Abstract
Recently Wilson and Flesch (Boundary-Layer Meteorology, 84, 411-426, 1997) suggested that the average increment 〈dθ z〉 to the orientation θ = arctan(w‘/u‘) of the Lagrangian velocity-fluctuation vector can be used to distinguish the better Lagrangian stochastic models within the well-mixed class. Here it is demonstrated that the specification of 〈dθ z〉 constitutes neither a sufficient or universally applicable criterion to distinguish the better Lagrangian stochastic models within the well-mixed class. The hypothesis made by Wilson and Flesch that Lagrangian stochastic models with φ/PE irrotational are ‘zero-spin’ models, having 〈dθ z〉=0, is proven
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