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

Other titles Tendencias del CO 2 antropogénico a lo largo de 20º W en la Cuenca Ibérica
Type Article
Date 2012-04
Language English
Author(s) Fajar N. M.1, Pardo P. C.1, Carracedo LidiaORCID1, Vazquez-Rodriguez M.1, Rios A. F.1, Perez Ff1
Affiliation(s) 1 : CSIC, Inst Invest Marinas, Vigo 36208, Spain.
Source Ciencias Marinas (0185-3880) (Inst Investigaciones Oceanologicas, U A B C), 2012-04 , Vol. 38 , N. 1B , P. 287-306
DOI 10.7773/cm.v38i1B.1810
WOS© Times Cited 7
Keyword(s) anthropogenic CO2, back-calculation

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.

Abstract <p>El sistema del carbono en las masas de agua de la Cuenca Ib&eacute;rica (oc&eacute;ano Atl&aacute;ntico norte) se ha visto afectado en las &uacute;ltimas dos d&eacute;cadas por el aumento de CO2 antropog&eacute;nico (Cant). Durante la campa&ntilde;a 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 Ib&eacute;rica, se midieron entre julio y agosto de 2009, entre otras variables, las del sistema del carb&oacute;nico [pH, carbono inorg&aacute;nico total (CT) y alcalinidad total (AT)]. El almacenamiento de Cant fue estimado usando dos t&eacute;cnicas de retroc&aacute;lculo diferentes (m&eacute;todos ϕC&ordm;T y TrOCA) y en seis capas de la columna de agua, correspondientes unas a la ubicaci&oacute;n aproximada de las masas de agua t&iacute;picas de la regi&oacute;n y otras a las capas de mezcla de las masas de agua. El almacenamiento de Cant en la columna de agua completa para 2009 fue de 88.1 &plusmn; 3.8 molC m&ndash;2 seg&uacute;n el m&eacute;todo ϕC&ordm;T y de 93.7 &plusmn; 3.7 molC m&ndash;2 seg&uacute;n el m&eacute;todo TrOCA. Por otra parte, se estim&oacute; tambi&eacute;n la tasa de almacenamiento de Cant desde 1993 a 2009, teniendo en cuenta los datos de tres campa&ntilde;as adicionales (OACES 1993, CHAOS 1998 y OACES 2003). Las tasas de almacenamiento de Cant obtenidas fueron 1.41 &plusmn; 0.25 y 1.67 &plusmn; 0.13 molC m&ndash;2 a&ntilde;o&ndash;1 seg&uacute;n los m&eacute;todos ϕC&ordm;T y TrOCA, respectivamente, lo que al compararse con estudios previos representa un incremento en la captaci&oacute;n de CO2 antropog&eacute;nico, ya que entre los periodos 1977&ndash;1997 y 1993&ndash;2009, la concentraci&oacute;n de Cant se aument&oacute; en torno a un 28&ndash;49 % en los primeros 2000 m de profundidad.</p>
Full Text
File Pages Size Access
Publisher's official version 20 1 MB Open access
Top of the page