%0 Journal Article
%9 ACL : Articles dans des revues avec comité de lecture répertoriées par l'AERES
%A Person, Renaud
%A Vancoppenolle, M.
%A Aumont, Olivier
%A Malsang, M.
%T Continental and sea ice iron sources fertilize the Southern Ocean in synergy
%D 2021
%L fdi:010083849
%G ENG
%J Geophysical Research Letters
%@ 0094-8276
%K iron ; cryosphere ; Southern Ocean ; fertilization ; biological carbon pump ; modeling
%K OCEAN ANTARCTIQUE
%K OCEAN AUSTRAL
%M ISI:000730019700010
%N 23
%P e2021GL094761 [9 ]
%R 10.1029/2021gl094761
%U https://www.documentation.ird.fr/hor/fdi:010083849
%> https://horizon.documentation.ird.fr/exl-doc/pleins_textes/2022-01/010083849.pdf
%V 48
%W Horizon (IRD)
%X 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.
%$ 032 ; 064 ; 020 ; 034