Abstract
Abstract. Offline particle tracking (OPT) is a widely used tool for the
analysis of data in oceanographic research. Given the output of a
hydrodynamic model, OPT can provide answers to a wide variety of research
questions involving fluid kinematics, zooplankton transport, the dispersion
of pollutants, and the fate of chemical tracers, among others. In this
paper, we introduce ROMSPath, an OPT model designed to complement the
Regional Ocean Modeling System (ROMS). Based on the Lagrangian TRANSport
(LTRANS) model (North et al., 2008), ROMSPath is written in Fortran
90 and provides advancements in functionality and efficiency compared to
LTRANS. First, ROMSPath calculates particle trajectories using the ROMS
native grid, which provides advantages in interpolation, masking, and
boundary interaction while improving accuracy. Second, ROMSPath enables
simulated particles to pass between nested ROMS grids, which is an
increasingly popular scheme to simulate the ocean over multiple scales.
Third, the ROMSPath vertical turbulence module enables the turbulent
(diffusion) time step and advection time step to be specified separately,
adding flexibility and improving computational efficiency. Lastly, ROMSPath
includes new infrastructure which enables inputting of auxiliary parameters for added
functionality. In particular, Stokes drift can be input and added to
particle advection. Here we describe the details of these updates and
performance improvements.
Funder
National Science Foundation
Cited by
10 articles.
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