## Hamiltonian-based numerical methods for forced-dissipative climate prediction

### Organization:

Funded by: NWO

PhD: Bob Peeters

Supervisor: Onno Bokhove

Collaboration: Jason Frank (CWI, UvA)

### Description:

In this project we assess the behavior of (idealized) climate models which have a Hamiltonian discretization in the limit of no forcing and dissipation. We believe that such type of discretizations lead to better climate predictions. This objective is investigated in two ways:

1. |
Difference in performance between Hamiltonian and conventional non-Hamiltonian based numerical discretizations for simplified low-order models. |

2. |
Construction of a hydrostatic stratified model on the sphere based on a symplectic Hamiltonian particle-mesh method (HPM) and finite-element method (FEM). |

*Adiabatic ﬂow becomes two-dimensional when expressed in isentropic coordinates. This simplifies the Hamiltonian description and discretization of the hydrostatic flow (away from the boundaries, where isentropes may intersect).*

*Particle trajectories under small-amplitude wave flow in a static atmosphere, shown for three different isentropic (S) levels. Dots are computed particle vertical (Z) positions from the HPM-FEM code: HPM in horizontal direction, FEM in entropic direction.*

### Publications:

### Papers:

### Conference items:

2nd meeting of Wave-flow Interactions, a network in mathematics, Edinburgh 25-29 May 2009,presentation

### Posters:

EGU General Assembly Vienna, 2007, Hamiltonian-based numerical methods for forced-dissipative climate prediction