ИСТИНА

These results were published in the Russian Meteorology and Hydrology Journal (2004, N9, and 2005, N12). They may seem interesting, especially the possibility of hurricanes diagnosis based on statistical properties of vorticity anomalies. I have not met such an approach, so let me revive an old research results. Vertical component of vorticity at 850 hPa calculating based on the NCEP/NCAR (31-year, 1970-2000 years) reanalysis data (2.5х2.50), was used to characterize the tropical cyclones. The PDF of vorticity (F), calculated at each grid points, has a unimodal form. The maximum of the curve is located near the zero (F =0) and a long tail extends to positive F. Comparison of amount of different F anomalies and actual number of hurricanes during studied period has shown that the situation when the vorticity anomalies more than four standard deviations (σ) is a convenient indicator to diagnose the presence of hurricane. Geographical localization of the grid points consisting of large vorticity outlets coincide to well-known regions of tropical cyclone activity. Over the Pacific, the interannual variability of amount of anomalies F>4σ correlates with the El Nino/La Nina dynamics diagnosing by Nino3 temperature variations. Composite scheme of hurricane corresponding to vorticity anomaly (F>4σ) has been developed. It includes the dependence of tangential component of the wind velocity on relative distance from the vortex center. Analysis of vorticity equation allows conclude that for the composite scheme (F>4σ) the main roles belong to vorticity advection, divergence term and terms, corresponding to the heat influx.