Predator-prey plankton dynamics in turbulent wakes behind islands

Jaccod, Alice; Berti, Stefano; Calzavarini (Admin), Enrico; Chibbaro, Sergio

Type de document :

Communication dans un congrès avec actes

DOI :

10.5194/egusphere-egu21-2588

Titre :

Predator-prey plankton dynamics in turbulent wakes behind islands

Auteur(s) :

Jaccod, Alice [Auteur]
Institut Jean Le Rond d'Alembert [DALEMBERT]
Berti, Stefano [Auteur]
Unité de Mécanique de Lille - ULR 7512 [UML]
Calzavarini (Admin), Enrico [Auteur]

Unité de Mécanique de Lille - ULR 7512 [UML]
Chibbaro, Sergio [Auteur]
Institut Jean Le Rond d'Alembert [DALEMBERT]

Titre de la manifestation scientifique :

vEGU General Assembly 2021

Ville :

Vienna

Pays :

Autriche

Date de début de la manifestation scientifique :

2021-04-19

Date de publication :

2021-03-03

Discipline(s) HAL :

Science non linéaire [physics]

Résumé en anglais : [en]

Plankton constitutes the productive base of marine ecosystems and plays an important role in the global carbon dioxide cycle through the process of photosynthesis.&#160;The impact of ocean hydrodynamic conditions ...
Lire la suite >Plankton constitutes the productive base of marine ecosystems and plays an important role in the global carbon dioxide cycle through the process of photosynthesis.&#160;The impact of ocean hydrodynamic conditions on the biological activity of plankton species has been a subject attracting the interest of researchers during several decades.&#160;In the present study, we perform a well-resolved direct numerical simulation of a turbulent flow around an island, coupled to a predator&#8211;prey model of planktonic population dynamics, with the aim of investigating the conditions under which an algal bloom is observed.&#160;&#160;The impact on the plankton dynamics of the turbulent regime as well as of the island shape is studied, through the investigation of spectra of velocity and plankton population density. Moreover, we focus on the correlation between the flow structures and the plankton patchiness, particularly by analyzing the effect of the sub-grid&#160;scale dynamics. The main outcome is that the response and the spatial distribution of plankton depend crucially on the relation between the time scale associated to the flow and the time related to biological growth, while they are fairly independent on the geometrical details of the obstacle.&#160;Lire moins >

Langue :

Anglais

Comité de lecture :

Oui

Audience :

Internationale

Vulgarisation :

Non

Collections :

Unité de Mécanique de Lille (UML) - ULR 7512

Source :

Harvested from HAL

Fichiers

2105.05647
Accès libre
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