Eutrophication-induced acidification of coastal waters in the northern Gulf of Mexico: Insights into origin and processes from a coupled physical-biogeochemical model

Laurent, Arnaud; Fennel, Katja; Cai, Wei‐Jun; Huang, Wei‐Jen; Barbero, Leticia; Wanninkhof, Rik

doi:10.1002/2016gl071881

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Eutrophication-induced acidification of coastal waters in the northern Gulf of Mexico: Insights into origin and processes from a coupled physical-biogeochemical model

2017
By Laurent, Arnaud ; Fennel, Katja ; Cai, Wei‐Jun ; ...
Source: Geophysical Research Letters, 44(2), 946-956.

[PDF-1.84 MB]

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Journal Title:

Geophysical Research Letters
Personal Author:

Laurent, Arnaud ; Fennel, Katja ; Cai, Wei‐Jun ; Huang, Wei‐Jen ; Barbero, Leticia ; ... More +

Laurent, Arnaud ; Fennel, Katja ; Cai, Wei‐Jun ; Huang, Wei‐Jen ; Barbero, Leticia ; Wanninkhof, Rik Less -
NOAA Program & Office:

OAR (Oceanic and Atmospheric Research) ; AOML (Atlantic Oceanographic and Meteorological Laboratory) ; CIMAS (Cooperative Institute for Marine and Atmospheric Studies)

OAR (Oceanic and Atmospheric Research) ; AOML (Atlantic Oceanographic and Meteorological Laboratory) ; CIMAS (Cooperative Institute for Marine and Atmospheric Studies) Less -
Description:

Nutrient inputs from the Mississippi/Atchafalaya River system into the northern Gulf of Mexico promote high phytoplankton production and lead to high respiration rates. Respiration coupled with water column stratification results in seasonal summer hypoxia in bottom waters on the shelf. In addition to consuming oxygen, respiration produces carbon dioxide (CO2), thus lowering the pH and acidifying bottom waters. Here we present a high-resolution biogeochemical model simulating this eutrophication-driven acidification and investigate the dominant underlying processes. The model shows the recurring development of an extended area of acidified bottom waters in summer on the northern Gulf of Mexico shelf that coincides with hypoxic waters. Not reported before, acidified waters are confined to a thin bottom boundary layer where the production of CO2 by benthic metabolic processes is dominant. Despite a reduced saturation state, acidified waters remain supersaturated with respect to aragonite.
Source:

Geophysical Research Letters, 44(2), 946-956.
DOI:

https://doi.org/10.1002/2016gl071881
Document Type:

Journal Article
Funding:

Grant no. NA06N0S4780198 ; Grant no. NA09N0S4780208

Grant no. NA06N0S4780198 ; Grant no. NA09N0S4780208 Less -
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urn:sha256:7a8d3eb3d465b275cdf75ffa7e0930e73c24bbb35d267e66fc3b843e5e1558aa
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Eutrophication-induced acidification of coastal waters in the northern Gulf of Mexico: Insights into origin and processes from a coupled physical-biogeochemical model

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