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

被引:149
作者
Fennel, Katja [1 ]
Wilkin, John [4 ]
Previdi, Michael [3 ]
Najjar, Raymond [2 ]
机构
[1] Dalhousie Univ, Dept Oceanog, Halifax, NS B3H 4J1, Canada
[2] Penn State Univ, Dept Meteorol, University Pk, PA 16802 USA
[3] Columbia Univ, Lamont Doherty Earth Observ, Palisades, NY 10964 USA
[4] Rutgers State Univ, Inst Marine & Coastal Sci, New Brunswick, NJ 08901 USA
基金
加拿大自然科学与工程研究理事会;
关键词
D O I
10.1029/2008GL036147
中图分类号
P [天文学、地球科学];
学科分类号
07 ;
摘要
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.
引用
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页数:5
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