## The influence of the stratosphere polar vortex dynamics upon a low troposphere thermal stratification

In this paper, the response of the extratropical troposphere to a decrease in the polar stratosphere temperature, which is followed by strengthening the polar vortex, is studied with the use of the spectral general circulation model with symmetric boundary conditions on the surface and a heat source given analytically.

## Application of a mixed finite element method for solving 2D nonlinear vorticity equation

A new two-step scheme has been obtained as a result of application of the finite element method (FEM) and the splitting up method to the 2D nonlinear vorticity equation. At the first step, the conforming piecewise-linear finite elements are used; at the second step, non-conforming ones are made use of...

## Modeling of methane flows in the atmosphere resulting from seabed fluid discharge

Reservoirs of geological methane can occur within the sediments at any depth, right up to the seabed. Methane is also sequestered by gas hydrates. One mechanism to release methane from sediments to the ocean is through submarine mud volcanism, hydrocarbon seeps and vents. The 3D mathematical model of the dissolved...

## Reconstruction of fields of poly-dispersive impurities falls from high aerosol sources

This paper deals with mathematical models of reconstructing the fields of poly-dispersive impurities falls from instant sources as applied to traces of nuclear explosions and accidents. In approximation of a semi-kinematics model of aerosol impurities sedimentation in the atmosphere, the relations to evaluate the fields of impurity concentrations were obtained...

## Assessment of fields of poly-disperse pollutants concentration in the vicinity of a distributed source

The models of evaluating the mass and countable concentrations fields of aerosol pollutants in the vicinity of a distributed source were developed using a semi-empirical equation of turbulent diffusion in the surface atmospheric layer. With the models proposed, the fieldwork studies of the surface aerosol are numerically interpreted on lake...

## Advantage of using QUICKEST scheme for the approximation of the transport operator in the equations of motion in the ocean circulation model

This paper presents a study aimed at improving numerical models of the ocean dynamics. We evaluate the sensitivity of the regional ocean circulation model to the numerical schemes used to approximate the transport operator in the equations of motion; we investigate the influence of the numerical scheme on the flow...