Preprints
https://doi.org/10.5194/os-2021-57
https://doi.org/10.5194/os-2021-57

  29 Jun 2021

29 Jun 2021

Review status: a revised version of this preprint is currently under review for the journal OS.

Currents Generated by the Sea Breeze in the Southern Caspian Sea

Mina Masoud and Rich Pawlowicz Mina Masoud and Rich Pawlowicz
  • Dept. of Earth, Ocean and Atmospheric Sciences, University of British Columbia, 2207 Main Mall, Vancouver, B.C. Canada V6T 1Z4

Abstract. The sea breeze system is the dominant atmospheric forcing at high frequency in the southern Caspian Sea. Here, we describe and interpret current meter observations on the continental margins of the southern Caspian from 2013 to 2014 to identify and characterize the water column's response to the sea breeze system. Time series analysis provides evidence for diurnal baroclinic current signals of O (0.02 m s−1) and surface height changes of O (0.03 m). A two-layer model, including interfacial and bottom friction is developed to further investigate the sea breeze response. This model is able to reproduce the structure, amplitudes, and phases of observed diurnal current fluctuations, explaining half of the variance in observational current response at frequencies at 1 cpd and higher. The sea breeze response thus results in a “tide-like” daily cycle which is actually linked to the local forcing all along the southern Caspian coast.

Mina Masoud and Rich Pawlowicz

Status: final response (author comments only)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on os-2021-57', Alexander Rabinovich, 10 Aug 2021
    • AC1: 'Reply to CR1', Mina Masoud, 13 Oct 2021
  • RC2: 'Comment on os-2021-57', Anonymous Referee #2, 16 Sep 2021
    • AC2: 'Reply on RC2', Mina Masoud, 13 Oct 2021

Mina Masoud and Rich Pawlowicz

Mina Masoud and Rich Pawlowicz

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Short summary
Due to the smaller thermal heat capacity of land relative to the sea, resulting in land–sea thermal gradients with a daily cycle, called sea breeze systems, with the same daily periodicity. Since tides in the Caspian as the largest enclosed basine with persistent sea breeze system throught the year are very weak we found out that most of the higher frequency variations in coastal currents are a response to the sea-breeze system.