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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, 2024, Vol. 21, No. 6, pp. 253-266

Influence of topography on the movement of mesoscale eddies along the continental slope of the New Zealand Plateau

T.V. Belonenko 1 , V.S. Travkin 1, 2 , V.G. Gnevyshev 3 , A.V. Kochnev 4 
1 Saint Petersburg State University, Saint Petersburg, Russia
2 N. N. Zubov’s State Oceanographic Institute, Moscow, Russia
3 P.P. Shirshov Institute of Oceanology RAS, Moscow, Russia
4 Northern (Arctic) Federal University, Arkhangelsk, Russia
Accepted: 07.10.2024
DOI: 10.21046/2070-7401-2024-21-6-253-266
This paper examines mesoscale eddies along the slope of the New Zealand Plateau. The study is based on altimetric measurements from 1993 to 2022: absolute dynamic topography and the META3.2 product. Additionally, data from the global oceanic reanalysis GLORYS12V1 for the same period are used. It is shown that a jet topographic flow is formed on the slope of the New Zealand Plateau, which runs along the slope in a narrow strip. The velocities of this topographic flow reach 70 cm/s when averaged over 1993–2022. It has been established that the generation of mesoscale eddies mainly occurs on the periphery of the topographic flow. Anticyclones are formed on the northern (shallow) periphery of the flow, and cyclones are generated on the southern (deep-water) periphery. The section across the slope is considered, and its parts where the flow velocity components normal to the section are maximal are determined. The trajectories of 1401 cyclones and 1488 anticyclones isolated from 1993–2022 with a life expectancy exceeding 10 days are analyzed. It is shown that the trajectories of cyclones and anticyclones are controlled by topography. In most cases, the trajectories of cyclones and anticyclones have a similar shape and are spaced apart.
Keywords: New Zealand Plateau, seafloor topography, slope, topographic flow, mesoscale eddies, altimetry
Full text

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