Atmospheric nitrogen fluxes at the Belgian coast: 2004-2006

Bencs, L.; Krata, A.; Horemans, B.; Buczynska, A.J.; Dirtu, A.C.; Godoi, A.F.L.; Godoi, R.H.M.; Potgieter-Vermaak, S.; Van Grieken, R.

doi:/10.1016/j.atmosenv.2009.04.002

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Atmospheric nitrogen fluxes at the Belgian coast: 2004-2006

Bencs, L.; Krata, A.; Horemans, B.; Buczynska, A.J.; Dirtu, A.C.; Godoi, A.F.L.; Godoi, R.H.M.; Potgieter-Vermaak, S.; Van Grieken, R. (2009). Atmospheric nitrogen fluxes at the Belgian coast: 2004-2006. Atmos. Environ. (1994) 43(24): 3786-3798. dx.doi.org/10.1016/j.atmosenv.2009.04.002

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VLIZ: Open Marine Archive 157399 [ download pdf ]

Keywords

Aerosols
Chemical compounds > Nitrogen compounds
Eutrophication
Gases
Inorganic compounds
Organic matter > Carbon > Organic carbon > Dissolved organic matter > Dissolved organic carbon
Temporal variations > Periodic variations > Seasonal variations
Topographic features > Landforms > Coasts
ANE, Belgium, Belgian Coast [Marine Regions]
Marine/Coastal

Author keywords

Gaseous; Aerosol; Wet nitrogen flux; Atmospheric deposition; InorganicN-nutrients; Dissolved organic nitrogen; Coastal eutrophication; NorthSea

Authors		Top
Bencs, L., more Krata, A., more Horemans, B., more	Buczynska, A.J., more Dirtu, A.C., more Godoi, A.F.L., more	Godoi, R.H.M., more Potgieter-Vermaak, S., more Van Grieken, R., more

Abstract

Daily and seasonal variations in dry and wet atmospheric nitrogen fluxes have been studied during four campaigns between 2004 and 2006 at a coastal site of the Southern North Sea at De Haan (Belgium) located at coordinates of 51.1723° N and 3.0369°; E. Concentrations of inorganic N-compounds were determined in the gaseous phase, size-segregated aerosol (coarse, medium, and fine), and rainwater samples. Dissolved organic nitrogen (DON) was quantified in rainwater. The daily variations in N-fluxes of compounds were evaluated with air-mass backward trajectories, classified into the main air-masses arriving at the sampling site (i.e., continental, North Sea, and Atlantic/UK/Channel).The three, non-episodic campaigns showed broadly consistent fluxes, but during the late summer campaign exceptionally high episodic N-deposition was observed. The average dry and wet fluxes for non-episodic campaigns amounted to 2.6 and4.0mg N m^-2 d^-1, respectively, whereas during the episodic late summer period these fluxes were as high as 5.2 and 6.2mg N m^-2 d^-1, respectively. Non-episodic seasons/campaigns experienced average aerosol fluxes of 0.9-1.4 mg N m d^-1. Generally, the contribution of aerosol NH₄⁺ was more significant in the medium and fine particulate fractions than that of aerosol NO₃^-, whereas the latter contributed more in the coarse fraction, especially in continental air-masses. During the dry mid-summer campaign, the DON contributed considerably (~15%) to the total N-budget.Exceptionally high episodic aerosol-N inputs have been observed for the late summer campaign, with especially high deposition rates of 3.6 and 2.9 mg N m^-2 d^-1 for Atlantic/UK/Channel and North Sea-continental (mixed) air-masses, respectively. During this pollution episode, the flux of NH₄⁺ was dominating in each aerosol fraction/air-mass, except for coarse continental aerosols. High deposition of gaseous-N was also observed in this campaign with an average total N-flux of 2-2.5-times higher than in other campaigns.

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