Conclusions and Outlook

Using data sets from the ECHAM5 model and the ERA-40 reanalysis we analyzed atmospheric parameters accessible to RO measurements with focus on the UTLS region. We presented the investigation of these large climate data fields using a novel visualization method. The interactive visual field exploration tool SimVis enables the exploration of the whole data set at once and interesting features can be interactively selected by the user.

The utility of this method was demonstrated on the basis of the localization of trends with high SNR in space and in time. Temperature and refractivity from the ECHAM5 model run show robust and sensitive trends in the lower stratosphere region over the whole investigated time period, with considerable contributions from the upper troposphere. Deficiencies in the ERA-40 reanalysis, analyzed in geopo-tential height and temperature, at southern high latitudes and in early years of the pre-satellite era could be detected. Regions of high SNR reside in the lower stratosphere at northern high latitudes and in the tropical lower troposphere. Ongoing work focuses on the application of the findings to RO observations, the intercom-parison of multiple climate model fields, and detailed classical statistical analysis in domains of interest.

Acknowledgements We acknowledge the IPCC climate modeling groups for providing their data for analysis, the Program for Climate Model Diagnosis and Intercomparison (PCMDI) for collecting and archiving the model output, and the JSC/CLIVAR Working Group on Coupled Modelling (WGCM) for organizing the model data analysis activity. The multi-model data archive is supported by the Office of Science, U.S. Department of Energy. This work was funded by the Austrian Science Fund (FWF) Project INDICATE P18733-N10.

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