@article{fdi:010088307,
  title = {{T}he land-sea breeze influences the oceanography of the southern {B}enguela upwelling system at multiple time-scales},
  author = {{F}earon, {G}. and {H}erbette, {S}. and {C}ambon, {G}ildas and {V}eitch, {J}. and {M}eynecke, {J}. {O}. and {V}ichi, {M}.},
  editor = {},
  language = {{ENG}},
  abstract = {{T}he physical and biogeochemical functioning of eastern boundary upwelling systems is generally understood within the context of the upwelling - relaxation cycle, driven by sub-diurnal wind variability (i.e. with a time-scale of greater than a day). {H}ere, we employ a realistically configured and validated 3{D} model of the southern {B}enguela upwelling system to quantify the impact of super-diurnal winds associated with the land-sea breeze ({LSB}). {T}he ocean response to the {LSB} is found to be particularly enhanced within {S}t {H}elena {B}ay ({SHB}), a hotspot for productivity which is also prone to {H}armful {A}lgal {B}loom ({HAB}) development. {W}e attribute the enhanced response to a combination of near-critical latitude for diurnal-inertial resonance (similar to 32.5 degrees {S}), the local enhancement of the {LSB}, and the local development of a shallow stratified surface layer through bay retention. {P}ronounced advection of the surface layer by diurnal-inertial oscillations contributes to large differences in day- and night-time sea surface temperatures ({SST}'s) (more than 2 degrees {C} on average in {SHB}). {E}vent-scale diapycnal mixing is particularly enhanced within {SHB}, as highlighted by a numerical experiment initialised with a subsurface passive tracer. {T}hese super-diurnal processes are shown to influence sub-diurnal dynamics within {SHB} through their modulation of the vertical water column structure. {A} deeper thermocline retains the upwelling front closer to land during active upwelling, while geostrophically-driven alongshore flow is impacted through the modulation of cross-shore pressure gradients. {T}he results suggest that the {LSB} is likely to play an important role in the productivity and therefore {HAB} development within {SHB}, and highlight potential challenges for observational systems and models aiming to improve our understanding of the physical and biological functioning of the system.},
  keywords = {land-sea breeze ; diurnal-inertial oscillations ; vertical mixing ; critical latitude ; coastal upwelling ; southern {B}enguela ; {ATLANTIQUE} ; {BENGUELA} {COURANT}},
  booktitle = {},
  journal = {{F}rontiers in {M}arine {S}cience},
  volume = {10},
  numero = {},
  pages = {1186069 [19 p.]},
  year = {2023},
  DOI = {10.3389/fmars.2023.1186069},
  URL = {https://www.documentation.ird.fr/hor/fdi:010088307},
}