Coupled 3D physical and biological modelling of the mesoscale variability observed in North-East Atlantic in spring 1997: biological processes

A limited area, eddy resolving coupled physical and biological model and data assimilation are used to reproduce and analyse the ecosystem variability observed in the North-East Atlantic in April–May 1997 on Discovery cruise 227. The ecosystem was in a post-bloom grazing controlled regime. The combi...

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Bibliographic Details
Published in:Deep-sea research. Part I, Oceanographic research papers Oceanographic research papers, 2002-10, Vol.49 (10), p.1741-1768
Main Authors: Popova, E.E, Lozano, C.J, Srokosz, M.A, Fasham, M.J.R, Haley, P.J, Robinson, A.R
Format: Article
Language:English
Subjects:
Computer based modeling
Data assimilation
Earth, ocean, space
Ecosystems
Exact sciences and technology
External geophysics
Mesoscale processes
Modelling
Oceanography
Physical and chemical properties of sea water
Physics of the oceans
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Summary:A limited area, eddy resolving coupled physical and biological model and data assimilation are used to reproduce and analyse the ecosystem variability observed in the North-East Atlantic in April–May 1997 on Discovery cruise 227. The ecosystem was in a post-bloom grazing controlled regime. The combination of the deep mixing in the upper layer during the cruise and a deeper than average winter convection led to high-nutrient–low-chlorophyll type conditions, which are unusual for this location. These conditions and lack of strong mesoscale physical features led to low spatial variability of phyto- and zooplankton yet strong sensitivity to the variations in the vertical mixing (storm event). Modelling results show that plankton patchiness formation under these conditions was dominated by biological mechanisms (mainly predator–prey oscillations). Furthermore, this mechanism, together with mixing and stirring, are responsible in this order for the observed scales and variability of patchiness from homogeneous low winter concentrations of phyto- and zooplankton.
ISSN:0967-0637
1879-0119
DOI:10.1016/S0967-0637(02)00091-2