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Article Dans Une Revue Ocean Science Discussions Année : 2006

Mechanisms controlling primary and new production in a global ecosystem model ? Part II: the role of the upper ocean short-term periodic and episodic mixing events

Résumé

The use of 6 h, daily, weekly and monthly atmospheric forcing resulted in dramatically different predictions of plankton productivity in a global 3-D coupled physical-biogeochemical model.

Resolving the diurnal cycle of atmospheric variability by use of 6 h forcing, and hence also diurnal variability in UML depth, produced the largest difference, reducing predicted global primary and new production by 25% and 10% respectively relative to that predicted with daily and weekly forcing. This decrease varied regionally, being a 30% reduction in equatorial areas and 25% at moderate and high latitudes. A 10% increase in the primary production was seen in the peripheries of the oligotrophic gyres.

By resolving the diurnal cycle, model performance was significantly improved with respect to several common problems: underestimated primary production in the oligotrophic gyres; overestimated primary production in the Southern Ocean; overestimated magnitude of the spring bloom in the subarctic Pacific Ocean, and overestimated primary production in equatorial areas. The result of using 6 h forcing on predicted ecosystem dynamics was profound, the effects persisting far beyond the hourly timescale, and having major consequences for predicted global and new production on an annual basis.
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hal-00298406 , version 1 (18-06-2008)

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  • HAL Id : hal-00298406 , version 1

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E. E. Popova, A. C. Coward, G. A. Nurser, B. de Cuevas, T. R. Anderson. Mechanisms controlling primary and new production in a global ecosystem model ? Part II: the role of the upper ocean short-term periodic and episodic mixing events. Ocean Science Discussions, 2006, 3 (4), pp.1115-1148. ⟨hal-00298406⟩

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