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Title: Transports and budgets of anthropogenic CO2 in the tropical North Atlantic in 1992-1993 and 2010-2011
Authors: Zunino, Patricia
Pérez, Fiz F.
Fajar, Noelia M.
Guallart, Elisa F.
Ríos, Aida F.
Pelegrí Llopart,José Luis 
Hernández-Guerra, Alonso 
UNESCO Clasification: 251007 Oceanografía física
Keywords: Anthropogenic CO2
Storage rate
Air‐sea fluxes
Changes in circulation, et al
Issue Date: 2015
Project: Memoria Oceánica Del Clima: Flujo de Aguas Intermedias en El Atlántico Austral y Su Transformación en Aguas Superficiales en El Atlántico Ecuatorial. 
Expedición de Circunnavegación Malaspina 2010: Cambio Global y Exploración Del Océano Global 
Journal: Global Biogeochemical Cycles 
Abstract: The meridional transport of anthropogenic CO2 (Cant) in the tropical North Atlantic (TNA) is investigated using data from transoceanic sections along 7.5°N and 24.5°N, carried out in the early 1990s and 2010s. The net Cant transport across both sections is northward. At 7.5°N, this transport increased from 315 ± 47 kmol s−1 in 1993 to 493 ± 51 kmol s−1 in 2010; similarly, across 24.5°N it grew from 530 ± 46 kmol s−1 in 1992 to 662 ± 49 kmol s−1 in 2011. These changes result from modifications in the intermediate and deep circulation patterns, as well as from Cant increase within the thermocline waters. In deep waters, lateral advection causes a net Cant input of 112 ± 60 kmol s−1 (234 ± 65 kmol s−1) in 1992–1993 (2010–2011); within these deep waters, the storage rate of Cant is not statistically different from the net Cant input, 139 ± 21 kmol s−1 (188 ± 21 kmol s−1) in 1992–1993 (2010–2011). The Cant increase in deep waters is due to the large injection of Cant across the 24.5°N by the Deep Western Boundary Current and the northward recirculation of North Atlantic Deep Water along 7.5°N. In contrast, a large net Cant output in the upper layer is caused by the Florida Current. Despite this net Cant output, the Cant accumulates at a rate of 215 ± 24 kmol s−1 (291 ± 24 kmol s−1) referenced to year 1993 (2010). From the two Cant budgets, we infer a Cant air‐sea flux of 0.23 ± 0.02 Pg yr−1in the TNA, much larger than previous estimates.
ISSN: 0886-6236
DOI: 10.1002/2014GB005075
Source: Global Biogeochemical Cycles [ISSN 0886-6236], v. 29 (7), p. 1075-1091
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