Article

 

Analysis and comparison of three ecosystem models Public Deposited

Downloadable Content

Download PDF
https://ir.library.oregonstate.edu/concern/articles/0g354m08k

Descriptions

Attribute NameValues
Creator
Abstract
  • Three-component (NPZ), four-component (NPZD), and five-component (NNPZD) nitrogen-based ecosystem models are compared. The fixed points of the zerodimensional systems, with no spatial variation except light attenuation by water, are determined. A linear-stability analysis shows that unstable steady solutions exist for all three models. Time-periodic solutions are found in these regions. It is shown that the choice of the values of the parameters in the zooplankton equation is critical in determining steady state concentrations. One-dimensional model studies allowing variation with depth, self-shading by phytoplankton, and vertical diffusion show that the differences among the models increase when the available light is influenced by the presence of phytoplankton. With vertical diffusion, periodic solutions, such as those in the zero-dimensional case, are not found. Finally, a set of one-dimensional depthintegrated models, with variability in time and across-shore coordinate, are formulated. These models include horizontal advection and diffusion and the sinking of detritus (or phytoplankton). Application of a constant offshore advection velocity and coastal boundary conditions consistent with upwelling, produces many of the features seen in two-dimensional experiments [Spitz et al., 2003]. The dependence of the resulting spatial distributions of phytoplankton and zooplankton on the values of the biological parameters is determined, helping to explain the two-dimensional results. Significant differences are found between the NPZ and the other models as a result of the sinking of phytoplankton rather than detritus.
Resource Type
DOI
Date Available
Date Issued
Citation
  • Newberger, P. A., J. S. Allen, and Y. H. Spitz, Analysis and comparison of three ecosystem models, J. Geophys. Res., 108(C3), 3061, doi:10.1029/2001JC001182, 2003.
Journal Title
Journal Volume
  • 108
Journal Issue/Number
  • C3
Academic Affiliation
Rights Statement
Funding Statement (additional comments about funding)
  • This research was supported by the National Science Foundation Coastal Ocean Processes (CoOP) Program under grants OCE-9711481 and OCE-9907854 and by the Office of Naval Research Coastal Dynamics Program under grant N00014-02-1-0100.
Publisher
Peer Reviewed
Language
Replaces
ISSN
  • 0148-0227

Relationships

Parents:

This work has no parents.

Items