ROMS-JEDI Implementation

ROMS-JEDI Implementation

Most modern geophysical models can be connected to the JEDI framework, provided that the following predefined abstract C++/Fortran classes or building blocks are coded:

CLASS	Description
ErrorCovarinace	Background error covariance, training, and modeling (SABER: BUMP/NICAS)
Field/Fields	Elemental operators to manipulate a field or a set of fields to the model state/increment vector and metadata
Geometry	Application grid definition, including coordinates, metrics, parallel decomposition, and operators
GeometryIterator	Methods to set/get state fields over specified grid points in LETKF applications
Increment	Procedures to operate on the increment vector that extends/inherits from the Fields class
LinearModel	Initializes, run, and finalizes Tangent Linear and Adjoint model dynamical/numerical kernels
LinearVariableChange	Tangent/adjoint increment vector variables transformation from one field to another
Localization	Model Ensemble Localization (SABER: BUMP/NICAS)
Model	Initializes, run, and finalizes the Nonlinear model dynamical/numerical kernel
State	Procedures to operate on the state vector that extends/inherits from the Fields class
Trajectory	Methods to process the Nonlinear trajectory that linearizes the tangent linear and adjoint models
VariableChange	Nonlinear state vector variables transformation from one field to another

Code Design

Below is a diagram showing the interoperability mechanism for the Geometry Class that allows Fortran to invoke C++ function and vice versa for C++ to invoke Fortran procedures.