@article{fdi:010077472,
  title = {{G}eneration of {R}ossby waves off the {C}ape {V}erde {P}eninsula : the role of the coastline},
  author = {{S}irven, {J}. and {M}ignot, {J}uliette and {C}repon, {M}.},
  editor = {},
  language = {{ENG}},
  abstract = {{I}n {D}ecember 2002 and {J}anuary 2003 satellite observations of chlorophyll showed a strong coastal signal along the west {A}frican coast between 10 and 22 degrees {N}. {I}n addition, a wavelike pattern with a wavelength of about 750 km was observed from 20 {D}ecember 2002 and was detectable for 1 month in the open sea, south-west of the {C}ape {V}erde {P}eninsula. {S}uch a pattern suggests the existence of a locally generated {R}ossby wave which slowly propagated westward during this period. {T}his hypothesis was confirmed by analysing sea surface height provided by satellite altimeter during this period. {T}o decipher the mechanisms at play, a numerical study based on a reduced-gravity shallow-water model has first been conducted. {A} wind burst, broadly extending over the region where the offshore oceanic signal is observed, is applied for 5 d. {A} {K}elvin wave quickly develops along the northern edge of the cape, then propagates and leaves the area in a few days. {S}imultaneously, a {R}ossby wave whose characteristics seem similar to the observed pattern forms and slowly propagates westward. {T}he existence of the peninsula limits the extent of the wave to the north. {T}he spatial extent of the wind burst determines the extent of the response and correspondingly the timescale of the phenomenon (about 100 d in the present case). {W}hen the wind burst has a large zonal and small meridional extent, the behaviour of a wave to the north of the peninsula differs from that to the south. {T}hese results are corroborated and completed by an analytical study of a linear reduced-gravity model using a non-{C}artesian coordinate system. {T}his system is introduced to evaluate the potential impact of the coastline shape. {T}he analytical computations confirm that a period of around 100 d can be associated with the observed wave considering the value of the wavelength; they also show that the role of the coastline remains moderate at such timescales. {B}y contrast, when the period becomes shorter (smaller than 20-30 d), the behaviour of the waves is modified because of the shape of the coast. {S}outh of the peninsula, a narrow band of sea isolated from the rest of the ocean by two critical lines appears. {I}ts meridional extent is about 100 km and {R}ossby waves could propagate there towards the coast.},
  keywords = {{SENEGAL} ; {ATLANTIQUE} {EST} ; {CAP} {VERT} {PENINSULE}},
  booktitle = {},
  journal = {{O}cean {S}cience},
  volume = {15},
  numero = {6},
  pages = {1667--1690},
  ISSN = {1812-0784},
  year = {2019},
  DOI = {10.5194/os-15-1667-2019},
  URL = {https://www.documentation.ird.fr/hor/fdi:010077472},
}