Influence of mesoscale eddies on biological production in the Mozambique Channel: Several contrasted examples from a coupled ocean-biogeochemistry model

Type Article
Date 2014-02
Language English
Author(s) Jose Yonss, Aumont Olivier2, Machu Eric2, 4, Penven Pierrick4, Moloney C. L.3, Maury Olivier1, 4
Affiliation(s) 1 : Univ Cape Town, Marine Res Inst, Dept Oceanog, ZA-7700 Rondebosch, South Africa.
2 : LMI ICEMASA, UBO, IRD, Lab Phys Oceans,CNRS,UMR 6523,Ifremer, Paris, France.
3 : Univ Cape Town, Marine Res Inst, Dept Zool, ZA-7700 Rondebosch, South Africa.
4 : Inst Rech Dev, UMR EME 212, Paris, France.
Source Deep-sea Research Part Ii-topical Studies In Oceanography (0967-0645) (Pergamon-elsevier Science Ltd), 2014-02 , Vol. 100 , P. 79-93
DOI 10.1016/j.dsr2.2013.10.018
WOS© Times Cited 28
Keyword(s) Ocean physical-biogeochemical coupling, Cyclonic and anticyclonic eddies, Chlorophyll, Nutrients, Mozambique Channel
Abstract The impact of mesoscale activity on phytoplankton and nutrient distribution in the Mozambique Channel was simulated by coupling a biogeochemical model (PISCES) with a regional oceanic model (ROMS). Examples of the effects of eddies on the biogeochemistry of the Mozambique Channel are presented to illustrate the complexity of the system. In the model, several cyclonic eddies were found with low concentrations of chlorophyll at their cores, which contrasts with previous studies in the open ocean. In addition, several anticyclonic eddies were simulated with high concentrations of chlorophyll at their cores. Phytoplankton growth within these mesoscale features (both cyclonic and anticyclonic eddies) occurred in response to nutrient injection into the euphotic zone by advection, and subsequent retention of surrounding nutrient-rich waters within eddies. Offshore nutrient distributions depended strongly on lateral advection of nutrient-rich water from the coastal regions, induced by eddy interaction with the shelf. The environmental conditions at the locations where eddies were generated had an important effect on nutrient concentrations within these structures.
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Jose Yonss, Aumont Olivier, Machu Eric, Penven Pierrick, Moloney C. L., Maury Olivier (2014). Influence of mesoscale eddies on biological production in the Mozambique Channel: Several contrasted examples from a coupled ocean-biogeochemistry model. Deep-sea Research Part Ii-topical Studies In Oceanography, 100, 79-93. Publisher's official version : https://doi.org/10.1016/j.dsr2.2013.10.018 , Open Access version : https://archimer.ifremer.fr/doc/00162/27320/