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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. 1, pp. 286-298

Mesoscale eddies in the South Pacific Ocean

V.S. Travkin 1, 2 , T.V. Belonenko 1 , A.V. Kochnev 3 , V.N. Feoktistova 1 
1 Saint Petersburg State University, Saint Petersburg, Russia
2 N. N. Zubov’s State Oceanographic Institute, Moscow, Russia
3 Northern (Arctic) Federal University, Arkhangelsk, Russia
Accepted: 19.12.2023
DOI: 10.21046/2070-7401-2024-21-1-286-298
The paper analyzes the properties and trajectories of mesoscale eddies in the South Pacific Ocean. The study region is the area adjacent to the coast of South America: 20–50° S, 70–120° W. Two types of data are used for the analysis: Atlas of mesoscale eddy trajectories META3.2 DT created on the basis of satellite altimetry information, and GLORYS12V1 reanalysis of the World Ocean, which is used to construct average current fields and thermohaline characteristics. It has been established that the maximum number of mesoscale eddies is formed in the coastal zone, on the slopes of the Peruvian and Chilean trenches. The average values of the number of eddies per one 1×1° cell (in latitude and longitude) are calculated and the spatial distribution of this characteristic as well as eddy and average kinetic energy in the region are described. There is a meridional displacement of eddies as they move west: cyclones to the South Pole, anticyclones to the equator. Diagrams of average values of eddy characteristics show that most vortices have radii of 50–75 km, amplitudes exceeding 5 cm, orbital velocities of 5–15 cm/s and a lifetime not exceeding 50 days. The features of long-lived mesoscale eddies with lifetimes exceeding 1 and 2 years are analyzed.
Keywords: mesoscale eddies, South Pacific, altimetry, cyclones, anticyclones, META3.2 DT
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