/s41467-017-00417-7

journal_volume

8

pub_type

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