Ibanhez J. S. P. auteur aut IRD Montes M. F. auteur aut IRD Lefèvre Nathalie auteur aut IRD text journalArticle eng text/pdf reformatted digital access The intense rainfall associated with the Intertropical Convergence Zone (ITCZ), a narrow zone of confluence of the northeast and southeast trades, can significantly alter sea surface salinity, the chemistry of inorganic C and the resulting sea-air CO2 exchange in the tropics. We have analyzed extensive underway data collected from 2008 until 2014 and recorded by an autonomous CO2 system installed on a commercial ship that crosses the central tropical Atlantic (5 degrees S to 15 degrees N, 18 degrees W to 36 degrees W) to disentangle the effects of the ITCZ over the carbonate system there. Based on statistically significant linear co-variance of sea surface fugacity of CO2 (fCO(2sw)) and sea surface salinity in the areas affected by the ITCZ, we calculated CO2 drawdown rates associated with the impact of the ITCZ in the central tropical Atlantic ranging from 0.11 +/- 0.02 to 2.35 +/- 0.08 mmol m(-2) d(-1). These were calculated by comparing the observed fCO(2sw) with that expected without surface seawater carbonate system dilution and increase in gas transfer caused by the ITCZ. The observed decrease in fCO(2sw) associated with the freshening caused by the ITCZ is much larger than expected from thermodynamics alone. 59.1 +/- 4.1 % of the total observed CO2 drawdown associated with the ITCZ cannot be explained by abiotic processes. Instead, we found significant negative correlations between underway sea surface salinity and remote-sensed chlorophyll a in the areas affected by the ITCZ. Different to other tropical oceanic basins, the tropical Atlantic receives large amounts of continental dust originated from Africa. Wet dust deposition driven by the ITCZ appears associated with the interannual variability of the CO2 drawdown associated with the ITCZ. Fertilization driven by the ITCZ seems to enhance primary production in the otherwise oligotrophic tropical Atlantic, thus significantly lowering CO2 emissions to the atmosphere. specialized Tropical Atlantic Oceanic carbonate system Sea-air CO2 flux Rainfall Diazotrophy ATLANTIQUE ZONE TROPICALE 032 021 838 4 156592 [15 ] 2022 0048-9697 https://www.documentation.ird.fr/hor/fdi:010085342 10.1016/j.scitotenv.2022.156592 0048-9697 [F B010085342] https://www.documentation.ird.fr/hor/fdi:010085342 https://horizon.documentation.ird.fr/exl-doc/pleins_textes/2022-09/010085342.pdf IRD - Base Horizon / Pleins textes 2022-09-02 2025-02-24 fdi:010085342 fre