@article{fdi:010079703, title = {{O}cean acidification from below in the {T}ropical {P}acific}, author = {{I}shii, {M}. and {R}odgers, {K}. {B}. and {I}noue, {H}. {Y}. and {T}oyama, {K}. and {S}asano, {D}. and {K}osugi, {N}. and {O}no, {H}. and {E}nyo, {K}. and {N}akano, {T}. and {I}udicone, {D}. and {B}lanke, {B}. and {A}umont, {O}livier and {F}eely, {R}. {A}.}, editor = {}, language = {{ENG}}, abstract = {{I}dentifying ocean acidification and its controlling mechanisms is an important priority within the broader question of understanding how sustained anthropogenic {CO}(2)emissions are harming the health of the ocean. {T}hrough extensive analysis of observational data products for ocean inorganic carbon, here we quantify the rate at which acidification is proceeding in the western tropical {P}acific {W}arm {P}ool, revealing -0.0013 +/- 0.0001 year(-1)for p{H} and -0.0083 +/- 0.0007 year(-1)for the saturation index of aragonite for the years 1985-2016. {H}owever, the mean rate of total dissolved inorganic carbon increase (+0.81 +/- 0.06 mu mol . kg(-1) . year(-1)) sustaining acidification was similar to 20% slower than what would be expected if it were simply controlled by the rate of atmospheric {CO}2 increase and transmitted through local air-sea {CO}(2)equilibration. {J}oint {L}agrangian and {E}ulerian model diagnostics indicate that the acidification of the {W}arm {P}ool occurs primarily through the anthropogenic {CO}2 that invades the ocean in the extra-tropics is transported to the tropics through the thermocline shallow overturning circulation and then re-emerges into surface waters within the tropics through the {E}quatorial {U}ndercurrent from below. {A}n interior residence time of several years to decades, acting in conjunction with the accelerating {CO}(2)growth in the atmosphere, can be expected to contribute to modulating the rate of {W}arm {P}ool acidification.}, keywords = {{PACIFIQUE} ; {ZONE} {TROPICALE}}, booktitle = {}, journal = {{G}lobal {B}iogeochemical {C}ycles}, volume = {34}, numero = {8}, pages = {e2019{GB}006368 [15 ]}, ISSN = {0886-6236}, year = {2020}, DOI = {10.1029/2019gb006368}, URL = {https://www.documentation.ird.fr/hor/fdi:010079703}, }