Seasonal and Mesoscale Variability of the Kuroshio Near Its Origin
2011
Daniel L. Rudnick | Sen Jan | Luca Centurioni | Craig M. Lee | Ren-Chieh Lien | Joe Wang | Dong-Kyu Lee | Ruo-Shan Tseng | Yoo Yin Kim | Ching-Sheng Chern
The Kuroshio is the most important current in the North Pacific. Here, we present historical data and recent observations of the Kuroshio off the coasts of Taiwan and the Philippine Archipelago, with a focus on its origins. Seasonal climatologies from shipboard hydrographic and velocity measurements, and from surface drifters, demonstrate changes in the Kuroshio caused by the monsoon. In particular, seasonal monsoon forcing affects the degree of penetration of the Kuroshio through Luzon Strait. Data from surface drifters and underwater gliders describe its mesoscale variability. Velocities derived from drifters make clear the mesoscale variability associated with the Subtropical Countercurrent east of the Kuroshio. Underwater gliders document mesoscale structure prominent in salinity extrema associated with water masses. The evolution of these water masses as they progress northward near the Kuroshio indicates strong mixing in the region.
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