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Title

Carbon cycling in a Patagonian fjord: Strength of biological vs. physical pump

AuthorsTaglialatela, S. ; Flecha, Susana ; Huertas, I. Emma ; Prieto, Laura ; Morris, Edward P.
Issue DateNov-2014
Citation2nd International Ocean Research Conference (2014)
AbstractUnderstanding the role of the pelagic “biological and physical pump” in carbon cycling is critical to climate change adaptation and mitigation efforts especially in coastal areas characterized by intense biogeochemical cycling. Fjords are among the few coastal regions that appear to be net annual sinks for atmosphericCO2. Vertical profiles of temperature and salinity were collected with a CTD revealing intense vertical structure in the water column that could be summarised as 2 layers with a transition-mixing region .Spatio-temporal sampling of physical and biogeochemical (C system, nutrients, Phyto- and Zooplankton, in situ dissolved pCO2) parameters was conducted in Comau Fjord (Puerto Montt-Chile) during Austral spring from the surface and deep layers. Spatial variation in water column structure in the fjord was minimal, however the depth of the upper layer varies probably depending on the surface-water inputs. Surface waters had significantly lower pCO2 values compared to the atmosphere and deeper water. Concentrations of suspended material and chlorophyll a were higher deeper in the water column, suggesting concentration process of material across the halocline. Overall, concentrations of particulate matter and mesozooplankton (during the study period), were low compared to many mid-latitude regions, and near absent in the vicinity of the 2 rivers entering the fjord. The low surface water pCO2 values suggest negative air-water CO2fluxes predominates within Comau Fjord during Austral spring. This preliminary study suggests that the geochemical properties of watershed and the low [DIC] of surface-water inputs, i.e., the physical pump, seems to play an important role in this region.
DescriptionPóster presentado en la 2nd International Ocean Research Conference, celebrada en Barcelona del 17 al 21 de noviembre de 2014.
URIhttp://hdl.handle.net/10261/116265
Appears in Collections:(ICMAN) Comunicaciones congresos
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