PISCES (acronym for "Pelagic
Iteraction Scheme for Carbon and Ecosystem
Studies") is an ecosystem and carbon-cycle model developed
first by Olivier AUMONT at the Laboratoire d’Océanographie
DYnamique et de Climatologie (LODYC). It is now developed and used in several
other labs (see users section). In its current state, this model is
mostly a Fasham-like model, with fixed O2/C/N/P ratios. It includes
only one global set of parameters and is intended to be able to be used
both for global, regional and local studies.
Prognostic variables are the
three dimensional tracer concentrations. They
are distributed on a three-dimensional Arakawa-C-type grid using
prescribed z- or s-levels. The model is based on 24 prognostic
variables which describe the carbon, nitrogen, silicon, and iron
cycles. PISCES does not include up-to-now any superficial sediment
model (even if it is planned for pretty soon). Furthermore, the model
is not modular: All variables are always activated. The user cannot
decide what cycles he wants to describe, how many phytoplankton or
zooplankton size-classes he wants to model ...
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| PISCES is currently interfaced with the OPA model, an Ocean General
Circulation Model also developed at LODYC. The coupling and dependancy of the
biogeochemical model to the OGCM is tight, which means that the code
design has been up-to-now constrained to be compatible with the
dynamical model. However, beta-version of PISCES coupled to the
regional ocean model ROMS
PISCES can be run on many
different computers, including shared and distributed memory
multi-processor computers (Cray C98, T3D, T3E, Origin 2000, NEC SX4
and SX5, VPP, ...). However, multi-processor computers are not
supported yet. More
information on the model design, the tracer transport model it is
coupled to, its numerics can be found in the OPA 8.1 tracer
transport model reference manual [Foujols et al. 2000] |  |
