Denitrification effects on air-sea CO2 flux in the coastal ocean: Simulations for the northwest North Atlantic

Publication Type  Journal Article
Year of Publication  2008
Authors  Fennel, K.; Wilkin, J.; Previdi, M.; Najjar, R.
Journal Title  Geophysical Research Letters
Volume  35
Issue  24
Pages  -
Journal Date  Dec 27
ISBN Number  0094-8276
Accession Number  ISI:000262040500005
Key Words  continental-shelf; nitrogen; sediments; bight; carbon; system; acidification; alkalinity; transport; impact
Abstract  

The contribution of coastal oceans to the global air-sea CO2 flux is poorly quantified due to insufficient availability of observations and inherent variability of physical, biological and chemical processes. We present simulated air-sea CO2 fluxes from a high-resolution biogeochemical model for the North American east coast continental shelves, a region characterized by significant sediment denitrification. Decreased availability of fixed nitrogen due to denitrification reduces primary production and incorporation of inorganic carbon into organic matter, which leads to an increase in seawater pCO(2), but also increases alkalinity, which leads to an opposing decrease in seawater pCO(2). Comparison of simulations with different numerical treatments of denitrification and alkalinity allow us to separate and quantify the contributions of sediment denitrification to air-sea CO2 flux. The effective alkalinity flux resulting from denitrification is large compared to estimates of anthropogenically driven coastal acidification. Citation: Fennel, K., J. Wilkin, M. Previdi, and R. Najjar (2008), Denitrification effects on air-sea CO2 flux in the coastal ocean: Simulations for the northwest North Atlantic, Geophys. Res. Lett., 35, L24608, doi: 10.1029/2008GL036147.

Notes  

388SWTimes Cited:0Cited References Count:26

URL  <Go to ISI>://000262040500005
DOI  Doi 10.1029/2008gl036147