@article{fdi:010061263,
  title = {{SST} subseasonal variability in the central {B}enguela upwelling system as inferred from satellite observations (1999-2009)},
  author = {{G}oubanova, {K}aterina and {I}llig, {S}erena and {M}achu, {E}ric and {G}arcon, {V}. and {D}ewitte, {B}oris},
  editor = {},
  language = {{ENG}},
  abstract = {{S}ubseasonal variability of {S}ea {S}urface {T}emperature ({SST}) in the central {B}enguela upwelling system is investigated using {TMI} satellite-derived data over the period 1999-2009. {S}patial patterns and time-frequency characteristics of subseasonal variability are documented based on {E}mpirical {O}rthogonal {F}unctions ({EOF}) decomposition and wavelet analysis. {D}espite the land contamination of the {TMI} satellite data within approximately 100 km off the coast the first {EOF} of {SST} anomalies allows characterizing the coastal upwelling variability at the subseasonal scale. {T}wo regimes of variability are evidenced: a submonthly (2-30 days) regime with a dominant 11 days oscillation and a lower frequency intraseasonal (30-90 days) regime with a dominant 61 days oscillation. {B}oth regimes are modulated, to a large extent, by the local surface wind stress and are consistent with {E}kman dynamics. {T}he seasonality of the relationship between wind stress and {SST} for submonthly (intraseasonal) regime is characterized by a marked semiannual (annual) cycle, which is explained in terms of the impact of seasonal change of the upper ocean stratification on the vertical advection process. {T}he wind-driven {SST} subseasonal variability is shown to be associated with eastward propagating disturbances in the midlatitudes corresponding to a wave number 4. {T}he results also suggest an important role of the {A}ntarctic {O}scillation in modulating the intraseasonal wind-driven {SST} variability. {T}he characteristics of the equatorial intraseasonal {K}elvin waves are documented in order to discuss possible impact of remote oceanic forcing on {SST} variability along the coast in the {B}enguela upwelling system.},
  keywords = {{B}enguela upwelling ; satellite observations ; intraseasonal variability ; wind-{SST} relationship ; mean vertical stratification ; {A}ntarctic oscillation ; {ATLANTIQUE} {SUD}},
  booktitle = {},
  journal = {{J}ournal of {G}eophysical {R}esearch. {O}ceans},
  volume = {118},
  numero = {9},
  pages = {4092--4110},
  ISSN = {2169-9275},
  year = {2013},
  DOI = {10.1002/jgrc.20287},
  URL = {https://www.documentation.ird.fr/hor/fdi:010061263},
}