Animal-Borne Metrics Enable Acoustic Detection of Blue Whale MigrationHighlights d Acoustic monitoring reveals patterns in population-level blue whale song production d Tag-derived metrics provide behavioral context for distinct diel patterns in song d When integrated, tag and acoustic metrics reveal an acoustic signature of migration d Key to discerning timing, plasticity, and drivers of a dispersed migration

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A discrete wavelet transform was applied to satellite altimetry data for the period 1992–2007 off California to decompose the SSH signal into inter‐annual, annual, semi‐annual and shorter period components. For the lowest frequency (inter‐annual) component, a system of alternating quasi‐zonal jets was detected. The jet system was delineated by a north‐south series of quasi‐zonal bands of co‐rotating eddies; that is, the eddies were embedded in a shearing zonal flow. The direction of eddy rotation alternated between adjacent bands. The temporal behavior of the jet system showed the existence of quasi‐stationary states and transitions between them. Observed non‐linear effects of the evolution of the jets included southward drift at about 0.2 cm sec−1, deviations of the jets from the zonal direction, and re‐forming of the jet system through decay and merging of eddy chains.

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