Abstract
In this paper, we analyze the sea surface temperature obtained from the global drifter program. The experimental Fourier power spectrum shows a two-decade power-law behavior as Eθ(f) ∝ f−7/3 in the frequency domain. Dimensional argument suggests a two-dimensional-like Lagrangian forward cascade, in which the enstrophy dissipation ϵΩ is involved. Using the Hilbert–Huang transform and multi-level segment analysis, the measured high-order statistics and the corresponding singularity spectrum confirm the existence of the intermittency with a measured intermittency parameter μθ ≃ 0.10, which is much weaker than the prediction by the conventional structure-function method.
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