Impact of mesoscale eddies on water transport between the Pacific Ocean and the Bering Sea

TL;DR

This study investigates how mesoscale eddies and wind stress influence water transport variability between the Pacific Ocean and the Bering Sea through the Near Strait, using satellite data, simulations, and in-situ observations.

Contribution

It provides a comprehensive analysis of mesoscale eddies' role in modulating water flow through the Near Strait over seasonal and interannual timescales.

Findings

Flow through the Near Strait is highly variable and eddy-controlled.

Negative correlation between western and eastern fluxes in seasonal scale.

Wind stress significantly influences interannual transport variability.

Abstract

Sea surface height anomalies observed by satellites in 1993--2012 are combined with simulation and observations by surface drifters and Argo floats to study water flow pattern in the Near Strait (NS) connected the Pacific Ocean with the Bering Sea. Daily Lagrangian latitudinal maps, computed with the AVISO surface velocity field, and calculation of the transport across the strait show that the flow through the NS is highly variable and controlled by mesoscale and submesoscale eddies in the area. On the seasonal scale, the flux through the western part of the NR is negatively correlated with the flux through its eastern part ($r=-0.93$). On the interannual time scale, a significant positive correlation ($r=0.72$) is diagnosed between the NS transport and the wind stress in winter. Increased southward component of the wind stress decreases the northward water transport through the strait. Positive wind stress curl over the strait area in winter--spring generates the cyclonic circulation and thereby enhances the southward flow in the western part ($r=-0.68$) and northward flow in the eastern part ($r=0.61$) of the NR. In fall, the water transport in different parts of the NS is determined by the strength of the anticyclonic mesoscale eddy located in the Alaskan Stream area.