Dynamics of horizontal buoyant jets

TL;DR

This paper develops a theoretical model for horizontal buoyant jets, analyzing their stationary states and transverse pulsations, and predicts different pulsation periods for warm and cold jets affecting wind-speed spectra.

Contribution

It introduces a single-layer model that describes jet dynamics, including pulsations and their impact on wind spectra, highlighting differences between warm and cold jets.

Findings

Warm jets have longer pulsation periods than inertial oscillations.

Cold jets exhibit shorter pulsation periods.

Warm jets can influence the wind-speed spectrum by generating additional spectral peaks.

Abstract

A single-layer model is used to construct the theory of straight-line jets. In addition to stationary states, the evolution of such jets admits transverse pulsations. The theory predicts that the period for warm jets pulsations is longer than the period of inertial oscillations caused by the Earth's rotation, while for cold jets pulsations, it is shorter. Thus, only warm jets can have a noticeable effect on the synoptic range of the wind-speed spectrum, generating into it additional spectral peaks. Within such an approach, every a single jet is described by a self-similar compactly localized solution that can be considered as a constant-shear band.