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Coastal Submesoscale Eddy Distortion and Its Impacts on the Cross-Shore and Vertical Tracer Transport
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DOI：10.1029/2025JC022351.png)
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Abstract
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Numerous eddies in the coastal ocean may experience distortion due to interactions with the ambient flow. Here we investigate how coastal submesoscale eddy distortion affects the cross-shore and vertical tracer transport using a high-resolution, wave-current coupled model in the La Jolla Canyon region within the Southern California Bight. Model dye is released representing freshwater discharges. Model validations show that the coupled model has weaker stratification and weaker currents. Analyses primarily focus on an eddy-induced cross-shore dye transport event. The results show that, the coastal eddy is squeezed in the alongshore direction and extends in the cross-shore direction, driving cross-shore dye transport. Along a mid-shelf boundary, the total cross-shore transport is found to be dominated by the along-boundary perturbation flow, which is linked to the eddy distortion. In addition, this coastal eddy also possesses vigorous vertical motions. The vertical velocity is more negative on the eddy northern side, favoring local dye subduction. This N-S vertical velocity asymmetry may largely be induced by the topographic beta effect and the weaker modeled stratification may strengthen this effect. Overall, coastal eddy distortion contributes to the offshore tracer transport and induces spatially non-uniform vertical dye flux.
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