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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. 3, pp. 221-233

Mesoscale eddies on the continental slope of the New Zealand Plateau based on altimetry data

V.S. Travkin 1, 2 , V.G. Gnevyshev 3 , T.V. Belonenko 1 
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
Accepted: 17.05.2024
DOI: 10.21046/2070-7401-2024-21-3-221-233
The aim of the study is to describe the features of vortex dynamics on the slope of the New Zealand Plateau. It has been established that on the southeastern slope of the New Zealand Plateau, vortex dynamics manifest in the eastward movement of two mesoscale vortex systems — cyclones and anticyclones, with anticyclones moving along the upper boundary of the continental slope and cyclones along the lower boundary. It is shown that the wave approach and exponential profile model allow describing the main characteristics of Rossby topographic waves propagating along the slope of the New Zealand Plateau. The bottom topography of the studied area is characterized by the following features: the New Zealand Plateau, located at a depth of approximately 500 m, sharply drops off to the southeast with a steep slope, beyond which lies the continental basin with depths reaching 5000 m. The gradients of depth changes in the transitional zone from the plateau to the continental basin are 3.75•10 -2. Using the open data available on the CMEMS (Copernicus Marine Environment Monitoring Service) portal, we investigated the characteristics of vortex dynamics in this region. Estimates of the kinematic and dynamic parameters of vortices propagating on the slope of the New Zealand Plateau were obtained. It is shown that the wave approach and exponential profile model allow describing the main characteristics of Rossby topographic waves propagating along the slope of the New Zealand Plateau. For the exponential topography model, a calculation of the spectral eigenvalue problem was performed. Dispersion patterns, dependencies on wave number of phase and group velocities, and flow functions for two modes were constructed. It is demonstrated that the parameters of the vortices correspond to the central part of the dispersion curves, confirming the hypothesis of the topographic origin of the New Zealand Plateau vortices.
Keywords: New Zealand Plateau, Rossby topographic waves, mesoscale eddies, altimetry, exponential model
Full text

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