@article{fdi:010074815,
  title = {{S}ea level interannual variability along the west coast of {I}ndia},
  author = {{S}uresh, {I}. and {V}ialard, {J}{\'e}r{\^o}me and {L}engaigne, {M}atthieu and {I}zumo, {T}akeshi and {P}arvathi, {V}. and {M}uraleedharan, {P}. {M}.},
  editor = {},
  language = {{ENG}},
  abstract = {{I}nterannual sea level anomalies ({SLA}), and the related thermocline variations, along the west coast of {I}ndia ({WCI}) strongly impact the ecosystems, fisheries, and potentially the monsoon rainfall. {H}ere we investigate the mechanisms driving the {WCI} interannual {SLA} using a linear continuously stratified ocean model, which realistically simulates the leading northern {I}ndian {O}cean {SLA} mode associated with the {I}ndian {O}cean {D}ipole ({IOD}). {D}uring, for example, positive {IOD} events, easterly wind anomalies near {S}ri {L}anka in late summer and fall force downwelling coastal {K}elvin waves, which induce positive {WCI} {SLA} within days. {M}eanwhile, equatorial easterlies force upwelling {K}elvin waves that travel to {WCI} through the {B}ay of {B}engal coastal waveguide. {P}art of this opposite signal also transits slowly through the {B}ay of {B}engal interior as {R}ossby waves, eventually yielding negative {SLA} along the {WCI} in winter. {T}he {WCI} {SLA} thus shifts from positive in fall to negative in winter during positive {IOD} events. {P}lain {L}anguage {S}ummary {T}he {I}ndian {O}cean {D}ipole ({IOD}) is the leading mode of {I}ndian {O}cean climate variability and is associated with anomalous winds over the equatorial {I}ndian {O}cean. {A} recent work has demonstrated that {IOD} events could strengthen or inhibit the upwelling of poorly oxygenated waters along the west coast of {I}ndia ({WCI}). {S}uch an upwelling impacts oxygen distribution in the upper layers and can thus have adverse effects on ecosystem and fisheries. {H}ere we explain the mechanisms linking the {IOD} to upwelling along the {WCI}. {IOD} zonal winds in the central equatorial {I}ndian {O}cean produce two opposite signals on {WCI}. {O}ne that travels fast, directly up the {WCI} during summer and fall. {B}ut another opposite-polarity signal follows equator and {B}ay of {B}engal rima part of which transits slowly through the {B}ay of {B}engal interior, eventually reaching the {WCI} and flipping the sign of sea level anomalies there in winter.},
  keywords = {west coast of {I}ndia ; sea level ; interannual variability ; {I}ndian {O}cean {D}ipole ; coastal waveguide ; local and remote forcing ; {OCEAN} {INDIEN} ; {INDE}},
  booktitle = {},
  journal = {{G}eophysical {R}esearch {L}etters},
  volume = {45},
  numero = {22},
  pages = {12440--12448},
  ISSN = {0094-8276},
  year = {2018},
  DOI = {10.1029/2018gl080972},
  URL = {https://www.documentation.ird.fr/hor/fdi:010074815},
}