TY - CONF

T1 - Influence of QBO phases on planetary waves and stratospheric warmings

AU - Koval, A.V.

AU - Gavrilov, N.M.

AU - Pogoreltsev, A.I.

AU - Savenkova, E.N.

PY - 2014

Y1 - 2014

N2 - Spatial distributions of planetary wave amplitudes are calculated for 10-day intervals before, during, and after an SSW event. In this study we analyze stationary planetary wave modes with zonal wave numbers m = 1 - 4 and eastward and westward propagating normal atmospheric modes having m = 1 and m = 2 with periods 5, 10, 16 and 4, 7 days, respectively. Amplitudes of stationary planetary waves for the westward QBO phase increase during the SSW and decrease after the event. For the eastward QBO phase, the amplitudes increase before SSW and decrease during the event in the northern hemisphere. These changes can stimulate corresponding changes in the mean flow and temperature fields forming SSWs in the middle atmosphere.

AB - Spatial distributions of planetary wave amplitudes are calculated for 10-day intervals before, during, and after an SSW event. In this study we analyze stationary planetary wave modes with zonal wave numbers m = 1 - 4 and eastward and westward propagating normal atmospheric modes having m = 1 and m = 2 with periods 5, 10, 16 and 4, 7 days, respectively. Amplitudes of stationary planetary waves for the westward QBO phase increase during the SSW and decrease after the event. For the eastward QBO phase, the amplitudes increase before SSW and decrease during the event in the northern hemisphere. These changes can stimulate corresponding changes in the mean flow and temperature fields forming SSWs in the middle atmosphere.

M3 - Abstract

SP - 0042

T2 - 40th COSPAR Scientific Assembly 2014

Y2 - 2 August 2014 through 10 August 2014

ER -