STUDY OF THE INFLUENCE OF THE STRUCTURE OF AN INITIALIZED VORTEX ON THE FORECAST OF TROPICAL CYCLONE MOTION WITH THE ETA MODEL

A. E. Pokhil and M. Yu. Zaichenko

A high-resolution regional atmospheric model (ETA model) is used to study the behavior of tropical cyclones (TCs) in the northwestern Pacific. The wind speed distribution in real TCs reconstructed from data of international centers is studied. It is shown that wind profiles in different stages of real TCs are very different. Comparison is made of real and analytical wind distributions depending on the distance from the vortex center. It is shown that different TCs require different initializations of a pseudo-vortex. Numerical experiments with real TCs with initialization and without it have shown that the proposed mechanism of pseudo-vortex initialization with satellite data significantly reduces the error in the initial TC location: the wind and pressure fields in these cases more correctly reflect the real ones than analogous fields without vortex initialization.

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