Meteorology: Stratospheric planetary waves

The Role of Planetary Waves in the Downward Influence of Stratospheric Final Warming Events

Stratospheric final warming events are simulated in an idealized atmospheric model by imposing a winterto-summer transition in radiative equilibrium temperature only in the stratosphere. Large ensembles of events are simulated with different strengths of topographic forcing. It is found that the dates of final warmings become earlier and their downward influence on the troposphere becomes stron...

A Study of Tracer Transports by Planetary Scale Waves in the Mit Stratospheric General Circulation Model

The quasi-geostrophic global stratospheric model at MIT developed by is used to study the zonal and time-averaged transport of potential temperature and ozone by the planetary zonal wavenumbers 1-6. Several types of covariances between the winds, geopotential, and the tracers are calculated in order to evaluate the directions and strength of the fluxes and the winds causing the fluxes. The eddy...

Observations of planetary waves in the mesosphere-lower thermosphere during stratospheric warming events

This study investigates the effect of stratospheric sudden warmings (SSWs) on planetary wave (PW) activity in the mesosphere–lower thermosphere (MLT). PW activity near 95 km is derived from meteor wind data using a chain of eight SuperDARN radars at high northern latitudes that span longitudes from 150W to 25 E and latitudes from 51 to 66 N. Zonal wave number 1 and 2 components were extracted f...

Impact of Tropical SST on Stratospheric Planetary Waves in the Southern Hemisphere

The impact of tropical sea surface temperature (SST) on stratospheric planetary waves in the Southern Hemisphere (SH) is investigated in austral spring using observed SST and reanalysis data for the past three decades. Maximum covariance analysis indicates that the tropical SST and the SH stratospheric planetary wave activity are primarily coupled through two modes. The leading two modes show t...

Impact of tropical sea surface temperatures on 1 Southern Hemisphere stratospheric planetary 2 waves