Objective criteria for discrimination of irrotational and rotational motions in the atmosphere |
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| Authors: | F Di Benedetto |
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| Institution: | (1) Institute of Physics, University of Aquila, Aquila, Italy;(2) Present address: European Space Research Organization (ESRO), 34, Rue La Pérouse, Paris 16e, France |
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| Abstract: | Summary Objective criteria are obtained for irrotational frictionless flow in the case of pure geostrophic, isallobaric and thermal wind flow. For rotational flow, a criterion is obtained in the case of non-permanent barotropic conditions, by introducing the concept ofabsolute potential vorticity. These criteria permit practical discrimination of conditions related to rotational or irrotational motion in the atmosphere, in an objective way. |
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