@article{fdi:010061896,
  title = {{I}nteraction of dipole eddies with the western continental slope of the {M}ozambique {C}hannel},
  author = {{R}oberts, {M}. {J}. and {T}ernon, {J}ean-{F}ran{\c{c}}ois and {M}orris, {T}.},
  editor = {},
  language = {{ENG}},
  abstract = {{S}ea {L}evel {A}nomaly ({SLA}) data were used to track a southward propagating eddy dipole along the western slope of the {M}ozambique {C}hannel over some 6 months. {I}n {A}pril 2005, this dipole (with the cyclone to the south) was close to the continental slope off southern {M}ozambique. {T}he contact zone between the contra-rotating vortices and the slope was surveyed by ship using onboard ({S}-){ADCP} and {CTD} lines. {T}he data showed strong ( > 1.4 m s(-1)) southward (geostrophic) currents over the slope adjacent to the anticyclone with horizontal divergence over the shelf edge. {S}ignificant slope upwelling between the dipole and the shelf was evident, concomitant with enhanced nutrient and chlorophyll levels enriching shelf near-surface waters. {S}atellite observations depicted a 300 km long surface chlorophyll filament extending offshore in the frontal zone between the contra-rotating vortices. {A} satellite-tracked drifter deployed at the coastal base of this filament confirmed the offshore advection of chlorophyll-enriched shelf water, which ultimately wrapped around the cyclone and filling its centre. {T}he slope upwelling was also clearly evident in hourly temperature data collected by a recorder deployed on a nearby reef ({Z}ambia {R}eef) in a depth of 18 m. {A}ccording to the {SLA} data, the dipole took several weeks to pass {Z}ambia {R}eef causing prolonged bouts of upwelling that finally ceased when it left the continental slope and moved southwards into the open ocean. {F}urther analysis showed that lone anticyclones and cyclones against the {M}ozambique continental shelf also induce slope upwelling as a result of horizontal divergence created by the radial circulation of the vortex. {I}n the case of cyclones, the divergence occurs north of the contact zone. {O}verall, this case study confirms that eddies moving southwards along the western side of the {M}ozambique {C}hannel are the main mechanism for pumping nutrients into the otherwise oligotrophic surface waters, and moreover, provide a vigorous mechanism for shelf-open ocean exchange.},
  keywords = {{M}ozambique {C}hannel ; {D}ipole eddies ; {S}lope upwelling ; {C}urrents ; {C}hlorophyll filaments ; {MOZAMBIQUE} {CANAL} ; {OCEAN} {INDIEN}},
  booktitle = {{T}he {M}ozambique channel : mesoscale dynamics and ecosystem responses},
  journal = {{D}eep-{S}ea {R}esearch {P}art {II}.{T}opical {S}tudies in {O}ceanography},
  volume = {100},
  numero = {no sp{\'e}cial},
  pages = {54--67},
  ISSN = {0967-0645},
  year = {2014},
  DOI = {10.1016/j.dsr2.2013.10.016},
  URL = {https://www.documentation.ird.fr/hor/fdi:010061896},
}