Estimating Lagrangian trajectories from tracer observations and model output
Leonid Piterbarg
University of Southern California
(Abstract received 06/13/2009 for session D)
ABSTRACT
A stable method of low computational cost is suggested for estimating Lagrangian trajectories by combining observations of a continuously distributed conservative tracer and a circulation model output (background velocity field). A theoretical error analysis for a homogeneous flow is provided while for a more sophisticated synthetic flow the error is evaluated numerically. The reduction in error comparatively to the background varies in the range 1%-34% depending on the flow structure. Finally, the method is applied for estimating the absolute and relative dispersion in a gyre perturbed by periodic or stochastic fluctuations.
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