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Ocean Science An interactive open-access journal of the European Geosciences Union
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https://doi.org/10.5194/os-2020-61
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/os-2020-61
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

  09 Jul 2020

09 Jul 2020

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A revised version of this preprint is currently under review for the journal OS.

Coastal gradients south of Cape Town: what insights can be gained from mesoscale reanalysis?

Mark R. Jury1,2 Mark R. Jury
  • 1Univ Zululand, South Africa
  • 2Univ Puerto Rico Mayaguez, PR, USA

Abstract. Mesoscale datasets are used to study coastal gradients in the marine climate and oceanography south of Cape Town. Building on past work, satellite and ocean/atmosphere reanalysis are used to gain new insights on the mean structure, circulation and meteorological features. HYCOM v3 hindcasts represent a coastward reduction of mixing that enhances stratification and productivity inshore. The mean summer currents are westward –.4 m/s along the shelf edge and weakly clockwise within False Bay. The marine climate is dominated by southeasterly winds that accelerate over the mountains south of Cape Town and fan out producing dry weather. Virtual buoy time series in Dec 2012–Feb 2013 exhibit weather-pulsed upwelling in early summer interspersed with quiescent spells in late summer. Intercomparisons between model, satellite and station data build confidence that coupled reanalyses yield opportunities to study air-sea interactions in coastal zones with complex topography. The 0.083° HYCOM reanalysis has 16 data points in the embayment south of Cape Town, just adequate to resolve the coastal gradient and its impacts on ocean productivity.

Mark R. Jury

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Mark R. Jury

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Short summary
Mesoscale datasets are used to study coastal gradients in the marine climate and oceanography south of Cape Town. Building on past work, satellite and ocean/atmosphere reanalysis are used to gain new insights on the mean structure, circulation and meteorological features. HYCOM v3 hindcasts represent a coastward reduction of mixing that enhances stratification and productivity in False Bay during summer.
Mesoscale datasets are used to study coastal gradients in the marine climate and oceanography...
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