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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|
|In: Atmospheric Environment (1994). Pergamon: Oxford. ISSN 1352-2310, more|
Aerosols; Coasts; Dissolved organic carbon; Eutrophication; Gases; Inorganic compounds; Nitrogen compounds; Seasonal variations; ANE, Belgium, Belgian Coast [gazetteer]; ANE, North Sea [gazetteer]; Marine
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- Bencs, L. publication list, more
- Krata, A. publication list, more
- Horemans, B. publication list, more
- Buczynska, A.J. publication list, more
- Dirtu, A.C. publication list, more
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.