Abstract
Considering that many atmospheric phenomena can well be regarded to be nearly two-dimensional, the author theoretically deals with the two-dimensionally isotropic turbulent field. The structure of the field is investigated in close connection with that of the three-dimensionally isotropic turbulent field. Taylor-Kármán's correlation coefficient for the former is found to be approximately the same with that for the latter in their numerical values, though their functional forms are considerably different from each other. The calculated numerical values of the coffiicient agree well with those actually observed in the atmosphere.
