Annual balance and seasonal variability of sea-air CO<sub>2</sub> fluxes in the Patagonia Sea: Their relationship with fronts and chlorophyll distribution - CNRS - Centre national de la recherche scientifique Accéder directement au contenu
Article Dans Une Revue Journal of Geophysical Research Année : 2009

Annual balance and seasonal variability of sea-air CO2 fluxes in the Patagonia Sea: Their relationship with fronts and chlorophyll distribution

Alejandro A. Bianchi
  • Fonction : Auteur
Hernán G. Isbert Perlender
  • Fonction : Auteur
Ana P. Osiroff
  • Fonction : Auteur
Valeria Segura
  • Fonction : Auteur
Vivian Lutz
  • Fonction : Auteur
Moira Luz Clara
  • Fonction : Auteur
Carlos F. Balestrini
  • Fonction : Auteur
Alberto R. Piola
  • Fonction : Auteur

Résumé

Sea-air differences of CO2 partial pressures (ΔpCO2) and surface chlorophyll a (chl-a) concentration have been determined during 22 cruises in various seasons for 2000-2006 over the Patagonia Sea and shelf break. From spring to autumn, the nearshore waters act as a source of atmospheric CO2, while the midshelf and slope are a CO2 sink, leading to highly negative areal means of sea-air CO2 flux and ΔpCO2. The ΔpCO2 and CO2 flux in spring reach values of -67 μatm and -7 × 10-3 mol m-2 d-1, respectively, and are close to equilibrium in winter. Sea-air ΔpCO2 and chl-a over the shelf are negatively correlated, suggesting that photosynthesis is one of the main processes responsible for the large CO2 sequestration. The annual areal mean ΔpCO2 and sea-air CO2 flux are -31 μatm and -3.7 × 10-3 mol m-2 d-1, respectively, indicating that the Patagonia Sea is one of the strongest CO2 sinks per unit area in the World Ocean.
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hal-00760005 , version 1 (29-10-2021)

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Alejandro A. Bianchi, Diana Ruiz-Pino, Hernán G. Isbert Perlender, Ana P. Osiroff, Valeria Segura, et al.. Annual balance and seasonal variability of sea-air CO2 fluxes in the Patagonia Sea: Their relationship with fronts and chlorophyll distribution. Journal of Geophysical Research, 2009, 114, pp.03018. ⟨10.1029/2008JC004854⟩. ⟨hal-00760005⟩
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