Nitrogen uptake conditions at VERTIGO study sites. M Elskens, N Brion, F Dehairs, W Baeyens & N Savoye Pleinlaan 2, B-1050 Brussel , Belgium ([email protected]).
M Elskens, N Brion, F Dehairs, W Baeyens & N Savoye
Pleinlaan 2, B-1050 Brussel , Belgium ([email protected])
Data analysis: A model comparison approach
N uptake conditions at the VERTIGO sampling sites
Primary and new production variability over the sampling period
This research was conducted under grant GOA22/DSCH WER4 as part of the project Geconcer-teerde Onderzoek-acties supported by the Vrije Universiteit Brussel and under grant G.0021.04 as part of a Research Foundation Flanders project.
The authors would like to thank Ken Buesseler for the scientific coordina-tion of the VERTIGO project
Conclusions Two regimes of new production have been identified; K2 shows relatively high nitrate specific uptake rates (VNO3) but rather low new production rates and is characteristic of HNLC regions. Aloha has low VNO3, low new production and behaves typically as an oligotrophic area. At both sites there is an agreement between the estimates of new production and the POC flux samples by neutrally buoyant traps at 150m with an export ratio ranging from 1 (Aloha) to maximally 3 at K2.