Lagrangian model of zooplankton dispersion: numerical schemes comparisons and parameter sensitivity tests |
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Authors: | Zhongfeng Qiu Andrea M Doglioli Yijun He Francois Carlotti |
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Institution: | 1. Key Laboratory of Ocean Circulation and Waves, Institute of Oceanology, CAS, Qingdao, 266071, China 2. Laboratoire d’Océanographie Physique et Biogéochimie, Aix Marseille Université, CNRS, UMR 6535, Marseille, France
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Abstract: | This paper presents two comparisons or tests for a Lagrangian model of zooplankton dispersion: numerical schemes and time
steps. Firstly, we compared three numerical schemes using idealized circulations. Results show that the precisions of the
advanced Adams-Bashfold-Moulton (ABM) method and the Runge-Kutta (RK) method were in the same order and both were much higher
than that of the Euler method. Furthermore, the advanced ABM method is more efficient than the RK method in computational
memory requirements and time consumption. We therefore chose the advanced ABM method as the Lagrangian particle-tracking algorithm.
Secondly, we performed a sensitivity test for time steps, using outputs of the hydrodynamic model, Symphonie. Results show
that the time step choices depend on the fluid response time that is related to the spatial resolution of velocity fields.
The method introduced by Oliveira et al. in 2002 is suitable for choosing time steps of Lagrangian particle-tracking models,
at least when only considering advection. |
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