Peter Hjort Lauritzen

AS Atmospheric Sciences

The 2007 Young Scientist Outstanding Poster Paper (YSOPP) Award is awarded to Peter Hjort Lauritzen for the poster/PICO entitled:

A Stability Analysis of Finite-Volume Advection Schemes Permitting Long Time Steps (Lauritzen, P.)

Click here to download the poster/PICO file.

Peter is an ASP (Advanced Study Program) postdoc at the National Center for Atmospheric Research in Boulder, Colorado. He got his PhD from the University of Copenhagen where he, in collaboration with the Danish Meteorological Institute, derived and implemented a new dynamics module for HIRLAM that exactly conserved mass of air and tracers.

He is particularly interested in numerical methods for dynamical cores, that is (roughly speaking), algorithms that approximate the solution to the adiabatic frictionless equations of motion for the atmosphere on resolved scales. The present poster is about a fundamental part of the dynamical core: advection. It presents the damping and dispersion properties of several widely used advection schemes; among them the so-called Lin & Rood scheme that is used in several European and American general circulation models. It was demonstrated both theoretically and with a conceptual analysis that the scheme is sensitive to the choice of inner and outer operators applied in the scheme that can lead to increased numerical damping for large Courant numbers.