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

Autores

Kahl, L.C., Bianchi, A.A., Osiroff, A.P., Ruiz Pino, D., Piola, A.R.

Publicado en

Continental Shelf Research, v. 143:18-28.

Año de publicación

2017

Afiliaciones

Departamento de Ciencias de la Atmósfera y los Océanos, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Buenos Aires, Argentina Consejo Nacional de Investigaciones Científicas y Técnicas, Buenos Aires, Argentina Departamento Oceanografía, Servicio de Hidrografía Naval, Buenos Aires, Argentina Expérimentation et Approches Numériques, Laboratoire d&rsquoOcéanographie et du Climat, Université Pierre et Marie Curie, Paris, France

Programa

CRN3

Proyecto

CRN3070

Keywords

Sea-air CO2 fluxes, Patagonian Sea, Biological and thermal effects, Simpson parameter, Fronts, Spatial variability

DOI

https://doi.org/10.1016/j.csr.2017.05.011
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Resumen

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.

Highlights:

  • Near-shore regions outgas CO2 to the atmosphere while offshore regions uptake CO2.
  • Thermal effects dominate the CO2 variability in the near-shore region.
  • Biological effects dominate the CO2 variability in the offshore region.