@article{fdi:010076123,
  title = {{S}trong intensification of the {A}rabian sea oxygen minimum zone in response to {A}rabian {G}ulf warming},
  author = {{L}achkar, {Z}. and {L}evy, {M}arina and {S}mith, {K}. {S}.},
  editor = {},
  language = {{ENG}},
  abstract = {{T}he highly saline, oxygen-saturated waters of the {A}rabian {G}ulf (hereafter the {G}ulf) sink to intermediate depths (200-300 m) when they enter the {A}rabian {S}ea, ventilating the {W}orld's thickest oxygen minimum zone ({OMZ}). {H}ere, we investigate the impacts of a warming of the {G}ulf consistent with climate change projections on the intensity of this {OMZ}. {U}sing a series of eddy-resolving model simulations, we show that the warming of the {G}ulf waters increases their buoyancy and hence limits their contribution to the ventilation of intermediate depths. {T}his leads to an intensification of the {OMZ} and an increase in denitrification that depletes subsurface nitrate and limits deoxygenation at depth. {T}he projected future concomitant increase of {G}ulf salinity only partially reduces the {OMZ} intensification. {O}ur findings highlight the importance of the {A}rabian marginal seas for the biogeochemistry of the {N}orth {I}ndian {O}cean and stress the need for improving their representation in global climate models. {P}lain {L}anguage {S}ummary {D}issolved oxygen in the ocean is fundamental for marine life. {W}hile relatively abundant in surface waters, oxygen generally declines with depth as it is consumed by organisms' respiration. {I}n certain regions like the {A}rabian {S}ea, oxygen concentrations are too low at depth to support marine animals. {T}hese are known as "oxygen minimum zones" ({OMZ}s). {A}t their core, extreme oxygen depletion known as suboxia can also cause a loss of bioavailable nitrogen, essential for phytoplankton growth. {U}sing a series of computer simulations, we show that the sinking of oxygen-saturated dense waters formed in the {A}rabian {G}ulf contributes to oxygen replenishment of the intermediate depths (200-300 m) in the northern {A}rabian {S}ea, reducing the intensity of the {OMZ} and limiting the volume of its suboxic core. {W}e also show that a warming of the {G}ulf waters consistent with recent observations and future climate projections limits their ability to sink and ventilate the intermediate depths. {T}his results in a strong intensification of the {OMZ} and an important loss of bioavailable nitrogen. {O}ur findings highlight the importance of semienclosed seas like the {A}rabian {G}ulf for the ventilation of the ocean and hence stress the need for improving their representation in climate models.},
  keywords = {{PERSIQUE} {GOLFE} ; {ARABIE} {MER}},
  booktitle = {},
  journal = {{G}eophysical {R}esearch {L}etters},
  volume = {46},
  numero = {10},
  pages = {5420--5429},
  ISSN = {0094-8276},
  year = {2019},
  DOI = {10.1029/2018gl081631},
  URL = {https://www.documentation.ird.fr/hor/fdi:010076123},
}