@article{fdi:010092664,
  title = {{A}ssessing the future {ODYSEA} satellite mission for the estimation of ocean surface currents, wind stress, energy fluxes, and the mechanical coupling between the ocean and the atmosphere},
  author = {{L}arrañaga, {M}. and {R}enault, {L}ionel and {W}ineteer, {A}. and {C}ontreras, {M}. and {A}rbic, {B}. {K}. and {B}ourassa, {M}. {A}. and {R}odriguez, {E}.},
  editor = {},
  language = {{ENG}},
  abstract = {{O}ver the past decade, several studies based on coupled ocean-atmosphere simulations have shown that the oceanic surface current feedback to the atmosphere ({CFB}) leads to a slow-down of the mean oceanic circulation and, overall, to the so-called eddy killing effect, i.e., a sink of kinetic energy from oceanic eddies to the atmosphere that damps the oceanic mesoscale activity by about 30%, with upscaling effects on large-scale currents. {D}espite significant improvements in the representation of western boundary currents and mesoscale eddies in numerical models, some discrepancies remain when comparing numerical simulations with satellite observations. {T}hese discrepancies include a stronger wind and wind stress response to surface currents and a larger air-sea kinetic energy flux from the ocean to the atmosphere in numerical simulations. {H}owever, altimetric gridded products are known to largely underestimate mesoscale activity, and the satellite observations operate at different spatial and temporal resolutions and do not simultaneously measure surface currents and wind stress, leading to large uncertainties in air-sea mechanical energy flux estimates. {ODYSEA} is a new satellite mission project that aims to simultaneously monitor total surface currents and wind stress with a spatial sampling interval of 5 km and 90% daily global coverage. {T}his study evaluates the potential of {ODYSEA} to measure surface winds, currents, energy fluxes, and ocean-atmosphere coupling coefficients. {T}o this end, we generated synthetic {ODYSEA} data from a high-resolution coupled ocean-wave-atmosphere simulation of the {G}ulf {S}tream using {ODYSIM}, the {D}oppler scatterometer simulator for {ODYSEA}. {O}ur results indicate that {ODYSEA} would significantly improve the monitoring of eddy kinetic energy, the kinetic energy cascade, and air-sea kinetic energy flux in the {G}ulf {S}tream region. {D}espite the improvement over the current measurements, the estimates of the coupling coefficients between surface currents and wind stress may still have large uncertainties due to the noise inherent in {ODYSEA}, and also due to measurement capabilities related to wind stress. {T}his study evidences that halving the measurement noise in surface currents would lead to a more accurate estimation of the surface eddy kinetic energy and wind stress coupling coefficients. {S}ince measurement noise in surface currents strongly depends on the square root of the transmit power of the {D}oppler scatterometer antenna, noise levels can be reduced by increasing the antenna length. {H}owever, exploring other alternatives, such as the use of neural networks, could also be a promising approach. {A}dditionally, the combination of wind stress estimation from {ODYSEA} with other satellite products and numerical simulations could improve the representation of wind stress in gridded products. {F}uture efforts should focus on the assessment of the potential of {ODYSEA} in quantifying the production of eddy kinetic energy through horizontal energy fluxes and air-sea energy fluxes related to divergent and rotational motions.},
  keywords = {{ODYSEA} ; {D}oppler scatterometer ; surface currents ; wind stress ; eddy ; kinetic energy ; horizontal energy fluxes ; wind work ; coupling ; coefficients ; {ATLANTIQUE} ; {ATLANTIQUE} {NORD}},
  booktitle = {},
  journal = {{R}emote {S}ensing},
  volume = {17},
  numero = {2},
  pages = {302 [27 p.]},
  year = {2025},
  DOI = {10.3390/rs17020302},
  URL = {https://www.documentation.ird.fr/hor/fdi:010092664},
}