@article{fdi:010062263,
  title = {{C}yclogeostrophic balance in the {M}ozambique {C}hannel},
  author = {{P}enven, {P}ierrick and {H}alo, {I}. and {P}ous, {S}. and {M}ari{\'e}, {L}.},
  editor = {},
  language = {{ENG}},
  abstract = {{T}hree methods are proposed for the inclusion of inertia when deriving currents from sea surface height ({SSH}) in the {M}ozambique {C}hannel: gradient wind, perturbation expansion, and an iterative method. {T}hey are tested in a model and applied to satellite altimetry. {F}or an eddy of 25 cm amplitude and 100 km radius, typical of {M}ozambique {C}hannel rings at 18 degrees {S}, the error made with geostrophy is 40% for the anticyclones and 20% for the cyclones. {I}nertia could reach one third of the pressure gradient. {G}eostrophy underestimates subsurface currents by up to 50 cm s(-1), resulting in errors of 30-40%. {T}he iterative method results in errors of <5% for the most part of the structure. {T}he error {RMS} in velocities based on 8 years of model {SSH} is in excess of 30 cm s(-1) for geostrophy and reduces to about 10 cm s(-1) for the gradient wind and iterative methods. {T}he perturbation method is less accurate. {A}pplied to satellite altimetry, the addition of inertia results in a significant increase in velocities for the anticyclones and a decrease for the cyclones. {I}t induces a velocity increase of >50% in {M}ozambique {C}hannel rings. {G}eostrophic {EKE} reaches 1400 cm(2) s(-2), while it attains 1800 cm(2) s(-2) when inertia is added. {A}pplied to the {G}ulf {S}tream, these methods confirm the hypothesis of {M}aximenko and {N}iiler [2006] that centrifugal accelerations should be the main cause for the difference observed between geostrophic and drifter {EKE}. {T}his methodology should result in a net improvement for operational surface ocean currents.},
  keywords = {{MOZAMBIQUE} {CANAL}},
  booktitle = {},
  journal = {{J}ournal of {G}eophysical {R}esearch.{O}ceans},
  volume = {119},
  numero = {2},
  pages = {1054--1067},
  ISSN = {2169-9275},
  year = {2014},
  DOI = {10.1002/2013jc009528},
  URL = {https://www.documentation.ird.fr/hor/fdi:010062263},
}