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| Titel |
CO2 air-sea fluxes across the Portuguese estuaries Tagus and Sado |
| VerfasserIn |
A. P. Oliveira, G. Cabeçadas, M. Nogueira |
| Konferenz |
EGU General Assembly 2009
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 11 (2009) |
| Datensatznummer |
250030132
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| Zusammenfassung |
| Generally, estuaries and proximal shelves under the direct influence of river runoff and large
inputs of organic matter are mostly heterotrophic and, therefore, act as a carbon source. In
this context the CO2 dynamics in Tagus and Sado estuaries (SW Portugal) was studied under
two different climate and hydrological situations. These moderately productive mesotidal
coastal-plain lagoon-type estuaries, localised in the center of Portugal and distant 30-40 km
apart, present quite different freshwater inflows, surface areas and water residence
times.
A study performed in 2001 revealed that the magnitude of CO2 fluxes in the two estuarine
systems varied seasonally. CO2 emissions during the huge rainfall winter were
similar in both estuaries, reaching a mean value of ~50 mmol m-2 d-1, while in
spring emissions from Sado were ~6 times higher then Tagus ones, attaining a mean
value of 62 mmol m-2 d-1. Nevertheless, in both sampling periods, Sado estuary
showed, within the upper estuary (salinity |
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