Suppressing and enhancing effects of mesoscale dynamics on biological production in the Mozambique Channel.

Jose, Yonss S. , Penven, P., Aumont, O., Machu, E., Moloney, C.L., Shillington, F. and Maury, O. (2016) Suppressing and enhancing effects of mesoscale dynamics on biological production in the Mozambique Channel. Journal of Marine Systems, 158 . pp. 129-139. DOI 10.1016/j.jmarsys.2016.02.003.

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Abstract

We used a coupled physical–biogeochemical model to investigate how the strong eddy activity typical of the Mozambique Channel affects biological production. A numerical experiment was carried out, in which mesoscale dynamics were suppressed by cancelling the nonlinear terms for horizontal momentum in the Naviers–Stokes equation.

Mesoscale dynamics were found to be responsible for (1) increased offshore production in the Mozambique Channel as a result of net eddy-induced offshore transport of nutrient-rich coastal waters; (2) decreased shelf production along the central Mozambican and south-west Madagascar coast caused by a reduction in nutrient availability related to the net eddy-induced lateral transport of nutrients; (3) increased coastal production along the northern Mozambican coast caused by eddy-induced nutrient supply.

The model results also showed an intensification and shallowing of the subsurface production, related to increased upper layer nutrient concentrations caused by eddy activity.

In addition, by driving the detachment of the East Madagascar Current at the southern tip of the island, inertial processes intensify the southern Madagascar upwelling and causes offshore diffusion of the upwelled waters.

These results emphasize the complex role played by eddy activity and, more generally, inertial processes on marine ecosystems in this region.

Document Type: Article
Keywords: Mesoscale dynamics; Chlorophyll; Primary production; Mozambique Channel
Research affiliation: OceanRep > GEOMAR > FB2 Marine Biogeochemistry > FB2-BM Biogeochemical Modeling
Refereed: Yes
Open Access Journal?: No
DOI etc.: 10.1016/j.jmarsys.2016.02.003
ISSN: 0924-7963
Date Deposited: 12 May 2016 08:45
Last Modified: 01 Feb 2019 15:14
URI: http://oceanrep.geomar.de/id/eprint/32836

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