On the simulation of convective structures
Creators
- 1. GKSS-Forschungszentrum Geesthacht G.m.b.H., Geesthacht-Tesperhude (Germany, F.R.). Inst. fuer Physik
Description
A parameterization scheme for the simulation of convective clouds is presented. Convection is described by a diagnostic equation providing a height dependent convective velocity inside the cloud. The updraft is started by taking a vertical velocity at cloud base proportional to Deardorff's convective velocity scale. Estimates from Bruemmer et al. (1986) suggest a value of one tenth for the proportionality factor. In addition to conserving rainwater within the solution domain we consider precipitation reaching the ground. For numerical testing the cloud parameterization scheme is incorporated into a three-dimensional hydrostatic mesoscale model (Beniston, 1984). Data from KonTur experiment show qualitative agreement between calculated and observed rainfall rates. (orig.)
Availability note (English)
MF available from INIS under the Report Number.Abstract (German)
Eine Parameterisierung zur Simulation konvektiver Wolken wird vorgestellt. Die Konvektion wird durch eine diagnostische Gleichung fuer die hoehenabhaengige Vertikalgeschwindigkeit in der Wolke beschrieben. Es wird angenommen, dass die Vertikalgeschwindigkeit an der Wolkenbasis proportional zu Deardorffs konvektiver Geschwindigkeitsskala ist. Schaetzungen von Bruemmer et al. (1986) legen einen Proportionalitaetsfaktor von einem Zehntel nahe. Regenfallraten werden bestimmt durch geeignet gewaehlte Randbedingungen fuer das Regenwasser. Das Wolkenschema wird in einem dreidimensionalen hydrostatischen Mesoskala-Modell implementiert (Beniston, 1984). Der fuer einen Datensatz aus dem KonTur-Experiment berechnete Regenfall stimmt qualitativ mit den Beobachtungen ueberein. (orig.)
Files
Restricted
The record is publicly accessible, but files are restricted to users with access.
Additional details
Publishing Information
- Imprint Pagination
- 32 p.
- Report number
- GKSS--86/E/35
INIS
- Country of Publication
- Germany
- Country of Input or Organization
- Germany
- INIS RN
- 18018077
- Subject category
- S58: GEOSCIENCES;
- Descriptors DEI
- CLOUDS; CONVECTION; FORECASTING; MATHEMATICAL MODELS; MESOSPHERE; MULTI-PARAMETER ANALYSIS; RAIN; SCALE MODELS; SIMULATION; THREE-DIMENSIONAL CALCULATIONS; VELOCITY; WEATHER
- Descriptors DEC
- ATMOSPHERIC PRECIPITATIONS; EARTH ATMOSPHERE; ENERGY TRANSFER; HEAT TRANSFER; STRUCTURAL MODELS
Optional Information
- Notes
- With 13 figs.