@article{fdi:010061866,
  title = {{I}mprovements of simulated {W}estern {N}orth {A}tlantic current system and impacts on the {AMOC}},
  author = {{T}alandier, {C}. and {D}eshayes, {J}ulie and {T}reguier, {A}. {M}. and {C}apet, {X}. and {B}enshila, {R}. and {D}ebreu, {L}. and {D}ussin, {R}. and {M}olines, {J}. {M}. and {M}adec, {G}.},
  editor = {},
  language = {{ENG}},
  abstract = {{P}revious studies have shown that low horizontal resolution (of the order of 1 degrees) ocean models, hence climate models, are not able to adequately represent boundary currents nor mesoscale processes which affect the dynamics and thermohaline circulation of the ocean. {W}hile the effect of mesoscale eddies can be parameterized in low resolution models, boundary currents require relatively high horizontal resolution. {W}e clarify the impact of increasing the resolution on the {N}orth {A}tlantic circulation, with emphasis on the {A}tlantic {M}eridional {O}verturning {C}irculation ({AMOC}), by embedding a 1/8 degrees nest covering the {N}orth {A}tlantic into a global 1/2 degrees model. {I}ncreasing the resolution in the nest leads to regional improvements of the circulation and thermohaline properties in the {G}ulf {S}tream area, for the {N}orth {A}tlantic {C}urrent, in the subpolar gyre and the {N}ordic {S}eas, consistent with those of previous studies. {I}n addition, we show that the {D}eep {W}estern {B}oundary {C}urrent dense water transport increases with the nest, from the overflows down to {F}lemish {C}ap, due to an increase in the {D}enmark {S}trait overflow as well as dense water formation in the subpolar gyre. {T}his increases the {A}tlantic {M}eridional {O}verturning {C}irculation in density space by about 8 {S}v in the subpolar gyre in the nested configuration. {W}hen exiting the {L}abrador {S}ea around 53 degrees {N} we illustrate that the {D}eep {W}estern {B}oundary {C}urrent successively interacts with the upper ocean circulation composed with the {N}orth {A}tlantic {C}urrent in the intergyre region, the {N}orthern {R}ecirculation {G}yre, and the {G}ulf {S}tream near {C}ape {H}atteras. {T}his surface/deep current interaction seems to induce an increase of the {AMOC} intensity in depth-space, giving rise to an {AMOC} maximum near 35 degrees {N}. {T}his process is missing in the configuration without nesting. {A}t 26.5 degrees {N}, the {AMOC} is 4 {S}v larger in the nested configuration and is in good agreement with observations. {F}inally, beyond the nest imprint (i.e. in the low resolution area) in the {S}outh {A}tlantic the {AMOC} maximum at 40 degrees {S} is 3 {S}v larger at the end of the simulation meaning that information is able to propagate outside the nest without being fully damped. {T}his underlines the benefit of using the nest for a reasonable computing time compared to a fully global higher resolution configuration.},
  keywords = {{D}eep {W}estern {B}oundary {C}urrent ; {A}tlantic {M}eridional {O}verturning ; {C}irculation ; {N}orth {A}tlantic {C}urrent ; {G}ulf {S}tream ; {S}ubpolar gyre ; {ATLANTIQUE} {NORD} {OUEST}},
  booktitle = {},
  journal = {{O}cean {M}odelling},
  volume = {76},
  numero = {},
  pages = {1--19},
  ISSN = {1463-5003},
  year = {2014},
  DOI = {10.1016/j.ocemod.2013.12.007},
  URL = {https://www.documentation.ird.fr/hor/fdi:010061866},
}