Numerical Modelling of Upwelling near the South Coast of Crimea on 24–25 September 2013

V. V. Efimov, D. A. Iarovaya*, V. S. Barabanov

Marine Hydrophysical Institute of RAS, Sevastopol, Russia

* e-mail: darik777@mhi-ras.ru

Abstract

Using 2-km resolution coupled air-sea mesoscale model NOW (NEMO-OASIS-WRF), we studied a case of upwelling in the Black Sea near the South Coast of Crimea on 24–25 September 2013. The NOW model successfully reproduced a sharp decrease of sea surface temperature (SST) by 10 °C within two days. The high spatial resolution in the model allowed us to describe upwelling features resulting from the orography and shape of the coastline. In particular, we found small-scale areas of low SST near the coast where surface wind is directed along the coast to the right, for example over the sea near the coastal Crimean Mountains. At the same time the upwelling does not occur in the areas where the coastal wind has another direction, for example in the north-western part of Karkinit Bay, near the coast north to Sevastopol, and near the Azov coast. It is shown that there is a vertical circulation cell in the sea caused by the upwelling: a rise of the seasonal thermocline near the shore, outflow of warm water in the upper quasi-homogenous layer and descend of water at the 30–50 km distance from the shore. We found that the coastal current has diurnal variation due to breeze circulation: the velocity component perpendicular to the coast reaches its maximum during the daylight hours, whereas velocity component directed along the coast reaches its maximum with a delay of 4–6 hours.

Keywords

mesoscale coupled modelling, wind upwelling, vertical structure of velocity and temperature fields in sea, seasonal thermocline, Black Sea, South Coast of Crimea

Acknowledgments

The work was performed under project no. 0555-2021-0002 “Fundamental studies of processes of interaction in the ocean – atmosphere system which determine the regional spatial-temporal variability of the natural environment and climate”.

For citation

Efimov, V.V., Iarovaya, D.A. and Barabanov, V.S., 2023. Numerical Modelling of Upwelling near the South Coast of Crimea on 24–25 September 2013. Ecological Safety of Coastal and Shelf Zones of Sea, (1), pp. 6–19. doi:10.29039/2413-5577-2023-1-6-19

DOI

10.29039/2413-5577-2023-1-6-19

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