 |
| Titel |
Comparing ED(MF)n in the gray zone to observations |
| VerfasserIn |
Maren Brast, Vera Schemann, Christopher Moseley, Susanne Crewell, Roel Neggers |
| Konferenz |
EGU General Assembly 2017
|
| Medientyp |
Artikel
|
| Sprache |
en
|
| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 19 (2017) |
| Datensatznummer |
250148211
|
| Publikation (Nr.) |
 EGU/EGU2017-12447.pdf |
|
|
|
|
|
| Zusammenfassung |
| A new scale-adaptive shallow cumulus parameterization scheme is confronted with
measurements made during the High Definition Clouds and Precipitation for advancing
Climate Prediction Observational Prototype Experiment (HOPE) at the Jülich Observatory
for Cloud Evolution (JOYCE). The Eddy-Diffusivity Multiple Mass-Flux (or ED(MF)n)
scheme is a bin-macrophysics scheme, in which subgrid transport and clouds are formulated
in terms of discretized size densities. It is implemented into a large-eddy simulation (LES)
model, replacing the original subgrid transport scheme. This way the ED(MF)n can be tested
in an idealized setting, covering the boundary layer gray zone. The LES is driven with
large-scale forcings derived from analyses of the weather prediction model COSMO-DE,
resulting in a reasonably accurate simulation of the measured conditions. During the HOPE
campaign the boundary layer was measured extensively, supplying a wealth of
data that can be used to evaluate parameterizations. Both long-term averages and
individual shallow cumulus days are investigated. The LES is run with and without
ED(MF)n for various resolutions, and the modeled boundary layer is compared to
the observations from HOPE. This allows investigating the question how well the
scale-adaptive scheme reproduces simulated and observed meteorology across the gray zone. |
|
|
|
|
|
|