Preprints
https://doi.org/10.5194/os-2022-1
https://doi.org/10.5194/os-2022-1
 
20 Jan 2022
20 Jan 2022
Status: this preprint is currently under review for the journal OS.

Mechanism of generation and propagation characteristics of coastal trapped waves in the Black Sea

Müjdat Aydın and Şükrü Turan Beşiktepe Müjdat Aydın and Şükrü Turan Beşiktepe
  • Institute of Marine Sciences and Technology, Dokuz Eylul University, 35340, Izmir, Turkey

Abstract. Coastal trapped waves (CTW) were investigated in the Black Sea during 2012–2016 using observations from the sea level stations at five locations along the southern coast of the Black Sea together with the sea surface height model from Copernicus Marine Service. Spectral and wavelet analysis of sea level data shows that CTWs exist in the Black Sea with a period of 12–13 days and 15 days duration. These waves propagate from west to east with a speed of 2.3–2.6 m s−1 and cause 10–20 cm variability in sea level. To investigate formation mechanisms of CTWs, sea surface height and surface velocities from Copernicus Marine Service, wind measurements from sea level stations and atmospheric model results from Copernicus Marine Service are jointly analyzed. These analyses showed that CTWs were formed when water accumulated on the western shelf after gale force alongshore winds blowing in the western Black Sea. Our results provide clear observational evidence on process of the excitement of CTWs by wind stress. CTWs generate a coastal current reaching up to 0.5 m s−1. This coastal current joins to large-scale cyclonic inertial current flowing over the continental slope and accelerates it. Hence, we present evidence on the influence of the CTWs on the large scale circulation.

Müjdat Aydın and Şükrü Turan Beşiktepe

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-2022-1', Anonymous Referee #1, 11 Feb 2022
    • AC1: 'Reply on RC1', Şükrü Beşiktepe, 08 Mar 2022
  • RC2: 'Comment on os-2022-1', Emil Stanev, 14 Feb 2022
    • AC2: 'Reply on RC2', Şükrü Beşiktepe, 08 Mar 2022

Müjdat Aydın and Şükrü Turan Beşiktepe

Müjdat Aydın and Şükrü Turan Beşiktepe

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Short summary
This study provides observational evidence and dynamical reasoning for the sub inertial waves in the Black Sea using a series of sea level data and Black Sea Reanalysis products from Copernicus Marine Environment Monitoring Services. These waves were generated by the strong alongshore winds blowing during the autumn-winter and cause 10–20 cm variability in sea level. It accelerates the coastal current and quickly transfers waters from west to east.