Biological productivity along Line P in the subarctic northeast Pacific: In situ versus incubation-based methods
| Type | : | ACL |
|---|---|---|
| Nature | : | Production scientifique |
| Au bénéfice du Laboratoire | : | Non |
| Statut de publication | : | Publié |
| Année de publication | : | 2012 |
| Auteurs (3) | : | GIESBRECHT K,e HAMME Roberta,c EMERSON S,r |
| Revue scientifique | : | Global Biogeochemical Cycles |
| Volume | : | 26 |
| Fascicule | : | |
| Pages | : | |
| DOI | : | 10.1029/2012GB004349 |
| URL | : | - |
| Abstract | : | We compared net community production determined from an in situ O-2/Ar mass balance (O-2/Ar-NCP) with incubation measurements of new and primary production in the subarctic northeast Pacific. In situ O-2/Ar-NCP was strongly correlated to new production from 24-h (NO3-)-N-15 uptake integrated over the mixed layer (N-15-NewP), if measurements were separated into high and low-productivity conditions. Under high-productivity conditions, O-2/Ar-NCP estimates were similar to N-15-NewP, whereas under low productivity conditions O-2/Ar-NCP was up to two times higher than N-15-NewP. The relationship between O-2/Ar-NCP and 24-h C-13 primary production (C-13-PP) was more variable, but with a consistent mean O-2/Ar-NCP: C-13-PP ratio of 0.52 +/- 0.17 when only low-productivity, summer measurements were considered. This relationship with primary production is perturbed by high productivity events such as a late-summer, iron-stimulated bloom observed at the offshore stations. Finally, we show that diapycnal mixing usually dominates the O-2/Ar mass balance in winter in the subarctic Pacific, preventing the determination of NCP by the O-2/Ar method at that time, except for one unusual stratification event in February 2007. |
| Mots-clés | : | EUPHOTIC ZONE; HETEROTROPHIC BACTERIA; INTERANNUAL VARIABILITY; NET COMMUNITY PRODUCTION; ORGANIC NITROGEN RELEASE; PHYTOPLANKTON; RESPIRATION RATES; SEA GAS-EXCHANGE; SOUTHERN-OCEAN; SURFACE WATERS |
| Commentaire | : | Times Cited in Web of Science Core Collection: 22 |
| Tags | : | - |
| Fichier attaché | : | - |
| Citation | : |
Giesbrecht KE, Hamme RC, Emerson SR (2012) Biological productivity along Line P in the subarctic northeast Pacific: In situ versus incubation-based methods. Global Biogeochem Cy 26 | doi: 10.1029/2012GB004349
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