Diagnosis of mesoscale structures in cases of lee cyclogenesis during ALPEX |
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| Authors: | D Gomis A Buzzi S Alonso |
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| Institution: | (1) Present address: Group of Geophysical Fluid Dynamics, Departament de Física, Universitat de les Illes Balears, E-07071 Palma de Mallorca, Spain;(2) Present address: FISBAT-CNR, Dipartimento di Fisica, Via Irnerio, 46, I-40126 Bologna, Italy |
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| Abstract: | Summary Several cases of lee cyclogenesis that occurred during ALPEX-SOP have been analyzed, with the aim of separating the large scale structures from the subsynoptic/meso-a scale features that are characteristic of this meteorological phenomenon. The results presented here are mainly based on composites of the analyzed cases. We assume that the deformation caused by the orography can be, at least to a reasonable extent, isolated from the  undisturbed state using scale separation. The analysis technique we employ provides the scale separation as built-in in the interpolation algorithm. The scale separation error due to the large inhomogeneities of the data density distribution is partly corrected using a method described in the text. The orographic disturbance appears in different mesoscale fields as a quasiantisymmetric dipolar structure. For example, high/low pressure, cold/warm temperature and anticyclonic/cyclonic couplets characterize the mesoscale fields near the Alps. A qualitative agreement is found with the structure of the orographically induced perturbations predicted by the normal mode theory of lee cyclogenesis.With 7 Figures |
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