FN Archimer Export Format PT J TI CO2 fluxes in the Northeast Atlantic Ocean based on measurements from a surface ocean observation platform BT AF Curbelo-Hernández, D González-Dávila, M Gonzalez, AG González-Santana, D Santana-Casiano, JM AS 1:1;2:1;3:1;4:1,2;5:1; FF 1:;2:;3:;4:;5:; C1 Instituto de Oceanografía y Cambio Global, IOCAG, Universidad de Las Palmas de Gran Canaria, 35017, Spain Univ Brest, CNRS IRD, IFREMER, LEMAR, F-29280 Plouzane, France C2 UNIV LAS PALMAS GRAN CANARIA, SPAIN UBO, FRANCE UM LEMAR IN WOS Cotutelle UMR copubli-europe IF 10.754 TC 7 UR https://archimer.ifremer.fr/doc/00679/79091/81549.pdf LA English DT Article DE ;CO2 system;Air-sea CO2 exchange;Northeast Atlantic;Northwest African coastal upwelling;Surface ocean observation platform AB The seasonal and spatial variability of the CO2 system parameters and CO2 air-sea exchange were studied in the Northeast Atlantic Ocean between the northwest African coastal upwelling and the oligotrophic open-ocean waters of the North Atlantic subtropical gyre. Data was collected aboard a volunteer observing ship from February 2019 to February 2020. The seasonal and spatial variability of CO2 fugacity in seawater (fCO2,sw) was strongly driven by the seasonal temperature variation, which increased with latitude and was lower throughout the year in coastal regions where the upwelling and offshore transport was more intense. The thermal to biological effect ratio (T/B) was approximately 2, with minimum values along the African coastline related to higher biological activity in the upwelled waters. The fCO2,sw increased from winter to summer by 11.84 ± 0.28 μatm°C-1 on the inter-island routes and by 11.71 ± 0.25 μatm°C-1 along the northwest African continental shelf. The seasonality of total inorganic carbon normalized to constant salinity of 36.7 (NCT) was studied throughout the region. The effect of biological processes and calcification/dissolution on NCT between February and October represented >90% of the reduction of inorganic carbon while air-sea exchange described <6%. The seasonality of air-sea CO2 exchange was controlled by temperature. The surface waters of the entire region acted as a CO2 sink during the cold months and as a CO2 source during the warm months. The Canary basin acted as a net sink of -0.26 ± 0.04 molC m-2 yr-1. The northwest African continental shelf behaved as a stronger sink at -0.48 ± 0.09 molC m-2 yr-1. The calculated average CO2 flux for the entire area was -2.65 ± 0.44 TgCO2 yr-1 (-0.72 ± 0.12 TgC yr-1). PY 2021 PD JUL SO Science Of The Total Environment SN 0048-9697 PU Elsevier VL 775 UT 000641611700014 DI 10.1016/j.scitotenv.2021.145804 ID 79091 ER EF