Zoeken
Zoeken kan via de modus 'eenvoudig zoeken' (één veld) of uitgebreid via 'geavanceerd zoeken' (meerdere velden). Zo kan je bv. zoeken op een combinatie van een auteursnaam (auteur), een jaartal (jaar) en een documenttype.
Boekenmand
Nuttige resultaten kan je aanvinken en toevoegen aan een mandje. De inhoud hiervan kan je exporteren of afdrukken (naar bv. PDF).
RSS
Op de hoogte blijven van nieuw toegevoegde publicaties binnen uw interessegebied? Dit kan door een RSS-feed (?) te maken van jouw zoekopdracht.
nieuwe zoekopdracht
| one publication added to basket [238153] |
Low contribution of N2 fixation to new production and excess nitrogen in the subtropical northeast Atlantic margin
Benavides, M.; Aristegui, J.; Agawin, N.S.R.; Alvarez-Salgado, X.A.; Alvarez, M.; Troupin, C. (2013). Low contribution of N2 fixation to new production and excess nitrogen in the subtropical northeast Atlantic margin. Deep-Sea Res., Part 1, Oceanogr. Res. Pap. 81: 36-48. dx.doi.org/10.1016/j.dsr.2013.07.004
In: Deep-Sea Research, Part I. Oceanographic Research Papers. Elsevier: Oxford. ISSN 0967-0637; e-ISSN 1879-0119
|  |
| Trefwoord |
|
| Author keywords |
New production; Regenerated production; f-Ratio; Diazotrophy; Upwelling;Dissolved organic nitrogen release |
| Auteurs | | Top |
- Benavides, M.
- Aristegui, J.
- Agawin, N.S.R.
|
- Alvarez-Salgado, X.A.
- Alvarez, M.
- Troupin, C.
|
|
| Abstract |
We used 15N-labeled substrates to measure dinitrogen (N2) fixation, nitrate (NO3-) and ammonium (NH4+) uptake, regeneration and associated dissolved organic nitrogen (DON) release in a coastal upwelling system (Cape Ghir, ~31°N) and an open ocean grid (bounded between 25°–42°N and 20°W) in the Canary Current region during the summer of 2009. New production (Pnew=NO3- uptake+N2 fixation+DON released from NO3- uptake-NO3- regeneration) was higher in the upwelling than in the open ocean zone (0.126 and 0.014 µmol N L-1 h-1, respectively), while regenerated production (Preg=NH4+ uptake+DON released from NH4+ uptake+NH4+ regeneration) was similar in both zones (0.157 and 0.133 µmol N L-1 h-1, respectively). The resulting f -ratio (Pnew/Pnew+Preg) for the open ocean and upwelling zones was 0.08 and 0.48, respectively. The availability of nitrogen in excess of that expected from Redfield stoichiometry is generally attributed to N2 fixation. A previous study indicated that our open ocean grid zone had an excess nitrogen production rate of 40±22×1010 mol N yr-1. We revisited this budget including new dissolved organic matter and NO3-fluxes through the Strait of Gibraltar and estimated a revised nitrogen excess rate of 22±19×1010 mol N yr-1. The average volumetric rate of N2 fixation for this zone was only 1.3×10-3 nmol N L-1 d-1, indicating that its influence in Pnew and nitrogen excess production in this part of the Atlantic is negligible. |
IMIS is ontwikkeld en wordt gehost door het VLIZ.
