Institut für Meteorologie und Geophysik

Universität Wienseit 1851

4D OMEGA FORM1

4D-Objective MEsoGamma Analyses of FOehn in the Rhine

Valley during MAP

Simon Tschannett, Barbara Chimani & Reinhold Steinacker

1 funded by the Austrian Science Fund FWF Project Nr.: P17332-N13

Bad Ragaz Nov. 2004 FORM-Meeting

• Project Ideas

• Data

• Analysis Tool

• First results

Content

Quelle: www.wolkenatlas.de

Bad Ragaz Nov. 2004 FORM-Meeting

Project Ideas• Development of 3D - 4D analysis system

(with focus on Foehn in the Rhine Valley)

– Wind-pressure field interaction– Cross Validation

• Comparison of foehn in the Rhine Valley and Wipp Valley

• Model Comparison (MM5, MesoNH, MC2)– Intercomparison (on a common grid)

– Model - Analysis

• Development of Nowcasting tool

Bad Ragaz Nov. 2004 FORM-Meeting

Data

• Surface stations• Radiosondes• Lidar• Radar• Sodar• Windprofiler• Aircrafts (MAP, AMDARs)

• Dropsondes• Constant Level Balloons

From MAP-Data-Center, with friendly support by Esther Häller

Special Project at ECMWF

Bad Ragaz Nov. 2004 FORM-Meeting

Analysis Tool

• New analysis method similar to VERA Variational analysis + fingerprints (dynamic downscaling)

– Development of new data-quality-control (Bayesian)– Considering of anisotropy in data distribution and in

nature in space and time

• Calculates on a regular grid • Necessary because of higher dimensions• Using cascading system and nesting

VERAXX

Bad Ragaz Nov. 2004 FORM-Meeting

Bad Ragaz Nov. 2004 FORM-Meeting

First ResultsVERAXX

VERA

2D

Bad Ragaz Nov. 2004 FORM-Meeting

Vertical Temperature Cross-SectionHorizontal Temperature Cross-Section

S N

Air Temperature 15.11.2002 18UTC

3D

Bad Ragaz Nov. 2004 FORM-Meeting

Dissertations• Multidimensional analyses taking non-

conventional data sources into account (Barbara Chimani)

– Cross-Validation of analyses– Comparison of different data types

• Multidimensional analyses for Föhn dynamics research in the Rhine Valley (Simon Tschannett)

– Intercomparison of wind and pressure fields– Model comparison (mod-mod; mod-ana)

Bad Ragaz Nov. 2004 FORM-Meeting

Next steps

• Implementing of 4D and testing of the method with analytical data

• Data collection• Testing the analysis technique with real

data• Implementing fingerprints and

comprehensive data qualitiy control

• any questions?