document - Cosmo

Contents i
Table of Contents
Editorial 1
1 Working Group on Data Assimilation 3
Tomographic Determination of the Spatial Distribution of Water Vapor Using GPS
Observations
M. Troller, A. Geiger, E. Brockmann, J.-M. Bettems, B. Bürki, H.-G. Kahle 3
Improved Methods for Snow-Cloud Separation Using Multi-temporal Meteosat-8
SEVIRI Imagery
M. de Ruyter de Wildt . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Sensitivity of the LHN Scheme to Non-Rain Echoes
D. Leuenberger, A. Rossa . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Revised Latent Heat Nudging to cope with Prognostic Precipitation
C. Schraff, K. Stephan, S. Klink . . . . . . . . . . . . . . . . . . . . . . . . . 31
Revised Quality Control for Radiosonde Humidity
C. Schraff . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
2 Working Group on Numerical Aspects 44
Implementation of the 3D-Turbulence Metric Terms in LMK
M. Baldauf . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
Courant Number Independent Advection of the Moisture Quantities for the LMK
J. Förstner, M. Baldauf, A. Seifert . . . . . . . . . . . . . . . . . . . . . . . . 51
Sensitivity Experiments with the Runge-Kutta Time Integration Scheme
L. Torrisi . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
Application of the Z-Coordinate Version vs. the Terrain Following Version of LM
Nonhydrostatic Model over Greece
E. Avgoustoglou, T. Tzeferi, V. Tirli, I. Papageorgiou . . . . . . . . . . . . . 74
3 Working Group on Physical Aspects 81
Preliminary Results on Comparison of LM Radiation Code to the LBL model RTX
A. Bozzo . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83
Implementation of the Statistical Cloud Scheme Option: Preliminary Tests
E. Avgoustoglou, T. Tzeferi, I. Papageorgiou . . . . . . . . . . . . . . . . . . 88
Validation of Boundary Layer Clouds: Test Results with the Minimum Vertical
Diffusion Coefficient set equal to Zero in LM
E. Heise . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94
Improved Diagnosis of Convective and Turbulent Gusts: Test Results of new Gust
Parameterizations
E. Heise . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 103
A Three-Category Ice Scheme for LMK
T. Reinhardt, A. Seifert . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 115
Simulation Studies of Shallow Convection with the Convection-Resolving Version
of DWD Lokal-Modell
F. Theunert, A. Seifert . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 121
COSMO Newsletter No. 6