Distribution of sea-air CO2 fluxes in the Patagonian Sea: Seasonal, biological and thermal effects

Sea-air CO2 fluxes (FCO2) in the Patagonian Sea (PS) were studied using observations collected in 2000–2006. Based on the PS frontal structures and the thermal and biological contributions to FCO2 we present a regional subdivision between distinct regimes that provide new insights on the processes t...

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Detalles Bibliográficos
Autores principales: Kahl, L.C., Bianchi, A.A., Osiroff, A.P., Pino, D.R., Piola, A.R.
Formato: JOUR
Materias:
Biological and thermal effects
Fronts
Patagonian Sea
Sea-air CO2 fluxes
Simpson parameter
Spatial variability
air-sea interaction
biological pump
carbon dioxide
carbon flux
equilibrium
front
parameterization
seasonal variation
seasonality
spatial variation
Atlantic Ocean
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_02784343_v143_n_p18_Kahl
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
Descripción
Sumario:Sea-air CO2 fluxes (FCO2) in the Patagonian Sea (PS) were studied using observations collected in 2000–2006. Based on the PS frontal structures and the thermal and biological contributions to FCO2 we present a regional subdivision between distinct regimes that provide new insights on the processes that control these fluxes. The coastal regime (CR) is a net source of atmospheric CO2 (4.9 × 10−3 mol m−2 d−1) while the open shelf regime (SHR) is a net CO2 sink (−6.0 × 10−3 mol m−2 d−1). The interface between these two regions closely follows the location of along-shore fronts. In addition, based on the nature of the processes that drive the FCO2, the PS is subdivided between northern (NR) and southern (SR) regions. Both, NR and SR are CO2 sinks, but the CO2 uptake is significantly higher in NR (−6.4 × 10−3 mol m−2 d−1) than in SR (−0.5 × 10−3 mol m−2 d−1). The data reveal a strong seasonality in FCO2. The mean CO2 capture throughout the PS in austral spring is −5.8 × 10−3 mol m−2 d−1, reaching values lower than −50 × 10−3 mol m−2 d−1 in NR, while in winter FCO2 is close to equilibrium in SR. The analysis of the biological and thermal effects (BE and TE, respectively) on seasonal pCO2 variability indicates that regions of CO2 emission are dominated by the TE while regions of CO2 uptake are dominated by the BE. Our results indicate that the biological pump is the dominant process determining the sea-air CO2 flux in the PS. © 2017 The Authors

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