Trench Aleutian anticyclonic eddies: generation and evolution

<p>Aleutian eddies are mesoscale anticyclonic eddies formed within the Alaskan Stream over the<br>Aleutian trench in the area of 50-52 ° N, 170-175 ° E. It is found that canyons along the shelf<br>fault appear to be more prone to eddy activity than regions without canyons. Aleutian eddies<br>propagate southwestward after the separation from the Alaskan Stream and pass through the<br>Western Subarctic Gyre, carrying the transformed waters of the Gulf of Alaska to the western<br>part of the Pacific Subarctic. Fishermen and oceanographers are well aware of the role of<br>some anticyclonic eddies near the trenches in the formation of places favorable for fishing.<br>They are formed by the mixing of the waters of the Alaskan Stream and the waters of the<br>Subarctic Current. The appearance of Aleutian eddies is accompanied by a deepening of<br>isopycnic surfaces and an increase in temperature and concentration of dissolved oxygen in<br>the layer of 150– 400 m.<br>Based on the GLORYS12V1 data, the thermohaline structure of individual eddies and their<br>dynamic properties are analyzed. The GLORYS12V1 product is a global reanalysis covering<br>altimetry data since 1993. It is based on the existing real-time CMEMS (Copernicus Marine<br>Environment Monitoring Service) global forecasting system. The component of this model is<br>the NEMO platform controlled on the surface by ECMWF ERA-Interim. The observations<br>are then assimilated using a reduced-order Kalman filter. The work uses daily data for 2019<br>"GLOBAL_REANALYSIS_PHY_001_030" displayed on a standard regular grid in 1/12°<br>increments (approximately 8 km) and on 50 standard levels.</p>