Trends of anthropogenic CO 2 along 20º W in the Iberian Basin

• Published in: Ciencias Marinas
• Main Authors: Fajar, N. M., Pardo, P. C., Carracedo, Lidia, Vazquez-rodriguez, M., Rios, A. F., Perez, Ff
• Format: Article in Journal/Newspaper
• Language: English
• Published: Inst Investigaciones Oceanologicas, U A B C 2012
• Subjects: anthropogenic CO2; back-calculation; North Atlantic
• Online Access: https://archimer.ifremer.fr/doc/00629/74112/73546.pdf; https://doi.org/10.7773/cm.v38i1B.1810; https://archimer.ifremer.fr/doc/00629/74112/

The carbon system in the water masses of the Iberian Basin (North Atlantic Ocean) has been affected over the last two decades by the increase in anthropogenic CO2 (C-ant). In order to study the storage of C-ant in the Iberian Basin, variables of the carbonic system (i.e., pH, total inorganic carbon, and total alkalinity), among others, were measured during the CAIBOX cruise conducted between July and August 2009 within the framework of the CAIBEX project (Shelf-Ocean Exchanges in the Canary-Iberian Large Marine Ecosystem). The storage of C-ant was estimated using two different back-calculation techniques (i.e., the phi C degrees(T) and TrOCA methods) and for six layers of the water column corresponding to the approximate locations of the characteristic water masses of the region and the mixed layers. For the whole water column and for the year 2009 the C-ant storage values determined by the phi C degrees(T) and TrOCA methods were 88.1 +/- 3.8 and 93.7 +/- 3.7 molC m(-2), respectively. Moreover, the C-ant storage rate from 1993 to 2009 was also estimated considering data from three additional cruises (OACES 1993, CHAOS 1998, and OACES 2003). The C-ant storage rates were 1.41 +/- 0.25 and 1.67 +/- 0.13 molC m(-2) yr(-1) with the phi C degrees(T) and TrOCA methods, respectively. An increase in anthropogenic CO2 uptake by the ocean can be seen when compared with previous published results. Between the periods 1977-1997 and 1993-2009, the C-ant concentration increased around 28-49% in the First 2000 m. El sistema del carbono en las masas de agua de la Cuenca Ibérica (océano Atlántico norte) se ha visto afectado en las últimas dos décadas por el aumento de CO2 antropogénico (Cant). Durante la campaña CAIBOX (del proyecto Shelf-Ocean Exchanges in the Canary- Iberian Large Marine Ecosystem) y con el fin de estudiar el almacenamiento de Cant en la Cuenca Ibérica, se midieron entre julio y agosto de 2009, entre otras variables, las del sistema del carbónico [pH, carbono inorgánico total (CT) y alcalinidad total (AT)]. ...