Statistics from Lagrangian observations

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Lagrangian ocean analysis: Fundamentals and practices (2018, methodology): “In practice, double-particle statistics are often implemented in terms of cluster or moment methods which are equivalent to double-particle statistics on the plane (LaCasce, 2008).”
Global Patterns of Mesoscale Eddy Properties and Diffusivities (2014, methodology): “Lagrangian observations, from surface drifters and subsurface ﬂoats, can also be used to estimate diffusivity [review by LaCasce (2008) and Rypina et al. (2012)].”
Submesoscale currents in the ocean (2016, background): “In a power-law wavenumber spectrum regime with EKE(k)∼ k−β , there are associated behaviours for D2(t), as well as for the Lagrangian diffusivity, κL = (1)2 ∂tD(2), and the finite-scale Lyapunov exponent (FSLE) λ, which expresses the exponential rate that parcel pairs increase their separation dista”
Lagrangian Coherent Structures (2015, unknown): “Although relative dispersion as a statistical tool has well-established properties (LaCasce 2008), its spatially discretized nature has prevented attempts to relate its features mathematically to the stability of material surfaces.”