This theoretical study deals with the static part of the total energy and tends to explore the functional relationship between its changes and atmospheric static stability. It is shown that a dimensionless energy number may be defined in terms of isentropic analysis to be the function of static stability with recognizable physical meaning. Its mathematical properties indicate that this particular dependence may be described by a bilinear fractional function taking a form of an equilateral hyperbola with asymptotes parallel to the coordinate axes. Its unstable branch corresponds to the higher rate of change of static energy and lies in the first quadrant, while in the third one its lower rate is related to the stable branch. Asymptotic solution of considered theoretical problem implies that the transition from stable to unstable branch may appear only by an infinite jump and holds an intriguing resemblance with either the quantum transition between two energy shells by the absorption or emission of energy or the transition from stable to unstable regime of the general atmospheric circulation.
Keywords: Atmospheric static stability, isentropic analysis, static energy
Two cases of the most
severe bora episodes along the Adriatic coast of
Although in both cases the bora onset is caused by a frontal passage, the maximal local speeds occur afterwards and coincide with a pronounced short period pressure perturbation.
Both cases were characterized by the temporal occurrence of the well marked superadiabatic layers in the low troposphere.
The vertical structure
in the March case shows the temperature inversion in
Keywords: Severe Bora events,
A statistical analysis of the correlation between vorticity advection values and grey shade values in infra-red satellite images is presented. Average correlation coefficients for six-month data set in all four chosen levels were found positive. This means that higher vorticity advection values result in brighter grey shades in satellite images. The best correlation was found for vorticity advection in 500 and 300 hPa levels. Absolute values of average coefficients are below 0.2 meaning that correlation is not good in all synoptic situations. The results were significantly improved when only those images were considered in which comma cloud structures, enhanced cumuli clouds or frontal intensifications were found. Statistics for the 16 selected cases indicated satisfactory correlation between vorticity advection and pixel values. This enables forecasting of cloud paths and development by following the vorticity advection maxima related to the mentioned cloud structures.
Keywords: Vorticity advection, infra-red satellite images
The study presents (re)evaluation of
fault-plane solutions for 40 earthquakes that occurred in the period 1956-1995
Keywords: Fault-plane solution, seismicity
We analyzed the NEIC broadband radiated energy catalogue and found that the scaling law of earthquake energy deduced from Gutenegberg-Richter’s law is not valid in a quantitative sense. The analysis of broadband radiated energy, however, also shows a scaling law, which may be represented by a broadband b value.
Keywords: Broadband radiated energy, Gutenegberg-Richter’s law