@article{fdi:010088256, title = {{N}atural iron fertilization by shallow hydrothermal sources fuels diazotroph blooms in the ocean}, author = {{B}onnet, {S}ophie and {G}uieu, {C}. and {T}aillandier, {V}. and {B}oulart, {C}. and {B}ouruet-{A}ubertot, {P}. and {G}azeau, {F}. and {S}calabrin, {C}. and {B}ressac, {M}. and {K}napp, {A}. {N}. and {C}uypers, {Y}. and {G}onzalez-{S}antana, {D}. and {F}orrer, {H}. {J}. and {G}risoni, {J}. {M}. and {G}rosso, {O}. and {H}abasque, {J}{\'e}r{\'e}mie and {J}ardin-{C}amps, {M}. and {L}eblond, {N}. and {L}e {M}oigne, {F}. {A}. {C}. and {L}ebourges {D}haussy, {A}nne and {L}ory, {C}aroline and {N}unige, {S}. and {P}ulido-{V}illena, {E}. and {R}izzo, {A}. {L}. and {S}arthou, {G}. and {T}illiette, {C}.}, editor = {}, language = {{ENG}}, abstract = {{I}ron is an essential nutrient that regulates productivity in similar to 30% of the ocean. {C}ompared with deep (>2000 meter) hydrothermal activity at mid-ocean ridges that provide iron to the ocean's interior, shallow (<500 meter) hydrothermal fluids are likely to influence the surface's ecosystem. {H}owever, their effect is unknown. {I}n this work, we show that fluids emitted along the {T}onga volcanic arc ({S}outh {P}acific) have a substantial impact on iron concentrations in the photic layer through vertical diffusion. {T}his enrichment stimulates biological activity, resulting in an extensive patch of chlorophyll (360,000 square kilometers). {D}iazotroph activity is two to eight times higher and carbon export fluxes are two to three times higher in iron-enriched waters than in adjacent unfertilized waters. {S}uch findings reveal a previously undescribed mechanism of natural iron fertilization in the ocean that fuels regional hotspot sinks for atmospheric {CO}2.}, keywords = {{TONGA} ; {PACIFIQUE} {SUD}}, booktitle = {}, journal = {{S}cience}, volume = {380}, numero = {6647}, pages = {812--817}, ISSN = {0036-8075}, year = {2023}, DOI = {10.1126/science.abq4654}, URL = {https://www.documentation.ird.fr/hor/fdi:010088256}, }