Biological activity in the wake of an island close to a coastal upwelling

Details Biological activity in the wake of an island close to a coastal upwelling Biological activity in the wake of an island close to a coastal upwelling

2008-02-24

arxiv.org/abs/0802.3532v1

Ecological Complexity 5, 228-237 (2008)

Nonlinear Sciences

Chaotic Dynamics

42 pages, 9 figures

Scientific paper

10.1016/j.ecocom.2008.01.003

Hydrodynamic forcing plays an important role in shaping the dynamics of marine organisms, in particular of plankton. In this work we study the planktonic biological activity in the wake of an island which is close to an upwelling region. Our research is based on numerical analysis of a kinematic flow mimicking the hydrodynamics in the wake, coupled to a three-component plankton model. Depending on model parameters different phenomena are described: a) The lack of transport of nutrients and plankton across the wake, so that the influence of upwelling on primary production on the other side of the wake is blocked. b) For sufficiently high vorticity, the role of the wake in facilitating this transport and leading to an enhancement of primary production. Finally c) we show that under certain conditions the interplay between wake structures and biological growth leads to plankton blooms inside mesoscale hydrodynamic vortices that act as incubators of primary production.

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