Interactive comment on “Biological productivity in the Mauritanian upwelling estimated with a triple gas approach” by T. Steinhoff et al
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General Comments The authors present a novel approach for calculating net community production (NCP) in eastern boundary upwelling systems using data from the Mauritanian Upwelling as a case study. Their calculations rely on a triple gas approach (N2O; CO2 and O2), though O2 is primarily used to validate the results derived for CO2. Briefly, N2O is used as a quasi-inert tracer of recently upwelled water to calculate the time since upwelling (τ ). This is used to assign τ i values to concurrent DIC data. The latter are corrected for sea-air gas exchange over τ i+1-τ i and the resulting value is subtracted from the observed DIC for τ i+1 to derive NCP. The authors show that NCP from three cruises is strongly correlated with the upwelling index (UI) derived from model predictions. This could be a particularly attractive and cost-effective way of quantifying NCP under different upwelling conditions. The paper addresses pertinent scientific questions and is within the scope of BG. To my knowledge, this is a novel C1010
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Interactive comment on “Biological productivity in the Mauritanian upwelling estimated with a triple gas approach” by T. Steinhoff et al
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Interactive comment on “Biological productivity in the Mauritanian upwelling estimated with a triple gas approach” by T. Steinhoff et al
This paper describes a clever way of deriving net community production (NCP) using measured mixed layer concentrations of N2O, O2 and CO2. This seems to me to be a basically sound approach and is appropriate for publication in Biogeosciences. In agreement with the exhaustive comments of a previous anonymous reviewer I believe that the major issues to address are those relating to data and calcu...
متن کاملInteractive comment on “Biological productivity in the Mauritanian upwelling estimated with a triple gas approach” by T. Steinhoff et al
General Comments The authors present a novel approach for calculating net community production (NCP) in eastern boundary upwelling systems using data from the Mauritanian Upwelling as a case study. Their calculations rely on a triple gas approach (N2O; CO2 and O2), though O2 is primarily used to validate the results derived for CO2. Briefly, N2O is used as a quasi-inert tracer of recently upwel...
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A Lagrangian approach based on a physical-biogeochemical modeling was used to compare the potential transfer of cadmium (Cd) from natural and anthropogenic sources to plankton communities (Cd-uptake) in the North-West African upwelling. In this region, coastal upwelling was estimated to be the main natural source of Cd while the most significant anthropogenic source for marine ecosystem is prov...
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