On one possibility of studying the cyclonic regime

The dynamics of some characteristics of a cyclonic situation (cyclonic regime) of the northwestern Pacific cyclonic zone is studied. The characteristics that are considered are the density of cyclonic energy at a point (intensity) and the power over a given area. In the model, the intensity at a point is defined as the sum of all intensities of preceding cyclones, with consideration for their spatial and temporal separation from the given point. Power for a given moment and a given area is defined as the sum of intensities over this area. Cyclonically active seasons are considered. The dynamics of the power was estimated for areas of different size. It is shown that the point values of cyclonic intensity, at the times of their maximum, are statistically related to one another by a negative power-law dependence. Periodicity is observed in the time evolution of the power in different areas.     

Intra-annual dynamics of seismic activity in the cyclonic zone of the northwestern part of the Pacific Ocean

Doklady Earth Sciences -     

Unique properties of humic substances from sapropel

Doklady Earth Sciences - Sapropel from inland Russian water reservoirs is becoming a popular raw material for medicinal purposes, production of sorbents, organomineral fertilizers, and food...     

Tropical cyclones as a possible factor affecting seismic activity in the cyclonic zone of the northwestern Pacific

A possible influence of tropical cyclones on seismic activity in the cyclonic zone of the northwestern Pacific is considered. There is no direct and sufficiently reliable method for calculating the degree of impact of tropical cyclones on the Earth’s crust. Therefore, a sort of inverse problem is solved in the investigation: a possible qualitative influence of tropical cyclones on seismic activity is estimated from its intra-annual dynamics. It is established that for territories of the cyclonic zone, the intra-annual dynamics of cyclonic and seismic activities are similar. Low monthly mean values of the cyclonic and seismic energies are attained in July–October, whereas in the continental territories under consideration (Central Asia), the seismic activity is higher in January–March. The results obtained suggest that cyclones can affect the seismic regime in the cyclonic zone of the northwestern Pacific.     

Diagnosis of the interaction of tropical cyclones

At present the mutual influence of tropical cyclones (TCs) has been investigated to a much lesser extent than the cyclones themselves. Most frequently, such investigations are restricted to the study of the influence of the interaction of two TCs on their motion. However, actually, the mutual influence of TCs is much more diverse. For example, each cyclone alters the state of the medium (in particular, decreases the heat store of the upper ocean layer), i.e., affects the subsequent cyclones. Under conditions of a limited energy resource of the medium, cyclones, existing simultaneously, “compete,” to a degree, with each other. These and other similar circumstances have made it practical to consider tropical cyclones and the environment as interdependent elements of a complex open system. This study considers two versions of nonlinear models describing the interaction of TCs with the upper ocean layer and with one another similarly to a number of well-known and verified models of synergetics (interaction of populations, dynamics of optical quantum generators). It is shown that the models reproduce some very important qualitative features of the evolution of TC intensity.     

Estimates for regression relationships between characteristics of tropical cyclones and gravity anomalies

We have obtained regression relationships between vertical components of gravity anomalies in tropical cyclone areas and some cyclonic characteristics. These regressions are more pronounced in territories where negative gravity anomalies are prevalent. Numerical experiments are performed for the cyclonic zone of the northwestern Pacific and western Atlantic. In the zone of the western Atlantic, the main focus is on cyclones entering to the terrestrial part of the United States. We conclude that under some conditions, gravity anomalies can affect the characteristics of tropical cyclones.     

Some interrelations between the stages of development of tropical cyclones

Energy interdependence between groups of tropical cyclones separated by time intervals of cyclonic “calm” is investigated. A linear negative interrelation between the total powers of such groups is revealed. The groups consist of real tropical cyclones that occurred within the active cyclonic zone in the northwestern Pacific. The corresponding regression relationships are obtained. Interrelation between the stages of development of seasonal cyclonic activity is revealed. Semidiurnal total powers (power elements) are chosen as “operational” objects with the use of which the sought-for interrelation is established. Regressions were obtained separately for each season: the number of elements and their powers are related by a negative power relation. The result obtained is supposed to serve as a certain basis for the probabilistic prediction of cyclonic activity during the season.