Anthropogenic Carbon Transport Variability in the Atlantic Ocean Over Three Decades

The change in anthropogenic CO2 (Canth) in the Atlantic Ocean is linked to the Atlantic Meridional Overturning Circulation (AMOC), that redistributes Canth meridionally and in depth. We have employed direct biogeochemical measurements and hydrographic data from the last 30 years, adjusted using inve...

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Bibliographic Details
Published in:Global Biogeochemical Cycles
Main Authors: Cainzos Díaz, Verónica, Velo, Antón, Pérez, Fiz F., Hernández Guerra, Alonso
Other Authors: orcid:0000-0003-2666-1862, orcid:0000-0002-7598-5700, orcid:0000-0003-4836-8974, orcid:0000-0002-4883-8123, 57212651551, 36007807200, 56598611300, 6701736545, BU-BAS
Format: Article in Journal/Newspaper
Language:English
Published: 2022
Subjects:
251002 Oceanografía química
251007 Oceanografía física
251001 Oceanografía biológica
230305 Carbono
Anthropogenic carbon
AMOC
Overtuning
Antarc*
Antarctic
North Atlantic
Online Access:http://hdl.handle.net/10553/119361
https://doi.org/10.1029/2022GB007475
Description
Summary:The change in anthropogenic CO2 (Canth) in the Atlantic Ocean is linked to the Atlantic Meridional Overturning Circulation (AMOC), that redistributes Canth meridionally and in depth. We have employed direct biogeochemical measurements and hydrographic data from the last 30 years, adjusted using inverse models for each decade with both physical and biogeochemical constraints. We then have computed the meridional transports and the vertical transports between two sections at the interphases by advection and diffusion. We have focused on the repeated sections at three latitudes—30°S, 24, and 55°N, dividing the Atlantic into two boxes. We have divided the net transport into upper, deep and abyssal layers, with an upper and abyssal northward transport of Canth and a southward component in deep layers. The change in time in the net transports of Canth appears to be mainly due to modifications in the transport of upper layers. The lower layer of the AMOC, a combination of deep and abyssal waters, maintain more consistent transports in time. Vertical advection plays an important role in the North Atlantic, exporting Canth from upper to deep layers. In the South Atlantic, the newly formed Antarctic Bottom Water exports Canth from abyssal to deep layers. The strong gradient in Canth concentration at the interphase of upper and deep layers results in a strong vertical diffusion. 2,19 5,2 Q1 Q1 SCIE 11,0

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