Impacts of Typhoons on the Kuroshio Large Meander: Observation Evidences

TL;DR

This study investigates how typhoons influence the formation and dynamics of the Kuroshio large meander, highlighting the role of typhoon-induced eddies and oceanic interactions in shaping the current's path.

Contribution

It presents observational evidence linking typhoons, cyclonic eddies, and the Kuroshio meander formation, proposing a new mechanism involving typhoon-eddy interactions.

Findings

Typhoons enhance cyclonic eddies, causing drastic Kuroshio meanders.

Typhoons in June 2004 contributed to initial meander formation.

Typhoon-eddy interactions are crucial in Kuroshio path variability.

Abstract

The formation of the Kuroshio large meander in summer 2004 was investigated by using the cruise data, Argo profiles data, and satellite remote sensing data. We validated the point that cyclonic eddy contributes to the large meander. Besides, the impacts of typhoons on Kuroshio meanders were studied. From 29 July to 4 August, the typhoons stirred the ocean and upwelled the deep water, which enhanced the existed cyclonic eddy, and immediately made a drastic meander of the Kuroshio. Moreover, the unexpected typhoons in June 2004 also contributed to the initial meander at Tokara Strait. The result suggests an alternative meander mechanism of Kuroshio path via typhoon-eddy-Kuroshio interactions. It is argued that typhoons accompanied with cyclonic eddies, might play crucial roles in meanders of the Kuroshio. This will provide a more comprehensive understanding of the dynamics of the west boundary flows like the Kuroshio and the Gulf Stream, and will be useful in eddy-resolution models.