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
The role of phytoplankton composition and microbial community metabolism in sea-air Delta pCO2 variation in the Weddell Sea
Moreau, S.; di Fiori, E.; Schloss, I.R.; Almandoz, G.O.; Esteves, J.L.; Paparazzo, F.E.; Ferreyra, G.A. (2013). The role of phytoplankton composition and microbial community metabolism in sea-air Delta pCO2 variation in the Weddell Sea. Deep-Sea Res., Part 1, Oceanogr. Res. Pap. 82: 44-59. dx.doi.org/10.1016/j.dsr.2013.07.010
In: Deep-Sea Research, Part I. Oceanographic Research Papers. Elsevier: Oxford. ISSN 0967-0637; e-ISSN 1879-0119
|  |
| Trefwoord |
|
| Author keywords |
Weddell Sea; CO2 dynamics; Phytoplankton composition; Communitymetabolism |
| Auteurs | | Top |
- Moreau, S.
- di Fiori, E.
- Schloss, I.R.
- Almandoz, G.O.
|
- Esteves, J.L.
- Paparazzo, F.E.
- Ferreyra, G.A.
|
|
| Abstract |
The Weddell Sea is known to be a CO2 sink due to active biological and physical pumps. Here we study the relationships of phytoplankton biomass and composition and microbial community metabolism, estimated from simulated in situ incubations and from nutrient's difference between surface and subsurface waters, with ?pCO2 in the Weddell Sea, during four austral summers (2002–2005). The ?pCO2 was significantly negative throughout the Weddell Sea in 2002 (-17.2±28.1 µatm), 2003 (-64.1±31.3 µatm), 2004 (-54.9±61.8 µatm) and 2005 (-63.8±60 µatm), indicating that the Weddell Sea acted as an atmospheric CO2 sink during those summers. The ?pCO2 was significantly lower in the south than in the center or north of the Weddell Sea. This was consistent with the significantly higher Chlorophyll-a concentrations (Chl-a) observed in the south (2.3±1.9 µg l-1) than in the center (1.3±1.2 µg l-1) or north (1.4±1.7 µg l-1). In contrast, waters were mainly undersaturated in O2, due to the upwelling of oxygen poor Warm Deep Water (WDW). The negative relationship between the ?pCO2 and the %O2 saturation suggested that planktonic metabolic activities played a role in these gases dynamics, along with the upwelling of WDW. However, these relationships could not be observed from the results of the incubation experiments, probably because of different temporal scales between gas exchanges in incubation experiments and in situ CO2 and O2 dynamics. The dynamics of CO2 and O2 were solely related to the net community production (NCP) and to the gross primary production (GPP) when only stations with Chl-a > 1 µg l-1 were considered. A significant relationship was, however, found between ?pCO2 and the primary production until the time of sampling for all stations when estimated from nutrients depletion between surface and subsurface waters. Finally, the distribution of CO2 and O2 were related to the biomass of diatoms and, contrarily to other seas, to the biomass of phytoflagellates. |
IMIS is ontwikkeld en wordt gehost door het VLIZ.
