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https://doi.org/10.5194/os-2018-32
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/os-2018-32
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

  03 May 2018

03 May 2018

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This preprint has been withdrawn by the authors.

Seasonal and synoptic variability of diurnal currents in an upwelling system off northern Chile near 30° S

Mónica Bello1,2, Marcel Ramos3,4,5,6, René Garreaud1,2, Luis Bravo3,4, and Martin Thiel3,4,5 Mónica Bello et al.
  • 1Departamento de Geofísica, Universidad de Chile, Santiago, Chile
  • 2Center of Climate and Resilience Research, Universidad de Chile, Santiago, Chile
  • 3Departamento de Biología Marina, Facultad de Ciencias del Mar, Universidad Católica del Norte, Coquimbo, Chile
  • 4Millennium Nucleus for Ecology and Sustainable Management of Oceanic Islands (ESMOI), Universidad Católica del Norte, Coquimbo, Chile
  • 5Centro de Estudios Avanzado de Zona Aridas, Coquimbo, Chile
  • 6Centro de Innovación Acuícola Aquapacífico, Coquimbo, Chile

Abstract. This study documents the seasonal and synoptic variability of diurnal currents in northern-central Chile (~ 30° S), using current measurements from four sites collected over more than one year. The study area includes a coastal upwelling center well exposed to sea wind and a large bay system (~ 100 km long) located just north of the above mentioned upwelling center. This bay system consists of several smaller bays with different orientations and morphologies, which affect the internal hydrodynamics and favor local recirculation patterns. Inertial oscillations in the area have a period of ~ 24 h, which is the same as that of the periodic wind forcing due to the sea breeze, and thus, this coupling may cause system resonance, as has been reported in other regions. The most intense diurnal currents (with amplitudes of ~ 30 cm s−1) were recorded in the surface layer in one of the areas exposed to the wind and farthest from the coastline (to ~ 22 km). In contrast, within the bay system, which is sheltered from the wind, diurnal currents were less intense (~ 10 cm s−1). Diurnal currents had higher seasonal variability in the more exposed areas than in the protected ones and were more intense in spring and summer than in autumn and winter. This was consistent with the Lagrangian measurements of the surface currents, which showed a higher diurnal energy in summer than in winter. The diurnal wind variability was modulated by the synoptic-scale circulation, which directly affected the diurnal current response. Under upwelling-favorable winds, diurnal currents were mainly forced by daily wind variations due to the sea breeze, while a sudden decrease in wind speed generated inertial oscillations that decayed with depth, especially in the area farthest from the coast. In general, the greatest variability in the diurnal currents occurs in the most exposed area to the wind and farthest from the coast, due to resonance between diurnal wind forcing and inertial oscillations, and possibly by near-diurnal internal gravity waves.

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Mónica Bello et al.

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Mónica Bello et al.

Mónica Bello et al.

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Short summary
Here we present results of an intensive physical oceanography study near 30° S focused on the description of the seasonal and the synoptic variability of diurnal currents. The study, highlights the greatest variability of the diurnal currents which are highly influenced by the diurnal wind forcing, also modulated by a synoptic-scale circulation pattern. Our results show that the highest diurnal current variability suggesting a strong coupling between diurnal wind forcing and inertial oscillations.
Here we present results of an intensive physical oceanography study near 30° S focused on the...
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