Jessen, Thies (2006) Tropische Wirbelstürme im ECHAM5-Modell. (Diploma thesis), Christian-Albrechts-Universität zu Kiel, Kiel, Germany, 83 pp.

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Abstract

In this study is the representation of tropical storms in the general circulation model ECHAM5 was investigated. An established automatic search algorithm was used to scan an ensemble of five different model runs covering 130 years between 1870 and 2000. Although the ECHAM5 model shows good capabilities to represent storm tracks, the global distribution and structure compared to observed ones, the ECHAM5 model generally underestimates the total number of tropical stormes. Therefore tropical storm relevant parameters such as wind velocity, vorticity and vertical shear of the ECHAM5 dataset and the NCEP /NCAR-Reanalysis-1 dataset were compared. Except for 'easterly waves' in the North Atlantic, no major differences between both datasets coulde be found to explain the small number of tropical storms in ECHAM5.

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