 |
| Titel |
IL-GLOBO (1.0) – integrated Lagrangian particle model and Eulerian general circulation model GLOBO: development of the vertical diffusion module |
| VerfasserIn |
D. Rossi, A. Maurizi |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1991-959X
|
| Digitales Dokument |
URL |
| Erschienen |
In: Geoscientific Model Development ; 7, no. 5 ; Nr. 7, no. 5 (2014-09-30), S.2181-2191 |
| Datensatznummer |
250115728
|
| Publikation (Nr.) |
 copernicus.org/gmd-7-2181-2014.pdf |
|
|
|
|
|
| Zusammenfassung |
| The development and validation of the vertical diffusion module of IL-GLOBO,
a Lagrangian transport model coupled online with the Eulerian general circulation model GLOBO, is described. The module simulates the effects of
turbulence on particle motion by means of a Lagrangian stochastic model (LSM)
consistently with the turbulent diffusion equation used in GLOBO. The
implemented LSM integrates particle trajectories, using the native
σ-hybrid coordinates of the Eulerian component, and fulfils the well-mixed condition (WMC) in the general case of a variable density profile. The
module is validated through a series of 1-D offline numerical experiments by
assessing its accuracy in maintaining an initially well-mixed distribution in
the vertical. A dynamical time-step selection algorithm with constraints
related to the shape of the diffusion coefficient profile is developed and
discussed. Finally, the skills of a linear interpolation and a modified
Akima spline interpolation method are compared, showing that both satisfy the
WMC with significant differences in computational time. A preliminary run of
the fully integrated 3-D model confirms the result only for the Akima
interpolation scheme while the linear interpolation does not satisfy the WMC
with a reasonable choice of the minimum integration time step. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|