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ISSN 2070-7401 (Print), ISSN 2411-0280 (Online)
Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa
CURRENT PROBLEMS IN REMOTE SENSING OF THE EARTH FROM SPACE

  

Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa, 2023, Vol. 20, No. 2, pp. 262-272

Numerical modelling of interaction between Novorossiysk bora and upper layer of the Black Sea

D.A. Iarovaia 1 , V.V. Efimov 1 
1 Marine Hydrophysical Institute RAS, Sevastopol, Russia
Accepted: 05.04.2023
DOI: 10.21046/2070-7401-2023-20-2-262-272
We study the reaction of the Black Sea upper layer to the sharp intensification of the surface wind near the Caucasian coast during Novorossiysk bora in 20–22 August 2005. This case is studied using coupled mesoscale air-sea model NOW (NEMO — Nucleus for European Modelling of the Ocean, OASIS — Ocean Atmosphere Sea Ice Soil, WRF — Weather Research and Forecasting) with spatial resolution of 1 km. Modelling results are compared with the available observation data. Vertical structure of wind and temperature fields of the bora is studied. Using modelling results, we consider various reasons for the significant, more than 6 °C, drop of the sea surface temperature (SST) near Novorossiysk during 20–22 August. We consider various factors of the SST decrease, such as: vertical turbulent mixing and the entrainment of cold water from the thermocline into the upper quasihomogenous layer; ascend of cold water from lower levels and horizontal advection of water; latent and sensible heat fluxes from the sea surface. It is concluded, that the main reason for the SST decrease was dynamical instability in the sea upper layer, whereas temperature advection and sea-atmosphere heat exchange did not play an important role.
Keywords: Novorossiysk bora, coupled mesoscale modelling
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