@article{fdi:010067606,
  title = {{W}ind changes above warm {A}gulhas {C}urrent eddies},
  author = {{R}ouault, {M}. and {V}erley, {P}hilippe and {B}ackeberg, {B}.},
  editor = {},
  language = {{ENG}},
  abstract = {{S}ea surface temperature ({SST}) estimated from the {A}dvanced {M}icrowave {S}canning {R}adiometer {E} onboard the {A}qua satellite and altimetry-derived sea level anomalies are used south of the {A}gulhas {C}urrent to identify warm core mesoscale eddies presenting a distinct {SST} perturbation greater than to 1 degrees {C} to the surrounding ocean. {T}he analysis of twice daily instantaneous charts of equivalent stability-neutral wind speed estimates from the {S}ea{W}inds scatterometer onboard the {Q}uik{S}cat satellite collocated with {SST} for six identified eddies shows stronger wind speed above the warm eddies than the surrounding water in all wind directions, if averaged over the lifespan of the eddies, as was found in previous studies. {H}owever, only half of the cases showed higher wind speeds above the eddies at the instantaneous scale; 20% of cases had incomplete data due to partial global coverage by the scatterometer for one path. {F}or cases where the wind is stronger above warm eddies, there is no relationship between the increase in surface wind speed and the {SST} perturbation, but we do find a linear relationship between the decrease in wind speed from the centre to the border of the eddy downstream and the {SST} perturbation. {SST} perturbations range from 1 to 6 degrees {C} for a mean eddy {SST} of 15.9 degrees {C} and mean {SST} perturbation of 2.65 degrees {C}. {T}he diameter of the eddies range from 100 to 250 km. {M}ean background wind speed is about 12 ms(-1) (mostly southwesterly to northwesterly) and ranging mainly from 4 to 16 ms(-1). {T}he mean wind increase is about 15 %, which corresponds to 1.8 ms(-1). {A} wind speed increase of 4 to 7 ms(-1) above warm eddies is not uncommon. {C}ases where the wind did not in-higher wind speeds and occurred during a cold front associated with intense cyclonic low-pressure systems, suggesting certain synoptic conditions need to be met to allow for the development of wind speed anomalies over warm-core ocean eddies. {I}n many cases, change in wind speed above eddies was masked by a large-scale synoptic wind speed deceleration/acceleration affecting parts of the eddies.},
  keywords = {{AFRIQUE} {DU} {SUD} ; {AGULHAS} {COURANT} ; {OCEAN} {AUSTRAL}},
  booktitle = {},
  journal = {{O}cean {S}cience},
  volume = {12},
  numero = {2},
  pages = {495--506},
  ISSN = {1812-0784},
  year = {2016},
  DOI = {10.5194/os-12-495-2016},
  URL = {https://www.documentation.ird.fr/hor/fdi:010067606},
}