Person Renaud auteur aut IRD Vancoppenolle M. auteur aut IRD Aumont Olivier auteur aut IRD Malsang M. auteur aut IRD text journalArticle eng text/pdf reformatted digital access Iron release from melting continental and sea ice is deemed important for phytoplankton, the growth of which is iron-limited in the Southern Ocean. Both sources are generally considered separately, yet their effects on the biological carbon pump could interact. Using a global ocean-sea-ice-biogeochemical model with a representation of both continental and sea ice iron sources, we find them to have an overall additive effect on phytoplankton activity, increasing carbon export by +13.9% of the Southern Ocean total, with continental ice contributing +4.5% and sea ice +8.0%. The +1.4% residual is due to a coupled fertilization effect: When the iron source from continental ice is activated, iron in sea ice increases by 16%, so does iron transport toward low production areas. Overall, this increases phytoplankton activity: Fertilization is more efficient where sea ice melts than at locations of initial iron release by continental ice. specialized iron cryosphere Southern Ocean fertilization biological carbon pump modeling OCEAN ANTARCTIQUE 032 064 020 034 48 23 e2021GL094761 [9 ] 2021 0094-8276 https://www.documentation.ird.fr/hor/fdi:010083849 10.1029/2021gl094761 0094-8276 [F B010083849] https://www.documentation.ird.fr/hor/fdi:010083849 https://horizon.documentation.ird.fr/exl-doc/pleins_textes/2022-01/010083849.pdf IRD - Base Horizon / Pleins textes 2022-01-12 2025-02-24 fdi:010083849 fre